Chapter 11
... comprised a larger proportion of the diet of Grasshopper Buzzards in natural than transformed habitat (Chapter 4). This reflected greater rodent availability in natural habitat, which contributed to denser nest spacing, suggesting rodents were an important determinant of habitat quality for Grasshop ...
... comprised a larger proportion of the diet of Grasshopper Buzzards in natural than transformed habitat (Chapter 4). This reflected greater rodent availability in natural habitat, which contributed to denser nest spacing, suggesting rodents were an important determinant of habitat quality for Grasshop ...
Weighting and indirect effects identify keystone species in food webs
... to various extinction scenarios. Link weight and/or indirect effects had stronger effects on foodweb stability than the simple removal of ‘hubs’, demonstrating that both quantitative fluxes and species dissipating their effects across many links should be of great concern in biodiversity conservatio ...
... to various extinction scenarios. Link weight and/or indirect effects had stronger effects on foodweb stability than the simple removal of ‘hubs’, demonstrating that both quantitative fluxes and species dissipating their effects across many links should be of great concern in biodiversity conservatio ...
56_Lecture_Presentation
... Preserving Biodiversity Hot Spots • A biodiversity hot spot is a relatively small area with a great concentration of endemic species and many endangered and threatened species • Biodiversity hot spots are good choices for nature reserves, but identifying them is not ...
... Preserving Biodiversity Hot Spots • A biodiversity hot spot is a relatively small area with a great concentration of endemic species and many endangered and threatened species • Biodiversity hot spots are good choices for nature reserves, but identifying them is not ...
Genetic consequences of ecological reserve design guidelines: An
... amount of diversity included in reserve networks was also compared with an accepted standard for genetic diversity conservation developed by the Center for Plant Conservation (1991) that recommends having a 90–95% probability of including all common alleles. As such, this research contributes both t ...
... amount of diversity included in reserve networks was also compared with an accepted standard for genetic diversity conservation developed by the Center for Plant Conservation (1991) that recommends having a 90–95% probability of including all common alleles. As such, this research contributes both t ...
Endemic predators, invasive prey and native diversity
... preference of many toads, there may be a general potential for bufonids as biocontrol agents; this is an area in need of further research. Intuitively, toads can only provide useful ecosystem services if they are abundant; yet (endemic) amphibians are the most threatened vertebrates on the planet [2 ...
... preference of many toads, there may be a general potential for bufonids as biocontrol agents; this is an area in need of further research. Intuitively, toads can only provide useful ecosystem services if they are abundant; yet (endemic) amphibians are the most threatened vertebrates on the planet [2 ...
Ecological communities in variable environments : dynamics
... In multi-species communities, each species has its specific response to environmental stochasticity. Species-specific environmental responses can be either independent (IR), uniformly correlated (CR), or hierarchically correlated (HR) between species. IR refers to a situation where each species resp ...
... In multi-species communities, each species has its specific response to environmental stochasticity. Species-specific environmental responses can be either independent (IR), uniformly correlated (CR), or hierarchically correlated (HR) between species. IR refers to a situation where each species resp ...
Ecological Assessment of Selenium in the Aquatic Environment
... •• A single, universal, dissolved water quality value is inappropriate for predicting toxicity. The dissolved Se concentration benchmark that is necessary to protect one site may be either insufficiently protective or unnecessarily protective at another site. •• There is consensus that fish and bird ...
... •• A single, universal, dissolved water quality value is inappropriate for predicting toxicity. The dissolved Se concentration benchmark that is necessary to protect one site may be either insufficiently protective or unnecessarily protective at another site. •• There is consensus that fish and bird ...
Sapo gigante (Rhinella marina)
... these toads have undergone a population explosion. They have established widespread ranges in these non-native areas and attain higher densities in Australia than they do in their native range (Lampo and De Leo 1998). This has caused much concern about the effects of B. marinus on native anuran spec ...
... these toads have undergone a population explosion. They have established widespread ranges in these non-native areas and attain higher densities in Australia than they do in their native range (Lampo and De Leo 1998). This has caused much concern about the effects of B. marinus on native anuran spec ...
Gray Ratsnake (Elaphe spiloides) - Registre public des espèces en
... estimates, the Great Lakes/St. Lawrence population has been estimated to contain between 25 000 – 85 000 individuals. Although no population-wide census information is available, 2 populations on the Frontenac Axis were shown to be declining slightly over an 18-year period. No demographic sampling h ...
... estimates, the Great Lakes/St. Lawrence population has been estimated to contain between 25 000 – 85 000 individuals. Although no population-wide census information is available, 2 populations on the Frontenac Axis were shown to be declining slightly over an 18-year period. No demographic sampling h ...
Biodiversity and Management of Natural Resources
... the remoteness and difficulty of monitoring marine habitats. However, the principal factor responsible for lack of scientific and public awareness may be related to the dichotomy between terrestrial and aquatic species-between large, furry, warm-blooded animals (living on the land with humans) and s ...
... the remoteness and difficulty of monitoring marine habitats. However, the principal factor responsible for lack of scientific and public awareness may be related to the dichotomy between terrestrial and aquatic species-between large, furry, warm-blooded animals (living on the land with humans) and s ...
Predictors of species sensitivity to fragmentation
... traits; rarity; and biogeographic position. For each trait we discuss the theoretical justification for its sensitivity to fragmentation and empirical evidence for and against the suitability of the trait as a predictor of fragmentation sensitivity. Where relevant, we also discuss experimental desig ...
... traits; rarity; and biogeographic position. For each trait we discuss the theoretical justification for its sensitivity to fragmentation and empirical evidence for and against the suitability of the trait as a predictor of fragmentation sensitivity. Where relevant, we also discuss experimental desig ...
Full-Text PDF
... was in the early to mid-20th century [15]. Climate change has already influenced Speyeria populations as well as populations of violets, and these changes can affect population performance, especially in marginally suitable environments [65]. S. diana, and many other insects, have responded to clima ...
... was in the early to mid-20th century [15]. Climate change has already influenced Speyeria populations as well as populations of violets, and these changes can affect population performance, especially in marginally suitable environments [65]. S. diana, and many other insects, have responded to clima ...
Northern California coast summer steelhead
... extinction of the summer steelhead portion is particularly high. Only the Middle Fork Eel population seems likely to remain viable beyond the next 25 years. However, adequate ...
... extinction of the summer steelhead portion is particularly high. Only the Middle Fork Eel population seems likely to remain viable beyond the next 25 years. However, adequate ...
Indexically Structured Ecological Communities Abstract. Ecological
... compared to their occasional prey, Greater Gliders. Individual Quolls roam over home ranges up to 3500 hectares moving between habitat fragments via wildlife corridors, while a Glider’s home range is only 2 hectares and is locked within a local habitat fragment. Unless there is a very strong counter ...
... compared to their occasional prey, Greater Gliders. Individual Quolls roam over home ranges up to 3500 hectares moving between habitat fragments via wildlife corridors, while a Glider’s home range is only 2 hectares and is locked within a local habitat fragment. Unless there is a very strong counter ...
INTERIM RECOVERY PLAN NO - Department of Parks and Wildlife
... DEC is committed to ensuring that Threatened taxa are conserved through the preparation and implementation of Recovery Plans (RPs) or IRPs, and by ensuring that conservation action commences as soon as possible and, in the case of Critically Endangered (CR) taxa, always within one year of endorsemen ...
... DEC is committed to ensuring that Threatened taxa are conserved through the preparation and implementation of Recovery Plans (RPs) or IRPs, and by ensuring that conservation action commences as soon as possible and, in the case of Critically Endangered (CR) taxa, always within one year of endorsemen ...
Paiute Plan - Living Assessment
... limited. They are thought to have existed in only 14.7 kilometers of habitat from the base of Llewellyn Falls downstream to Silver King Canyon and including three small tributary creeks in the drainage, Tamarack Creek, Tamarack Lake Creek, and the lower reaches of Coyote Valley Creek downstream of b ...
... limited. They are thought to have existed in only 14.7 kilometers of habitat from the base of Llewellyn Falls downstream to Silver King Canyon and including three small tributary creeks in the drainage, Tamarack Creek, Tamarack Lake Creek, and the lower reaches of Coyote Valley Creek downstream of b ...
Eastern Foxsnake (Elaphe gloydi) - Registre public des espèces en
... The species was considered a single unit and designated Threatened in April 1999 and May 2000. Split into two populations in April 2008. The Great Lakes / St. Lawrence population was designated Endangered in April 2008. Last assessment based on an update status report. ...
... The species was considered a single unit and designated Threatened in April 1999 and May 2000. Split into two populations in April 2008. The Great Lakes / St. Lawrence population was designated Endangered in April 2008. Last assessment based on an update status report. ...
Ecological impacts of invasive cane toads
... northeastern Queensland. They have since spread westwards (through Queensland, the Northern Territory, and into Western Australia) and southwards (into NSW). Concern about the toads’ impacts on wildlife spawned predictions that most native species encountering toads would be severely affected, and t ...
... northeastern Queensland. They have since spread westwards (through Queensland, the Northern Territory, and into Western Australia) and southwards (into NSW). Concern about the toads’ impacts on wildlife spawned predictions that most native species encountering toads would be severely affected, and t ...
Chapter 1. Threats to freshwater biodiversity globally and in
... connected to – or isolated from – each other, with abilities to disperse through networks that depend on the vagaries of confluence patterns, stream gradients, or the presence of barriers such as waterfalls. Geographic distance may appropriately reflect the degree of isolation among terrestrial habi ...
... connected to – or isolated from – each other, with abilities to disperse through networks that depend on the vagaries of confluence patterns, stream gradients, or the presence of barriers such as waterfalls. Geographic distance may appropriately reflect the degree of isolation among terrestrial habi ...
African Herp News 58, December 2012
... reinstatement of Phrynomerus as the only genus in an exclusively African subfamily Phrynomerinae. The family is represented in Ethiopia by Phrynomerus somalicus and the endemic genus and species Balebreviceps hillmani. The 13 species of Ptychadena include at least six endemic species on the Ethiopia ...
... reinstatement of Phrynomerus as the only genus in an exclusively African subfamily Phrynomerinae. The family is represented in Ethiopia by Phrynomerus somalicus and the endemic genus and species Balebreviceps hillmani. The 13 species of Ptychadena include at least six endemic species on the Ethiopia ...
Intraspecific trait variation and colonization sequence alter
... 2002, Dibble et al. 2014). Previous studies indicate that IPEs can maintain long-term variation among populations in a landscape (Ventura et al. 2014), as early colonists resist subsequent immigration and the homogenizing effects of dispersal (Boileau et al. 1992, De Meester et al. 2002, Haag et al ...
... 2002, Dibble et al. 2014). Previous studies indicate that IPEs can maintain long-term variation among populations in a landscape (Ventura et al. 2014), as early colonists resist subsequent immigration and the homogenizing effects of dispersal (Boileau et al. 1992, De Meester et al. 2002, Haag et al ...
Indirect Effects in - Department of Knowledge Technologies
... Global climate change (principally related to the increased concentrations of greenhouse gases) is still one of the most discussed topics in ecology and environmental sciences in ...
... Global climate change (principally related to the increased concentrations of greenhouse gases) is still one of the most discussed topics in ecology and environmental sciences in ...
The Extinction of the Glaucus Macaw
... the end of the 18th century as they are today. For example collecting for the international pet trade that threatens modern populations of Hyacinth and Lear's Macaws would have been much less prevalence. The wide scale habitat clearing that is threatening so many parrots was also much less widesprea ...
... the end of the 18th century as they are today. For example collecting for the international pet trade that threatens modern populations of Hyacinth and Lear's Macaws would have been much less prevalence. The wide scale habitat clearing that is threatening so many parrots was also much less widesprea ...
Decline in amphibian populations
Since the 1980s, declines in amphibian populations, including population crashes and mass localized extinctions, have been noted from locations all over the world. These declines are perceived as one of the most critical threats to global biodiversity, and several causes are believed to be involved, including disease, habitat destruction and modification, exploitation, pollution, pesticide use, introduced species, and ultraviolet-B radiation (UV-B). However, many of the causes of amphibian declines are still poorly understood, and the topic is currently a subject of much ongoing research. Calculations based on extinction rates suggest that the current extinction rate of amphibians could be 211 times greater than the background extinction rate and the estimate goes up to 25,000–45,000 times if endangered species are also included in the computation.