Species interactions
... • Intraspecific competition = between members of the same species - High population density = increased competition • Interspecific competition = between members of 2 or more species - Leads to competitive exclusion or species coexistence ...
... • Intraspecific competition = between members of the same species - High population density = increased competition • Interspecific competition = between members of 2 or more species - Leads to competitive exclusion or species coexistence ...
Tree heterogeneity, resource availability, and larger scale processes
... INTRODUCTION Species richness may be influenced by processes acting on several different spatial and temporal scales (Ricklefs & Schluter 1993; Godfray & Lawton 2001). According to Srivastava (1999), a local area is one where all the species occurring within it are able to encounter and interact in ...
... INTRODUCTION Species richness may be influenced by processes acting on several different spatial and temporal scales (Ricklefs & Schluter 1993; Godfray & Lawton 2001). According to Srivastava (1999), a local area is one where all the species occurring within it are able to encounter and interact in ...
Ecological benefits of the temporary nature concept
... Temporary nature seems very attractive to some species, but finally does not offer suitable conditions for survival or reproduction. Examples: Birds are attracted to a breeding site with suitable conditions, but predation of chicks is too high for maintaining the population. Animals are attracted to ...
... Temporary nature seems very attractive to some species, but finally does not offer suitable conditions for survival or reproduction. Examples: Birds are attracted to a breeding site with suitable conditions, but predation of chicks is too high for maintaining the population. Animals are attracted to ...
A distance-based framework for measuring functional diversity from
... be considered when using that approach, but which Villéger et al. (2008) have not mentioned: what should we do if PCoA returns negative eigenvalues? Indeed, some distance matrices will not allow the distance relationships among the objects to be fully represented in a Euclidean space (Gower 1982). ...
... be considered when using that approach, but which Villéger et al. (2008) have not mentioned: what should we do if PCoA returns negative eigenvalues? Indeed, some distance matrices will not allow the distance relationships among the objects to be fully represented in a Euclidean space (Gower 1982). ...
Modelling Herbivore grazing resources using hyperspectral
... photosynthesis (as long as other factors such as water availability or light are not limiting) (Field and Mooney 1986). Of the nitrogen found in a leaf, a large fraction (over 50%) is contained in the carbonfixing enzyme ribulose biphosphate carboxylase. It is therefore not surprising that there is ...
... photosynthesis (as long as other factors such as water availability or light are not limiting) (Field and Mooney 1986). Of the nitrogen found in a leaf, a large fraction (over 50%) is contained in the carbonfixing enzyme ribulose biphosphate carboxylase. It is therefore not surprising that there is ...
Deleting species from model food webs
... time scales of the order of the lifetimes of individuals, the number of species is fixed and the dynamics is determined by a set of coupled ordinary differential equations for the species population densities. This population dynamics uses a multi-species variant of the ratiodependent functional res ...
... time scales of the order of the lifetimes of individuals, the number of species is fixed and the dynamics is determined by a set of coupled ordinary differential equations for the species population densities. This population dynamics uses a multi-species variant of the ratiodependent functional res ...
10/19/06 version
... composition with: (a) those between adjacent quadrats, and (b) those between subsites 50 m apart. From Wilson et al. (1996b). ...
... composition with: (a) those between adjacent quadrats, and (b) those between subsites 50 m apart. From Wilson et al. (1996b). ...
The Endangered Species Act and the Oil and Gas Industry
... • Listing factors: 1) present or threatened damage to or destruction of habitat or curtailment of range; 2) overutilization for commercial, recreational, scientific, or educational purposes; 3) disease or predation; 4) inadequacy of existing protective measures; and 5) other natural or manmade facto ...
... • Listing factors: 1) present or threatened damage to or destruction of habitat or curtailment of range; 2) overutilization for commercial, recreational, scientific, or educational purposes; 3) disease or predation; 4) inadequacy of existing protective measures; and 5) other natural or manmade facto ...
A Meta-analysis of Studies on Plant Growth
... not used. All plants had to be grown either as isolated individuals or in monoculture, and all species within a study had to be grown under identical conditions. Many of the studies presented several comparisons on the same species that could potentially be used for this analysis. For example, a stu ...
... not used. All plants had to be grown either as isolated individuals or in monoculture, and all species within a study had to be grown under identical conditions. Many of the studies presented several comparisons on the same species that could potentially be used for this analysis. For example, a stu ...
Chapter04 - Duluth High School
... Law of Competitive Exclusion - No two species will occupy the same niche and compete for exactly the same resources for an extended period of time. One will either migrate, become extinct, or partition the resource and utilize a sub-set of the same resource. - Given resource can only be partitione ...
... Law of Competitive Exclusion - No two species will occupy the same niche and compete for exactly the same resources for an extended period of time. One will either migrate, become extinct, or partition the resource and utilize a sub-set of the same resource. - Given resource can only be partitione ...
Effects of resource abundance on habitat selection and spatial
... MAZURKIEWICZ 1994; ZHIGAREV 2005) but also rarer methods such as the spool-and-line technique (CRAINE 1985) and fluorescent marking (CLARK et al. 2001; MCDONALD and ST CLAIR 2004) have been used. These studies have contributed significantly to the understanding of small mammal biology, however there ...
... MAZURKIEWICZ 1994; ZHIGAREV 2005) but also rarer methods such as the spool-and-line technique (CRAINE 1985) and fluorescent marking (CLARK et al. 2001; MCDONALD and ST CLAIR 2004) have been used. These studies have contributed significantly to the understanding of small mammal biology, however there ...
Spatial distribution and abundance of the giant tiger prawn
... is part of the process of naturalization described by Lockwood et al. (2007). In order to confirm the establishment of P. monodon in the region, it is necessary to develop further research that should focus on all life stages as only information on large juveniles and adults is currently available. ...
... is part of the process of naturalization described by Lockwood et al. (2007). In order to confirm the establishment of P. monodon in the region, it is necessary to develop further research that should focus on all life stages as only information on large juveniles and adults is currently available. ...
Why Healthy Oceans Need Sharks
... allows top predators to switch prey species when certain populations are low, thereby allowing prey species to persist.2,3 Apex predators not only affect population dynamics by consuming prey, but they also can control the spatial distribution of potential prey through intimidation. Fear of shark pr ...
... allows top predators to switch prey species when certain populations are low, thereby allowing prey species to persist.2,3 Apex predators not only affect population dynamics by consuming prey, but they also can control the spatial distribution of potential prey through intimidation. Fear of shark pr ...
Historical land use and environmental determinants
... performed between levels of the covariate to determine differences between categories (Stokes et al., 2000). Additionally, we conducted multiple regression analyses with general linear models to understand the dependence of the total abundance, or cover, of nonnative species per plot on the biotic, ...
... performed between levels of the covariate to determine differences between categories (Stokes et al., 2000). Additionally, we conducted multiple regression analyses with general linear models to understand the dependence of the total abundance, or cover, of nonnative species per plot on the biotic, ...
Community structure of snakes in a human
... of occupancy (both years: 100%) than intermediate (1998: 88%, 1999: 75%) or small patches (1998: 11%, 1999: 64%). All remaining comparisons were based on the 15 occupied patches (large=3, intermediate=5, and small=7) that were sampled in both years. We pooled data collected in both years. We capture ...
... of occupancy (both years: 100%) than intermediate (1998: 88%, 1999: 75%) or small patches (1998: 11%, 1999: 64%). All remaining comparisons were based on the 15 occupied patches (large=3, intermediate=5, and small=7) that were sampled in both years. We pooled data collected in both years. We capture ...
MOOREA`S NEWEST INVASIVE SPECIES: THE DISTRIBUTION
... H. frenatus is succeeding in displacing other gecko species because of heightened aggression, and P. laticauda can now be considered more aggressive, H. frenatus populations may be affected. However, since P. laticauda did not show significant aggression towards the two native species (G. oceanica a ...
... H. frenatus is succeeding in displacing other gecko species because of heightened aggression, and P. laticauda can now be considered more aggressive, H. frenatus populations may be affected. However, since P. laticauda did not show significant aggression towards the two native species (G. oceanica a ...
Exam Two: Ecology Part 1
... IDENTIFY the type of symbiosis from a example IDENTIFY polar, temperate and tropical zones on earth IDENTIFY the different zones in aquatic ecosystems IDENTIFY the process that builds most of the organic molecules found on earth IDENTIFY an example of primary or secondary succession OUTLINE primary ...
... IDENTIFY the type of symbiosis from a example IDENTIFY polar, temperate and tropical zones on earth IDENTIFY the different zones in aquatic ecosystems IDENTIFY the process that builds most of the organic molecules found on earth IDENTIFY an example of primary or secondary succession OUTLINE primary ...
Threatened species of the Northern Territory
... terrestrial, and shelters under logs and other cover. As with other dunnarts, the diet of this species probably comprises invertebrates, and possibly some small vertebrates. ...
... terrestrial, and shelters under logs and other cover. As with other dunnarts, the diet of this species probably comprises invertebrates, and possibly some small vertebrates. ...
An in situ study of predator aggregations on scallop (Pecten
... in percentage occurrence (number of frames in which the animal was observed / total number of frames examined*100) from 0.01 to 45.2%. The starfish, Asterias rubens, was the most frequently observed species, appearing in three times as many frames as any other species. The next most frequently obser ...
... in percentage occurrence (number of frames in which the animal was observed / total number of frames examined*100) from 0.01 to 45.2%. The starfish, Asterias rubens, was the most frequently observed species, appearing in three times as many frames as any other species. The next most frequently obser ...
Deep-sea ecosystem: a world of positive biodiversity – ecosystem
... al., 2013), in enhancing ecosystem functioning. In this study we investigate the BEF relationships in ...
... al., 2013), in enhancing ecosystem functioning. In this study we investigate the BEF relationships in ...
Plants and insects in early oldfield succession
... Plant couer and species richness Differences in temporal patterns of change in cover at the two sites was evident in the first season (Table 1). I n May of the first year at the Iowa site, the cover was only 10% and reflected the fact that plants were exclusively seedlings, most of which were still ...
... Plant couer and species richness Differences in temporal patterns of change in cover at the two sites was evident in the first season (Table 1). I n May of the first year at the Iowa site, the cover was only 10% and reflected the fact that plants were exclusively seedlings, most of which were still ...
Are invasive plant species better competitors than native plant
... treatments were compared to an appropriate control performed simultaneously and in the same place. We excluded from our analysis purely observational studies (i.e. spacing, correlation or neighbourhood analysis, changes through time and comparisons between sites with and without alien species) becau ...
... treatments were compared to an appropriate control performed simultaneously and in the same place. We excluded from our analysis purely observational studies (i.e. spacing, correlation or neighbourhood analysis, changes through time and comparisons between sites with and without alien species) becau ...
FOOD WEBS
... nature; small, controlled perturbations are difficult to achieve in field experiments and hard to recognize in time series of fluctuating populations. A more indirect approach is to take empirical community matrices and compare their properties with randomized matrices that are not subject to any dy ...
... nature; small, controlled perturbations are difficult to achieve in field experiments and hard to recognize in time series of fluctuating populations. A more indirect approach is to take empirical community matrices and compare their properties with randomized matrices that are not subject to any dy ...
Population density of North American elk
... foraging, which is determined by population density of herbivores relative to carrying capacity (K) of the ecosystem (Kie et al. 2003; Persson et al. 2005; Stewart et al. 2006). We define low to moderate levels of herbivory as population density of herbivores that is at or below the maximum number o ...
... foraging, which is determined by population density of herbivores relative to carrying capacity (K) of the ecosystem (Kie et al. 2003; Persson et al. 2005; Stewart et al. 2006). We define low to moderate levels of herbivory as population density of herbivores that is at or below the maximum number o ...
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... power. It has been both a partial cause and a major result of two contiauing trends: an increasing emphasis on extinction as a common,local, ecologically important event, rather than a rare, global, evolutionary one, and a shift of focus from the individual and the species to the local population as ...
... power. It has been both a partial cause and a major result of two contiauing trends: an increasing emphasis on extinction as a common,local, ecologically important event, rather than a rare, global, evolutionary one, and a shift of focus from the individual and the species to the local population as ...