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Table S1. Survey of recent (1996 – present) publications exploring positive interactions between vascular plants. The table shows the source publication, the location of the study, the beneficiary and benefactor species, and the type of study: A = correlative evidence, FE = field experiment; M = evidence for mechanism; Lab = primarily laboratory evidence (after Callaway 1995). Within location, “Artificial community” includes those studies that both construct communities or use isolated plants in pots. Within Beneficiary and Benefactor species, “General” indicates a benefit to, or impact from, the surrounding vegetation in general. We have not included modelling studies or review papers within this list, nor those that predominantly examine interactions between bryophytes. Paper Location Beneficiary Benefactor Type of study Barnes, P.W. & Archer, S. (1996) Influence of an overstorey tree (Prosopis glandulosa) on associated shrubs in a savanna parkland: implications for dynamics. Oecologia, 105, 493-500. Savanna grassland, Texas, U.S.A. Shrubs Prosopis glandulosa FE, M Callaway, R.M., DeLucia, E.H., Moore, D., Nowak, R., & Schlesinger, W.H. (1996) Competition and facilitation: contrasting effects of Artemisia tridentata on desert vs. montane pines. Ecology, 77, 2130-2141. Shrub steppe - montane forest ecotone, Great Basin, U.S.A. Pinus monophylla Artemisia tridentata A, FE, M Callaway, R.M. & King, L. (1996) Temperature-driven variation in substrate oxygenation and the balance of competition and facilitation. Ecology, 77, 1189-1195. Pothole Wetlands, Montana, U.S.A. Salix exigua, Myosotis laxa Typha latifolia M, Lab Casper, B.B. (1996) Demographic consequences of drought in the herbaceous perennial Cryptantha flava: effects of density, associations with shrubs, and plant size. Oecologia, 106, 144152. Desert, northeastern Utah, U.S.A. Cryptantha flava Shrubs FE Dawson, T.E. (1996) Determining water use by trees and forests from isotopic, energy balance, and transpiration analyses: the roles of tree size and hydraulic lift. Tree Physiology, 16, 263-272. Abandoned fields, Ithaca, Acer saccharum U.S.A. Acer saccharum FE, M Franco-Pizana, J.G., Fulbright, T.E., Gardiner, D.T., & Tipton, A.R. (1996) Shrub emergence and seedling growth in microenvironment created by Prosopis glandulosa. Journal of Vegetation Science, 7, 257-264. Grassland-woodland transition, southern Texas, U.S.A. Celtis pallida Prosopis glandulosa A, FE, M Greenlee, J.T. & Callaway, R.M. (1996) Abiotic stress and the relative importance of interference and facilitation in montane bunchgrass communities in western Montana. American Naturalist, 148, 386-396. Xeric rocky slopes, western Montana, U.S.A. Lesquerella carinata Bunchgrass spp. A, FE, M Haase, P., Pugnaire, F., Clark, S.C., & Incoll, L.D. (1996) Spatial patterns in a two-tiered semi-arid shrubland in southeastern Spain. Journal of Vegetation Science, 7, 527-534. Semi-arid shrubland, southeastern Spain Shrubs Retama sphaerocarpa A Harley, C.D.G. & Bertness, M.D. (1996) Structural interdependence: an ecological consequence of morphological responses to crowding in marsh plants. Functional Ecology, 10, 654-661. Salt marsh, Rhode Island, U.S.A. Salt marsh plants Salt marsh plants FE, M Hoffmann, W.A. (1996) The effects of fire and cover on seedling establishment in a neotropical savanna. Journal of Ecology, 84, 383-393. Cerrado savanna, Brazil Shrubs, Trees Trees FE, M Humberto, S., Nabhan, G.P., & Patten, D.T. (1996) The importance of Olneya tesota as a nurse plant in the Sonoran Desert. Journal of Vegetation Science, 7, 635-644. Sonoran Desert, Arizona, U.S.A. Lophocereus schottii, perennial plants Olneya tesota A, M Kikvidze, Z. (1996) Neighbour interaction and stability in subalpine meadow communities. Journal of Vegetation Science, 7, 41-44. Subalpine meadow, central Caucasus, Georgia Meadow species Meadow species FE, M Maron, J.L. & Connors, P.G. (1996) A native nitrogen-fixing shrub facilitates weed invasion. Oecologia, 105, 302-312. Coastal prairie, California, U.S.A. Invasive and native grassland species, Bromus dyandrus Lupinus arboreus FE, M, Lab O'Connor, T.G. (1996) Hierarchical control over seedling recruitment of the bunch-grass Themeda triandra in a semiarid savanna. Journal of Applied Ecology, 33, 1094-1106. Semi-arid savanna, eastern Cape, South Africa Themeda triandra General FE, M Pennings, S.C. & Callaway, R.M. (1996) Impact of a native parasitic plant on salt marsh vegetation structure and dynamics. Ecology, 77, 1410-1419. Salt marsh, California, U.S.A. Limonium californicum Cuscuta salina A, FE, M Pugnaire, F.I., Hasse, P., & Puidefabregas, J. (1996a) Facilitation between higher plant species in a semiarid environment. Ecology, 77, 1420-1426. Semi-arid shrubland, southeastern Spain Marrubium vulgare Retama sphaerocarpa A, M Pugnaire, F.I., Haase, P., Puigdefabregas, J., Cueto, M., Incoll, L.D., & Clark, S.C. (1996b) Facilitation and succession under the canopy of Retama sphaerocarpa (L.) Boiss. in a semi-arid environment in South-east Spain. Oikos, 76, 455-464. Semi-arid shrubland, southeastern Spain Herbs Retama sphaerocarpa A, M Turkington, R. & Jolliffe, P.A. (1996) Interference in Trifolium repens-Lolium perenne mixtures: short- and longterm relationships. Journal of Ecology, 84, 563-571. Sown pastures, Gwynedd, north Wales Trifolium repens Lolium perenne FE Verdú, M. & García-Fayos, P. (1996) Nucleation processes in a Mediterranean bird-dispersed plant. Functional Ecology, 10, 275-280. Abandoned orchards, Valencia, eastern Spain Trees, shrubs Pistachia lentiscus A, M Brewer, J.S., Levine, J.M., & Bertness, M.D. (1997) Effects of biomass removal and elevation on species richness in a New England salt marsh. Oikos, 80, 333-341. Salt marsh, New England, U.S.A. General General FE, M Dzwonko, Z. & Loster, S. (1997) Effects of dominant trees and anthropogenic disturbances on species richness and floristic composition of secondary communities in southern Poland. Journal of Applied Ecology, 34, 861-870. Abandoned grasslands, southern Poland Nitrophilous, heathland and woodland species Pinus sylvestris, Robinia pseudacacia A, M Hjalten, J. & Price, P.W. (1997) Can plants gain protection from herbivory herbivory by association with unpalatable neighbors?: a field experiment in a willow-sawfly system. Oikos, 78, 317-322. Riparian willow scrub, Arizona, U.S.A. Salix lasiolepis Salix lasiolepis FE, M Høgh-Jensen, H. & Schjoerring, J.K. (1997) Interactions between white clover and ryegrass under contrasting nitrogen availability: N2 fixation, N fertilizer recovery, N transfer and water use efficiency. Plant and Soil, 197, 187-199. Mixed clover-ryegrass pasture, Denmark Lolium perenne Trifolium repens FE, M Jackson, J.T. & Van Auken, O.W. (1997) Seedling survival, growth and mortality of Juniperus ashei (Cupressaceae) in the Edwards Plateau region of central Texas. Texas Journal of Science, 49, 267-278. Upland savanna, central Texas, U.S.A. Juniperus ashei seedlings Juniperus ashei adults A Martens, S.N., Breshears, D.D., Meyer, C.W., & Barnes, F.J. (1997) Scales of above-ground and below-ground competition in a semi-arid woodland detected from spatial pattern. Journal of Vegetation Science, 8, 655-644. Pinus edulis-Juniperus monosperma woodland, New Mexico, U.S.A. Trees Trees A Moro, M.J., Pugnaire, F.I., Hasse, P., & Puigdefabregas, J. (1997) Mechanisms of interaction between Retama sphaerocarpa and its understory layer in a semi-arid environment. Ecography, 20, 175-184. Semi-arid shrubland, southeastern Spain Understory herbs Retama sphaerocarpa A, FE, M Roll, J., Mitchell, R.J., Cabin, R.J., & Marshall, D.L. (1997) Reproductive success increases with local density of conspecifics in a desert mustard (Lesquerella fendleri). Conservation Biology, 11, 738-746. Range of desert communities, new Mexico, U.S.A. Lesquerella fendleri Lesquerella fendleri A Simard, S.W., Perry, D.S., Jones, M.D., Myrold, D.D., Durall, D.M., & Molina, R. (1997) Net transfer of carbon between ectomycorrhizal tree species in the field. Nature, 388, 579582. Woodland Pseudotsuga menziesii Betula papyrifera FE, M Takahashi, K. (1997) Regeneration and coexistence of two subalpine conifer species in relation to dwarf bamboo in the understory. Journal of Vegetation Science, 8, 529-536. Subalpine forests, northern Japan Picea glehnii, Abies sachalinensis Trees A, M Tielbörger, K. & Kadmon, R. (1997) Relationships between shrubs and annual communities in a sandy desert ecosystem: a three year study. Plant Ecology, 130, 191-201. Desert community, Negev, Israel Annuals Shrubs A Adler, P.B., D'Antonio, C.M., & Tunison, J.T. (1998) Understory successsion following a dieback of Myrica faya in Shrubland, Hawai'i Volcanoes National Park, General Myrica faya A, M Hawai'i Volcanoes National Park. Pacific Science, 52, 69-78. U.S.A. Blennow, K., Lang, A.R.G., Dunne, P., & Ball, M.C. (1998) Cold-induced photoinhibition and growth of snow gum (Eucalyptus pauciflora) under differing temperature and radiation regimes in fragmented forests. Plant, Cell and Environment, 21, 407-416. Fragmented forest tree islands, Namadgi National Park, southeastern Australia Eucalyptus pauciflora Trees FE, M Buckley, D.S., Sharik, T.L., & Isebrands, J.G. (1998) Regeneration of northern red oak: positive and negative effects of competitor removal. Ecology, 79, 65-78. Woodlands (natural and planted), Lower Michigan, U.S.A. Quercus rubra Trees FE, M Caccia, F.D. & Ballare, C.L. (1998) Effects of tree cover, understory vegetation, and litter on regeneration of Douglas-fir (Pseudotsuga menziesii) in southwestern Argentina. Canadian Journal of Forest Research, 28, 683-692. Woodlands, southwestern Argentina Pseudotsuga menziesii Trees A, FE, M Callaway, R.M. (1998) Competition and facilitation on elevation gradients in subalpine forests of the northern Rocky Mountains, USA. Oikos, 82, 561-573. Subalpine forests, northern Rocky Mountains, U.S.A. Abies lasiocarpa Pinus albicaulis A, M Callaway, R.M. & Davis, F.W. (1998) Recruitment of Quercus Woodland, sage scrub, agrifolia in central California: the importance of shrubgrassland, chaparral, dominated patches. Journal of Vegetation Science, 9, 647-656. California, U.S.A. Quercus agrifolia Shrubs A Cavieres, L.A., Penaloza, A., Papic, C., & Tambutti, M. (1998) Nurse effect of Laretia acaulis (Umbelliferae) in the high Andes of central Chile. Revista Chilena de Historia Natural, 71, 331-341. High altitude alpine system, high Andes, Chile General Laretia acaulis A, M Fischer, M. & Matthies, D. (1998) Effects of population size on performance in the rare plant Gentianella germanica. Journal of Ecology, 86, 195-204. Calcareous grassland, Jura Mountains, Switzerland/Germany Gentianella germanica Gentianella germanica A, M, Lab Ghazoul, J., Liston, K.A., & Boyle, T.J.B. (1998) Disturbanceinduced density-dependent seed set in Shorea siamensis (Dipterocarpaceae), a tropical forest tree. Journal of Ecology, 86, 462-473. Tropical forest, western Thailand Shorea siamensis Shorea siamensis A, FE, M Godinez-Alvarez, H., Valiente-Banuet, A., & Banuet, L.V. (1998) Biotic interactions and the population dynamics of the long-lived columnar cactus, Neobuxbaumia tetetzo in the Tehuacan Valley, Mexico. Canadian Journal Botany, 77, 203208. Tetechera, Tehuacan Valley, Mexico Neobuxbaumia tetetzo Mimosa luisiana, Trees, Shrubs A, FE Groom, M.J. (1998) Allee effects limit population viability of an annual plant. American Naturalist, 151, 487-496. Roadside vegetation, California, U.S.A. Clarkia concinna Clarkia concinna A, M Hietz, P. & Briones, O. (1998) Correlation between water relations and within-canopy distribution of epiphytic ferns in a Mexican cloud forest. Oecologia, 114, 305-316. Cloud forest, Mexico Ferns Trees A, M Jumpponen, A., Mattson, K., Trappe, J.M., & Ohtonen, R. (1998) Effects of established willows on primary succession on Lyman Glacier forefront, North Cascade Range, Washington, U.S.A.: evidence for simultaneous canopy inhibition and soil facilitation. Arctic and Alpine Research, 30, 31-39. Glacier foreground, North Cascade Range, Washington, U.S.A. Pinus contorta Salix commutata, Salix phylicifolia A, FE, M Jurena, P.N. & Van Auken, O.W. (1998) Woody plant recruitment under canopies of two Acacias in a southwestern Texas grassland. Southwestern Naturalist, 43, 195-203. Shrubland, southwestern Texas, U.S.A., and northern Mexico Woody and succulent species Acacia rigidula A, M Levine, J.M., Hacker, S.D., Christopher, H.D.G., & Bertness, M.D. (1998) Nitrogen effects on an interaction chain in a salt marsh community. Oecologia, 117, 266-272. Salt marsh, New England, U.S.A. Iva frutescens Juncus gerardi FE, M Li, X. & Wilson, S.D. (1998) Facilitation among woody plants establishing in an old field. Ecology, 79, 2694-2705. Grasslands Symphoricarpos occidentalis, Picea Symphoricarpos occidentalis, Picea glauca FE, M glauca Man, R. & Lieffers, V.J. (1998) Seasonal photosynthetic responses to light and temperature in white spruce (Picea glauca) seedlings planted under an aspen (Populus tremuloides) canopy and in the open. Tree Physiology, 17, 437-444. Populus woodlands and clearings, near Edmonton, Canada Picea glauca Clarkia concinna FE, M Meiners, S.J. & Gorchov, D.L. (1998) Effects of distance to Juniperus virginiana on the establishment of Fraxinus and Acer seedlings in old fields. American Midland Naturalist, 139, 353-364. Old fields, Ohio, U.S.A. Acer saccharum, Fraxinus americana Juniperus virginiana A, FE, M Menges, E.S. & Dolan, R.W. (1998) Demographic viability of populations of Silene regia in midwestern prairies: relationships with fire management, genetic variation, geographic location, population size and isolation. Journal of Ecology, 86, 63-78. Prairie, various states, U.S.A. Silene regia Silene regia A Miller, E.A. & Halpern, C.B. (1998) Effects of environment and grazing disturbance on tree establishment in meadows of the central Cascade Range, Oregon, USA. Journal of Vegetation Sciences, 9, 265-282. Meadows, Oregon, U.S.A. Invasive trees Trees A O'Connell, L.M. & Johnston, M.O. (1998) Male and female pollination success in a deceptive orchid, a selection study. Ecology, 79, 1246-1260. Heaths, Nova Scotia Cypripedium acaule Cypripedium acaule, Ericaceous shrubs A, FE, M Pickart, A.J., Miller, L.M., & Duebendorfer, T.E. (1998) Yellow bush lupine invasion in northern California coastal dunes. I. Ecological impacts and manual restoration techniques. Restoration Ecology, 6, 59-68. Coastal dunes, California, U.S.A. Lupinus arboreus, Non-native grasses Lupinus arboreus FE, M Quinos, P.M., Insausti, P., & Soriano, A. (1998) Facilitative effect of Lotus tenuis on Paspalum dilatatum in a lowland grassland of Argentina. Oecologia, 114, 427-431. Lowland grassland, Argentina Paspalum dilatatum Lotus tenuis FE, M Raffaele, E. & Veblen, T.T. (1998) Facilitation by nurse shrubs of resprouting behavior in a post-fire shrubland in northern Patagonia, Argentina. Journal of Vegetation Science, 9, 693-698. Post-fire shrubland, northern Patagonia, Argentina Herbs, Wood plants Schinus patagonicus, Berberis buxifolia FE, M Sans, F.X., Escarre, J., Gorse, V., & Lepart, J. (1998) Persistence of Picris hieracioides populations in old fields: an example of facilitation. Oikos, 83, 283-292. Vineyards, Montpellier, France Picris hieracioides General FE, M Tewksbury, J.J., Nabhan, G.P., Norman, D., Suzan, H., Tuxhill, J., & Donovan, J. (1998) In situ conservation of wild chillies and their biotic associates. Conservation Biology, 13, 1-10. Desert, Arizona, U.S.A. Wild chillies Fleshy-fruited shrubs A, M Thomas, B.D. & Bowman, W.D. (1998) Influence of N2fixing Trifolium on plant species composition and biomass production in alpine tundra. Oecologia, 115, 26-31. Dry meadow alpine tundra, Colorado, U.S.A. General Trifolium dasyphyllum A, M Wied, A. & Galen, C. (1998) Plant parental care: conspecific nurse effects in Frasera speciosa and Cirsium scopulorum. Ecology, 79, 1657-1668. Alpine meadow, Colorado, U.S.A. Frasera speciosa, Cirsium scopulorum Frasera speciosa, Cirsium scopulorum A, FE, M Barnes, P.W. & Archer, S. (1999) Tree-shrub interactions in a subtropical savanna parkland: competition or facilitation? Journal of Vegetation Science, 10, 525-536. Grasslands and savannas, southern Texas, U.S.A. Zanthoxylum fagara, Berberis trifoliolata Prospois glandulosa FE, M Camarero, J.J. & Gutiérrez, E. (1999) Structure and recent recruitment at alpine forest-pasture ecotones in the Spanish central Pyrenees. Ecoscience, 6, 451-464. Forest-pasture ecotones, Central Pyrenees, Spain Pinus uncinata Krummholz vegetation A Carrillo-Garcia, A., de la Luz, J.L.L., Bashan, Y., & Bethlenfalvay, G.J. (1999) Nurse plants, mycorrhizae, and plant establishment in a disturbed area of the Sonoran Desert. Restoration Ecology, 4, 321-335. Sonoran Desert, Baja California Sur, Mexico Cacti, Trees, Shrubs Prosopis articulata, Olneya tesota A Chapman, A.S. & Chapman, A.R.O. (1999) Effects of cordgrass on saltmarsh fucoids: reduced desiccation and light availability, but no changes in biomass. Journal Experimental Marine Biology, 238, 69-91. Salt marsh, eastern Canada Fucoid mats Spartina alterniflora A, M Dunne, J.A. & Parker, V.T. (1999) Species-mediated soil moisture availability and patchy establishment of Pseudotsuga menziesii in chaparral. Oecologia, 119, 36-45. Chaparral - forest ecotone, California, U.S.A. Pseudotsuga menziesii Arctostaphylos montana, A. glandulosa FE, M Dupraz, C., Simorte, V., Dauzat, M., Bertoni, G., Bernadac, A., & Masson, P. (1999) Growth and nitrogen status of young walnuts as affected by intercropped legumes in a Mediterranean climate. Agroforestry Systems, 43, 71-80. Agricultural systems, Montpellier, France Juglans nigra Medicago sativa, Onobrychis sativa FE, M Eccles, N.S., Esler, K.J., & Cowling, R.M. (1999) Spatial pattern analysis in Namaqualand desert plant communities: evidence for general positive interactions. Plant Ecology, 142, 71-85. Desert communities, Namaqualand, South Africa General General A Fike, J. & Niering, W.A. (1999) Four decades of old field vegetation development and the role of Celastrus orbiculatus in the northeastern United States. Journal of Vegetation Science, 10, 483-492. Post-agricultural site, southern New England, U.S.A. Vitis labrusca Celastrus orbiculatus A Gerard, V.A. (1999) Positive interactions between cordgrass, Spartina alterniflora, and the brown alga, Ascophyllum nodosum ecad scorpioides, in a mid-Atlantic coast salt marsh. Journal Experimental Marine Biology, 239, 157-164. Salt marsh, Long Island, U.S.A. Spartina alterniflora, Ascophyllum nodosum ecad scorpioides Spartina alterniflora, Ascophyllum nodosum ecad scorpioides FE, M Hacker, S.D. & Bertness, M.D. (1999) Experimental evidence for factors maintaining plant species diversity in a New England salt marsh. Ecology, 80, 2064-2073. Salt marsh, New England, U.S.A. Atriplex patula, Iva frutescens, Limonium nashii, Solidago sempervirens Juncus gerardi FE, M Holzapfel, C. & Mahall, B.E. (1999) Bi-directional facilitation and interference between shrubs and associated annuals in the Mojave Desert. Ecology, 80, 1747-1761. Mojave desert, California, U.S.A. Annuals Ambrosia dumosa FE, M Horton, T.R., Bruns, T., & Parker, V.T. (1999) Ectomycorrhizal fungi in Arctostaphylos patches contribute to the establishment of Pseudotsuga menziesii. Canadian Journal of Botany, 77, 93-102. Chaparral - forest ecotone, California, U.S.A. Pseudotsuga menziesii Arctostaphylos montana, A. glandulosa FE, M Levine, J.M. (1999) Indirect facilitation: evidence and predictions from a riparian community. Ecology, 80, 17621769. Riparian system, northern California, U.S.A. General Carex nudata FE, M Maron, J.L. & Jefferies, R.L. (1999) Bush lupine mortality, altered resource availability, and alternative vegetation states. Ecology, 80, 443-454. Coastal prairie, California, U.S.A. Invasive grasses Lupinus arboreus FE, M Nunez, C.L., Aizen, M.A., & Ezcurra, C. (1999) Species associations and nurse plant effect in patches of high-Andean vegetation. Journal of Vegetation Science, 10, 357-364. High-elevation communities, southern Andes, Argentina General Mulinum leptacanthum, Oreopolus glacialis, cushions A Rousset, O. & Lepart, J. (1999) Shrub facilitation of Quercus humilis regeneration in succession on calcareous grasslands. Journal of Vegetation Science, 10, 493-502. Calcareous grassland, southern France Quercus humilis Buxus sempervirens, Juniperus communis A, M Suding, K.N. & Goldberg, D.E. (1999) Variation in the effects of vegetation and litter on recruitment across productivity gradients. Journal of Ecology, 87, 436-449. Sand barrens, prairies, fens, southeastern Michigan & northern Ohio, U.S.A. General Vegetation and litter FE, M Toh, I., Gillespie, M., & Lamb, D. (1999) The role of isolated trees in facilitating tree seedling recruitment at a degraded subtropical rainforest site. Restoration Ecology, 7, 228-237. Abandoned farmland, southern Queensland, Australia Trees Trees A, M Vlok, J.H.J. & Yeaton, R.I. (1999) The effect of overstorey proteas on plant species richness in South African mountain fynbos. Diversity and Distributions, 5, 213-222. Mountain fynbos, western Cape, South Africa General Protea spp. A, M Walker, L.R. & Powell, E.A. (1999) Regeneration of the Mauna Kea silversword Argyroxiphium sandwicense (Asteraceae) in Hawaii. Biological Conservation, 89, 61-70. High elevation cinder deserts, Mauna Kea, Hawaii, U.S.A. Argyroxiphium sandwicense Trees, Shrubs A Weltzin, J.F. & McPherson, G.R. (1999) Facilitation of conspecific seedling recruitment and shifts in temperate savanna ecotones. Ecological Monographs, 69, 513-534. Savannas and grasslands, southwestern U.S.A. and northwestern Mexico Quercus emoryi seedlings Quercus emoryi trees A, FE, M Zahawi, R.A. & Augspurger, C.K. (1999) Early plant succession in abandoned pastures in Ecuador. Biotropica, 31, 540-552. Abandoned pastures, northwestern Ecuador General, trees Psidium guajava FE, M Bruno, J.F. (2000) Facilitation of cobble beach communities Cobble beach, New through habitat modification by Spartina alterniflora. Ecology, England, U.S.A. 81, 1179-1192. General Spartina alterniflora A, FE, M Bruno, J.F. & Kennedy, C.W. (2000) Patch-size dependent habitat modification and facilitation on New England cobble beaches by Spartina alterniflora. Oecologia, 122, 98-108. Cobble beach, New England, U.S.A. Suaeda linearis, Salicornia europaea, general Spartina alterniflora A, FE, M Callaway, R.M., Kikodze, D., & Kikvidze, Z. (2000) Facilitation by unpalatable weeds may conserve plant diversity in overgrazed meadows in the Caucasus Mountains. Oikos, 89, 275-282. Subalpine meadow, central Caucasus, Georgia General Cirsium obvalatum, Veratrum lobelianum A, M Callaway, R.M. & Pennings, S.C. (2000) Facilitation may buffer competitive effects: indirect and diffuse interactions among salt marsh plants. American Naturalist, 156, 416-424. Salt marsh, central California, U.S.A. Winter annuals, Limonium californicum Arthrocnemum subterminale FE, M Carrillo-Garcia, A., Bashan, Y., & Bethlenfalvay, G.J. (2000a) Resource-island soils and the survival of the giant cactus, cardon, of Baja California Sur. Plant and Soil, 218, 207-214. Sonoran Desert, Baja California Sur, Mexico and Greenhouse Pachycereus pringlei Prosopis articulata M, Lab Carrillo-García, A., Bashan, Y., Rivera, E.D., & Sonoran Desert, Baja Bethlenfalvay, G.J. (2000b) Effects of resource-island soils, California Sur, Mexico competition, and inoculation with Azospirillum on survival and and Greenhouse growth of Pachycereus pringlei, the Giant Cactus of the Sonoran Desert. Restoration Ecology, 8, 65-73. Pachycereus pringlei Prosopis articulata, Olnea testosa M.Lab Couteron, P., Mahamane, A., Ouedraogo, P., & Seghieri, J. (2000) Differences between banded thickets (tiger bush) at two sites in West Africa. Journal of Vegetation Science, 11, 321328. Banded thicket scrub, West Africa Seedlings Shrubs A Dolch, R. & Tscharntke, T. (2000) Defoliation of alders (Alnus glutinosa) affects herbivory by leaf beetles on undamaged neighbours. Oecologia, 125, 504-511. Experimental stands Alnus glutinosa Alnus glutinosa M, Lab Facelli, J.M. & Brock, D.J. (2000) Patch dynamics in arid lands: localized effects of Acacia papyrocarrpa on soils and vegetation of open woodlands of South Australia. Ecography, 23, 479-491. Arid systems, south Australia Enchylaena tomentosa Acacia papyrocarpa A, M, Lab Fischer, M., van Kluenen, M., & Schmid, B. (2000) Genetic allee effects on performance, plasticity, and genetic stability in a clonal plant. Ecology Letters, 3, 530-539. Sandy gravel shore, European lake Ranunculus reptans Ranunculus reptans A, M, Lab Gerdol, R., Brancaleoni, L., Menghini, M., & Marchesini, R. (2000) Response of dwarf shrubs to neighbor removal and nutrient addition and their influence on community structure in Subalpine heathland, northern Apennines, Italy Empetrum hermaphroditum Vaccinium uliginosum FE a subalpine heath. Journal of Ecology, 88, 256-266. Hambäck, P.A., Agren, J., & Ericson, L. (2000) Associational resistance: insect damage to purple loosestrife reduced in thickets of sweet gale. Ecology, 81, 1784-1794. Shrub heaths, northern Sweden Lythrum salicaria Myrica gale A, FE, M Hoffmann, W.A. (2000) Post-establishment seedlings success in the Brazilian Cerrado: a comparison of savanna and forest species. Biotropica, 32, 62-69. Savanna and forests, Brazil Trees Trees A Holmgren, M., Segura, A.M., & Fuentes, E.R. (2000) Limiting mechanisms in the regeneration of Chilean matorral. Plant Ecology, 147, 49-57. Matorral, Chile Quillaja saponaria seedlings Shrubs A Jordano, P. & Schupp, E.W. (2000) Seed disperser effectiveness: the quantity component and patterns of seed rain for Prunus mahaleb. Ecological Monographs, 70, 591-615. Mediterranean montane scrub, Jaen province, southeastern Spain Prunus mahaleb Trees, Shrubs A, M Karban, R., Baldwin, I.T., Baxter, K.J., Laue, G., & Felton, G.W. (2000) Communication between plants: induced resistance in wild tobacco plants following clipping of neighboring sagebrush. Oecologia, 125, 66-71. Sagebrush scrub, California, U.S.A. Nicotiana attenuata Artemisia tridentata FE, M Kery, M., Matthies, D., & Spillman, H. (2000) Reduced fecundity and offspring performance in small populations of the declining grassland plants Primula veris and Gentiana lutea. Journal of Ecology, 88, 17-30. Artificial communities Primula veris, Gentiana lutea Primula veris, Gentiana lutea M, Lab Kitzberger, T., Steinaker, D.F., & Veblen, T.T. (2000) Effects of climatic variability on facilitation of tree establishment in northern Patagonia. Ecology, 81, 1914-1924. Forest-steppe ecotone, northern Patagonia, Argentina Austrocedrus chilensis Shrubs A, FE, M Kruess, A. & Tscharntke, T. (2000) Species richness and parasitism in a fragmented landscape: experiments and field studies with insects on Vicia sepium. Oecologia, 122, 129-137. Meadows, Kraichgau, southwestern Germany Vicia sepium Vicia sepium A, FE, M Levine, J.M. (2000) Complex interactions in a streamside plant community. Ecology, 81, 3431-3444. Streamside community, northern California, U.S.A. Mimulus guttatus, Mimulus cardinalis, Juncus covillei, Epipactis gigantea, Conocephalum conicum, Brachythecium frigidum Carex nudata FE, M Lookingbill, T.R. & Zavala, M.A. (2000) Spatial pattern of Quercus ilex and Quercus pubescens recruitment in Pinus halepensis dominated woodlands. Journal of Vegetation Science, 11, 607-612. Mediterranean abandoned farmland, eastern Catalonia, Spain Quecus ilex, Quercus pubescens Pinus halepensis A Pugnaire, F.I. & Lazaro, R. (2000) Seed bank and understorey species composition in a semi-arid environment: the effect of shrub age and rainfall. Annals of Botany, 86, 807-813. Semi-arid shrubland, southeastern Spain General Retama sphaerocarpa A Rebele, F. (2000) Competition and coexistence of rhizomatous perennial plants along a nutrient gradient. Plant Ecology, 147, 77-94. Artificial communities Calamagrostis epigejos, Solidago canadensis, Tanacetum vulgare Calamagrostis epigejos, Solidago canadensis, Tanacetum vulgare M, Lab Rousset, O. & Lepart, J. (2000) Positive and negative interactions at different life stages of a colonizing species (Quercus humilis). Journal of Ecology, 88, 401-412. Grassland, Causse du Larzac plateau, southern France Quercus humilis Buxus sempervirens, Juniperus communis A, FE, M Shumway, S.W. (2000) Facilitative interactions between a sand dune shrub and species growing beneath the shrub canopy. Oecologia, 124, 138-148. Sand dunes, Masachusetts, U.S.A. Solidago sempervirens, Ammophila breviligulata Myrica pensylvanica A, FE, M Thomas, F.I.M., Cornelisen, C.D., & Zande, J.M. (2000) Effects of water velocity and canopy morphology on ammonium uptake by seagrass communities. Ecology, 81, 2704-2713. Artificial communities Halodule wrightii, Thalassia testudinum Halodule wrightii, Thalassia testudinum M, Lab Tielbörger, K. & Kadmon, R. (2000) Temporal environmental variation tips the balance between facilitation and interference in desert plants. Ecology, 81, 1544-1553. Desert community, western Negev, Israel General Shrubs A Tuittila, E.-S., Rita, H., Vasander, H., & Laine, J. (2000) Vegetation patterns around Eriophorum vaginatum L. tussocks in a cut-away peatland in southern Finland. Canadian Journal of Botany, 78, 47-58. Cut-away peatland, southern Finland General Eriophorum vaginatum A Anderson, L.J., Brumbaugh, M.S., & Jackson, R.B. (2001) Water and tree-understory interactions: a natural experiment in a savanna with oak wilt. Ecology, 82, 33-49. Savanna grassland, Texas, U.S.A. Prosopis glandulosa Quercus fusiforme FE Bellingham, P.J., Walker, L.R., & Wardle, D.A. (2001) Differential facilitation by a nitrogen-fixing shrub during primary succession influences relative performance of canopy tree species. Journal of Ecology, 89, 861-875. Artificial communities Griselinia littoralis, Metrosideros umbellata, Weinmannia racemosa Carmichaelia odorata Lab Callaway, R.M., Newingham, B., Zabinski, C.A., & Mahall, B.E. (2001) Compensatory growth and competitive ability of and invasive weed are enhanced by soil fungi and native neighbors. Ecology Letters, 4, 1-5. Artificial communities Centaurea maculosa Nasella pulchra Lab, M Callaway, R., M., Reinhart, K.O., S.C., T., & Pennings, S.C. (2001) Effects of epiphytic lichens on host preference of the vascular epiphyte Tillandsia usneoides. Oikos, 94, 433-441. Forest, Sapelo Island, Georgia, U.S.A. Tillandsia usneoides General (lichens) FE, Lab Choler, P., Michalet, R., & Callaway, R.M. (2001) Facilitation and competition on gradients in alpine plant communities. Ecology, 82, 3295-3308. Alpine grassland, Grenoble, France Alchemilla vulgaris Geum montanum Lotus corniculatus Polygonum viviparum Agrostis alpina Helianthemum nummularium Androsace vitaliana Geum montanum Veronica allionii Alchemilla hybrida Leucanthemum adustum Phyteuma orbiculare Geum montanum Poa alpina Ranunculus kuepferi Sibbaldia procumbens Oxytropis helvetica Petrocallis pyrenaica Phyteuma pedemontana General FE de Viana, M.L., Sühring, S., & Manly, B.F.J. (2001) Application of randomization methods to study the association of Trichocereus pasacana (Cactaceae) with potential nurse plants. Plant Ecology, 156, 193-197. Semi-arid shrubland, Salta province, Argentina Trichocereus pasacana General A Goldberg, D.E., Turkington, R., Olsvig-Whittaker, L., & Dyer, A.R. (2001) Density dependence in an annual plant community: variation among life history stages. Ecology, 71, 423-446. Artificial communities General General Lab Ibáñez, I. & Schupp, E.W. (2001) Positive and negative interactions between environmental conditions affecting Cercocarpus ledifolius seedling survival. Oecologia, 129, 543550. Forest, northeastern Utah, U.S.A. Cercocarpus ledifolius, Artemisia tridentata Cercocarpus ledifolius FE Jackson, J. & Ash, A.J. (2001) The role of trees in enhancing soil nutrient availability for native perennial grasses in open Eucalypt woodlands of north-east Queensland. Australian Journal of Agricultural Research, 52, 377-386. Artificial communities Eucalyptus spp. Chrysopogon fallax,Heteropogon contortus Lab, M Maestre, F.T., Bautista, S., Cortina, J., & Bellot, J. (2001) Potential of using facilitation by grasses to establish shrubs on a semiarid degraded steppe. Ecological Applications, 11, 1641–1655. Semi-arid steppes, Alicante province, Spain Pistacia lentiscus, Medicago arborea, Quercus coccifera Stipa tenacissima FE, M Pugnaire, F.I. & Luque, M.T. (2001) Changes in plant interactions along a gradient of environmental stress. Oikos, 93, 42-49. Semi-arid shrubland, Almeria province, Spain Artemisia barrelieri, General Retama sphaerocarpa FE, M Rubio-Casal, A.E., Castillo, J.M., Luque, C.J., & Figueroa, Salt marshes, Huelva M.E. (2001) Nucleation and facilitation in salt pans in province, Spain Mediterranean salt marshes. Journal of Vegetation Science, 12, 761-770. Salicornia ramosissima Arthrocnemum macrostachyum FE Slocum, M. (2001) How tree species differ as recruitment foci in a tropical pasture. Ecology, 82, 2547-2559. Tropical wet forest, Costa Rica Cordia alliodora, Cecropia spp., Ficus spp., Pentaclethra macroloba General FE Tewksbury, J.J. & Lloyd, J.D. (2001) Positive interactions under nurse-plants: spatial scale, stress gradients and benefactor size. Oecologia, 127, 425-434. Desert shrubland, Sonora, Mexico Olneya tesota General FE Walker, L.R., Thompson, D.B., & Landau, F.H. (2001) Experimental manipulations of fertile islands and nurse plant effects in the Mojave Desert, USA. Western North American Naturalist, 61, 25-35. Mojave Desert, Nevada, U.S.A. Ambrosia dumosa Coleogyne ramosissima, Andrea dumosa, Larrea tridentata FE, M Bertness, M.D. & Ewanchuk, P.J. (2002) Latitudinal and climate-driven variation in the strength and nature of biological interactions in New England salt marshes. Oecologia, 132, 392-401. Salt marshes, Maine and Rhode Island, U.S.A. Spartina alterniflora, Spartina patens, Distichlis spicata, Juncus gerardi, Salicornia europaea, Atriplex patula, Solidago sempervirens, L. nashii, Iva frutescens. General FE, M Callaway, R.M., Brooker, R.W., P‡, C., Kikvidze, Z., Lortie, C.J., Michalet, R., Paolini, L., Pugnaire, F.I., Cook, B.J., Aschehoug, E.T., Armas, C., & Newingham, B. (2002) Positive interactions among alpine plants increases with stress: a global experiment. Nature, 417, 844-848. Alpine shrublands and grasslands of Canada, Spain, Scotland, Argentina, Italy, France, U.S.A., Georgia and Sweden General General FE Carino, D.A. & Daehler, C.C. (2002) Can inconspicuous legumes facilitate alien grass invasions? Partridge peas and fountain grass in Hawai'i. Ecography, 25, 33-41. Artificial communities Chamaecrista nictitans Pennisetum setaceum Lab, M Castro, J., R. Zamora, J.A. Hodar and J.M. Gomez (2002) Use of shrubs as nurse plants: a new technique for reforestation in Mediterranean mountains. Restoration Ecology, 10, 297-305. Alpine shrubland, Granada province, Spain Salvia oxyodon, Prunus ramburii, Crataegus granatensis Pinus sylvestris, Pinus nigra FE Cavieres, L.A., Arroyo, M.T.K., Penaloza, A., MolinaMontenegro, M., & C., T. (2002) Nurse effect of Bolax gummifera cushion plants in the alpine vegetation of the Chilean Patagonian Andes. Journal of Vegetation Science, 13, 547-554. Alpine shrubland, Patagonian Andes, Chile Bolax gummifera general FE, M Dormann, C.F. & Brooker, R.W. (2002) Facilitation and competition in the high Arctic: the importance of the experimental approach. Acta Oecologia, 23, 297-301. Artic heath, Svalbard, Sweden Luzula confusa,Salix polaris Luzula confusa,Salix polaris FE El-Bana, M.I., Nijs, I., & Kockelbergh, F. (2002) Microenvironmental and vegetational heterogeneity induced by phytogenic nebkhas in an arid coastal ecosystem. Plant and Soil, 247, 283-293. Desert shrubland, Sinai Peninsula, Egypt Retama raetam General FE, M Espinar, J.L., García, L.V., García Murillo, P., & Toja, J. (2002) Submerged macrophyte zonation in a Mediterranean salt marsh: a facilitation effect from established helophytes? Journal of Vegetation Science, 13, 831-840. Salt marshes, Huelva province, Spain Chara galioides, C. aspera, C. canescens, C. connivens, Nitella hyalina, Ranunculus peltatus, Damasomium alisma, Callitriche truncata, Ruppia drepanensis, Zannichellia obtusifolia Arthrocnemum macrostachyum, Juncus subulatus, Scirpus maritimus, Scirpus litoralis FE, M Facelli, J. & Temby, A.M. (2002) Multiple effects of shrubs control the distribution and performance of annual plants in arid lands of South Australia. Austral Ecology, 27, 422-432. Open woodland, Whyalla, Australia Atriplex vesicaria, Maireana sedifolia General FE, M Foster, B.L. (2002) Competition, facilitation, and the distribution of Schizachryium scoparium along a topographicproductivity gradient. Ecoscience, 9, 355-363. Grassland, Kansas, U.S.A. Schizachyrium scopartum General FE Franks, S.J. & Peterson, C.J. (2002) Burial disturbance leads to facilitation among coastal dune plants. Plant Ecology, 168, 13-21. Coastal dunes, Florida U.S.A. General General FE Germino, M.J., Smith, W.K., & Resor, C. (2002) Conifer seedling distribution and survival in an alpine-treeline ecotone. Alpine-treeline ecotone, Wyoming, U.S.A. Picea engelmannii General A, FE, M Plant Ecology, 162, 157-168. Ibáñez, I. & Schupp, E.W. (2002) Effects of litter, soil surface conditions, and microhabitat on Cercocarpus ledifolius Nutt. seedling emergence and establishment. Journal of Arid Environments, 52, 209-221. Forest, northeastern Utah, U.S.A. Cercocarpus ledifolius, Artemisia tridentata Cercocarpus ledifolius FE Joy, D.A. & Young, D.R. (2002) Promotion of midsuccessional seedling recruitment and establishment by Juniperus virginiana in a coastal environment. Plant Ecology, 160, 125-135. Coastal shrubland, Virginia, U.S.A. Prunus serotina, Sassafras albidum Juniperus virginiana FE, M Lortie, C.J. & Turkington, R. (2002) The facilitative effects of seeds and seedlings on emergence from the seed bank of a desert annual plant community. Ecoscience, 9, 106-111. Artificial communities Erodium laciniatum, Erucaria pinnata General Lab Maestre, F.T., Bautista, S., Cortina, J., Díaz, G., Honrubia, M. & Vallejo, V.R. 2002. Microsite and mycorrhizal inoculum effects on the establishment of Quercus coccifera in a semiarid degraded steppe. Ecological Engineering, 19, 289-295. Semi-arid steppes, Alicante province, Spain Quercus coccifera Stipa tenacissima FE Michalet, R., Rolland, C., Joud, D., Gafta, D., & Callaway, R.M. (2002) Spatial associations between canopy and understory species increase along a rainshadow gradient in the Alps. Plant Ecology, 165, 145-160. Forests, European Alps General General A Pusenius, J. & Ostfeld, R.S. (2002) Mammalian predator scent, Grassland, New York, vegetation cover and tree seedling predation by meadow voles. U.S.A. Ecography, 25, 481-487. Acer rubrum Cornus racemosa FE Rigg, L.S., Enright, N.J., Perry, G.L.W., & Miller, B.P. (2002) The role of cloud combing and shading by isolated trees in the succession from maquis to rain forest in New Caledonia. Biotropica, 34, 199-210. General Araucaria laubenfelsii FE, M Montane shrublandmaquis, New Caledonia Rousset, O. & Lepart, J. (2002) Neighbourhood effects on the risk of an unpalatable plant being grazed. Plant Ecology, 165, 197-206. Forest, France Buxus sempervirens Aphyllanthes monspeliensis, Bromus erectus, Carex humilis, Festuca christianiibernardii, Stipa pennata, Brachypodium pinnatum, Prunus spinosa FE, M Sans, F.X., Escarré, J., Lepart, J., & Hopkins, F. (2002) Positive vs. negative interactions in Picris hieracioides L., a mid-successional species of Mediterranean secondary succession. Plant Ecology, 162, 109-122. Old field, Montpellier, France Picris hieracioides General FE, M Schenk, H.J. & Mahall, B.E. (2002) Positive and negative plant interactions contribute to a north-south-patterned association between two desert shrub species. Oecologia, 132, 402-410. Mojave Desert, California, U.S.A. Ambrosia dumosa, Acamptopappus sphaerocephalus Ambrosia dumosa, Acamptopappus sphaerocephalus A Toft, C. & Elliott-Fisk, D. (2002) Patterns of vegetation along a spatiotemporal gradient on shoreline strands of a desert basin lake. Plant Ecology, 158, 21-39. Sand dunes, California, U.S.A. General General A Totland, Ø. & Esaete, J. (2002) Effects of willow canopies on plant species performance in a low-alpine community. Plant Ecology, 161, 157-166. Alpine grassland, Norway Salix lapponum General FE Arroyo, M.T.K., Cavieres, L.A., Peñaloza, A., & ArroyoKalin, M.A. (2003) Positive associations between the cushion plant Azorella monantha (Apiaceae) and alpine plant species in the Chilean Patagonian Andes. Plant Ecology, 169, 12-129. Alpine communities, Patagonian Andes, Chile General Azorella monantha A, M Christie, D.A. & Armesto, J.J. (2003) Regeneration microsites and tree species coexistence in temperate rain forests of Chiloé Island, Chile. Journal of Ecology, 91, 776-784. Temperate rain forest, Chiloé Island, Chile Trees Trees (fallen logs) A Figeroa, M.E., Castillo, J.M., Redondo, S., Luque, T., Castellanos, E.M., Nieva, F.J., Luque, C.J., Rubio-Casal, A.E., & Davy, A.J. (2003) Facilitated invasion by hybridization of Sarcocornia species in a salt-marsh succession. Journal of Ecology, 91, 616-626. Salt marsh, Atlantic coast, southwest Spain Sarcocornia perennis Spartina maritima A, M García, D. & Obeso, J.R. (2003) Facilitation by herbivoremediated nurse plants in a threatened tree, Taxus baccata: local effects and landscape level consistency. Ecography, 26, 739-748. Cantabrian range (NW Spain) Taxus baccata Ilex aquifolium A, M Hambäck, P.A., Pettersson, J., & Ericson, L. (2003) Are associational refuges species-specific? Functional Ecology, 17, 87-93. Rocky shoreline communities, Umea and Uppland, Sweden, Artificial communities Lythrum salicaria Galerucella calmariensis, G.pusilla, Nanophyes marmoratus FE, M, Lab Johnson, S.D., Peter, C.I., Nilsson, L.A., & Agren, J. (2003) Pollination success in a deceptive orchid is enhance by cooccurring rewarding magnet plants. Ecology, 84, 2919-2927. Grazed meadows, Olands Skogsby, Sweden Anacamptis morio Geum rivale, Allium schoenoprasum FE, M Lee, T.D., Reich, P.B., & Tjoelker, M.G. (2003) Legume presence increases photosynthesis and N concentrations of cooccurring non-fixers but does not modulate their responsiveness to carbon dioxide enrichment. Oecologia, 137, 22-31. Artificial communities Nine-species plots of differing plant composition Lupinus perennis FE, M Lenz, T.I. & Facelli, J.M. (2003) Shade facilitates an invasive stem succulent in a chenopod shrubland in South Australia. Austral Ecology, 28, 480-490. Chenopod shrubland, Whyalla, South Australia Orbea variegata Atriplex vesicaria FE, M López-Pintor, A., Espigares, T., & Rey Benayas, J.M. (2003) Spatial segregation of plant species caused by Retama sphaerocarpa influence in a Mediterranean pasture: a perspective from the soil seed bank. Plant Ecology, 167, 107116. Mediterranean pasture, Torote, central Spain Species in seedbank Retama sphaerocarpa A, M Maestre, F.T., Bautista, S., & Cortina, J. (2003) Positive, negative, and net effects in grass-shrub interactions in Mediterranean semiarid grasslands. Ecology, 84, 3186-3197. Mediterranean semi-arid grassland, southeastern Spain Pistacia lentiscus Stipa tenacissima FE, M Martínez, M.L. (2003) Facilitation of seedling establishment by an endemic shrub in tropical coastal sand dunes. Plant Ecology, 168, 333-345. Tropical dune system, Gulf of Mexico Trachypogon plumosus, Schizachyrium scoparium Chamaecrista chamaecristoides A, FE, M Matthies, D. (2003) Positive and negative interactions among individuals of a root hemiparasite. Plant Biology, 5, 79-84. Grassland, Zurich, Switzerland Rhinanthus alectorolophus (seedlings) Rhinanthus alectorolophus (seedlings) FE, M Muñoz, A.A., Chacón, P., Pérez, F., Barnert, E.S., & Armesto, Temperate rainforest, J.J. (2003) Diversity and host tree preferences of vascular southern Chile epiphytes and vines in a temperate rainforest in southern Chile. Australian Journal of Botany, 51, 381 - 391. Epiphytes Trees A Page, J.P. & Michalet, R. (2003) A test of the indirect facilitation model in a temperate hardwood forest of the northern French Alps. Journal of Ecology, 91, 932-940. Hardwood forest, Alps, France Picea abies, Abies alba, Fagus sylvatica, Acer pseudoplatanus, Quercus petraea Molinia caerulea FE, M Peek, M.S. & Forseth, I.N. (2003) Microhabitat dependent responses to resource pulses in the aridland perennial, Cryptantha flava. Journal of Ecology, 91, 457-466. Sandy desert ecosystem, Utah, U.S.A. Cryptantha flava Shrubs A, FE, M Pennings, S.C., Selig, E.R., Houser, L.T., & Bertness, M.D. (2003) Geographic variation in positive and negative interactions among salt marsh plants. Ecology, 84, 1527-1538. Salt marsh, Maine, Rhode Island, Georgia, and Alabama, U.S.A. Nine species of salt marsh plants General FE, M Rudgers, J.A. & Maron, J.L. (2003) Facilitation between coastal dune shrubs: a non-nitrogen fixing shrub facilitates Coastal dunes, California, U.S.A. Lupinus arboreus Baccharis pilularis A, FE, M establishment of a nitrogen-fixer. Oikos, 102, 75-84. Schade, J.D., Sponseller, R., Collins, S.L., & Stiles, A. (2003) The influence of Prosopis canopies on understorey vegetation: effects of landscape position. Journal of Vegetation Science, 14, 743-750. Sonoran Desert, U.S.A. Understory vegetation Prosopis velutina A, M Schenk, H.J., Holzapfel, C., J.G., H., & Mahall, B.E. (2003) Spatial ecology of a small desert shrub on adjacent geological substrates. Journal of Ecology, 91, 383-395. Mojave Desert, U.S.A. Ambrosia dumosa, Acamptopappus sphaerocephalus Ambrosia dumosa A Siemann, E. & Rogers, W.E. (2003) Changes in light and nitrogen availability under pioneer trees may indirectly facilitate tree invasions of grasslands. Journal of Ecology, 91, 923-931. Grassland, Texas, U.S.A. Sapium sebiferum Celtis laevigata FE, M Stiling, P., Rossi, A.M., & Cattell, M.V. (2003) Associational resistance mediated by natural enemies. Ecological Entomology, 28, 587-592. Coastal communities, Florida, U.S.A. Iva frutescens Borrichia frutescens A, FE, M Tirado, R. & Pugnaire, F. (2003) Shrub spatial aggregation and consequences for reproductive success. Oecologia, 136, 296-301. Arid systems, Almeria, Spain Asparagus albus Ziziphus lotus FE, M Titus, J.H. & Tsuyuzaki, S. (2003) Influence of a non-native invasive tree on primary succession at Mt. Koma, Hokkaido, Japan. Plant Ecology, 169, 307-315. Successional woodland, Mt. Koma, Japan Salix reinii, General Larix kaempferi, Betula ermanii A Cappuccino, N. (2004) Allee effect in an invasive alien plant, pale swallow-wort Vincetoxicum rossicum (Asclepiadaceae). Oikos, 106, 3-8. Old fields, Ontario, Canada Vincetoxicum rossicum Vincetoxicum rossicum FE, M Castro, J., R. Zamora, J.A. Hodar and J. Gomez (2004) Seedling establishment of a boreal tree species (Pinus sylvestris) at its southernmost distribution limit: consequences of being in a marginal Mediterranean habitat. Journal of Ecology, 92, 266-277. Mediterranean forests, Spain Pinus sylvestris Shrubs A, FE, M Castro, J., Zamora, R., Hódar, J.A., & Gomez, J.M. (2004) Benefits of using shrubs as nurse plants for reforestation in Mediterranean mountains: a 4-year study. Restoration Ecology, 12, 352-358. Mediterranean forests, Sierra Nevada, southeast Spain Pinus sylvestris, Pinus nigra Salvia lavandulifolia FE, M Cleavitt, N. (2004) Comparative ecology of a lowland and a subalpine species of Mnium in the northern Rocky Mountains. Plant Ecology, 174, 205-216. Alppine communities, Rocky Mountains, Alberta, Canada. Mnium spinulosum Hylocomium splendens FE, M Davis, H.G., Taylor, C.M., Civille, J.C., & Strong, D.R. (2004) Salt marsh, Washington, An Allee effect at the front of a plant invasion: Spartina in a U.S.A. Pacific estuary. Journal of Ecology, 92, 321-327. Spartina alterniflora Spartina alterniflora A Ehlers, B.K. & Thompson, J. (2004) Do co-occurring plant species adapt to one another? The response of Bromus erectus to the presence of different Thymus vulgaris chemotypes. Oecologia, 141, 511-515. Artificial communities Bromus erectus Thymus vulgaris M, Lab Fensham, R.J. & Butler, D.W. (2004) Spatial pattern of dry rainforest colonizing unburnt Eucalyptus savanna. Austral Ecology, 29, 121-128. Savanna, north Queensland, Australia Rainforest trees Large savanna eucalypt trees A Fogel, B.N., Crain, C.M., & Bertness, M.D. (2004) Community level engineering effects of Triglochin maritima (seaside arrowgrass) in a salt marsh in northern New England, USA. Journal of Ecology, 92, 589-600. Salt marsh, Maine, U.S.A. General Triglochin maritima A, FE, M, Lab Gómez-Aparicio, L., Zamora, R., Gómez, H.M., Hódar, J.A., Castro, J., & Baraza, E. (2004) Applying plant facilitation to forest restoration: a meta-analysis of the use of shrubs as nurse plants. Ecological Applications, 14, 1128-1138. Alpine communities, Sierra Nevada, Spain 11 woody species 16 different nurse shrubs A, FE, M Klanderud, K. & Totland, Ø. (2004) Habitat dependent nurse effects of the dwarf-shrub Dryas octopetala on alpine and arctic plant community structure. Ecoscience, 11, 410-420. Alpine heath, Finse and Svalbard, Norway Vascular plants, Bryophytes, Lichens Dryas octopetala FE, M Ludwig, F., de Kroon, H., Berendse, F., & Prins, H.H.T. (2004) The influence of savanna trees on nutrient, water and light availability and the understorey vegetation. Plant Ecology, 170, 93-105. East African savanna, Kenya Grass spp. Acacia tortilis A, M Maestre, F.T., Cortina, J., & Bautista, S. (2004) Mechanisms underlying the interaction between Pinus halepensis and the native late-successional shrub Pistacia lentiscus in a semi-arid plantation. Ecography, 27, 776-786. Plantation woodland, Alicante, SE Spain Pistacia lentiscus Pinus halepensis A, FE, M Martinez, M.L., Perez-Maqueo, O., & Vasquez, V.M. (2004) Facilitative interactions on coastal dunes in response to seasonal weather fluctuations and benefactor size. Ecoscience, 11, 390-398. Mobile dune system, Gulf of Mexico Trachypogon plumosus, Schizachyrium scoparium Chamaecrista chamaecristoides A Moeller, D.A. (2004) Facililtative interactions among plants via shared pollinators. Ecology, 85, 3289-3301. Sierra Nevada, California, U.S.A. Clarkia xantiana ssp. xantiana Congeneric spp. A, M Nara, K. & Hogetsu, T. (2004) Ectomycorrhizal fungi on established shrubs facilitate subsequent seedling establishment of successional plant species. Ecology, 85, 1700-1707. Volcanic desert, Mt. Fuji, Betula ermanii, Larix Japan kaempferi Salix reinii A, M Oesterheld, M. & Oyarzábal, M. (2004) Grass-to-grass protection from grazing in a semi-arid steppe. Facilitation, competition, and mass effect. Oikos, 107, 576-582. Semi-arid steppe, Patagonia, Argentina Less preferred tussock grasses A, FE, M Bromus pictus Olofsson, J. (2004) Positive and negative plant-plant interactions in two contrasting arctic-alpine plant communities. Arctic, Antarctic, and Alpine Research, 36, 464467. Tundra heathlands, northern Sweden Carex bigelowii Dwarf shrubs A, FE, M Pugnaire, F., Armas, C., & Valladares, F. (2004) Soil as a mediator in plant-plant interactions in a semi-arid community. Journal of Vegetation Science, 15, 85-92. Savanna grasslands, Spain Stipa tenacissima, Lygeum spartum Arthrocnemum macrostachyum, Launaea arborescens, Lycium intricatum, Retama sphaerocarpa, Salsola oppositifolia, Thymus hyemalis A, M Reinhart, K.O. & Callaway, R.M. (2004) Soil biota facilitate exotic Acer invasions in Europe and North America. Ecological Applications, 14, 1737-1745. Woodlands: Madison, Wisconsin, U.S.A. and Rhone River near Sablons, France Acer negundo, Acer platanoides Acer negundo, Acer platanoides A, M, Lab Robinson, M.D. (2004) Growth and abundance of desert annuals in an arid woodland in Oman. Plant Ecology, 174, 137-145. Alluvial plain - desert, Oman Ephemeral plant community Acacia tortilis A, M Russell, F.L. & Fowler, N.L. (2004) Effects of white-tailed Forest, Texas, U.S.A. deer on the population dynamics of acorns, seedlings and small saplings of Quercus buckleyi. Plant Ecology, 173, 59-72. Quercus buckleyi Juniperus ashei FE, M Verdú, M., Villar-Salvador, P., & García-Fayos, P. (2004) Gender effects on the post-facilitation performance of two dioecious Juniperus species. Functional Ecology, 18, 87-93. High-mountain shrublands, eastern Spain Juniperus communis Juniperus sabina A, M Wilby, A. & Sachak, M. (2004) Shrubs, granivores and annual plant community stability in an arid ecosystem. Oikos, 106, 209-216. Negev desert, Israel Annuals Dwarf shrubs FE Zvereva, E.L. & Kozlov, M.V. (2004) Facilitative effects of top-canopy plants on four dwarf shrub species in habitats severely disturbed by pollution. Journal of Ecology, 92, 288296. Forests, Kola Peninsula (NW Russia) Vaccinium myrtillus, V. uliginosum, V. vitisidaea, Empetrum nigrum ssp. hermaphroditum Trees A, FE, M Armas, C., & Pugnaire, F. (2005) Plant interactions govern population dynamics in a semiarid plant community. Journal of Ecology, 93, 978-989. Semiarid savanna grasslands, Spain Stipa tenacissima Cistus clusii FE, M Callaway, R.M., Kikodze, D., Chiboshvili, M., & Khetsuriani, L. (2005) Unpalatable plants protect neighbors from grazing and increase plant community diversity. Ecology, 86, 18561862. Subalpine meadow, central Caucasus, Georgia Anthoxanthum odoratum, Phleum alpinum, General Cirsium obalatum, Veratrum lobelianum A, FE, M Cavieres, L.A., Quiroz, C.L., Molina-Montenegro, M.A., Munoz, A.A., & Pauchard, A. (2005) Nurse effect of the native cushion plant Azorella monantha on the invasive nonnative Taraxacum officinale in the high-Andes of central Chile. Perspectives in Plant Ecology, Evolution and Systematics, 7, 217-226. Alpine communities, central Chilean Andes Taraxacum officinale Azorella monantha A, FE, M Christian, S., Béguin, D., Buttler, A., & Müller-Schärer, H. (2005) Safe sites for tree regeneration in wooded pastures: A case of associational resistance? Journal of Vegetation Science, 16, 209-214. Wooded pastures, Jura mountains, Switzerland Picea abies Unpalatable plants A, M Dickie, I.A., Schnitzer, S.A., Reich, P.B., & Hobbie, S.E. (2005) Spatially disjunct effects of co-occurring competition and facilitation. Ecology Letters, 8, 1191-1200. Old-field woodland succession, Cedar Creek LTER, Minnesota, U.S.A. Quercus macrocarpa Quercus ellipsoidalis A, M Eckstein, R.L. (2005) Differential effects of interspecific interactions and water availability on survival, growth and fecundity of three congeneric grassland herbs. New Grassland, Giessen, Germany Viola spp. General FE, M Phytologist, 166, 525-536. Eckstein, R.L. & Donath, T.W. (2005) Interactions between litter and water availability affect seedling emergence in four familial pairs of floodplain species. Journal of Ecology, 93, 807-816. Artificial communities General General M, Lab Gómez, J.M. (2005) Long-term effects of ungulates on performance, abundance and spatial distribution of two montane herbs. Ecological Monographs, 75, 231-258. Mixed scrub woodland, Mediterranean mountains, southeastern Spain Erysimum mediohispanicum, Erysimum baeticum Shrubs FE, M Gómez-Aparicio, L., Gómez, J.M., & Zamora, R. (2005) Microhabitats shift rank in suitability for seedling establishment depending on habitat type and climate. Journal of Ecology, 93, 1194-1202. Mediterranean forests, Sierra Nevada and Sierra De Baza National Parks, southern Spain Acer opalus Trees, shrubs A Gómez-Aparicio, L., Gómez, J.M., Zamora, R., & Boettinger, J.L. (2005) Canopy vs. soil effects of shrubs facilitating tree seedlings in Mediterranean montane ecosystems. Journal of Vegetation Science, 16, 191-198. Mediterranean montane shrublands, Sierra Nevada National Park, southeastern Spain Trees Shrubs FE, M Gómez-Aparicio, L., Valladares, F., Zamora, R., & Quero, J.L. (2005) Response of tree seedlings to the abiotic heterogeneity generated by nurse shrubs: an experimental approach at different scales. Ecography, 28, 757-768. Mediterranean montane shrublands, Sierra Nevada National Park, southeastern Spain Acer opalus, Quercus pyrenaica, Quercus ilex Shrubs A Gómez-Aparicio, L., Zamora, R., & Gómez, J.M. (2005) The regeneration status of the endangered Acer opalus subsp. granatense throughout its geographical distribution in the Iberian Peninsula. Biological Conservation, 121, 195-206. Iberian peninsula Acer opalus subspp. granatense Shrubs A, FE, M Henriquez, J.M. & Lusk, C.H. (2005) Facilitation of Nothofagus antarctica (Fagaceae) seedlings by the prostrate shrub Empetrum rubrum (Empetraceae) on glacial moraines in Patagonia. Austral Ecology, 30, 877-882. Glacial moraines, Patagonia, Chile Nothofagus antarctica Empetrum rubrum A, FE, M Klanderud, K. (2005) Climate change effects on species interactions in an alpine plant community. Journal of Ecology, 93, 127-137. Alpine dwarf shrub heath, Finse, southern Norway Carex vaginata, Thalictrum alpinum Dryas octopetala FE Klanderud, K. & Totland, Ø. (2005) The relative importance of neighbours and abiotic environmental conditions for population dynamic parameters of two alpine plant species. Journal of Ecology, 93, 493-501 Alpine dwarf shrub heath, Finse, southern Norway Carex vaginata, Thalictrum alpinum Dryas octopetala FE Lloret, F., Peñuelas, J., & Estiarte, M. (2005) Effects of vegetation canopy and climate on seedling establishment in Mediterranean shrubland. Journal of Vegetation Science, 16, 67-76. Mediterranean shrubland, General Barcelona, Spain General FE, M Lortie, C.J., Ellis, E., Novoplansky, A., & Turkington, R. (2005) Implications of spatial pattern and local density on community-level interactions. Oikos, 109, 495-502. Desert annual community, General General FE Maher, E.L., Germino, M.J., & Hasselquist, N.J. (2005) Interactive effects of tree and herb cover on survivorship, physiology, and microclimate of conifer seedlings at the alpine tree-line ecotone. Canadian Journal of Forest Research, 35, 567-574. Alpine tree-line ecotone, Wyoming, U.S.A. Pinus albicaulis, Picea engelmannii, Abies lasiocarpa Herbs, Trees A, FE, M Petit, S. & Dickson, C.R. (2005) Grass tree (Xanthorrhoea semiplana, Lliliaceae) facilitation of the endangered pink lipped spider orchid (Caladenia syn. Arachnorchis behrii, Orchidaceae) varies in south Australia. Australian Journal of Botany, 53, 455-464. Northern Adelaide region, Australia Caladenia syn. Arachnorchis behrii Xanthorrhoea semiplana A, M Proffitt, C.E., Chiasson, R.L., Owens, A.B., Edwards, K.R., & Travis, S.E. (2005) Spartina alterniflora genotype influences facilitation and suppression of high marsh species colonizing an early successional salt marsh. Journal of Ecology, 93, 404416. Salt marsh, Louisiana, U.S.A. Multiple species Spartina alterniflora A, M Riginos, C., Milton, S.J., & Wiegand, T. (2005) Contextdependent interactions between adult shrubs and seedlings in a semi-arid shrubland. Journal of Vegetation Science, 16, 331340. Succulent Karoo, Western Cape, South Africa Shrubs Shrubs A, FE, M, Lab Zou, C.B., Barnes, P.W., Archer, S., & McMurtry, C.R. (2005) Soil moisture redistribution as a mechanism of facilitation in savanna tree-shrub clusters. Oecologia, 145, 32-40. Subtropical savanna parkland, texas, U.S.A. Shrubs Trees A, FE, M Alados, C.L., Gotor, P., Ballester, P., Navas, D., Escos, J.M., Navarro, T., & Cabezudo, B. (2006) Association between competition and facilitation processes and vegetation spatial patterns in alpha steppes. Biological Journal of the Linnean Society, 87, 103-113. Semiarid Mediterranean matorral General Shrubs A Badano, E.I. & Cavieres, L.A. (2006) Impacts of ecosystem engineers on community attributes: effects of cushion plants at different elevations of the Chilean Andes. Diversity and Distributions, 12, 388-396. High-Andean alpine plant community, Chile General Azorella compacta, Laretia acaulis, Silene acaulis A Baumeister, D. & Callaway, R.M. (2006) Facilitative effects of Pinus flexilis during succession: a hierarchy of mechanisms benefits other plant species. Ecology, 87, 1816-1930. Forest-grassland ecotone, Montana, U.S.A. Pseudotsuga menziesii, Ribes cereum Pinus flexilis FE, M Brooker, R.W., Scott, D., Palmer, S.C.F., & Swaine, E. (2006) Transient facilitative effects of heather on Scots pine along a grazing disturbance gradient in Scottish moorland. Journal of Ecology, 94, 637-645. Heather moorland, Cairngorm Mountains, Scotland Pinus sylvestris Calluna vulgaris FE, M Cavieres, L.A., Badano, E.I., Sierra-Almeida, A., GómezAlpine communities, González, S., & Molina-Montenegro, M.A. (2006) Positive central Chilean Andes interactions between alpine plant species and the nurse cushion plant Laretia acaulis do not increase with elevation in the Andes of central Chile. New Phytologist, 169, 59-69. General Laretia acaulis A, M Holzapfel, C., Tielbörger, K., Paragb, H.A., Kigel, J., & Sternberga, M. (2006) Annual plant-shrub interactions along an aridity gradient. Basic and Applied Ecology, 7, 268-279. Desert to mesic Mediterranean regions, Israel Annuals Shrubs A Kikvidze, Z., Khetsuriani, L., Kikodze, D., & Callaway, R.M. (2006) Seasonal shifts in competition and facilitation in subalpine plant communities of the central Caucasus. Journal of Vegetation Science, 17, 77-82. Subalpine meadow, central Caucasus, Georgia Hordeum violaceum, Trifolium ambiguum General FE Kost, C. & Heil, M. (2006) Herbivore-induced plant volatiles induce an indirect defence in neighbouring plants. Journal of Ecology, 94, 619-628. Roadside vegetation, Oaxaca, Mexico Phaseolus lunatus Phaseolus lunatus FE, M, Lab Kunstler, G., Curt, T., Bouchaud, M., & Lepart, J. (2006) Indirect facilitation and competition in tree species colonization of sub-Mediterranean grasslands. Journal of Vegetation Science, 17, 379-388. Grassland, Causse du Larzac plateau, southern France Fagus sylvatica, Quercus pubescens Shrubs FE, M Lab Milbrandt, E.C. & Tinsley, M.N. (2006) The role of saltwort (Batis maritima L.) in regeneration of degraded mangrove forests. Hydrobiologia, 568, 369-377. Fringe mangrove forests, southwest Florida, U.S.A. Avicennia germinans Batis maritima FE, M Miriti, M.N. (2006) Ontogenetic shift from facilitation to competition in a desert shrub. Journal of Ecology, 94, 973979. Colorado Desert, California, U.S.A. Ambrosia dumosa Ambrosia dumosa A Nara, K. (2006a) Pioneer dwarf willow may facilitate tree succession by providing late colonizers with compatible ectomycorrhizal fungi in a primary successional volcanic Volcanic desert, Mount Fuji, Japan Betula ermanii, Larix kaempferi Salix reinii A, M desert. New Phytologist, 171, 187-198. Ramirez, J.M., Rey, P.J., Alcantara, J.M., & SanchezLafuente, A.M. (2006) Altitude and woody cover control recruitment of Helleborus foetidus in a Mediterranean mountain area. Ecography, 29, 375-384. Mixed oak - spiny shrub vegetation, Jaen province, southeastern Spain Helleborus foetidus Woody species A, FE Reinhart, K.O., Gurnee, J., Tirado, R., & Callaway, R.M. (2006) Invasion through quantitative effects: intense shade as a driver of invasive success and native decline. Ecological Applications, 16, 1821-1831. Riparian system in mixed deciduous forest, Montana, U.S.A. Acer platanoides Acer platanoides A, FE Schiffers, K. & Tielbörger, K. (2006) Ontogenetic shifts in interactions among annual plants. Journal of Ecology, 94, 336341. Desert rainfall gradient, Israel Biscutella didyma, Hymenocarpos circinnatus General A, FE Smit, C., Den Ouden, J., & Müller-Schärer, H. (2006) Unpalatable plants facilitate tree sapling survival in wooded pastures. Journal of Ecology, 43, 305-312. Wooded pastures, Switzerland Picea abies Gentiana lutea, Cirsium acaule FE, M Sthultz, C.M., Gehring, C.A., & Whitham, T.G. (2006) Shifts from competition to facilitation between a foundation tree and a pioneer shrub across spatial and temporal scales in a semiarid woodland. New Phytologist, 173, 135-145. Semi-arid woodland, Arizona, U.S.A. Pinus edulis Fallugia paradoxa FE Valiente-Banuet, A., Rumebe, A.V., Verdú, M., & Callaway, R.M. (2006) Modern Quaternary plant lineages promote diversity through facilitation of ancient Tertiary lineages. Proceedings of the National Academy of Sciences, 103, 1681216817. Mediterranean-climate ecosystems General General A, M Wipf, S., Rixen, C., & Mulder, C.P.H. (2006) Advanced snowmelt causes shift towards positive neighbour interactions in a subarctic tundra community. Global Change Biology, 12, 1-11. Subarctic tundra, Alaska, U.S.A. Empetrum nigrum General FE, M Anthelme, F., Michalet, R., & Saadouc, M. (2007) Positive associations involving the tussock grass Panicum turgidum Forssk. in the Aïr-Ténéré Reserve, Niger. Journal of Arid Environments, 68, 348-362. Saharan mountain range, Aft, Niger General Panicum turgidum A, M