Results 261 to 270 of about 6,022,549 (302)

On the Relative Abundance of Species

The American Naturalist, 1960
1. A distinction is made between opportunistic and equilibrium species. 2. There is little ecological interest in the relative abundances of opportunistic species, but such species abundances should frequently have a log-normal distribution. 3. The relative abundances of equilibrium species are of considerable ecological interest and frequently can be ...
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On the statistical mechanics of species abundance distributions

Theoretical Population Biology, 2012
A central issue in ecology is that of the factors determining the relative abundance of species within a natural community. The proper application of the principles of statistical physics to species abundance distributions (SADs) shows that simple ecological properties could account for the near universal features observed.
Bowler, Michael G., Kelly, Colleen K.
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SPECIES IN THE TAIL OF RANK–ABUNDANCE CURVES

Ecology, 1999
At focal sites within dry sclerophyll woodland and temperate rain forest, species were identified that were of low local abundance and hence in the tail of the rank–abundance curve. We then asked the question: What proportion of tail species within a given community are constitutive members of the tail everywhere throughout their geographical range ...
Brad R. Murray, Barbara L. Rice, David A. Keith, Peter J. Myerscough, Jocelyn Howell, Alex G. Floyd, Kevin Mills, Mark Westoby   +7 more
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A meta‐analysis of species–abundance distributions

Oikos, 2010
The species–abundance distribution (SAD) describes the abundances of all species within a community. Many different models have been proposed to describe observed SADs. Best known are the logseries, the lognormal, and a variety of niche division models.
Ulrich, Werner, Marcin Ollik, Ugland, Karl   +2 more
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Species abundance distributions

Ecology Letters, 2007
Species abundance distributions (SADs) follow one of ecology's oldest and most universal laws - every community shows a hollow curve or hyperbolic shape on a histogram with many rare species and just a few common species. Here, we review theoretical, empirical and statistical developments in the study of SADs. Several key points emerge.
McGill, Brian J., Etienne, Rampal S., Gray, John S., Alonso, David, Anderson, Marti J., Benecha, Habtamu Kassa, Dornelas, Maria, Enquist, Brian J., Green, Jessica L., He, Fangliang, Hurlbert, Allen H., Magurran, Anne E., Marquet, Pablo A., Maurer, Brian A., Ostling, Annette, Soykan, Candan U., Ugland, Karl I., White, Ethan P.   +17 more
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The relative abundance of species

1984
Ecologists have long recognized that species are not equally abundant, and that communities with similar species densities often differ in another way; the relative importance or abundance of the constituent species. Considerable effort has been expended in attempts to document differences and regularities in relative abundances, as an understanding of
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Exploring Spatial and Multitype Assemblages of Species Abundances

Biometrical Journal, 2009
AbstractThe ecological theory of the existence of multiple stable states between species, or the spatial heterogeneity of some unobserved environmental factor, supports the idea of multitype interactions between species. These multitype interactions can lead to different assemblages of species abundances.
Georgescu, Vera, Soubeyrand, Samuel, Kretzschmar, Andre, Laine, Anna-Liisa   +3 more
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Applied Hierarchical Modeling in Ecology: Analysis of Distribution, Abundance and Species Richness in R and BUGS

, 2015
Applied Hierarchical Modeling in Ecology: Distribution, Abundance, Species Richness offers a new synthesis of the state-of-the-art of hierarchical models for plant and animal distribution, abundance, and community characteristics such as species richness
M. Kéry, J. Andrew Royle
semanticscholar   +1 more source

Road densities and species abundance

2009 17th International Conference on Geoinformatics, 2009
Roads form a complex system to connect people and goods. In recent years, the economic development and population increase have led to the active construction of new roads and railways. Therefore, as the human activities increase, the density of roads also escalates.
null Yi-Fang Chen, W.W. Chen
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Models for the logarithmic species abundance distributions

Theoretical Population Biology, 1974
Abstract Three models, developed by Karlin, McGregor and Ewens to describe evolving populations of selectively neutral genotypes, are shown to lead to various versions of Fisher's logarithmic series distribution for species abundance. Statistical inference procedures and measures of diversity which have been developed in one of the two contexts are ...
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