The river Rhine: a global highway for dispersal of aquatic invasive
... arriving in downstream areas. Temporal analyses of macroinvertebrate assemblages in the littoral zones indicate that native species are displaced by nonindigenous species. However, established non-indigenous species are also displaced by more recent mass invaders. Keywords Dispersal rate Invasion ...
... arriving in downstream areas. Temporal analyses of macroinvertebrate assemblages in the littoral zones indicate that native species are displaced by nonindigenous species. However, established non-indigenous species are also displaced by more recent mass invaders. Keywords Dispersal rate Invasion ...
Niche and fitness differences relate the maintenance of diversity to
... competitors are solutions to Ṅi ¼ Nigi(N) for i ¼ 1 . . . n, where the per capita growth rate, gi, is a scalar function of the vector of state variables, N. The dimension of N may exceed n when growth rates depend on variables other than the n competitors. In Eq. 1, for example, N also includes res ...
... competitors are solutions to Ṅi ¼ Nigi(N) for i ¼ 1 . . . n, where the per capita growth rate, gi, is a scalar function of the vector of state variables, N. The dimension of N may exceed n when growth rates depend on variables other than the n competitors. In Eq. 1, for example, N also includes res ...
Biological Synopsis of the colonial tunicates
... exhibit variable growth and reproductive patterns depending on the temperature and food regime. Colonial tunicates generally have few predators, particularly B. violaceus which may give it a competitive advantage over B. schlosseri in some environments. Major dispersal mechanisms are rafting on floa ...
... exhibit variable growth and reproductive patterns depending on the temperature and food regime. Colonial tunicates generally have few predators, particularly B. violaceus which may give it a competitive advantage over B. schlosseri in some environments. Major dispersal mechanisms are rafting on floa ...
Tehachapi Pocket Mouse (Perognathus alticolus
... boylii), western harvest mouse (Reithrodontomys megalotis), California pocket mouse (Chaetodipus californicus), little pocket mouse (Perognathus longimembris), agile kangaroo rat (Dipodomys agilis), desert woodrat (Neotoma lepida), pocket gopher (Thomomys bottae), and California vole (Microtus calif ...
... boylii), western harvest mouse (Reithrodontomys megalotis), California pocket mouse (Chaetodipus californicus), little pocket mouse (Perognathus longimembris), agile kangaroo rat (Dipodomys agilis), desert woodrat (Neotoma lepida), pocket gopher (Thomomys bottae), and California vole (Microtus calif ...
Landscape composition influences patterns of native and exotic lady
... and 3528 studies that examined the effects of invasion, only 1.2% considered both potential impacts on native biodiversity. From a conservation and ecosystem services perspective, it is critical to determine how these factors influence populations of native species. Herein, we investigate the influe ...
... and 3528 studies that examined the effects of invasion, only 1.2% considered both potential impacts on native biodiversity. From a conservation and ecosystem services perspective, it is critical to determine how these factors influence populations of native species. Herein, we investigate the influe ...
WHAT`S NEW IN Biological Control of Weeds?
... this relationship in more detail we conducted an exclusion experiment at a site with abundant scale insects. The results showed that under normal conditions leafroller larval survival was zero. However, where wasps and ants were excluded using sleeves and sticky barriers larval survival was high. Sc ...
... this relationship in more detail we conducted an exclusion experiment at a site with abundant scale insects. The results showed that under normal conditions leafroller larval survival was zero. However, where wasps and ants were excluded using sleeves and sticky barriers larval survival was high. Sc ...
interactive effects of predation and dispersal on
... Abstract. Communities of coexisting organisms are formed by both dispersal among habitat patches in a region and local interactions within patches. The supply of colonists from the regional pool has the potential to alter the outcome of local interactions by providing species that fill different eco ...
... Abstract. Communities of coexisting organisms are formed by both dispersal among habitat patches in a region and local interactions within patches. The supply of colonists from the regional pool has the potential to alter the outcome of local interactions by providing species that fill different eco ...
Compromising genetic diversity in the wild: unmonitored large
... associated with releases are largely neglected. We outline key features of programs to effectively monitor consequences of such releases on natural populations. Occurrence of large-scale releases The continued large-scale exploitation of wild animals and plants through activities such as fishing, hu ...
... associated with releases are largely neglected. We outline key features of programs to effectively monitor consequences of such releases on natural populations. Occurrence of large-scale releases The continued large-scale exploitation of wild animals and plants through activities such as fishing, hu ...
HYBRIDIZATION BETWEEN AN INVASIVE AND A NATIVE
... O. rusticus as live bait is likely responsible for much of this spread (Berrill, 1978). We examined hybridization between introduced O. rusticus and native O. sanbornii (Faxon, 1884) in north-central Ohio. The native range of O. sanbornii extends from central Ohio to parts of Kentucky and West Virgi ...
... O. rusticus as live bait is likely responsible for much of this spread (Berrill, 1978). We examined hybridization between introduced O. rusticus and native O. sanbornii (Faxon, 1884) in north-central Ohio. The native range of O. sanbornii extends from central Ohio to parts of Kentucky and West Virgi ...
Biodiversity, Stability, and Productivity in Competitive Communities
... any of the following: the tendency to return after perturbation; the time for a perturbation to decay to a specified fraction of its initial size (resilience, Pimm 1991); how much a measurement fluctuates over time (variability, Pimm 1991); how long a condition lasts before it changes (persistence, ...
... any of the following: the tendency to return after perturbation; the time for a perturbation to decay to a specified fraction of its initial size (resilience, Pimm 1991); how much a measurement fluctuates over time (variability, Pimm 1991); how long a condition lasts before it changes (persistence, ...
State of the Eastern Scotian Shelf Ecosystem
... Shelf is no exception. For instance, overexploitation was one of the factors contributing to the collapse of cod and haddock in the early 1990s, which were subsequently placed under a fishing moratorium. Such human activities have the potential to influence the structure of biological communities th ...
... Shelf is no exception. For instance, overexploitation was one of the factors contributing to the collapse of cod and haddock in the early 1990s, which were subsequently placed under a fishing moratorium. Such human activities have the potential to influence the structure of biological communities th ...
Malayan tapir - the El Paso Zoo
... The Malayan Tapir (Tapirus indicus), also called the Asian Tapir, is the largest of the four species of tapir and the only one native to Asia. The scientific name is somewhat misleading, as the Tapirus indicus is not native to India; the name refers rather to the East Indies. General Appearance and ...
... The Malayan Tapir (Tapirus indicus), also called the Asian Tapir, is the largest of the four species of tapir and the only one native to Asia. The scientific name is somewhat misleading, as the Tapirus indicus is not native to India; the name refers rather to the East Indies. General Appearance and ...
Trophic complementarity drives the biodiversityecosystem
... A and C are interaction matrices representing, respectively, the bipartite networks for predation and resource consumption, in which the consuming organisms (predators and consumers respectively) are in rows, and the consumed organisms (consumers and resources respectively) are in columns. Values wi ...
... A and C are interaction matrices representing, respectively, the bipartite networks for predation and resource consumption, in which the consuming organisms (predators and consumers respectively) are in rows, and the consumed organisms (consumers and resources respectively) are in columns. Values wi ...
bakersfield cactus - Bakersfield Habitat Conservation Plan
... efforts are small plants are preferable to pads for translocation. Large plants disarticulate during the process so pads have lower survival rates, but larger, heavier pads tend to grow faster and have higher survival rates. Pads should be placed upright in pots and allowed to develop roots prior to ...
... efforts are small plants are preferable to pads for translocation. Large plants disarticulate during the process so pads have lower survival rates, but larger, heavier pads tend to grow faster and have higher survival rates. Pads should be placed upright in pots and allowed to develop roots prior to ...
Contingent fire effects on granivore removal of exotic woody plant
... that granivores can affect the pattern and rate of woody plant recruitment by altering the distribution and viability of seeds (Schnurr et al. 2004; Côté et al. 2005; Zwolak et al. 2010; Vaz Ferreira et al. 2011). Granivory is expected to influence woody encroachment when seed limitation has a gre ...
... that granivores can affect the pattern and rate of woody plant recruitment by altering the distribution and viability of seeds (Schnurr et al. 2004; Côté et al. 2005; Zwolak et al. 2010; Vaz Ferreira et al. 2011). Granivory is expected to influence woody encroachment when seed limitation has a gre ...
Seaside Centipede Lichen (Heterodermia sitchensis)
... Heterodermia sitchensis is among the most northerly members of a predominantly tropical to warm temperate genus. It is also essentially endemic to Canada, where it occupies a very narrow latitudinal range along the west coast of Vancouver Island. The soredia-bearing "urns" located near the lobe tips ...
... Heterodermia sitchensis is among the most northerly members of a predominantly tropical to warm temperate genus. It is also essentially endemic to Canada, where it occupies a very narrow latitudinal range along the west coast of Vancouver Island. The soredia-bearing "urns" located near the lobe tips ...
articolo completo - Società Italiana Scienza della
... effects are to be expected as there are others which will replace it, at least in a major part. Thus, most of the species are unnecessary (superfluous), as the passengers of an aircraft are unnecessary for the plane to fly; only a few members of the crew play a decisive role similar to that of some ...
... effects are to be expected as there are others which will replace it, at least in a major part. Thus, most of the species are unnecessary (superfluous), as the passengers of an aircraft are unnecessary for the plane to fly; only a few members of the crew play a decisive role similar to that of some ...
"Biotic Homogenization". - University of Washington
... Biotic homogenization may also be accompanied by significant evolutionary consequences. Much like how the future of speciation is tightly linked with the future of species diversity, biotic homogenization may compromise the potential for future speciation because of limited spatial variability in spe ...
... Biotic homogenization may also be accompanied by significant evolutionary consequences. Much like how the future of speciation is tightly linked with the future of species diversity, biotic homogenization may compromise the potential for future speciation because of limited spatial variability in spe ...
Competition in lichen communities
... Lichens are symbiotic organisms that often dominate stressful environments such as the surfaces of rock and tree bark. Whether or not competition occurs between lichens in these environments, however, is controversial. This review considers various aspects of the competitive interactions between lic ...
... Lichens are symbiotic organisms that often dominate stressful environments such as the surfaces of rock and tree bark. Whether or not competition occurs between lichens in these environments, however, is controversial. This review considers various aspects of the competitive interactions between lic ...
Synthesis of Conservation Plans and Strategies for
... conservation assets (i.e. ecosystems, communities or species) that collectively represent the biodiversity of a region. The explicit assumption within this process is that by conserving representative examples of broad-scale communities and ecosystems, the majority of species will also be conserved. ...
... conservation assets (i.e. ecosystems, communities or species) that collectively represent the biodiversity of a region. The explicit assumption within this process is that by conserving representative examples of broad-scale communities and ecosystems, the majority of species will also be conserved. ...
Use of live traps to capture terrestrial vertebrates policy
... What time of day will the sun fall on the traps? Animals must be removed before the sun can overheat the trap. ...
... What time of day will the sun fall on the traps? Animals must be removed before the sun can overheat the trap. ...
A Case Study in Concept Determination: Ecological Diversity.
... diversity, such as Shannon’s and Simpson’s, that make no assumption about the underlying distribution of individual organisms among species in a community. For this reason, these indices are sometimes called nonparametric (e.g. [Lande, 1996]) to distinguish them from indices derived from parameters ...
... diversity, such as Shannon’s and Simpson’s, that make no assumption about the underlying distribution of individual organisms among species in a community. For this reason, these indices are sometimes called nonparametric (e.g. [Lande, 1996]) to distinguish them from indices derived from parameters ...
Open Lands in a New England Town, Lincoln, MA: History, Ecology
... Homo sapiens have been intentionally and unintentionally caused the transformation of landscapes to various degrees. Humans arrived in North America as the ice sheet retreated, and gradually aggregated influences on the land. Native Americans used fire for facilitating agriculture, horticulture, and ...
... Homo sapiens have been intentionally and unintentionally caused the transformation of landscapes to various degrees. Humans arrived in North America as the ice sheet retreated, and gradually aggregated influences on the land. Native Americans used fire for facilitating agriculture, horticulture, and ...
Hawaii and the Pacific Islands - Hawaiian Ecosystems at Risk
... Islands more slowly than others, leaving much opportunity for the early immigrants to evolve into new roles and habitats. Beginning with only a single colonizing species, certain animal or plant groups underwent a sequence of speciation events that produced large numbers of related species that live ...
... Islands more slowly than others, leaving much opportunity for the early immigrants to evolve into new roles and habitats. Beginning with only a single colonizing species, certain animal or plant groups underwent a sequence of speciation events that produced large numbers of related species that live ...
Island restoration
The ecological restoration of islands, or island restoration, is the application of the principles of ecological restoration to islands and island groups. Islands, due to their isolation, are home to many of the world's endemic species, as well as important breeding grounds for seabirds and some marine mammals. Their ecosystems are also very vulnerable to human disturbance and particularly to introduced species, due to their small size. Island groups such as New Zealand and Hawaii have undergone substantial extinctions and losses of habitat. Since the 1950s several organisations and government agencies around the world have worked to restore islands to their original states; New Zealand has used them to hold natural populations of species that would otherwise be unable to survive in the wild. The principal components of island restoration are the removal of introduced species and the reintroduction of native species.