Ecological Consequences of Extinction
... majority of studies have found a positive but saturating relationship between richness and function, such that ecosystem function approaches its maximum level at some intermediate level of species richness (Schwartz et al., 2000). One explanation for this relationship is based on the ecosystem redun ...
... majority of studies have found a positive but saturating relationship between richness and function, such that ecosystem function approaches its maximum level at some intermediate level of species richness (Schwartz et al., 2000). One explanation for this relationship is based on the ecosystem redun ...
The role of plant species in biomass production and response to
... assemblages is caused more by complementarity than by sampling effects (Loreau & Hector 2001; Tilman et al. 2001), yet how species interactions generate complementarity is poorly understood. The lack of understanding of these interactions is especially acute for aggregate properties of the ecosystem ...
... assemblages is caused more by complementarity than by sampling effects (Loreau & Hector 2001; Tilman et al. 2001), yet how species interactions generate complementarity is poorly understood. The lack of understanding of these interactions is especially acute for aggregate properties of the ecosystem ...
this PDF file
... Index Terms— smote, spatial distribution, spatiotemporal information, speciation, speciation prediction ...
... Index Terms— smote, spatial distribution, spatiotemporal information, speciation, speciation prediction ...
Elmqvist
... (Zimov et al. 1995), and overfishing seems to have had similar effects on coastal ecosystems (Jackson et al. 2001). The loss of specialist species may entail lower rates of ecosystem processes, and some functions performed by specialists may not be carried out at all – for example, the decomposition ...
... (Zimov et al. 1995), and overfishing seems to have had similar effects on coastal ecosystems (Jackson et al. 2001). The loss of specialist species may entail lower rates of ecosystem processes, and some functions performed by specialists may not be carried out at all – for example, the decomposition ...
Analysis of interspecific competition in perennial plants using life table
... millefolium by 91%, 95% and 99% respectively. Values of with and without competition were 3.95 and 46.13 for T. pratense; 17.2 and 320.3 for A. odoratum; 2.31 and 248 for A. millefolium. Contribution of the lower-level vital rates Accuracy of the first-order approximation – The contribution of the ...
... millefolium by 91%, 95% and 99% respectively. Values of with and without competition were 3.95 and 46.13 for T. pratense; 17.2 and 320.3 for A. odoratum; 2.31 and 248 for A. millefolium. Contribution of the lower-level vital rates Accuracy of the first-order approximation – The contribution of the ...
Nesting Success of Birds in Different Silvicultural Treatments in
... the edge of the plot. We estimated the relative abundance of all breeding bird species using 8–12 ( x ⫽ 10.6) fixed-radius (50 m) point counts per plot. Prior to beginning censusing, experienced bird watchers spent 1–2 weeks practicing bird identification and distance estimation so that their skills ...
... the edge of the plot. We estimated the relative abundance of all breeding bird species using 8–12 ( x ⫽ 10.6) fixed-radius (50 m) point counts per plot. Prior to beginning censusing, experienced bird watchers spent 1–2 weeks practicing bird identification and distance estimation so that their skills ...
What is the impact of Impatiens glandulifera on
... plots (Pysˇek and Pysˇek, 1995). Some individuals of I. glandulifera were present in 23 of the 30 uninvaded plots because in the study system with high invasion dynamics, it was difficult to find a vegetation free of the invading species. Nevertheless, the cover of I. glandulifera in uninvaded plots ...
... plots (Pysˇek and Pysˇek, 1995). Some individuals of I. glandulifera were present in 23 of the 30 uninvaded plots because in the study system with high invasion dynamics, it was difficult to find a vegetation free of the invading species. Nevertheless, the cover of I. glandulifera in uninvaded plots ...
Coexistence, niches and biodiversity effects on ecosystem functioning
... have similar characteristics to these high-yielding species. Highdiversity mixtures that contain lots of species are also more likely to include a high-yielding species; hence, positive biodiversity effects might simply be due to this so-called sampling or selection effect (Aarssen 1997; Huston 1997 ...
... have similar characteristics to these high-yielding species. Highdiversity mixtures that contain lots of species are also more likely to include a high-yielding species; hence, positive biodiversity effects might simply be due to this so-called sampling or selection effect (Aarssen 1997; Huston 1997 ...
Biodiversity and ecosystem stability: a synthesis of underlying
... Although at first sight this observation might seem to resolve the diversity–stability debate, from a theoretical angle it raises more questions than it provides answers. Traditional theory predicts that diversity and complexity should beget community instability (May 1973). What, then, explains the ...
... Although at first sight this observation might seem to resolve the diversity–stability debate, from a theoretical angle it raises more questions than it provides answers. Traditional theory predicts that diversity and complexity should beget community instability (May 1973). What, then, explains the ...
Habitat Loss, Trophic Collapse, and the Decline of Ecosystem
... top by regulation are functions of this ecosystem type as brittle. In contrast, classified there will be other types a function where between of ecosystem competition example, ...
... top by regulation are functions of this ecosystem type as brittle. In contrast, classified there will be other types a function where between of ecosystem competition example, ...
Variable elements of metacommunity structure across an aquatic
... than within the more tightly competing groups in their respective habitats. Species with similar traits should theoretically lead to even stronger competition signal. Thus, rather than focusing on common ancestry alone (i.e. taxonomic groups), examining these patterns for species with similar functi ...
... than within the more tightly competing groups in their respective habitats. Species with similar traits should theoretically lead to even stronger competition signal. Thus, rather than focusing on common ancestry alone (i.e. taxonomic groups), examining these patterns for species with similar functi ...
Plant community responses to long-term fertilization: Changes in
... biomass by 64% during this period (Fig. 2A). In 2002, 14 years after the fertilization treatment ...
... biomass by 64% during this period (Fig. 2A). In 2002, 14 years after the fertilization treatment ...
Canadian Herpetological Society Société d`herpétologie du Canada
... population size using mark-recapture observations; and 2) calculate the age of maturity based on growth rates over time of reproductive females and generation time (the average age of reproductive individuals in the population). A third component was to develop a habitat suitability model from occur ...
... population size using mark-recapture observations; and 2) calculate the age of maturity based on growth rates over time of reproductive females and generation time (the average age of reproductive individuals in the population). A third component was to develop a habitat suitability model from occur ...
Environmental heterogeneity, species diversity and
... account for negative heterogeneity–diversity relationships (HDR) revealed in several case studies. Here we explore how HDR varies at different spatial scales and provide novel theories for small-scale species co-existence that explain both positive and negative HDR. At large spatial scales of hetero ...
... account for negative heterogeneity–diversity relationships (HDR) revealed in several case studies. Here we explore how HDR varies at different spatial scales and provide novel theories for small-scale species co-existence that explain both positive and negative HDR. At large spatial scales of hetero ...
Niche: A Productive Guide for Use in the Analysis of Cultural
... condition for any living systems reproductive process such that the new individual reproduced is constrained by the "remembered" properties of its parental source. One can say that the principle is simple, you cannot make a silk purse out of a sow's ear, or there are structural constraints on the ou ...
... condition for any living systems reproductive process such that the new individual reproduced is constrained by the "remembered" properties of its parental source. One can say that the principle is simple, you cannot make a silk purse out of a sow's ear, or there are structural constraints on the ou ...
Rapid Evolutionary Change and the Coexistence of Species
... making coexistence more likely. In this framework a species’ mean fitness refers to the component of its population growth rate that is independent of its density and the density of competing species (see the sidebar on Ecological Versus Evolutionary Fitness for a further discussion of ecological fitn ...
... making coexistence more likely. In this framework a species’ mean fitness refers to the component of its population growth rate that is independent of its density and the density of competing species (see the sidebar on Ecological Versus Evolutionary Fitness for a further discussion of ecological fitn ...
Rapid Evolutionary Change and the Coexistence of Species
... making coexistence more likely. In this framework a species’ mean fitness refers to the component of its population growth rate that is independent of its density and the density of competing species (see the sidebar on Ecological Versus Evolutionary Fitness for a further discussion of ecological fitn ...
... making coexistence more likely. In this framework a species’ mean fitness refers to the component of its population growth rate that is independent of its density and the density of competing species (see the sidebar on Ecological Versus Evolutionary Fitness for a further discussion of ecological fitn ...
Habitat diversity and species diversity: testing the
... Young, K. A. 2001. Habitat diversity and species diversity: testing the competition hypothesis with juvenile salmonids. – Oikos 95: 87 – 93. I experimentally tested two predictions of the hypothesis that the positive relationship between habitat diversity and species diversity arises from a reductio ...
... Young, K. A. 2001. Habitat diversity and species diversity: testing the competition hypothesis with juvenile salmonids. – Oikos 95: 87 – 93. I experimentally tested two predictions of the hypothesis that the positive relationship between habitat diversity and species diversity arises from a reductio ...
Plant Attribute Diversity, Resilience, and Ecosystem Function: The
... Most diversity–function studies have related, in one way or another, number of species to ecosystem biomass or production. Some [for example, McNaughton (1985) and Tilman (1996)] have shown that year-to-year variation in species abundance tends to stabilize community biomass, and a few [Vitousek and ...
... Most diversity–function studies have related, in one way or another, number of species to ecosystem biomass or production. Some [for example, McNaughton (1985) and Tilman (1996)] have shown that year-to-year variation in species abundance tends to stabilize community biomass, and a few [Vitousek and ...
Birds in Urban Ecosystems: Population Dynamics, Community
... parasites between urban and wildland birds. Yet, it is not intuitive how these variables should change along the wildland–urban gradient due to the scant research on urban bird physiology. In Germany, urban blackbirds (Turdus merula) showed lower levels of corticosterone stress levels than forest bi ...
... parasites between urban and wildland birds. Yet, it is not intuitive how these variables should change along the wildland–urban gradient due to the scant research on urban bird physiology. In Germany, urban blackbirds (Turdus merula) showed lower levels of corticosterone stress levels than forest bi ...
A weed risk assessment system for new conservation weeds in New
... open habitats unsuitable for frugivorous birds, and a scoring system for that habitat type might give bird dispersal a lower score. Even so, many naturalised species have abundant wind-blown seeds, but only a few are considered to be conservation weeds. Thus, attributes such as dispersal mode may be ...
... open habitats unsuitable for frugivorous birds, and a scoring system for that habitat type might give bird dispersal a lower score. Even so, many naturalised species have abundant wind-blown seeds, but only a few are considered to be conservation weeds. Thus, attributes such as dispersal mode may be ...
270-275 - University of Oklahoma
... Living under extreme environmental conditions is usually associated with costs; however, very little is known about potential benefits. Townsend et al. (2003) point this out by defining an extreme environmental condition as one that requires, of any organism tolerating it, costly adaptations absent ...
... Living under extreme environmental conditions is usually associated with costs; however, very little is known about potential benefits. Townsend et al. (2003) point this out by defining an extreme environmental condition as one that requires, of any organism tolerating it, costly adaptations absent ...
Biodiversity and resilience of arthropod communities after fire
... i = species; j,k = sites. Sjk = 1 if xij = xik for every species i; Sjk = 0 if sites j and k do not share any species. For this analysis, we only considered those species for which the total number of all individuals sampled was at least five. The number of individuals was log(x+1)transformed in ord ...
... i = species; j,k = sites. Sjk = 1 if xij = xik for every species i; Sjk = 0 if sites j and k do not share any species. For this analysis, we only considered those species for which the total number of all individuals sampled was at least five. The number of individuals was log(x+1)transformed in ord ...
Ecology3e Ch15 Lecture KEY
... be more extreme at high-elevation sites, these results suggest that positive interactions may be more common in stressful environments. Similar results have been found in intertidal communities. ...
... be more extreme at high-elevation sites, these results suggest that positive interactions may be more common in stressful environments. Similar results have been found in intertidal communities. ...
The impacts of invasive plant species on the biodiversity of
... some invasive species have a demonstrated capacity to drastically alter plant species composition and the structure of native vegetation. Many of the more prominent rangeland weeds reach very high densities and biomass. For example, Tomley (1998) refers to densities of the shrubby vine Cryptostegia ...
... some invasive species have a demonstrated capacity to drastically alter plant species composition and the structure of native vegetation. Many of the more prominent rangeland weeds reach very high densities and biomass. For example, Tomley (1998) refers to densities of the shrubby vine Cryptostegia ...