the distribution of species occupancy scale and rarity

Occupancy, Spatial Variance, and the Abundance of Species ...

Ruan Veldtman, Steven L. Chown, Melodie A. McGeoch Using scale-area curves to quantify the distribution, abundance and range expansion potential of an invasive species, Diversity and Distributions 16, no.1 1 (Jan 2010): 159–169.

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A self-similarity model for the occupancy frequency distribution

Feb 01, 2007 · For example, species-range size distributions show that, in general, most species in an assemblage are rare in terms of their extent of occurrence, occupancy or area of occupancy (Gaston, 1994, Gaston, 1996). The frequency distribution of species geographic range sizes is therefore strongly right-skewed.

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PDF Integrating species distribution and occupancy modeling to ...

2020). Lack of distribution data can be especially challenging when developing range-wide conservation plans for elusive, rare, or declining species (Collins and Crump, 2009). Large scale surveys for rare species can be costly, time consuming, and random sampling is often unlikely to result in acquisition of numerous species detections (Buckley and

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Functional Rarity: The Ecology of Outliers: Trends in ...

Rarity has been a central topic for conservation and evolutionary biologists aiming to determine the species characteristics that cause extinction risk. More recently, beyond the rarity of species, the rarity of functions or functional traits, called functional rarity, has gained momentum in helping to understand the impact of biodiversity decline on ecosystem functioning.

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(PDF) Roles of Spatial Scale and Rarity on the ...

For species with <5 distribution records set occurrence probability to one in grid cells where the species was detected.Step 3: Estimate species richness• For each of the 90 probability realisations (10 random draws for each of the nine pseudo-absence sets), sum the probabilities across all species to obtain 90 different species richness ...

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Predicting the distribution of a rare chipmunk (Neotamias ...

Species distribution models (SDMs) use information about where a species occurs to determine the relationship between species occurrence and environmental variables and thus create maps that predict the species' distribution. SDMs are useful for studying poorly understood species, species of conservation concern, and invasive species.

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Patterns in the occupancy and abundance of the globally rare ...

Species where it is ranked Critically Endangered due to its limited distribution and documented population declines (Scheidegger 2003). The distribution of E. pedicellatum is limited to four population centers worldwide: Scandinavia (Ahlner 1948; Holien et al. 1995), Atlantic Canada (Ahti & Jørgenson 1971; Cameron 2004; Maass 1983), Alaska (Nelson et al.

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Scale effect and bimodality in the frequency distribution ...

Ranked species occupancy curves may be expected to be more exponential at large spatial scales and more sigmoidal at smaller spatial scales [10], which could explain the observed consistency in ...

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PDF Sampling scales define occupancy and underlying occupancy ...

Sampling scales define occupancy and underlying occupancy-abundance relationships in animals ROBIN STEENWEG, 1,4 MARK HEBBLEWHITE,1 JESSE WHITTINGTON,2 PAUL LUKACS,1 AND KEVIN MCKELVEY 3 1Wildlife Biology Program, W.A. Franke College of Forestry and Conservation, University of Montana, Missoula, Montana 59812 USA 2Parks Canada, Banff National Park Resource Conservation, Banff, Alberta T1L ...

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The distribution of species: occupancy, scale, and rarity ...

The distribution of species: occupancy, scale, and rarity . By Fangliang He and Rick Condit. Abstract. Species occupancy is typically measured as the number of cells occupied by the species in a study area. Because it is easy to document and interpret and it correlates with species abundance, occupancy is widely used for measur

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How to predict fine resolution occupancy from coarse ...

Knowing the distribution and abundance of organisms at high resolutions is critical for many conservation applications. For example, the area of occupancy (AOO) of a species is an easily calculated measure of a species' rarity and range that is correlated with abundance (Gaston, 1994; Gaston & Lawton, 1990), which is much more difficult to ...

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PDF Trematode prevalence−occupancy relationships on regional ...

tion of species is the so-called abundance−occupancy relationship. Whereas species with a high local abun-dance tend to be widely distributed, locally rare spe-cies tend to occur only at a few sites, resulting in a positive inter-specific relationship among species between local abundance and large-scale site occu-

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Species‐specific differences in detection and occupancy ...

The power to detect change is, however, sensitive to changes in occupancy with the lowest power associated with occupancy rates of 0.5 and power increasing as species become either very common or very rare; the highest power to detect declines occurs in species with low occupancy and detection probabilities >0.1 (Fig. 3; Appendix S1: Fig. S1).

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Species Rarity - an overview | ScienceDirect Topics

For the distribution of species we follow the steps of Rabinowitz with two levels of rarity across scales. At the local scale (e.g., at the community scale) we discriminate scarce versus abundant species, while at the regional level we define restricted versus widespread species (Table 1).

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Scaling pattern of occupancy - Wikipedia

In spatial ecology and macroecology, scaling pattern of occupancy (SPO), also known as the area-of-occupancy (AOO) is the way in which species distribution changes across spatial scales.In physical geography and image analysis, it is similar to the modifiable areal unit problem. Simon A. Levin (1992) states that the problem of relating phenomena across scales is the central problem in biology ...

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Multiple occupancy-abundance patterns in staghorn coral ...

Results. We show that five types of occupancy-abundance relationships exist in staghorn coral assemblages, including four patterns of rarity. The overwhelming majority of species (73%) are rare according to local abundance and/or distribution criteria.

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Relative occupancy, endemism, taxonomic distinctiveness and ...

A method is presented whereby regional species are scored and ranked in order of regional conservation importance according to a number of different but complementary 'rarity' criteria. Approaches for determining regional occupancy (RO), relative taxonomic distinctiveness (RTD), relative endemism (RE) and relative vulnerability (RV) rankings for regional faunas are proposed.

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CAUSES OF LANDSCAPE‐SCALE RARITY IN COBBLE BEACH PLANT ...

However, the factors that limit the distribution and abundance of rare species are seldom examined and are poorly understood. I tested several explanations of landscape‐scale rarity in the New England cobble beach plant community, an assemblage of halophytic forbs associated with fringing beds of the marine intertidal grass Spartina alterniflora.

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RARITY, FRAGMENTATION, AND THE SCALE DEPENDENCE OF EXTINCTION ...

Attributes of a species' spatial distribution, such as the number of occurrences and the spatial distribution of those occurrences, can affect extinction risk. Extinction risk, however, is scale dependent, and it is unclear how scale dependency affects linkages between species' distributions and extinction risk.

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PDF Species distribution, ecology, abundance, body size and ...

mating species extinction risk (Fattorini 2008, 2010a,b, 2011; Fattorini et al. 2012). Large-scale studies on species rarity have led to the identification of some recurrent macroecological pat-terns: (1) the frequency distribution of range size, (2) the rela-tionship between range size and species abundance and (3) the

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