to view - Scottish Natural Heritage
... Very little information exists for the bivalves present in this community, with no information available regarding population densities or Minimum Viable Populations. There are also only a few locations where this search feature is known within Scotland. In most known instances (e.g. Malthus et al., ...
... Very little information exists for the bivalves present in this community, with no information available regarding population densities or Minimum Viable Populations. There are also only a few locations where this search feature is known within Scotland. In most known instances (e.g. Malthus et al., ...
Biodiversity: Patterns, Processes, Loss and Value
... “new” species. In fact, the rate of collection of these organisms greatly outpaces the ability of specialists to name, describe, and catalog them (approximately 15,000/ year, Stork 1997). In addition, there is considerable variability with respect to degree in which various groups of organisms are k ...
... “new” species. In fact, the rate of collection of these organisms greatly outpaces the ability of specialists to name, describe, and catalog them (approximately 15,000/ year, Stork 1997). In addition, there is considerable variability with respect to degree in which various groups of organisms are k ...
here - Gerroa Environmental Protection Society
... The Seven Mile Beach National Park, together with adjoining native vegetation on private lands, forms a vulnerable, disconnected island of vegetation. Clearing, fragmentation of vegetation and loss of habitat has been a contentious issue over the last 30 years. Historically urban development ha ...
... The Seven Mile Beach National Park, together with adjoining native vegetation on private lands, forms a vulnerable, disconnected island of vegetation. Clearing, fragmentation of vegetation and loss of habitat has been a contentious issue over the last 30 years. Historically urban development ha ...
Lost Dogs, Last Birds, and Listed Species: Cultures of Extinction
... to the emergence of new species, and usually occurs at the so-called background level, roughly one species going extinct every four years. But currently, biologists estimate that we may be losing species at about 50 to 500 times the background level. If one adds to this figure species that may have ...
... to the emergence of new species, and usually occurs at the so-called background level, roughly one species going extinct every four years. But currently, biologists estimate that we may be losing species at about 50 to 500 times the background level. If one adds to this figure species that may have ...
Habitat and Niche
... niches, which can overlap, but there must be distinct differences between any two niches. When plants and animals are introduced, either intentionally or by accident, into a new environment, they can occupy the existing niches of native organisms. Sometimes new species out-compete native species, an ...
... niches, which can overlap, but there must be distinct differences between any two niches. When plants and animals are introduced, either intentionally or by accident, into a new environment, they can occupy the existing niches of native organisms. Sometimes new species out-compete native species, an ...
PPT Ch5 Population Ecology
... survivorship curve because very few survive the younger years, but after a certain age, individuals are much more likely to survive. ...
... survivorship curve because very few survive the younger years, but after a certain age, individuals are much more likely to survive. ...
modeling the role of primary productivity disruption in end
... warming caused by Siberian flood basalt volcanism (Bowring et al., 1998; Wignall, 2001), but none is supported by conclusive evidence. The uncertainty surrounding the trigger for the end-Permian event reflects the fact that very few unique mechanisms have been associated definitively with mass extin ...
... warming caused by Siberian flood basalt volcanism (Bowring et al., 1998; Wignall, 2001), but none is supported by conclusive evidence. The uncertainty surrounding the trigger for the end-Permian event reflects the fact that very few unique mechanisms have been associated definitively with mass extin ...
Flinders Ranges Purple-spotted Gudgeon
... Ranges in rocky stream habitat areas that are maintained by springs thought to come from local rock aquifers. In other areas of the Flinders Ranges they can be found in isolated water holes along rocky creeks. They can only move to new areas during flooding events. They prefer slow flowing to still ...
... Ranges in rocky stream habitat areas that are maintained by springs thought to come from local rock aquifers. In other areas of the Flinders Ranges they can be found in isolated water holes along rocky creeks. They can only move to new areas during flooding events. They prefer slow flowing to still ...
maintain existing and credited habitat values
... #5. Species play a key role in developing and maintaining ecological conditions. Each species has one or more ecological functions that may be key to the development and maintenance of ecological conditions. Species, in effect, have a distinct job or occupation that is essential to the structure, su ...
... #5. Species play a key role in developing and maintaining ecological conditions. Each species has one or more ecological functions that may be key to the development and maintenance of ecological conditions. Species, in effect, have a distinct job or occupation that is essential to the structure, su ...
Trophic network models explain instability of Early Triassic terrestrial
... important sources of uncertainty in our knowledge of actual food webs, as well as their temporal and spatial variability. First, the exact number of trophic interactions that any fossil species would have possessed or the particular species with which it interacted cannot be known, even though we ha ...
... important sources of uncertainty in our knowledge of actual food webs, as well as their temporal and spatial variability. First, the exact number of trophic interactions that any fossil species would have possessed or the particular species with which it interacted cannot be known, even though we ha ...
Community stability and selective extinction during Earth`s
... Introduction Anthropogenically-driven global biological change is predicted to have dramatic negative effects on Earth’s ecosystems over the next centuries. Since the end of the last glaciation, climate change and the significant increase of human impacts on ecological systems have driven enough spe ...
... Introduction Anthropogenically-driven global biological change is predicted to have dramatic negative effects on Earth’s ecosystems over the next centuries. Since the end of the last glaciation, climate change and the significant increase of human impacts on ecological systems have driven enough spe ...
Diversity, invasive species and extinctions in insular ecosystems
... 3. A number of factors that were hypothesized a priori to explain the observed extinction patterns performed better than island size alone. Alternative prey available to invasive predators was negatively correlated with extinction, with twice the number of alternative prey species present on extinct ...
... 3. A number of factors that were hypothesized a priori to explain the observed extinction patterns performed better than island size alone. Alternative prey available to invasive predators was negatively correlated with extinction, with twice the number of alternative prey species present on extinct ...
Recovery Strategies Backgrounder (PDF 444KB)
... The Garry Oak Ecosystems Recovery Team (GOERT) was formed in 1999 to coordinate efforts to save endangered Garry oak and associated ecosystems and the species that inhabit them. GOERT prepared an umbrella strategy for the recovery of Garry oak and associated ecosystems and their associated species a ...
... The Garry Oak Ecosystems Recovery Team (GOERT) was formed in 1999 to coordinate efforts to save endangered Garry oak and associated ecosystems and the species that inhabit them. GOERT prepared an umbrella strategy for the recovery of Garry oak and associated ecosystems and their associated species a ...
Species traits explaining sensitivity of snakes to human land use
... For most taxa, habitat loss is the primary threat driving their imperilment (Sala et al., 2000). However, the degree to which species are imperiled by habitat loss varies depending on their life histories and other traits. For example, species with small ranges, narrow niche breadths, and those at h ...
... For most taxa, habitat loss is the primary threat driving their imperilment (Sala et al., 2000). However, the degree to which species are imperiled by habitat loss varies depending on their life histories and other traits. For example, species with small ranges, narrow niche breadths, and those at h ...
File - Oxford Megafauna conference
... archaeological remains. Contemporaneously, Nothofagus increased relative to grass, and other vegetation changes also occurred, as indicated by pollen from Mylodon dung and peat cores. Fire frequency increased near the same time, glaciers retreated relatively quickly, and temperature warmed in the vi ...
... archaeological remains. Contemporaneously, Nothofagus increased relative to grass, and other vegetation changes also occurred, as indicated by pollen from Mylodon dung and peat cores. Fire frequency increased near the same time, glaciers retreated relatively quickly, and temperature warmed in the vi ...
Cretaceous Period 2 Cretaceous Period 3
... – Mid to high latitude vegetation changed dramatically from broadleaf evergreen rain forest to deciduous forests • Remnant primates forced to cluster into smaller habitable forest areas near the equator (Fayum) • Increased competition probably drove some changes in behavior and adaptive patterns ...
... – Mid to high latitude vegetation changed dramatically from broadleaf evergreen rain forest to deciduous forests • Remnant primates forced to cluster into smaller habitable forest areas near the equator (Fayum) • Increased competition probably drove some changes in behavior and adaptive patterns ...
Modeling Biodiversity Dynamics in Countryside and Native Habitats
... Ranganathan et al., 2008). Another important issue is that global land-use change dynamics are increasingly complex. While forest loss continues to occur in tropical forests and subtropical woodlands, some regions of the world are seeing an expansion of forest trough natural vegetation regeneration ...
... Ranganathan et al., 2008). Another important issue is that global land-use change dynamics are increasingly complex. While forest loss continues to occur in tropical forests and subtropical woodlands, some regions of the world are seeing an expansion of forest trough natural vegetation regeneration ...
Insects and the city: what island biogeography tells us about insect
... spaces, even if unable to sustain a stable population of a given species, may sustain individuals that are dispersing towards more suitable areas. Web Ecol., 16, 41–45, 2016 ...
... spaces, even if unable to sustain a stable population of a given species, may sustain individuals that are dispersing towards more suitable areas. Web Ecol., 16, 41–45, 2016 ...
Multitrophic Diversity Effects Of Network Degradation
... to disease spread, nutrient cycling, and others (Gamfeldt et al. 2008). These functions are perhaps more realistically represented by metrics that incorporate the functional contribution of both trophic levels, such as the proportion of prey taken by predators, or the percentage of flowers produced ...
... to disease spread, nutrient cycling, and others (Gamfeldt et al. 2008). These functions are perhaps more realistically represented by metrics that incorporate the functional contribution of both trophic levels, such as the proportion of prey taken by predators, or the percentage of flowers produced ...
How many bird extinctions have we prevented?
... To identify those species for which conservation may have prevented extinction during 1994–2004 we drew up a list of candidates by examining information on all 168 species classified as Critically Endangered in 1994, plus 73 species that would have qualified had current information been available th ...
... To identify those species for which conservation may have prevented extinction during 1994–2004 we drew up a list of candidates by examining information on all 168 species classified as Critically Endangered in 1994, plus 73 species that would have qualified had current information been available th ...
i3157e02
... threaten biodiversity in their new area, are a major cause of biodiversity loss. These species are harmful to native biodiversity in a number of ways, for example as predators, parasites, vectors (or carriers) of disease or direct competitors for habitat and food. In many cases invasive alien specie ...
... threaten biodiversity in their new area, are a major cause of biodiversity loss. These species are harmful to native biodiversity in a number of ways, for example as predators, parasites, vectors (or carriers) of disease or direct competitors for habitat and food. In many cases invasive alien specie ...
AND Gehyra variegata) IN REMNANT HABITAT
... the remnant and is a function of processes operating at the population level rather than on a regional basis. PitfalI trapping in this study and evidence from another long-term study suggest that the movement of 0. reticulata between remnants is negligible. As a consequence, this species has been un ...
... the remnant and is a function of processes operating at the population level rather than on a regional basis. PitfalI trapping in this study and evidence from another long-term study suggest that the movement of 0. reticulata between remnants is negligible. As a consequence, this species has been un ...
aspects of habitat of particular concern for fish population dynamics
... make spatial habitat characteristics implicit in order to develop time series of seasonal to inter-annual changes in ocean structure likely to affect important life history processes at the spatial extent of whole populations. In contrast, tactical ecosystem management, which currently emphasizes sp ...
... make spatial habitat characteristics implicit in order to develop time series of seasonal to inter-annual changes in ocean structure likely to affect important life history processes at the spatial extent of whole populations. In contrast, tactical ecosystem management, which currently emphasizes sp ...
Allee effects, extinctions, and chaotic transients in simple population
... point C: To distinguish between the cases of bistability and essential extinction, we numerically compute bifurcation diagrams by determining the fate of the unique critical point C (see Figs. 3a and b). These diagrams show for slow growing populations, bistability occurs at intermediate values of m ...
... point C: To distinguish between the cases of bistability and essential extinction, we numerically compute bifurcation diagrams by determining the fate of the unique critical point C (see Figs. 3a and b). These diagrams show for slow growing populations, bistability occurs at intermediate values of m ...
Habitat Loss, Degradation, and Fragmentation
... pronounced edge effects (influences created at the boundary between habitats) • Fragmented landscapes in summary create conditions by which species have not typically evolutionarily adapted ...
... pronounced edge effects (influences created at the boundary between habitats) • Fragmented landscapes in summary create conditions by which species have not typically evolutionarily adapted ...