Puerto Rican Crested Toad - Conservation Breeding Specialist Group
... On behalf of the Fish and Wildlife Service (FWS) and the American Zoo and Aquarium Association’s (AZA) Puerto Rican Crested Toad Species Survival Plan (SSP) program, we invite you and/or members of your staff to participate in an IUCN Conservation Breeding Specialist Group (CBSG) Puerto Rican Creste ...
... On behalf of the Fish and Wildlife Service (FWS) and the American Zoo and Aquarium Association’s (AZA) Puerto Rican Crested Toad Species Survival Plan (SSP) program, we invite you and/or members of your staff to participate in an IUCN Conservation Breeding Specialist Group (CBSG) Puerto Rican Creste ...
Reef Habitats in the Middle Atlantic Bight - Mid
... and epifaunal colonization, most reef habitats have a similar appearance and function, but there can be subtle differ ences between natural and man-made reef habitats; the characteristics of each type are reviewed separately. The basic source of information on the distribu tion of reef habitats is ...
... and epifaunal colonization, most reef habitats have a similar appearance and function, but there can be subtle differ ences between natural and man-made reef habitats; the characteristics of each type are reviewed separately. The basic source of information on the distribu tion of reef habitats is ...
Conceptual issues in local adaptation
... A large body of theoretical literature is concerned with the interplay between spatially divergent selection and gene flow, and its effect on adaptive evolution. Although much of that work has been motivated by other questions (e.g. maintenance of genetic polymorphism, evolution of specialization, d ...
... A large body of theoretical literature is concerned with the interplay between spatially divergent selection and gene flow, and its effect on adaptive evolution. Although much of that work has been motivated by other questions (e.g. maintenance of genetic polymorphism, evolution of specialization, d ...
Cohort Dynamics Give Rise to Alternative Stable Community States.
... which the order of arrival may determine competitive outcome (Warren et al. 2003; Geange and Stier 2009). This may occur because species that establish early alter the environment such that species arriving later cannot successfully establish, although they would have done so if they themselves had ...
... which the order of arrival may determine competitive outcome (Warren et al. 2003; Geange and Stier 2009). This may occur because species that establish early alter the environment such that species arriving later cannot successfully establish, although they would have done so if they themselves had ...
Disturbance, Scale, and Boundary in Wilderness
... with management plans that prescribe actions that are fixed in time. This contradicts an important historic quality of natural areas which experienced considerable stochastic dynamics and directional changes in the past. In addition, nature had a certain resilience at large spatial scales. This resi ...
... with management plans that prescribe actions that are fixed in time. This contradicts an important historic quality of natural areas which experienced considerable stochastic dynamics and directional changes in the past. In addition, nature had a certain resilience at large spatial scales. This resi ...
View or download: Introduction, methods, results
... breeding on other Hawaiian Islands are also likely subject to the same threats (Mitchell et al. 2005). We also assumed that the population age structure at year one was stable because no estimate of current population demography is possible. Because the population is in decline an ...
... breeding on other Hawaiian Islands are also likely subject to the same threats (Mitchell et al. 2005). We also assumed that the population age structure at year one was stable because no estimate of current population demography is possible. Because the population is in decline an ...
Population dynamics in a cyclic environment: consequences of
... 1. Understanding which factors regulate population dynamics may help us to understand how a population would respond to environmental change, and why some populations are declining. 2. In southern Finland, vole abundance shows a three-phased cycle of low, increase and decrease phases, but these have ...
... 1. Understanding which factors regulate population dynamics may help us to understand how a population would respond to environmental change, and why some populations are declining. 2. In southern Finland, vole abundance shows a three-phased cycle of low, increase and decrease phases, but these have ...
Ecosystem engineering and biodiversity in coastal sediments
... these studies is aimed at unravelling the role of single species that are capable to mediate the environment for the entire biological community. Already, at the dawning of modern ecology, the term “EdiWcator” (Latin: aediWcator— constructor, builder) was introduced to indicate a plant species which ...
... these studies is aimed at unravelling the role of single species that are capable to mediate the environment for the entire biological community. Already, at the dawning of modern ecology, the term “EdiWcator” (Latin: aediWcator— constructor, builder) was introduced to indicate a plant species which ...
Limiting Factors and Threats to the Recovery of Steelhead in the
... The Expert Panel also had discussions on the potential impact of ocean conditions, climate change, and human population growth on steelhead population viability. The consensus of the group was that all these issues may have significant impacts on the ability to recover Mid-Columbia steelhead populat ...
... The Expert Panel also had discussions on the potential impact of ocean conditions, climate change, and human population growth on steelhead population viability. The consensus of the group was that all these issues may have significant impacts on the ability to recover Mid-Columbia steelhead populat ...
Passerine Relationships with Habitat Heterogeneity and Grazing at Multiple Scales
... starting point in detecting such relationships. Further, comparisons among the three years of bird surveys show relatively consistent trends in the relationships between grazing and avian community structure across years. This suggests that relationships in this study were overriding potential annua ...
... starting point in detecting such relationships. Further, comparisons among the three years of bird surveys show relatively consistent trends in the relationships between grazing and avian community structure across years. This suggests that relationships in this study were overriding potential annua ...
Harvest Mouse Fact Sheet
... It is believed that harvest mice are sensitive to climate change and have a preference for dry conditions1. Numbers may be limited by summer rainfall. Harvest mice originally made their nests in corn stalks but are now rarely found amongst crops. Harvest mice are more common in England, as hedgerows ...
... It is believed that harvest mice are sensitive to climate change and have a preference for dry conditions1. Numbers may be limited by summer rainfall. Harvest mice originally made their nests in corn stalks but are now rarely found amongst crops. Harvest mice are more common in England, as hedgerows ...
Habitat Selection and Indirect Interactions in Fish Communities
... 1.4 Metabolism is affected by abiotic factors Metabolism is a principal force in ecology, linking e.g. temperature to the ecology of populations and whole communities (Brown et al., 2004). As an example of different metabolic adaptions to different temperatures, salmonid fish have a higher active me ...
... 1.4 Metabolism is affected by abiotic factors Metabolism is a principal force in ecology, linking e.g. temperature to the ecology of populations and whole communities (Brown et al., 2004). As an example of different metabolic adaptions to different temperatures, salmonid fish have a higher active me ...
Geographic variation in North American gypsy moth cycles
... Abstract. Many defoliating forest lepidopterans cause predictable periodic deforestation. Several of these species exhibit geographical variation in both the strength of periodic behavior and the frequency of cycles. The mathematical models used to describe the population dynamics of such species co ...
... Abstract. Many defoliating forest lepidopterans cause predictable periodic deforestation. Several of these species exhibit geographical variation in both the strength of periodic behavior and the frequency of cycles. The mathematical models used to describe the population dynamics of such species co ...
Fragmentation in the Boreal Forest and Possible Effects on
... components of forest management planning. A key objective is to minimize adverse effects of human activities on the viability of wildlife populations in the planning area. The term “fragmentation” is often used in forest landscape management, and has come to encompass such a broad range of concepts ...
... components of forest management planning. A key objective is to minimize adverse effects of human activities on the viability of wildlife populations in the planning area. The term “fragmentation” is often used in forest landscape management, and has come to encompass such a broad range of concepts ...
Leopard (Panthera pardus) status, distribution, and the research
... delineate patch boundaries. In some cases, presence data may have been old, unverifiable, or from a transient individual, and hence could be in a region not marked as extant. We defined confirmed extant range as records not older than 3 leopard generations (21 years; Balme et al., 2013), based on th ...
... delineate patch boundaries. In some cases, presence data may have been old, unverifiable, or from a transient individual, and hence could be in a region not marked as extant. We defined confirmed extant range as records not older than 3 leopard generations (21 years; Balme et al., 2013), based on th ...
Leopard (Panthera pardus) status, distribution, and the
... delineate patch boundaries. In some cases, presence data may have been old, unverifiable, or from a transient individual, and hence could be in a region not marked as extant. We defined confirmed extant range as records not older than 3 leopard generations (21 years; Balme et al., 2013), based on th ...
... delineate patch boundaries. In some cases, presence data may have been old, unverifiable, or from a transient individual, and hence could be in a region not marked as extant. We defined confirmed extant range as records not older than 3 leopard generations (21 years; Balme et al., 2013), based on th ...
Vernal Pool Fairy Shrimp
... Habitat fragmentation can isolate and reduce population size, resulting in a process of progressive population extinction. Small or isolated populations are more susceptible to extinction from random environmental disturbance. Recolonization opportunities are also diminished when physical barriers, ...
... Habitat fragmentation can isolate and reduce population size, resulting in a process of progressive population extinction. Small or isolated populations are more susceptible to extinction from random environmental disturbance. Recolonization opportunities are also diminished when physical barriers, ...
Fulltext - Jultika
... as target species of conservation efforts (Ray 2005). Although the role of top predators in ecosystems is still not well understood, they are increasingly recognized as keystone species. Keystone species are single species that greatly affect communities but constitute only a small proportion of the ...
... as target species of conservation efforts (Ray 2005). Although the role of top predators in ecosystems is still not well understood, they are increasingly recognized as keystone species. Keystone species are single species that greatly affect communities but constitute only a small proportion of the ...
Reptile Habitat Management Handbook
... effects of habitat fragmentation. In general, they cannot cross large expanses of unsuitable terrain to move from one patch of habitat to another favourable, but distant, site. Prior to landscape modification by humans, habitats would change in suitability over time, and reptile populations themselv ...
... effects of habitat fragmentation. In general, they cannot cross large expanses of unsuitable terrain to move from one patch of habitat to another favourable, but distant, site. Prior to landscape modification by humans, habitats would change in suitability over time, and reptile populations themselv ...
Northern Harrier (Circus cyaneus): A Technical
... nest predation rates and increased competition with other predators for their primary prey items. The U.S. Fish and Wildlife Service lists the northern harrier as a species of special concern, and it is listed as a priority species in the Colorado and Wyoming Partners in Flight bird conservation pla ...
... nest predation rates and increased competition with other predators for their primary prey items. The U.S. Fish and Wildlife Service lists the northern harrier as a species of special concern, and it is listed as a priority species in the Colorado and Wyoming Partners in Flight bird conservation pla ...
predation, habitat complexity, and variation in density
... the abundance of recruits (defined as individuals ,9 cm TL for blue rockfish and ,7 cm TL for KGB) to the abundance of 1-yr-olds (10–14 cm TL for blue rockfish and 8–15 cm TL for KGB) at the same site in the next year. Although loss of juveniles could be caused by emigration, mortality, or both, I inte ...
... the abundance of recruits (defined as individuals ,9 cm TL for blue rockfish and ,7 cm TL for KGB) to the abundance of 1-yr-olds (10–14 cm TL for blue rockfish and 8–15 cm TL for KGB) at the same site in the next year. Although loss of juveniles could be caused by emigration, mortality, or both, I inte ...
TEMPORAL VARIATION IN FITNESS COMPONENTS AND
... for differences in recapture probability, because those studies minimize errors in estimates of fitness components and reduce the risk of sampling bias. Currently, however, only a handful of studies fit those criteria. We included studies lasting ≥3 years and providing yearly estimates of at least o ...
... for differences in recapture probability, because those studies minimize errors in estimates of fitness components and reduce the risk of sampling bias. Currently, however, only a handful of studies fit those criteria. We included studies lasting ≥3 years and providing yearly estimates of at least o ...
American Marten Conservation Strategy for the Huron
... timber harvest and wildfires, much of the state was deforested by the early 1900's (Brewer 1991). Human population increased from 8,765 in 1820 to 398,000 in 1850. Timber harvest peaked in 1890 and by 1897 over 162 billion board feet of timber had been cut, which amounted to about 29,100 square mile ...
... timber harvest and wildfires, much of the state was deforested by the early 1900's (Brewer 1991). Human population increased from 8,765 in 1820 to 398,000 in 1850. Timber harvest peaked in 1890 and by 1897 over 162 billion board feet of timber had been cut, which amounted to about 29,100 square mile ...
2016 Education and Training Opportunities
... Robin Russell USGS National Wildlife Health Center, Madison, WI; Dan Walsh USGS, National Wildlife Health Center, Madison, WI; Kezia Manlove, Dept. of Biology, Penn State University, State College, PA; J. Joshua Nowak, Wildlife Biology, University of Montana, Missoula, MT; Beth Ross, South ...
... Robin Russell USGS National Wildlife Health Center, Madison, WI; Dan Walsh USGS, National Wildlife Health Center, Madison, WI; Kezia Manlove, Dept. of Biology, Penn State University, State College, PA; J. Joshua Nowak, Wildlife Biology, University of Montana, Missoula, MT; Beth Ross, South ...
The coexistence of species - Revista Chilena de Historia Natural
... This paper is a critical literature review on the topic ofthe coexistence of similar species within ecological communities. A conceptual framework is provided for dividing coexistence studies and concepts into three distinct time scales. The first six sections deal primarily with ecological-scale, o ...
... This paper is a critical literature review on the topic ofthe coexistence of similar species within ecological communities. A conceptual framework is provided for dividing coexistence studies and concepts into three distinct time scales. The first six sections deal primarily with ecological-scale, o ...