The Cronus hypothesis – extinction as a necessary and dynamic
... principal drivers of extinction and their synergies (Bradshaw et al. 2008; Brook et al. 2008; Field et al. 2009; Purvis et al. 2000; Sodhi et al. 2008a; Sodhi et al. 2009; Sodhi et al. 2008b), our appreciation of its complexities is still rudimentary (Brook et al. 2008; Fagan & Holmes 2006; Melbourn ...
... principal drivers of extinction and their synergies (Bradshaw et al. 2008; Brook et al. 2008; Field et al. 2009; Purvis et al. 2000; Sodhi et al. 2008a; Sodhi et al. 2009; Sodhi et al. 2008b), our appreciation of its complexities is still rudimentary (Brook et al. 2008; Fagan & Holmes 2006; Melbourn ...
Conservation and Ecosystem Powerpoint
... The most severe threats to species loss come from four general categories: Loss or degradation of habitat Introduction of non-native species Overexploitation of species Pollution ...
... The most severe threats to species loss come from four general categories: Loss or degradation of habitat Introduction of non-native species Overexploitation of species Pollution ...
pygmy rabbit petition outline
... VII. The Present or Threatened Destruction, Modification or Curtailment of Habitat and Range and Factors Affecting the Species Survival Evidence from ICBEMP and Other Sources Demonstrates the Extraordinary Loss and Degradation of Habitat Faced by the Pygmy Rabbit Upland Habitat Destruction and Alter ...
... VII. The Present or Threatened Destruction, Modification or Curtailment of Habitat and Range and Factors Affecting the Species Survival Evidence from ICBEMP and Other Sources Demonstrates the Extraordinary Loss and Degradation of Habitat Faced by the Pygmy Rabbit Upland Habitat Destruction and Alter ...
FAQs On The Monarch Butterfly Endangered Species Act
... IN DECLINE? Since historical data are scarce, we have no sure way of knowing, but anecdotal evidence suggests that monarchs were quite abundant in the 19th century. An 1850s observer of the monarch migration in the Mississippi Valley reported so many monarchs that clouds of them darkened the sky. An ...
... IN DECLINE? Since historical data are scarce, we have no sure way of knowing, but anecdotal evidence suggests that monarchs were quite abundant in the 19th century. An 1850s observer of the monarch migration in the Mississippi Valley reported so many monarchs that clouds of them darkened the sky. An ...
FAQs On The Monarch Butterfly Endangered Species Act Petition
... IN DECLINE? Since historical data are scarce, we have no sure way of knowing, but anecdotal evidence suggests that monarchs were quite abundant in the 19th century. An 1850s observer of the monarch migration in the Mississippi Valley reported so many monarchs that clouds of them darkened the sky. An ...
... IN DECLINE? Since historical data are scarce, we have no sure way of knowing, but anecdotal evidence suggests that monarchs were quite abundant in the 19th century. An 1850s observer of the monarch migration in the Mississippi Valley reported so many monarchs that clouds of them darkened the sky. An ...
Forest Management for Reptiles and Amphibians
... their interactions (Thomas 1979), trees provide the primary structure of the forest and shape the microenvironment that favors or excludes different animal and plant life (Packham et al. 1992). The most obvious influence of trees is the vertical structure they provide. In a mature forest, this str ...
... their interactions (Thomas 1979), trees provide the primary structure of the forest and shape the microenvironment that favors or excludes different animal and plant life (Packham et al. 1992). The most obvious influence of trees is the vertical structure they provide. In a mature forest, this str ...
Population Viability Analysis Annual Review of Ecology and
... heterogeneity is one of the most important mechanisms maintaining genetic variation in natural populations (63). Whether or not this pertains to the importance of inbreeding in natural populations has become the source of a fascinating debate (112, 130), but irrespective of this, there is no questio ...
... heterogeneity is one of the most important mechanisms maintaining genetic variation in natural populations (63). Whether or not this pertains to the importance of inbreeding in natural populations has become the source of a fascinating debate (112, 130), but irrespective of this, there is no questio ...
Evaluating a Method for Non-destructively Obtaining Small Volumes
... in northeast Georgia, especially in permanent water bodies. All salamanders were transported to the laboratory in a cooler of pond water, where they were placed individually into 1.9-L plastic containers filled with dechlorinated tap water and with one to two leaves (also collected from the source p ...
... in northeast Georgia, especially in permanent water bodies. All salamanders were transported to the laboratory in a cooler of pond water, where they were placed individually into 1.9-L plastic containers filled with dechlorinated tap water and with one to two leaves (also collected from the source p ...
animal behavior and conservation biology
... degree to which a population would be placed at risk by environmental change, since specialists may be more vulnerable to disturbance than generalists (Arcese et al. 1997). Nonetheless, species with highly specialized behaviors may be able to expand their repertoire when opportunity or necessity dic ...
... degree to which a population would be placed at risk by environmental change, since specialists may be more vulnerable to disturbance than generalists (Arcese et al. 1997). Nonetheless, species with highly specialized behaviors may be able to expand their repertoire when opportunity or necessity dic ...
Appendix S.9 Culliton Creek Red Legged Frog Baseline Inventory
... a) Females lay a single egg mass each year; hence, egg mass counts provide a relatively accurate assessment of the number of breeding females associated with a lentic feature; b) Egg mass surveys can be used for monitoring and research programs to estimate changes in abundance in lentic features ove ...
... a) Females lay a single egg mass each year; hence, egg mass counts provide a relatively accurate assessment of the number of breeding females associated with a lentic feature; b) Egg mass surveys can be used for monitoring and research programs to estimate changes in abundance in lentic features ove ...
Pollutants in food chains: impacts on birds
... enthusiasts concerning the losses caused by peregrine falcons preying on their birds. They were lobbying for a change in the protected status of the peregrine because they claimed that the peregrine population had greatly increased increasing their losses. As a result of this pressure, the Nature Co ...
... enthusiasts concerning the losses caused by peregrine falcons preying on their birds. They were lobbying for a change in the protected status of the peregrine because they claimed that the peregrine population had greatly increased increasing their losses. As a result of this pressure, the Nature Co ...
The inflationary effects of environmental fluctuations in
... restricted subsets of regional species pools (1). Because local communities are assembled by immigration and depleted by extinction, community structure may arise from patterns in the success and failure of population growth after immigration, driven either by interspecific interactions with residen ...
... restricted subsets of regional species pools (1). Because local communities are assembled by immigration and depleted by extinction, community structure may arise from patterns in the success and failure of population growth after immigration, driven either by interspecific interactions with residen ...
GNLCC High level Priorities 2016 DRAFT
... GNLCC. Objective was to refine upcoming FY17 funding guidance to a set of commonly shared, high priority achievable outcomes with specific objectives and science needs that will guide funding for next 5 years. The following are a summary of results to date. Advisory Team and staff recommended that G ...
... GNLCC. Objective was to refine upcoming FY17 funding guidance to a set of commonly shared, high priority achievable outcomes with specific objectives and science needs that will guide funding for next 5 years. The following are a summary of results to date. Advisory Team and staff recommended that G ...
Alaska WatchList
... remoteness provided protection for some Trumpeter Swans. In 1954, a biologist identified breeding pairs in Alaska’s Copper River Basin as Trumpeter Swans, not Tundra Swans as previously assumed. Subsequent surveys revealed more breeding trumpeters. Following strict protection from hunting and distur ...
... remoteness provided protection for some Trumpeter Swans. In 1954, a biologist identified breeding pairs in Alaska’s Copper River Basin as Trumpeter Swans, not Tundra Swans as previously assumed. Subsequent surveys revealed more breeding trumpeters. Following strict protection from hunting and distur ...
Qualitative Models of Interactions between Two Populations
... of the most aggressive invading species in the Brazilian Cerrado vegetation. This African species can cause disruptions in the invaded area, and is benefited by fire. It has been shown that after burning, Melinis occupies the space leaving out native species. However, shaded by trees like Cecropia t ...
... of the most aggressive invading species in the Brazilian Cerrado vegetation. This African species can cause disruptions in the invaded area, and is benefited by fire. It has been shown that after burning, Melinis occupies the space leaving out native species. However, shaded by trees like Cecropia t ...
Reduced flight-to-light behaviour of moth populations exposed to
... populations from some of the negative consequences of artificial light pollution [2]. Specifically, there may be less direct mortality [8,14] and lower predation risk [9,10]. Second, the lower propensity for flight-to-light in city populations suggests that the original function of this behaviour is ...
... populations from some of the negative consequences of artificial light pollution [2]. Specifically, there may be less direct mortality [8,14] and lower predation risk [9,10]. Second, the lower propensity for flight-to-light in city populations suggests that the original function of this behaviour is ...
1091-Lec19(ReintroP)
... Reintroductions: Burrowing Owl Attempt 2 - owls breed, migrate and return ...
... Reintroductions: Burrowing Owl Attempt 2 - owls breed, migrate and return ...
Trophic network models explain instability of Early Triassic terrestrial
... differed fundamentally in structure from their Permian predecessors. Additionally, our results imply that changing community structures over time may explain long-term trends like declining rates of Phanerozoic background extinction Keywords: mass extinction; end-Permian extinction; Karoo Basin; foo ...
... differed fundamentally in structure from their Permian predecessors. Additionally, our results imply that changing community structures over time may explain long-term trends like declining rates of Phanerozoic background extinction Keywords: mass extinction; end-Permian extinction; Karoo Basin; foo ...
Endemism in hostparasite interactions among island populations of
... within a specific locale or for a focal species of interest) is actually documenting whether distinct interactions among populations, especially isolated populations, exist. Parasites by virtue of their diversity and dependence on other species are embedded within every ecological network or food we ...
... within a specific locale or for a focal species of interest) is actually documenting whether distinct interactions among populations, especially isolated populations, exist. Parasites by virtue of their diversity and dependence on other species are embedded within every ecological network or food we ...
O Salamanders in a Changing Environment on Hemlock Hill Brooks Mathewson
... The eastern red-backed salamander is the only one of these that is a fully terrestrial breeder. Since amphibian eggs do not have calcareous shells, they are vulnerable to desiccation; therefore, most species deposit their eggs in aquatic environments where they pass through a gill-bearing larval sta ...
... The eastern red-backed salamander is the only one of these that is a fully terrestrial breeder. Since amphibian eggs do not have calcareous shells, they are vulnerable to desiccation; therefore, most species deposit their eggs in aquatic environments where they pass through a gill-bearing larval sta ...
The Salamanders of Tennessee
... longer be able to reach breeding ponds or interact with other populations. ...
... longer be able to reach breeding ponds or interact with other populations. ...
What Do Pesticides Really Do in the Garden?
... For example, scientists are observing important changes in hormones and reproductive systems among fish and other waterborne creatures exposed to pesticides. The two most popular pesticides, Roundup and atrazine are known to cause mutations and a serious decline in frog populations. Roundup is also ...
... For example, scientists are observing important changes in hormones and reproductive systems among fish and other waterborne creatures exposed to pesticides. The two most popular pesticides, Roundup and atrazine are known to cause mutations and a serious decline in frog populations. Roundup is also ...
Accidental experiments: ecological and evolutionary insights and
... worrying anthropogenic impacts, collectively termed global change, are often viewed as a confounding factor to minimize in basic studies and a problem to resolve or quantify in applied studies. However, these ‘accidental experiments’ also represent opportunities to gain fundamental insight into ecol ...
... worrying anthropogenic impacts, collectively termed global change, are often viewed as a confounding factor to minimize in basic studies and a problem to resolve or quantify in applied studies. However, these ‘accidental experiments’ also represent opportunities to gain fundamental insight into ecol ...
What Does the Federal Listing of Koala as Vulnerable Mean?
... Why is this only happening in a few places when there are also koalas elsewhere? The health, size and status of koala populations differ significantly across Australia. For example, koala populations on Kangaroo Island and in parts of Victoria are considered too large to be sustainable for their ha ...
... Why is this only happening in a few places when there are also koalas elsewhere? The health, size and status of koala populations differ significantly across Australia. For example, koala populations on Kangaroo Island and in parts of Victoria are considered too large to be sustainable for their ha ...
COSSARO classifications from March 24-25 and
... The Lake Sturgeon is one of the largest species of freshwater fish in Canada. It is a long-lived and late-maturing bottom-dwelling fish. These sturgeons occur widely in large lakes and rivers from the Saskatchewan River drainage in Alberta to the Hudson Bay and St. Lawrence River drainages in Quebec ...
... The Lake Sturgeon is one of the largest species of freshwater fish in Canada. It is a long-lived and late-maturing bottom-dwelling fish. These sturgeons occur widely in large lakes and rivers from the Saskatchewan River drainage in Alberta to the Hudson Bay and St. Lawrence River drainages in Quebec ...
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.