2009 Review Sheet - University of Arizona | Ecology and
... 56. What are the five major threats to biodiversity? Do they often act in concert? 57. What is the evidence for global climate change? 58. Which part of the planet will heat up faster? What is expected to happen to Polar Bear populations? 59. How does understanding phenology help us comprehend the p ...
... 56. What are the five major threats to biodiversity? Do they often act in concert? 57. What is the evidence for global climate change? 58. Which part of the planet will heat up faster? What is expected to happen to Polar Bear populations? 59. How does understanding phenology help us comprehend the p ...
Conservation Easements - Natural Resources Class 2013
... • larger blocks might otherwise be beyond dispersal distance • may increase local population ...
... • larger blocks might otherwise be beyond dispersal distance • may increase local population ...
NotesChapter7
... Barbault and Sastrapradja 1995, Wikipedia Contributors 2006b). It may be described as a ‘population of populations’ with two levels of population dynamics: within local populations and between local populations (Begon et al. 1996, Primack 1998). Plants tend to occur in metapopulations (Frankel et al ...
... Barbault and Sastrapradja 1995, Wikipedia Contributors 2006b). It may be described as a ‘population of populations’ with two levels of population dynamics: within local populations and between local populations (Begon et al. 1996, Primack 1998). Plants tend to occur in metapopulations (Frankel et al ...
NotesChapter7
... Extinction mechanisms act by raising the mortality rate, lowering the birth rate (Barbault & Sastrapradja 1995, Dobson 1996), lowering the migration rate or any combination of the three. The mechanisms may be grouped into three categories for single populations (Barbault & Sastrapradja 1995). Firstl ...
... Extinction mechanisms act by raising the mortality rate, lowering the birth rate (Barbault & Sastrapradja 1995, Dobson 1996), lowering the migration rate or any combination of the three. The mechanisms may be grouped into three categories for single populations (Barbault & Sastrapradja 1995). Firstl ...
Robustness of metacommunities with omnivory to habitat destruction
... Pillai et al. (2010) by accounting for species differences in dispersal range (Appendix S1). Using numerical solutions of this system, we investigate how habitat loss, fragmentation and the combination of both affect species persistence. Additionally we consider how the robustness of the whole commu ...
... Pillai et al. (2010) by accounting for species differences in dispersal range (Appendix S1). Using numerical solutions of this system, we investigate how habitat loss, fragmentation and the combination of both affect species persistence. Additionally we consider how the robustness of the whole commu ...
Outline for the next 2 weeks Habitat loss, degradation and
... Grasslands, savannas and shrublands -!cover 40.5% of earth’s surface -!ideal for agriculture and livestock ...
... Grasslands, savannas and shrublands -!cover 40.5% of earth’s surface -!ideal for agriculture and livestock ...
The Marsupial Lion (Thylacoleo carnifex)
... The diet of the T.carnifex is thought to be similar to large herbivores such as Diprotodon, Sthenurus and Phascolonus. Milewka has argued that a full size Diprotodon or Sthenurus could not have been killed by this predator. He continues by saying that Thylacoleo only preyed on the pouch young of lar ...
... The diet of the T.carnifex is thought to be similar to large herbivores such as Diprotodon, Sthenurus and Phascolonus. Milewka has argued that a full size Diprotodon or Sthenurus could not have been killed by this predator. He continues by saying that Thylacoleo only preyed on the pouch young of lar ...
Population Viability Analysis Annual Review of Ecology and
... populations, the target of most PVA (121). In a sense, the distinction between deterministic and stochastic processes in ecology is artificial because all ecological processes are stochastic. Maynard Smith (97) points out that "the use of deterministic rather than stochastic models can only be justi ...
... populations, the target of most PVA (121). In a sense, the distinction between deterministic and stochastic processes in ecology is artificial because all ecological processes are stochastic. Maynard Smith (97) points out that "the use of deterministic rather than stochastic models can only be justi ...
Ziv 2000
... Abstract. Larger species tend to occupy more habitats, but a theoretical framework for the pattern is lacking. I modified the continuous-time logistic equation of population growth in two ways to allow for such a habitat-based theoretical framework. First, I separated birth rate from death rate. Sec ...
... Abstract. Larger species tend to occupy more habitats, but a theoretical framework for the pattern is lacking. I modified the continuous-time logistic equation of population growth in two ways to allow for such a habitat-based theoretical framework. First, I separated birth rate from death rate. Sec ...
Are invasive species a major cause of extinctions?
... of the extinction risk posed by aliens. Alien plants might be more likely to cause displacement and community change rather than causing species extinctions. This is the case, for example, for Psidium cattleianum in rainforests in Madagascar, where its presence has altered diversity patterns in comm ...
... of the extinction risk posed by aliens. Alien plants might be more likely to cause displacement and community change rather than causing species extinctions. This is the case, for example, for Psidium cattleianum in rainforests in Madagascar, where its presence has altered diversity patterns in comm ...
Are invasive species a major cause of extinctions?
... of the extinction risk posed by aliens. Alien plants might be more likely to cause displacement and community change rather than causing species extinctions. This is the case, for example, for Psidium cattleianum in rainforests in Madagascar, where its presence has altered diversity patterns in comm ...
... of the extinction risk posed by aliens. Alien plants might be more likely to cause displacement and community change rather than causing species extinctions. This is the case, for example, for Psidium cattleianum in rainforests in Madagascar, where its presence has altered diversity patterns in comm ...
S33-4 Extinction by hybridization and introgression in anatine ducks
... species are not being relocated to environments to which they are not adapted. This approach has been suggested for the Laysan duck (Rhymer, 2001) and gray duck (Rhymer, et al., 2004), but careful consideration of the consequences is essential. Culling ruddy ducks has been recommended to control the ...
... species are not being relocated to environments to which they are not adapted. This approach has been suggested for the Laysan duck (Rhymer, 2001) and gray duck (Rhymer, et al., 2004), but careful consideration of the consequences is essential. Culling ruddy ducks has been recommended to control the ...
1091-Lec8Fraga
... Grasslands, savannas and shrublands -cover 40.5% of earth’s surface -ideal for agriculture and livestock ...
... Grasslands, savannas and shrublands -cover 40.5% of earth’s surface -ideal for agriculture and livestock ...
Appendix S1. Details of Species Distribution Modeling and
... While these values may underestimate the actual but theoretical ceiling possible, they provide a consistent upper bound that can be used across all scenarios for ranking and comparison of outcomes. Density dependence was implemented by reducing rates of survival and growth (due to intraspecific comp ...
... While these values may underestimate the actual but theoretical ceiling possible, they provide a consistent upper bound that can be used across all scenarios for ranking and comparison of outcomes. Density dependence was implemented by reducing rates of survival and growth (due to intraspecific comp ...
Habitat selection determines abundance, richness and species
... and thus operate both within communities and at the metacommunity scale (Resetarits 2005). Multispecies habitat selection generates very different ecological consequences compared with random dispersal and differential mortality because species distributions are based on the redistribution of indivi ...
... and thus operate both within communities and at the metacommunity scale (Resetarits 2005). Multispecies habitat selection generates very different ecological consequences compared with random dispersal and differential mortality because species distributions are based on the redistribution of indivi ...
Ecological Modelling Mathematical model of livestock and
... the different ecological processes that drive the metapopulation dynamics. Vacant patches can be colonized and occupied ones can be freed, as will be described below. Predators can only colonize patches already occupied by prey (as in Swihart et al., 2001, see also Srivastava et al., 2008). Predatio ...
... the different ecological processes that drive the metapopulation dynamics. Vacant patches can be colonized and occupied ones can be freed, as will be described below. Predators can only colonize patches already occupied by prey (as in Swihart et al., 2001, see also Srivastava et al., 2008). Predatio ...
A presence-only habitat suitability model for large grazing
... in the multi-dimensional space, the principal components of ENFA have ecological significance (Hirzel et al., 2002). The first component, the marginality factor (MF), passes through the centroid of all species observations and the centroid of all background cells in the study area. A high MF value t ...
... in the multi-dimensional space, the principal components of ENFA have ecological significance (Hirzel et al., 2002). The first component, the marginality factor (MF), passes through the centroid of all species observations and the centroid of all background cells in the study area. A high MF value t ...
Arctic lemmings: keystone species in a changing environment.
... population dynamics of lemmings in northern Canada. Understanding whether ongoing climate change will affect lemming population dynamics and their use of habitat in the Canadian Arctic is central to forecasting the future of arctic ecosystems. Consequently, Douglas Morris and Angélique Dupuch are ex ...
... population dynamics of lemmings in northern Canada. Understanding whether ongoing climate change will affect lemming population dynamics and their use of habitat in the Canadian Arctic is central to forecasting the future of arctic ecosystems. Consequently, Douglas Morris and Angélique Dupuch are ex ...
Biodiversity - Jean-Francois Le Galliard
... because of the heterogeneity of species records across regions, time periods and taxa, and of difficulty to record speciation and extinction events with fossil records ...
... because of the heterogeneity of species records across regions, time periods and taxa, and of difficulty to record speciation and extinction events with fossil records ...
POPULATION VIABILITY ANALYSIS Mark S. Boyce Journal Article
... that virtually all ecological processes are nonlinear (17, 122). When the system contains nonlinearities,its behavior may differ markedly due to Jensen’s inequality which states that for any concave function, t$ ,of a random variable E[@(X)] S @ [E(X)]; the reverse inequality applies for a convex fu ...
... that virtually all ecological processes are nonlinear (17, 122). When the system contains nonlinearities,its behavior may differ markedly due to Jensen’s inequality which states that for any concave function, t$ ,of a random variable E[@(X)] S @ [E(X)]; the reverse inequality applies for a convex fu ...
Habitat and Niche
... Each organism plays a particular role in its ecosystem. A niche is the role a species plays in the ecosystem. In other words, a niche is how an organism “makes a living.” A niche will include the organism’s role in the flow of energy through the ecosystem. This involves how the organism gets its ene ...
... Each organism plays a particular role in its ecosystem. A niche is the role a species plays in the ecosystem. In other words, a niche is how an organism “makes a living.” A niche will include the organism’s role in the flow of energy through the ecosystem. This involves how the organism gets its ene ...
Mixed effects of habitat fragmentation on species richness and
... ‘rescue effect’ (Brown & Kodric-Brown, 1977) may significantly increase species richness and abundance (Gilbert et al., 1998; Gonzalez et al., 1998). Single-species metapopulation modelling (Pelletier, 2000; Ovaskainen, 2002) suggests that the optimal degree of fragmentation of a given total area of ...
... ‘rescue effect’ (Brown & Kodric-Brown, 1977) may significantly increase species richness and abundance (Gilbert et al., 1998; Gonzalez et al., 1998). Single-species metapopulation modelling (Pelletier, 2000; Ovaskainen, 2002) suggests that the optimal degree of fragmentation of a given total area of ...
Greater Prairie-Chicken - Playa Lakes Joint Venture
... Greater prairie-chickens were once widespread but they currently exist in only a small fraction of their historic range.1,2 Approximately 10,000 to 12,000 birds are found in Colorado; they can be found in Logan, Morgan, Phillips, Sedgwick, Washington, and Yuma Counties.3 Greater prairie-chickens req ...
... Greater prairie-chickens were once widespread but they currently exist in only a small fraction of their historic range.1,2 Approximately 10,000 to 12,000 birds are found in Colorado; they can be found in Logan, Morgan, Phillips, Sedgwick, Washington, and Yuma Counties.3 Greater prairie-chickens req ...