American Perceptions of Immigrant and Invasive Species
... Siamese catWsh crawl out of a canal choked with the Asian weed hydrilla, while Columbian iguanas scampered through Australian pines beneath a squadron of Amazonian parakeets.”5 In the trans-Mississippi West, Wre-adapted cheatgrass from Eurasia encroaches on scrublands hitherto dominated by sagebrush ...
... Siamese catWsh crawl out of a canal choked with the Asian weed hydrilla, while Columbian iguanas scampered through Australian pines beneath a squadron of Amazonian parakeets.”5 In the trans-Mississippi West, Wre-adapted cheatgrass from Eurasia encroaches on scrublands hitherto dominated by sagebrush ...
IJEE SOAPBOX: PRINCE KROPOTKIN MEETS THE
... the net relationship between species at other trophic levels. For instance, if two predators feeding on two prey species overlap in their diets, one might expect the predators to compete. But if the prey themselves directly compete, the predators might actually be net mutualists (Levine, 1976; Vande ...
... the net relationship between species at other trophic levels. For instance, if two predators feeding on two prey species overlap in their diets, one might expect the predators to compete. But if the prey themselves directly compete, the predators might actually be net mutualists (Levine, 1976; Vande ...
Primary succession on Mount St. Helens, with reference to Surtsey
... 2005). Ridge richness declined after 1998 (Fig. 2). In each case, there was a core of species (stable) and several species with sporadic occurrences. Sporadic species absent for at least the last three years are deemed “extinct” (Table 1). More species persisted at higher elevations where cover was ...
... 2005). Ridge richness declined after 1998 (Fig. 2). In each case, there was a core of species (stable) and several species with sporadic occurrences. Sporadic species absent for at least the last three years are deemed “extinct” (Table 1). More species persisted at higher elevations where cover was ...
Quantifying the evidence for biodiversity effects on ecosystem
... restoration: a meta-analysis. Science, 325, 1121-1124. ...
... restoration: a meta-analysis. Science, 325, 1121-1124. ...
Biodiversity and ecosystem functioning: It is time for dispersal
... The experimental study of the relationship between biodiversity and ecosystem function has mainly addressed the effect of species and number of functional groups. In theory, this approach has mainly focused on how extinction affects function, whereas dispersal limitation of ecosystem function has be ...
... The experimental study of the relationship between biodiversity and ecosystem function has mainly addressed the effect of species and number of functional groups. In theory, this approach has mainly focused on how extinction affects function, whereas dispersal limitation of ecosystem function has be ...
Rare Invertebrates of the South Okanagan
... grasshoppers. They are easily recognized by their long, slender, neck-like thorax and grasping front legs. The Ground Mantid is the only mantid native to Canada. In this country it is known only from the dry grasslands of the extreme South Okanagan near Oliver and Osoyoos. This enigmatic, rare preda ...
... grasshoppers. They are easily recognized by their long, slender, neck-like thorax and grasping front legs. The Ground Mantid is the only mantid native to Canada. In this country it is known only from the dry grasslands of the extreme South Okanagan near Oliver and Osoyoos. This enigmatic, rare preda ...
two degrees of separation in complex food webs
... D decreases a factor of two with an order-ofmagnitude increase of C in an approximate power law relationship whose slope is greater for smaller webs (Fig. 1). For webs with constant C, D decreases weakly with increasing S (Fig. 3), contrary to earlier expectations14. As S increases 2 orders of magni ...
... D decreases a factor of two with an order-ofmagnitude increase of C in an approximate power law relationship whose slope is greater for smaller webs (Fig. 1). For webs with constant C, D decreases weakly with increasing S (Fig. 3), contrary to earlier expectations14. As S increases 2 orders of magni ...
Chapter 5 notes
... • Intense natural selection pressures between predator and prey populations • Coevolution – Interact over a long period of time – Changes in the gene pool of one species can cause changes in the gene pool of the other ...
... • Intense natural selection pressures between predator and prey populations • Coevolution – Interact over a long period of time – Changes in the gene pool of one species can cause changes in the gene pool of the other ...
video slide - Ethical Culture Fieldston School
... 38.3 Habitat destruction, introduced species, and overexploitation are the major threats to biodiversity • Human alteration of habitat is the greatest single threat to biodiversity • Introduced species can disrupt communities by competing with or preying on native species • Overexploitation of wil ...
... 38.3 Habitat destruction, introduced species, and overexploitation are the major threats to biodiversity • Human alteration of habitat is the greatest single threat to biodiversity • Introduced species can disrupt communities by competing with or preying on native species • Overexploitation of wil ...
Indicators of Biodiversity for Ecologically Sustainable Forest
... Although the concept of indicator species has considerable intuitive appeal, there are many instances where its application would be unsuccessful. The American chestnut (Castanea dentata) is an example of the failure of a species as a type 4 indicator. The American chestnut was once one of the domin ...
... Although the concept of indicator species has considerable intuitive appeal, there are many instances where its application would be unsuccessful. The American chestnut (Castanea dentata) is an example of the failure of a species as a type 4 indicator. The American chestnut was once one of the domin ...
deflected succession
... compete for exactly the same resources for an extended period of time. (G.F. Gause) • One will either migrate, become extinct, or partition the resource and utilize a sub-set of the same resource. • Given resource can only be partitioned a finite number of times. ...
... compete for exactly the same resources for an extended period of time. (G.F. Gause) • One will either migrate, become extinct, or partition the resource and utilize a sub-set of the same resource. • Given resource can only be partitioned a finite number of times. ...
4.1: Communities and ecosystems
... The scientific name of a species consists of two words; both words are italicized but only the first word is capitalized. For example Homo sapiens, the scientific name for humans, indicates that humans are one kind of ape in the genus Homo. Benefits of the binomial nomenclature system include: 1) It ...
... The scientific name of a species consists of two words; both words are italicized but only the first word is capitalized. For example Homo sapiens, the scientific name for humans, indicates that humans are one kind of ape in the genus Homo. Benefits of the binomial nomenclature system include: 1) It ...
Top predator control of plant biodiversity and productivity in an old
... Connecticut, USA. Overall, this system contains 18 species of plants, although fewer coexist locally. Sampling, by clipping 50, 1 m2 plots, sorting plants to species, drying at 60 "C and weighing revealed that the dominant (>90.6% biomass) species are the herbs Solidago rugosa, S. graminifolia, Pote ...
... Connecticut, USA. Overall, this system contains 18 species of plants, although fewer coexist locally. Sampling, by clipping 50, 1 m2 plots, sorting plants to species, drying at 60 "C and weighing revealed that the dominant (>90.6% biomass) species are the herbs Solidago rugosa, S. graminifolia, Pote ...
2007 Annual Report - East Lothian Council
... recorded in map format, albeit hand-drawn. It is hoped that these can be digitised in time to make the information more available. 9.2.4 Two species, however, fern-grass (Catapodium rigidum) and leafy rush (Juncus foliosus) could not be located at previously identified localities. The Countryside Ra ...
... recorded in map format, albeit hand-drawn. It is hoped that these can be digitised in time to make the information more available. 9.2.4 Two species, however, fern-grass (Catapodium rigidum) and leafy rush (Juncus foliosus) could not be located at previously identified localities. The Countryside Ra ...
threatened plants of canterbury including a revised species list
... although it is not a limestone obligate. Apart from those species that are highly localised in either distribution or habitat, modification of indigenous communities by humans is a major reason for the number of threatened plants found in Canterbury. Human impacts have been most severe in lowland ar ...
... although it is not a limestone obligate. Apart from those species that are highly localised in either distribution or habitat, modification of indigenous communities by humans is a major reason for the number of threatened plants found in Canterbury. Human impacts have been most severe in lowland ar ...
Explaining the global biodiversity gradient: energy, area, history and
... this influence: species richness should be proportional to the area of the metacommunity (Eq. (2)). This is defined as the distance over which a species can spread from its point of origin before it becomes extinct or speciates. If we accept that dispersal is predominantly east–west, this could be t ...
... this influence: species richness should be proportional to the area of the metacommunity (Eq. (2)). This is defined as the distance over which a species can spread from its point of origin before it becomes extinct or speciates. If we accept that dispersal is predominantly east–west, this could be t ...
Alpine Arthropod Diversity
... altitudes could be found. In order to kill and preserve the captured specimens the traps were filled to about one fourth with either glycol or a saturated saline solution. In this way the traps could remain funcional even after quite heavy rainfall. When the traps were emptied the excess conservatio ...
... altitudes could be found. In order to kill and preserve the captured specimens the traps were filled to about one fourth with either glycol or a saturated saline solution. In this way the traps could remain funcional even after quite heavy rainfall. When the traps were emptied the excess conservatio ...
Vegetation in North America Series: Abstract of Biomes Dominated
... the lowest elevations (where rainfall is low and evapotranspiration rates are high), through Douglas-fir and spruce-fir forests at the middle elevations (where moisture from orographic precipitation is high), to alpine vegetation at the highest points (where low temperatures becomes a limiting facto ...
... the lowest elevations (where rainfall is low and evapotranspiration rates are high), through Douglas-fir and spruce-fir forests at the middle elevations (where moisture from orographic precipitation is high), to alpine vegetation at the highest points (where low temperatures becomes a limiting facto ...
produktivitas ekosistem dan jasanya
... Pollination of crops by bees is required for 1530% of U.S. food production; most largescale farmers import non-native honey bees to provide this service. One study reports that in California’s agricultural region, it was found that wild bees alone could provide partial or complete pollination servi ...
... Pollination of crops by bees is required for 1530% of U.S. food production; most largescale farmers import non-native honey bees to provide this service. One study reports that in California’s agricultural region, it was found that wild bees alone could provide partial or complete pollination servi ...
BIG-GAME AND RODENT RELATIONSHIPS
... and ultimately upon themselves as well. Obviously in order to cover a subject of this magni tude in a short paper, it has been necessary to condense the presentation as much as possible. The species of ani mals include only those typical of forests and grasslands north of the Mexican boundary. ...
... and ultimately upon themselves as well. Obviously in order to cover a subject of this magni tude in a short paper, it has been necessary to condense the presentation as much as possible. The species of ani mals include only those typical of forests and grasslands north of the Mexican boundary. ...
Restoring tropical diversity: beating the time tax on species loss
... 1. Fragmentation of tropical forest is accelerating at the same time that already cleared land reverts to secondary growth. Fragments inexorably lose deep-forest species to local extinction while embedded in low-diversity stands of early successional pioneer trees. 2. Pasture matrices undergoing pas ...
... 1. Fragmentation of tropical forest is accelerating at the same time that already cleared land reverts to secondary growth. Fragments inexorably lose deep-forest species to local extinction while embedded in low-diversity stands of early successional pioneer trees. 2. Pasture matrices undergoing pas ...
Invasional meltdown 6 years later: important
... or could be harmed, but insignificantly, while the recipient of the aid is greatly helped, so the net effect is increased invasion. Stronger would be mutual facilitation, in which each species aids the other. This is still a population process and would still not, by itself, constitute meltdown. Mel ...
... or could be harmed, but insignificantly, while the recipient of the aid is greatly helped, so the net effect is increased invasion. Stronger would be mutual facilitation, in which each species aids the other. This is still a population process and would still not, by itself, constitute meltdown. Mel ...
An Index of Diversity and the Relation of Certain Concepts to Diversity
... overlapping,or synonymousmeanings. ness is the same throughout the area studied. In Most widely used are the antonyms: poor- multi-species communities a test of homogeneity rich, uniform-diverse, homogeneous-heterogene-in the statistical sense has rarely been applied to All have been applied to othe ...
... overlapping,or synonymousmeanings. ness is the same throughout the area studied. In Most widely used are the antonyms: poor- multi-species communities a test of homogeneity rich, uniform-diverse, homogeneous-heterogene-in the statistical sense has rarely been applied to All have been applied to othe ...
What are the major stumbling stones for halt
... no activity at all, as policy makers have no certainty about the effectiveness of possible conservation measures. The precautionary principle has been suggested and implemented to avoid inactivity excused by lack of scientific certainty, as noted in the preamble of the CBD: “Where there is a threat ...
... no activity at all, as policy makers have no certainty about the effectiveness of possible conservation measures. The precautionary principle has been suggested and implemented to avoid inactivity excused by lack of scientific certainty, as noted in the preamble of the CBD: “Where there is a threat ...
Bifrenaria
Bifrenaria, abbreviated Bif. in horticultural trade, is a genus of plant in family Orchidaceae. It contains 20 species found in Panama, Trinidad and South America. There are no known uses for them, but their abundant, and at first glance artificial, flowers, make them favorites of orchid growers.The genus can be split in two clearly distinct groups: one of highly robust plants with large flowers, that encompass the first species to be classified under the genus Bifrenaria; other of more delicate plants with smaller flowers occasionally classified as Stenocoryne or Adipe. There are two additional species that are normally classified as Bifrenaria, but which molecular analysis indicate to belong to different orchid groups entirely. One is Bifrenaria grandis which is endemic to Bolívia and which is now placed in Lacaena, and Bifrenaria steyermarkii, an inhabitant of the northern Amazon Forest, which does not have an alternative classification.