Results 251 to 260 of about 52,051 (301)
Anthropogenic fire patterns affect niche breadth and niche overlap in sympatric songbird species [PDF]
Science of the Total Environment, 2022 The severity of wildfires increases globally, and return intervals decrease. Fires can benefit biodiversity, as post-burn early successional stages provide diverse habitats and niches for many species.
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On the Measurement of Niche Breadth and Overlap
Ecology, 1971Measures of niche breadth and overlap that depend on the distribution of individual among resource states (ecological categories) should be independent of the relative abundance of the species and of the number of resource states considered. Such measures should also take into account the degree of distinctness of the resource states from the point of ...
Robert K, Colwell, Douglas J, Futuyma
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Ecology, 1980
This paper examines the mathematical bases of three commonly used measures of niche overlap along a single resource dimension: curve averaging, asymmetrical α and symmetrical α. Also, we examine the common methods (product α, summation α) for calculating overlap along two or more resource dimensions.
C. N. Slobodchikoff, William C. Schulz
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This paper examines the mathematical bases of three commonly used measures of niche overlap along a single resource dimension: curve averaging, asymmetrical α and symmetrical α. Also, we examine the common methods (product α, summation α) for calculating overlap along two or more resource dimensions.
C. N. Slobodchikoff, William C. Schulz
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On the theory of niche overlap
Theoretical Population Biology, 1974Abstract The factors which are likely to limit niche overlap are studied for a class of idealized biological communities in which several species compete on a onedimensional continuum of resources, e.g., food size. Although the shape of the resource spectrum restricts the composition of possible equilibrium communities, and although this restriction ...
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On the limit to niche overlap for nonuniform niches
Theoretical Population Biology, 1976Abstract May and MacArthur (1972) have demonstrated that where several species are in competition for a single resource the requirement of long term population stability sets an upper limit to the allowable similarity of competing species. Their model considers a community of N species competing on a one dimensional resource continuum e.g., food ...
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Multivariate measures of similarity and niche overlap
Theoretical Population Biology, 1989Niche overlap measures are used to assess the similarity in resource use by two species. Recently researchers have used niche overlap measures as summary measures and for making inferences, typically about competition for resources. The problem of estimating niche overlap when the niches are multivariate normal distributions with equal covariance ...
Lu, Ruey-Pyng +2 more
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Multivariate measure of niche overlap using canonical correspondence analysis [PDF]
Ecoscience, 1997 A measure of multidimensional niche overlap based on species scores from canonical correspondence analysis is presented. This measure, N, is the amount of overlap using species scores as approximate weighted averages with respect to multidimensional ...
Janice L Pappas
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Bias in Estimating Niche Overlap
Ecology, 1982Bias refers to the accuracy of a particular estimator. We evaluate bias, using analytic and simulation technics, for six measures of overlap: the likelihood ratio measure, the chi—square measure, the measure based on the Freeman—Tukey statistic, Morisita's adjusted index, Morista's original index, and Horn's information index.
Eric P. Smith, Thomas M. Zaret
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Oikos, 1982
The niche overlap hypothesis states that "maximal tolerable overlap should vary inversely with the intensity of competition." Rigorous testing of this hypothesis has been complicated by problems of measurement and by the difficulty of formulating operational definitions of "maximal tolerable overlap" and "intensity of competition." We test this ...
John H. Porter, Raymond D. Dueser
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The niche overlap hypothesis states that "maximal tolerable overlap should vary inversely with the intensity of competition." Rigorous testing of this hypothesis has been complicated by problems of measurement and by the difficulty of formulating operational definitions of "maximal tolerable overlap" and "intensity of competition." We test this ...
John H. Porter, Raymond D. Dueser
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Niche Overlap and Competition in Woodrats
Journal of Mammalogy, 1971The ranges of Neotoma lepida and Neotoma fuscipes overlap in the Mohave Desert of southeastern California. Food resources of these woodrats were analyzed to determine degree of overlap and other possible competitive interactions. In most aspects of habitat, the two species are distinctly separated, but analyses of food caches and stomach contents ...
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