Population Dynamics of the Northern Spotted Owl
... less at sites positive effect on NSO site extinction withold good habitat Less forest higher site extinction rates Less fragmented old forest higher colonization rates ...
... less at sites positive effect on NSO site extinction withold good habitat Less forest higher site extinction rates Less fragmented old forest higher colonization rates ...
The role of metapopulations in conservation
... Issues and options Does conservation need metapopulation concepts? Animals and plants may occupy metapopulations wherever landscapes are either naturally heterogeneous, or fragmented as a result of human activities such as habitat loss to urbanization, agriculture and transportation routes. Metapopu ...
... Issues and options Does conservation need metapopulation concepts? Animals and plants may occupy metapopulations wherever landscapes are either naturally heterogeneous, or fragmented as a result of human activities such as habitat loss to urbanization, agriculture and transportation routes. Metapopu ...
Impacts of climate change on the future of biodiversity
... populations due to directional selection and rapid migration, which could in turn affect ecosystem functioning and resilience (Botkin et al. 2007 but, see Meyers & Bull 2002). However, most studies are centred on impacts at higher organisational levels, and genetic effects of climate change have bee ...
... populations due to directional selection and rapid migration, which could in turn affect ecosystem functioning and resilience (Botkin et al. 2007 but, see Meyers & Bull 2002). However, most studies are centred on impacts at higher organisational levels, and genetic effects of climate change have bee ...
Bacterial colonization and extinction on marine aggregates
... inherent equilibrium because population size continues to increase slowly due to the permanent attachment process, but that this time frame ensures a well-established, resource-limited community to be present on the aggregate for the duration of the simulation. The dynamics of the target species on ...
... inherent equilibrium because population size continues to increase slowly due to the permanent attachment process, but that this time frame ensures a well-established, resource-limited community to be present on the aggregate for the duration of the simulation. The dynamics of the target species on ...
Threats to Biodiversity - Wildlife Ecology and Conservation
... humans have had enormous impacts on the form and diversity of ecosystems. Ultimately, we have set in motion the sixth great mass extinction event in the history of the Earth—and the only one caused by a living species. Human population and consumption pressures are the root threat to biodiversity (s ...
... humans have had enormous impacts on the form and diversity of ecosystems. Ultimately, we have set in motion the sixth great mass extinction event in the history of the Earth—and the only one caused by a living species. Human population and consumption pressures are the root threat to biodiversity (s ...
Some Basic Principles of Habitat Use
... the place where it lives (Odum 1971). This simple concept of habitat is informative, but one needs to go farther when discussing habitat in relation to wildlife management. Giles (1978) presents a wildlife-habitatpeople triad that represents the three major aspects of wildlife management as equal an ...
... the place where it lives (Odum 1971). This simple concept of habitat is informative, but one needs to go farther when discussing habitat in relation to wildlife management. Giles (1978) presents a wildlife-habitatpeople triad that represents the three major aspects of wildlife management as equal an ...
Spatio-temporal community dynamics induced by frequency
... dependence). Because spatial structure in communities can have dramatic impacts on plant community dynamics (Czárán and Bartha, 1992; Herben et al., 2000), there has been an increasing recognition of the need for spatially explicit models of ecological interactions (Balzter et al., 1998; Berec, 20 ...
... dependence). Because spatial structure in communities can have dramatic impacts on plant community dynamics (Czárán and Bartha, 1992; Herben et al., 2000), there has been an increasing recognition of the need for spatially explicit models of ecological interactions (Balzter et al., 1998; Berec, 20 ...
Effects of habitat loss, habitat fragmentation, and isolation on the
... 2005). Finally, more fragmented landscapes, with more isolated fragments, may enhance at the landscape scale the coexistence of potentially competitive species in comparison to landscapes with closer fragments or unfragmented landscapes, because in the former they can segregate by inhabiting differe ...
... 2005). Finally, more fragmented landscapes, with more isolated fragments, may enhance at the landscape scale the coexistence of potentially competitive species in comparison to landscapes with closer fragments or unfragmented landscapes, because in the former they can segregate by inhabiting differe ...
Reptiles - Nevada Department of Wildlife
... Chuckwallas are strict herbivores, but may unintentonally ingest insects that are on their food plants. They appear to prefer fower heads or moist leaves; annuals are preferred over perennials (Brodie et al 2003) but they will consume both (Kwiatkowski et al 2009). Actve March through August, emergi ...
... Chuckwallas are strict herbivores, but may unintentonally ingest insects that are on their food plants. They appear to prefer fower heads or moist leaves; annuals are preferred over perennials (Brodie et al 2003) but they will consume both (Kwiatkowski et al 2009). Actve March through August, emergi ...
A swift exit - Birdlife Australia
... of a conflict that has divided communities for decades: the management of Tasmanian forests. The species became infamous in 2006 when the Federal Court of Australia ruled that forestry operations in Tasmania’s Wielangta area were likely “to have a significant impact on the Swift Parrot by reducing p ...
... of a conflict that has divided communities for decades: the management of Tasmanian forests. The species became infamous in 2006 when the Federal Court of Australia ruled that forestry operations in Tasmania’s Wielangta area were likely “to have a significant impact on the Swift Parrot by reducing p ...
Habitat Area of Particular Concern Candidate Proposal Submission
... substrate comprised of gravel/cobble and coarse sand with interspersed boulder piles and sand deposits. Benthic assemblages within the area include bryzoa, hydrozoa, anemones, calcareous worm tubes, and soft coral species that include Primnoa and Paragorgia. These structure and shelter provided by t ...
... substrate comprised of gravel/cobble and coarse sand with interspersed boulder piles and sand deposits. Benthic assemblages within the area include bryzoa, hydrozoa, anemones, calcareous worm tubes, and soft coral species that include Primnoa and Paragorgia. These structure and shelter provided by t ...
Confounding factors in the detection of species responses to habitat
... We show that confounding factors can mask many fragmentation effects. For instance, there are multiple ways in which species traits like trophic level, dispersal ability and degree of habitat specialisation influence specieslevel responses. The temporal scale of investigation may have a strong influenc ...
... We show that confounding factors can mask many fragmentation effects. For instance, there are multiple ways in which species traits like trophic level, dispersal ability and degree of habitat specialisation influence specieslevel responses. The temporal scale of investigation may have a strong influenc ...
Class Examples Habitat Management Prescription
... Resource management systems designed to produce essential commodities and other values to meet human needs and desires, and to maintain and enhance soil productivity, gene conservation, biodiversity, landscape patterns, and the array of ecological processes common to healthy ecosystems (UF SFRC 2009 ...
... Resource management systems designed to produce essential commodities and other values to meet human needs and desires, and to maintain and enhance soil productivity, gene conservation, biodiversity, landscape patterns, and the array of ecological processes common to healthy ecosystems (UF SFRC 2009 ...
Apparent predation risk: tests of habitat selection theory reveal
... competition would reveal less use of the risky patch with every reduction in the density of competitors. The increased cost of predation in the presence of competitors is real, but could not be attributed to either an increase in predator numbers or predator behaviour. I refer to such cases as ‘appa ...
... competition would reveal less use of the risky patch with every reduction in the density of competitors. The increased cost of predation in the presence of competitors is real, but could not be attributed to either an increase in predator numbers or predator behaviour. I refer to such cases as ‘appa ...
Environmental Variation, Stochastic Extinction, and Competitive
... from the evolution of individual traits (Cohen 1966; Venable and Brown 1988) to the stability of ecosystem processes (Tilman and Downing 1994; Bai et al. 2004). This basic research must now provide the foundation for understanding the ecological impacts of expected increases in climate variability. ...
... from the evolution of individual traits (Cohen 1966; Venable and Brown 1988) to the stability of ecosystem processes (Tilman and Downing 1994; Bai et al. 2004). This basic research must now provide the foundation for understanding the ecological impacts of expected increases in climate variability. ...
Are hybrid species more fit than ancestral parent species in the
... 2005b; Grigg et al., 2008). Previous studies contrasting H. anomalus morphology to that of parental species have noted likely adaptations to the active desert dune habitats such as large seeds with reserves for substantial root production, succulent leaves that may enhance water status or resist abr ...
... 2005b; Grigg et al., 2008). Previous studies contrasting H. anomalus morphology to that of parental species have noted likely adaptations to the active desert dune habitats such as large seeds with reserves for substantial root production, succulent leaves that may enhance water status or resist abr ...
Late Pleistocene Megafaunal Extinctions
... species ceased to exist, just by examining the fossil record. When the fossil bones of a given species fail to appear above a certain stratigraphic horizon in a region, we assume that this species had died out, at least in that region. However, as the old proverb says, “Absence of evidence is not ev ...
... species ceased to exist, just by examining the fossil record. When the fossil bones of a given species fail to appear above a certain stratigraphic horizon in a region, we assume that this species had died out, at least in that region. However, as the old proverb says, “Absence of evidence is not ev ...
University of Washington
... 2006). For example, humans now appropriate >50% of available freshwater run-off (Jackson et al., 2001a,b), reservoirs trap 25% of the global sediment load before it reaches the oceans (Syvitski et al., 2005), river systems have been fragmented by c. 1 million dams globally (Nilsson et al., 2005), an ...
... 2006). For example, humans now appropriate >50% of available freshwater run-off (Jackson et al., 2001a,b), reservoirs trap 25% of the global sediment load before it reaches the oceans (Syvitski et al., 2005), river systems have been fragmented by c. 1 million dams globally (Nilsson et al., 2005), an ...
Sharp-tailed Grouse - Playa Lakes Joint Venture
... manmade vertical structures, and noise in their habitat. Research has shown that lesser prairie-chickens locate their nest sites further from buildings, transmission lines, and improved roads than would be expected at random. There is also some evidence that oil and gas wellheads negatively influenc ...
... manmade vertical structures, and noise in their habitat. Research has shown that lesser prairie-chickens locate their nest sites further from buildings, transmission lines, and improved roads than would be expected at random. There is also some evidence that oil and gas wellheads negatively influenc ...
Ecological and Evolutionary Drivers of Geographic Variation in
... 1987). Jetz & Fine (2012) used biome maps to delineate 32 vertebrate bioregions (bioregions is a term used to describe biomes within continents or realms). They further investigated the accuracy of these putative bioregions to accurately describe the evolutionary arenas of vertebrates by calculating ...
... 1987). Jetz & Fine (2012) used biome maps to delineate 32 vertebrate bioregions (bioregions is a term used to describe biomes within continents or realms). They further investigated the accuracy of these putative bioregions to accurately describe the evolutionary arenas of vertebrates by calculating ...
1 BILLING CODE 3510-22-P DEPARTMENT OF
... considers the life history of the species, habitat characteristics, availability of data, particular threats, ability to predict threats, and the reliability to forecast the effects of these threats and future events on the status of the species under consideration. Because a species may be suscept ...
... considers the life history of the species, habitat characteristics, availability of data, particular threats, ability to predict threats, and the reliability to forecast the effects of these threats and future events on the status of the species under consideration. Because a species may be suscept ...
Predicting Distribution, Habitat Suitability and the Potential Loss of
... broadleaf, deciduous broadleaf and mixed forests. Core habitat (habitat suitability index > 80) was predicted for 918,000 km^ within south and southeast Asia, yet current cover type maps indicate that only 57% of this area remains forested. Potentially, as much as 270,000 km^ of this historically hi ...
... broadleaf, deciduous broadleaf and mixed forests. Core habitat (habitat suitability index > 80) was predicted for 918,000 km^ within south and southeast Asia, yet current cover type maps indicate that only 57% of this area remains forested. Potentially, as much as 270,000 km^ of this historically hi ...
Extinctions in Ecological Communities – Alva Curtsdotter
... understanding extinction processes and what determines the magnitude of species loss, has become only too relevant. The number of known extinctions (~850) during the last centuries translates to extinction rates elevated above the background rate, matching those of previous mass extinction events. T ...
... understanding extinction processes and what determines the magnitude of species loss, has become only too relevant. The number of known extinctions (~850) during the last centuries translates to extinction rates elevated above the background rate, matching those of previous mass extinction events. T ...
Models of Extinction: A Review
... of the Rhaetian stage at the end of the Triassic. In actual fact the late Triassic event killed only about half as many families as the end-Cretaceous. In order to minimize effects such as these, it has become common in studies of extinction to examine not only extinction rates (taxa becoming extinc ...
... of the Rhaetian stage at the end of the Triassic. In actual fact the late Triassic event killed only about half as many families as the end-Cretaceous. In order to minimize effects such as these, it has become common in studies of extinction to examine not only extinction rates (taxa becoming extinc ...
Models of Extinction
... of the Rhaetian stage at the end of the Triassic. In actual fact the late Triassic event killed only about half as many families as the end-Cretaceous. In order to minimize effects such as these, it has become common in studies of extinction to examine not only extinction rates (taxa becoming extinc ...
... of the Rhaetian stage at the end of the Triassic. In actual fact the late Triassic event killed only about half as many families as the end-Cretaceous. In order to minimize effects such as these, it has become common in studies of extinction to examine not only extinction rates (taxa becoming extinc ...