Quantifying Terrestrial Habitat Loss and Fragmentation: A Protocol
... Many scientists believe that the earth is facing a mass extinction (Lawton and May 1995, Vitousek et al. 1997, Wilson 1999, Myers and Knoll 2001, Balmford et al. 2003). Current global extinction rates for animals and plants are as much as 1,000 times higher than the background rate in the fossil rec ...
... Many scientists believe that the earth is facing a mass extinction (Lawton and May 1995, Vitousek et al. 1997, Wilson 1999, Myers and Knoll 2001, Balmford et al. 2003). Current global extinction rates for animals and plants are as much as 1,000 times higher than the background rate in the fossil rec ...
Shorebird Projects in Coastal Oregon and Washington
... implementation of the regional shorebird conservation plan. The projects identified in this report were identified by working group members or other partners. Each project description related to one of four of the five overall goals described in the Northern Pacific Coast Regional Shorebird Manageme ...
... implementation of the regional shorebird conservation plan. The projects identified in this report were identified by working group members or other partners. Each project description related to one of four of the five overall goals described in the Northern Pacific Coast Regional Shorebird Manageme ...
File - Links Biology Website
... Look at a graph determine if it is exponential or logistic Describe the differences between exponential growth and logistic growth What is ecology? How much energy is lost from trophic level to trophic level? How much energy is retained? Food chain vs food web Does energy cycle or does it flow? Does ...
... Look at a graph determine if it is exponential or logistic Describe the differences between exponential growth and logistic growth What is ecology? How much energy is lost from trophic level to trophic level? How much energy is retained? Food chain vs food web Does energy cycle or does it flow? Does ...
American Woodcock: Habitat Best Management
... parcels across the landscape. Cumulatively smallerscale efforts will benefit the species and will contribute toward landscape-level goals. Landowners and land managers can use this guide to help provide some or all of the four habitat components required by woodcock on small parcels and at smaller s ...
... parcels across the landscape. Cumulatively smallerscale efforts will benefit the species and will contribute toward landscape-level goals. Landowners and land managers can use this guide to help provide some or all of the four habitat components required by woodcock on small parcels and at smaller s ...
Effect of experimental manipulation on survival and recruitment of
... age classes and sexes, almost doubling mortality resulting from hunting alone. The nearly equal population growth rates in the moderately and heavily harvested populations indicate that as annual survival was reduced, recruitment rates (which included both reproduction and immigration) increased in ...
... age classes and sexes, almost doubling mortality resulting from hunting alone. The nearly equal population growth rates in the moderately and heavily harvested populations indicate that as annual survival was reduced, recruitment rates (which included both reproduction and immigration) increased in ...
Carpet Python-(Morelia spilota metcalfei) accessible
... ‘Inclusion Body Disease’ has not yet been reported in wild populations, but represents a significant potential threat; ...
... ‘Inclusion Body Disease’ has not yet been reported in wild populations, but represents a significant potential threat; ...
RED-LEGGED FROG Rana aurora aurora
... 1998), indicating terrestrial mortality may have a considerable effect on the number of successful metamorphs leaving the wetland. While the presence of bullfrogs and exotic fish has been shown to negatively affect Red-legged Frogs in a number of ways, other factors have been found more important in ...
... 1998), indicating terrestrial mortality may have a considerable effect on the number of successful metamorphs leaving the wetland. While the presence of bullfrogs and exotic fish has been shown to negatively affect Red-legged Frogs in a number of ways, other factors have been found more important in ...
California Red-Legged Frog (Rana aurora draytonii)
... movements generally follow straight-line, point-to-point migrations rather than specific habitat corridors. Dispersal distances are believed to depend on the availability of suitable habitat and prevailing environmental conditions though very little is known about how California red-legged frogs use ...
... movements generally follow straight-line, point-to-point migrations rather than specific habitat corridors. Dispersal distances are believed to depend on the availability of suitable habitat and prevailing environmental conditions though very little is known about how California red-legged frogs use ...
MacNeil, Calum, Jaimie T. A. Dick, Mark P. Johnson, Melanie J
... With field, laboratory, and modeling approaches, we examined the interplay among habitat structure, intraguild predation (IGP), and parasitism in an ongoing species invasion. Native Gammarus duebeni celticus (Crustacea: Amphipoda) are often, but not always, replaced by the invader Gammarus pulex thr ...
... With field, laboratory, and modeling approaches, we examined the interplay among habitat structure, intraguild predation (IGP), and parasitism in an ongoing species invasion. Native Gammarus duebeni celticus (Crustacea: Amphipoda) are often, but not always, replaced by the invader Gammarus pulex thr ...
Niche Construction Theory: A Practical Guide for Ecologists
... communities and ecosystems disproportionate to their abundance, often via predation), dominant species (common species with large effects on communities and ecosystems, often via competition), and foundation and facultative species (i.e., habitat-creating species; ...
... communities and ecosystems disproportionate to their abundance, often via predation), dominant species (common species with large effects on communities and ecosystems, often via competition), and foundation and facultative species (i.e., habitat-creating species; ...
Slow motion extinction: inbreeding, introgression, and loss in the
... population (*80–100 individuals) is far below levels 100 years ago, with only about half of the allelic diversity retained. Current genetic diversity is close to levels in the Fernandina population that went extinct by the 1970s. Bottleneck analysis did not show a strong signature of recent decline, ...
... population (*80–100 individuals) is far below levels 100 years ago, with only about half of the allelic diversity retained. Current genetic diversity is close to levels in the Fernandina population that went extinct by the 1970s. Bottleneck analysis did not show a strong signature of recent decline, ...
Great Blue Heron fannini subspecies
... primarily using measures of nesting productivity, annual changes in colony occupancy (active nest counts), and various population indices. The following information is from COSEWIC (2008), with updated analyses, where available. Productivity trends Nesting productivity (number of chicks fledged per ...
... primarily using measures of nesting productivity, annual changes in colony occupancy (active nest counts), and various population indices. The following information is from COSEWIC (2008), with updated analyses, where available. Productivity trends Nesting productivity (number of chicks fledged per ...
Inverse density dependence and the Allee effect
... At the other extreme of sociality are individuals of species whose only form of contact with conspecifics is for sexual reproduction (which can in this context be considered as proto-cooperation). They can also be subject to Allee effects. For example, pollination of many species of plants (especial ...
... At the other extreme of sociality are individuals of species whose only form of contact with conspecifics is for sexual reproduction (which can in this context be considered as proto-cooperation). They can also be subject to Allee effects. For example, pollination of many species of plants (especial ...
Positive Assortment through Environmental Feedback.
... Given the crucial role of assortment, the question of how it can arise becomes central. In his early publications, Hamilton (1964) focused solely on genetic similarity through common descent. For this reason, Maynard Smith (1964) renamed inclusive fitness as “kin selection.” But according to Hamilto ...
... Given the crucial role of assortment, the question of how it can arise becomes central. In his early publications, Hamilton (1964) focused solely on genetic similarity through common descent. For this reason, Maynard Smith (1964) renamed inclusive fitness as “kin selection.” But according to Hamilto ...
Predator control allows critically endangered lizards to recover on
... For consistency, and to maximise the probability of seeing skinks, we carried out photo–resight surveys in warm sunny conditions with low wind strength (as in Roughton 2005). Surveyors attempted to photograph both lateral sides of all visible skinks, with a preference for the nose to foreleg region, ...
... For consistency, and to maximise the probability of seeing skinks, we carried out photo–resight surveys in warm sunny conditions with low wind strength (as in Roughton 2005). Surveyors attempted to photograph both lateral sides of all visible skinks, with a preference for the nose to foreleg region, ...
On chaos, transient chaos and ghosts in single population models
... could consume almost the whole population of adult cicadas in their summer decline, but their consumption was lower for much larger population densities. In addition, some other studies about predation on bird eggs and nestlings [21] as well as predation on fish species [22], showed that increasing ...
... could consume almost the whole population of adult cicadas in their summer decline, but their consumption was lower for much larger population densities. In addition, some other studies about predation on bird eggs and nestlings [21] as well as predation on fish species [22], showed that increasing ...
Limitation of population recovery - Cooperative Institute for the North
... growth rates (Gardmark et al. 2003). To the extent that the population is recovering from a decline, density-dependent factors may be unimportant (unless, perhaps, the decline has been severe enough to trigger an Allee effect), which allows linear demographic analysis to be applied in a powerful fas ...
... growth rates (Gardmark et al. 2003). To the extent that the population is recovering from a decline, density-dependent factors may be unimportant (unless, perhaps, the decline has been severe enough to trigger an Allee effect), which allows linear demographic analysis to be applied in a powerful fas ...
wetlands wetlands
... to 300 feet); however, the method of determining buffer widths would change. Under current regulations, wetland buffer widths are fixed based on the general type of wetland and the intensity of the proposed land use. The potential amendments would determine buffer widths based on distances required ...
... to 300 feet); however, the method of determining buffer widths would change. Under current regulations, wetland buffer widths are fixed based on the general type of wetland and the intensity of the proposed land use. The potential amendments would determine buffer widths based on distances required ...
Fragoso 2005 Trophic strucure tropics
... These bruchid beetles specialize on Attalea seeds, although they are not confined to the genus (Delobelle et al. 1995; Silvius 1999). They appear to be the dominant representatives of the herbivorous trophic level supported directly by Attalea fruits and seeds (Fragoso 1997a; Fragoso et al. 2003; Si ...
... These bruchid beetles specialize on Attalea seeds, although they are not confined to the genus (Delobelle et al. 1995; Silvius 1999). They appear to be the dominant representatives of the herbivorous trophic level supported directly by Attalea fruits and seeds (Fragoso 1997a; Fragoso et al. 2003; Si ...
Conceptual Ecological Modelling of Shallow Sublittoral Sand
... factors such as natural variation (e.g. seasonal/annual), prevailing conditions and connectivity with other habitats. Species composition within the biotopes, detailing species of conservation importance, key characterising taxa, those which provide specific functions, as well as their associated sp ...
... factors such as natural variation (e.g. seasonal/annual), prevailing conditions and connectivity with other habitats. Species composition within the biotopes, detailing species of conservation importance, key characterising taxa, those which provide specific functions, as well as their associated sp ...
Ocelot CH Petition - WildEarth Guardians
... in the U.S. portion of its range, but the Ocelot has not recovered. Indeed, its current population levels are approximately the same in the U.S. as when this animal was listed in 1982: 50 or fewer Ocelots occur in the U.S. Research has shown that critical habitat is effective in promoting recovery o ...
... in the U.S. portion of its range, but the Ocelot has not recovered. Indeed, its current population levels are approximately the same in the U.S. as when this animal was listed in 1982: 50 or fewer Ocelots occur in the U.S. Research has shown that critical habitat is effective in promoting recovery o ...
Western harvest mouse (Reithrodontomys megalotis)
... and build small grass nests on the ground or up to 1 m above ground in shrubs. Females can breed at the age of four months and may have up to five litters per season ...
... and build small grass nests on the ground or up to 1 m above ground in shrubs. Females can breed at the age of four months and may have up to five litters per season ...
Assessing the ecological significance of linkage and connectivity for
... the key habitat features that dictate the distribution and abundance of avian populations it is possible to inform planning policy to maximise biodiversity. Bird species presence and abundance across an urban gradient in Birmingham (UK) was surveyed at 70 sites over three sampling periods (between 2 ...
... the key habitat features that dictate the distribution and abundance of avian populations it is possible to inform planning policy to maximise biodiversity. Bird species presence and abundance across an urban gradient in Birmingham (UK) was surveyed at 70 sites over three sampling periods (between 2 ...
Seed Dispersal by Brown Bears, Ursus arctos, in Southeastern Alaska
... landscape (Patten 1993), defecations by a moving bear can spread multiple deposits of a single defecation over several meters, which could be ecologically important. A survey of 1163 “scat trails” revealed that 42% were multiple deposits, with 3% of them comprised of over 20 separate droppings sprea ...
... landscape (Patten 1993), defecations by a moving bear can spread multiple deposits of a single defecation over several meters, which could be ecologically important. A survey of 1163 “scat trails” revealed that 42% were multiple deposits, with 3% of them comprised of over 20 separate droppings sprea ...
042909.Engleberg-Carruthers.Protozoa
... Author(s): Vernon Carruthers, Ph.D., Cary Engleberg, M.D., D.T.M.&H., 2009 License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution 3.0 License: http://creativecommons.org/licenses/by/3.0/ ...
... Author(s): Vernon Carruthers, Ph.D., Cary Engleberg, M.D., D.T.M.&H., 2009 License: Unless otherwise noted, this material is made available under the terms of the Creative Commons Attribution 3.0 License: http://creativecommons.org/licenses/by/3.0/ ...