Results 271 to 280 of about 809,119 (310)
Some of the next articles are maybe not open access.
1993
Abstract How many individuals of each species are there in a given community, and why? These questions, which lie at the heart of ecology, continue to motivate much ecological research. In this chapter one approach to answering these questions will be considered, i.e. the detection and interpretation of patterns of species abundance that
Sean Nee, Paul H Harvey, Peter Cotgreave
openaire +1 more source
Abstract How many individuals of each species are there in a given community, and why? These questions, which lie at the heart of ecology, continue to motivate much ecological research. In this chapter one approach to answering these questions will be considered, i.e. the detection and interpretation of patterns of species abundance that
Sean Nee, Paul H Harvey, Peter Cotgreave
openaire +1 more source
On the Distribution and Abundance of Species
Science, 1999Harte et al . ([1][1]) assumed the probability rule: if a species occurs in an area A , then the probability that it occurs in half of that area is a constant, a , independent of area A , satisfying 0.5 ≤ a ≤ 1. From this rule, Harte et al .
Roger D. Maddux, Krishna Athreya
openaire +1 more source
The form of species-abundance distributions
Journal of Theoretical Biology, 1980Abstract Small, isolated communities in harsh environments are sometimes found to contain many, very rare species together with a few, extremely abundant ones. The species-abundance distribution (frequencies of species vs. abundance levels) drops rapidly from an initial peak to an elongated tail.
openaire +2 more sources
Self-Similarity in the Distribution and Abundance of Species
Science, 1999If the fraction of species in area A that are also found in one-half of that area is independent of A , the distribution of species is self-similar and a number of observed patterns in ecology, including the widely cited species-area relationship connecting species richness to censused area ...
, Harte, , Kinzig, , Green
openaire +2 more sources
On the Relative Abundance of Species
Ecology, 1969When data are collected so that they can be treated as coming from a variety of sample sizes, it is possible to use the same data to test the effect of altering sample size on the fit to any model. The method is applied to nonpredatory soil mites and their fit to the "broken—stick" model of MacArthur. It is found that by choosing a quadrat size of 4 in.
openaire +1 more source
A statistical theory for sampling species abundances
Ecology Letters, 2007AbstractThe pattern of species abundances is central to ecology. But direct measurements of species abundances at ecologically relevant scales are typically unfeasible. This limitation has motivated a long‐standing interest in the relationship between the abundance distribution in a large, regional community and the distribution observed in a small ...
Jessica L, Green, Joshua B, Plotkin
openaire +2 more sources
On the Relative Abundance of Species
The American Naturalist, 19601. 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 ...
openaire +1 more source
On the statistical mechanics of species abundance distributions
Theoretical Population Biology, 2012A 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.
openaire +2 more sources
SPECIES IN THE TAIL OF RANK–ABUNDANCE CURVES
Ecology, 1999At 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 +7 more
openaire +1 more source
Species abundance distributions
Ecology Letters, 2007Species 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. +17 more
openaire +1 more source