Spatial pattern in Anthyllis cytisoides shrubland on abandoned land
... Spain were investigated by second-order spatial analysis (Ripley’s K-function). All shrubs (Anthyllis cytisoides and subdominant Artemisia barrelieri) were either randomly distributed or clumped at scales of 0.25 - 1.0 m. The pattern shown by A. cytisoides shrubs alone changed from clumped to random ...
... Spain were investigated by second-order spatial analysis (Ripley’s K-function). All shrubs (Anthyllis cytisoides and subdominant Artemisia barrelieri) were either randomly distributed or clumped at scales of 0.25 - 1.0 m. The pattern shown by A. cytisoides shrubs alone changed from clumped to random ...
Comparative ecology of desert small mammals: a
... degus, as have foraging studies (see below). Short-term experiments with giving-up densities.—Longterm field studies such as those in Portal, Arizona, and Fray Jorge in Chile do not directly assess the mechanisms underlying competitive suppression, however. An alternative means of assessing the impo ...
... degus, as have foraging studies (see below). Short-term experiments with giving-up densities.—Longterm field studies such as those in Portal, Arizona, and Fray Jorge in Chile do not directly assess the mechanisms underlying competitive suppression, however. An alternative means of assessing the impo ...
appendix w5 - Department of Water Affairs
... High diversity of vegetation and geomorphological structure and patchiness/interspersion. High rating=3; High diversity of vegetation and geomorphological structure and low patchiness interspersion. Moderate rating=2; Low diversity of vegetation and geomorphological structure and high patchiness/int ...
... High diversity of vegetation and geomorphological structure and patchiness/interspersion. High rating=3; High diversity of vegetation and geomorphological structure and low patchiness interspersion. Moderate rating=2; Low diversity of vegetation and geomorphological structure and high patchiness/int ...
Chapter 10 - Lakeland Regional High School
... • Scientists are warning that we are in the midst of another mass extinction. • The rate of extinctions is estimated to have increased by a multiple of 50 since 1800, with up to 25 percent of all species on Earth becoming extinct between 1800 and 2100. • The current mass extinction is different from ...
... • Scientists are warning that we are in the midst of another mass extinction. • The rate of extinctions is estimated to have increased by a multiple of 50 since 1800, with up to 25 percent of all species on Earth becoming extinct between 1800 and 2100. • The current mass extinction is different from ...
Leopardus jacobita, Andean Cat
... compared to the sympatric Pampas Cat, suggesting a "smaller current or historic population size." The only population estimate available was for a 25,000 ha area in northern Chile, around the Salar de Surire National Monument, where Napolitano et al. (2008) estimated five individuals to occur based ...
... compared to the sympatric Pampas Cat, suggesting a "smaller current or historic population size." The only population estimate available was for a 25,000 ha area in northern Chile, around the Salar de Surire National Monument, where Napolitano et al. (2008) estimated five individuals to occur based ...
Habitat Structure - MSC Program Improvements
... adjacent soft-bottom environments may provide foraging opportunities. It is important to note that these services may be life-stage and size dependent and can change according to the density of biotic and abiotic physical matter within the habitat structure itself” (Grieve et al., 2011). Original Pr ...
... adjacent soft-bottom environments may provide foraging opportunities. It is important to note that these services may be life-stage and size dependent and can change according to the density of biotic and abiotic physical matter within the habitat structure itself” (Grieve et al., 2011). Original Pr ...
Diversity and ecosystem functioning: Litter decomposition
... The decomposition of plant litter is an essential process in terrestrial ecosystems, resulting in carbon and nutrients being recycled for primary production (Swift et al., 1979). Given that most of the plant material produced is in this way returned to the ecosystem, the importance of plant species ...
... The decomposition of plant litter is an essential process in terrestrial ecosystems, resulting in carbon and nutrients being recycled for primary production (Swift et al., 1979). Given that most of the plant material produced is in this way returned to the ecosystem, the importance of plant species ...
Chapter 53
... When One Species Is a Better Competitor • Gause’s experiments illuminated an important distinction: 1. A species’ fundamental niche is the resources it uses or conditions it tolerates in the absence of competitors. 2. A species’ realized niche is the resources it uses or conditions it tolerates whe ...
... When One Species Is a Better Competitor • Gause’s experiments illuminated an important distinction: 1. A species’ fundamental niche is the resources it uses or conditions it tolerates in the absence of competitors. 2. A species’ realized niche is the resources it uses or conditions it tolerates whe ...
pdf. - Robert Colwell
... colours is assumed to remain the same. In an open metacommunity, in which the assemblage changes size and composition through time, it may not be possible to draw valid inferences about community structure from a snapshot sample at one point in time (Magurran 2007). Few, if any, real communities are ...
... colours is assumed to remain the same. In an open metacommunity, in which the assemblage changes size and composition through time, it may not be possible to draw valid inferences about community structure from a snapshot sample at one point in time (Magurran 2007). Few, if any, real communities are ...
Patterns in Species Richness
... crucial aspect of that community’s biodiversity. The exact meaning of biodiversity is discussed in Chapter 14, but for now it is clear that if we wish to conserve or restore biodiversity, then we must understand how species numbers are determined and how it comes about that they vary. We will see th ...
... crucial aspect of that community’s biodiversity. The exact meaning of biodiversity is discussed in Chapter 14, but for now it is clear that if we wish to conserve or restore biodiversity, then we must understand how species numbers are determined and how it comes about that they vary. We will see th ...
Biological Diversity - FIU Faculty Websites
... colours is assumed to remain the same. In an open metacommunity, in which the assemblage changes size and composition through time, it may not be possible to draw valid inferences about community structure from a snapshot sample at one point in time (Magurran 2007). Few, if any, real communities are ...
... colours is assumed to remain the same. In an open metacommunity, in which the assemblage changes size and composition through time, it may not be possible to draw valid inferences about community structure from a snapshot sample at one point in time (Magurran 2007). Few, if any, real communities are ...
Greater glider - Brisbane City Council
... Yellow-bellied gliders prefer habitat where there are spotted gums (Eyre and Goldingay 2003) and winter flowering tree species (Kavanagh 1987; Goldingay 1990). ...
... Yellow-bellied gliders prefer habitat where there are spotted gums (Eyre and Goldingay 2003) and winter flowering tree species (Kavanagh 1987; Goldingay 1990). ...
species replacement during early secondary succession
... 3) weighing 0.01–1.5% of what they had the first year (Table 2). Mean plant height and diameter also decreased annually (June/July dates in Fig. 2e, f). Although mean height and diameter were generally greatest at the last sampling period each year (August), means at that time were based on the few ...
... 3) weighing 0.01–1.5% of what they had the first year (Table 2). Mean plant height and diameter also decreased annually (June/July dates in Fig. 2e, f). Although mean height and diameter were generally greatest at the last sampling period each year (August), means at that time were based on the few ...
the ecological consequences of changes in biodiversity
... and others continued to explore the impacts of diversity on stability, but for the next two decades, many ecologists considered diversity of little relevance to stability or other ecosystem processes. This attitude seems to have changed (e.g., McNaughton 1993, Givnish 1994, Tilman and Downing 1994, ...
... and others continued to explore the impacts of diversity on stability, but for the next two decades, many ecologists considered diversity of little relevance to stability or other ecosystem processes. This attitude seems to have changed (e.g., McNaughton 1993, Givnish 1994, Tilman and Downing 1994, ...
Community secondary production as a measure of ecosystem
... the limitations of our sampling method, our values are not exact whole-ecosystem values, as they do not include in situ growth rates for every species. However, the use of published growth rates from similar environmental conditions to estimate secondary production is a common practice when in situ ...
... the limitations of our sampling method, our values are not exact whole-ecosystem values, as they do not include in situ growth rates for every species. However, the use of published growth rates from similar environmental conditions to estimate secondary production is a common practice when in situ ...
The Scottish Beaver Trial – The effects of beavers on Atlantic
... loss of lichen habitat continuity at the stool scale (Figure 2). Some lichen species can take many years to recolonise a habitat. Hence, even short breaks in lichen habitat continuity can result in the loss of lichen species from an area. The impact was restricted to a maximum of c. 60 m from a loch ...
... loss of lichen habitat continuity at the stool scale (Figure 2). Some lichen species can take many years to recolonise a habitat. Hence, even short breaks in lichen habitat continuity can result in the loss of lichen species from an area. The impact was restricted to a maximum of c. 60 m from a loch ...
Deterministic and stochastic forces in community ecology:
... individual-based simulation model with a heterogeneous environment. We found that functionally equivalent species were better able to persist when the metacommunity was limited to a small number of functional groups or under extreme propagule limitation. However, with increasing functional diversity ...
... individual-based simulation model with a heterogeneous environment. We found that functionally equivalent species were better able to persist when the metacommunity was limited to a small number of functional groups or under extreme propagule limitation. However, with increasing functional diversity ...
Eds., K. Omori, X. Guo, N. Yoshie, N. Fujii, I.... © by TERRAPUB, 2011.
... observed δ 15N values were lower than predicted for both size classes of both species, suggesting that observation error is not a strong cause of the mismatch between observed and predicted values. Thirdly, models based on dietary analyses alone may be vulnerable to the spatial and temporal limitati ...
... observed δ 15N values were lower than predicted for both size classes of both species, suggesting that observation error is not a strong cause of the mismatch between observed and predicted values. Thirdly, models based on dietary analyses alone may be vulnerable to the spatial and temporal limitati ...
Action Plan No.7 - Environment, Planning and Sustainable
... adult S. plana and the females are so much more inconspicuous than the males that no population estimates were attempted at York Park. A 1:1 sex ratio would give a population density of 3500 per hectare. A two year life cycle would mean that double the number of adults observed are potentially prese ...
... adult S. plana and the females are so much more inconspicuous than the males that no population estimates were attempted at York Park. A 1:1 sex ratio would give a population density of 3500 per hectare. A two year life cycle would mean that double the number of adults observed are potentially prese ...
Key Elements of Biodiversity in British Columbia
... Typically, functional importance has been described at the level of species. And the functional importance of ‘keystone’ species has long been recognised: these are species that have a greater functional importance than suggested by their biomass. Alternatively, ‘foundation’ species are also known t ...
... Typically, functional importance has been described at the level of species. And the functional importance of ‘keystone’ species has long been recognised: these are species that have a greater functional importance than suggested by their biomass. Alternatively, ‘foundation’ species are also known t ...
From spatially explicit ecological models to mean
... tremendous enhancing of complexity of parameter space: even after a large number of time expensive simulations we may still poorly understand what patterns of dynamics we should expect to find in the given system and how they depend on model parameters. In the absence of solid empirical evidence, pat ...
... tremendous enhancing of complexity of parameter space: even after a large number of time expensive simulations we may still poorly understand what patterns of dynamics we should expect to find in the given system and how they depend on model parameters. In the absence of solid empirical evidence, pat ...
Alternative causes of edge-abundance relationships in birds and
... Changes in the distribution and abundance of bird and small mammal species at urban-wildland edges can be caused by different factors. Edges can affect populations directly if animals respond behaviorally to the edge itself or if proximity to edge directly affects demographic vital rates (an ‘‘ecoto ...
... Changes in the distribution and abundance of bird and small mammal species at urban-wildland edges can be caused by different factors. Edges can affect populations directly if animals respond behaviorally to the edge itself or if proximity to edge directly affects demographic vital rates (an ‘‘ecoto ...
Mycorrhizae and succession in plantings of beachgrass in sand dunes
... plant colonizers (Nicolson, 1960; Sylvia and Will, 1988; Harbor and PilgrimLake by wind-blownsand are longGemma and Koske, 1989, 1992; Koske and Gemma, standingproblemsin the area. ...
... plant colonizers (Nicolson, 1960; Sylvia and Will, 1988; Harbor and PilgrimLake by wind-blownsand are longGemma and Koske, 1989, 1992; Koske and Gemma, standingproblemsin the area. ...
Zooplankton population dynamics: measuring in situ growth and
... ABSTRACT: An application to assess in situ population dynamics rates is introduced based on the measurements of size-structured zooplankton population. This method differs from those based on species and stages by taking advantage of allometrically-scaled rates, automated sampling devices and net to ...
... ABSTRACT: An application to assess in situ population dynamics rates is introduced based on the measurements of size-structured zooplankton population. This method differs from those based on species and stages by taking advantage of allometrically-scaled rates, automated sampling devices and net to ...