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Matching of Granivorous Mammals of the Great Basin and Sonoran Deserts on a Species-for-Species Basis

Mark V. Lomolino
Journal of Mammalogy
Vol. 74, No. 4 (Nov., 1993), pp. 863-867
DOI: 10.2307/1382424
Stable URL: http://www.jstor.org/stable/1382424
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Matching of Granivorous Mammals of the Great Basin and Sonoran Deserts on a Species-for-Species Basis
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Abstract

Guilds of granivorous rodents from the Great Basin and Sonoran deserts appear similar in species number, overdispersion of body sizes and matching of body sizes on a species-for-species basis. Monte Carlo simulations, however, revealed that these guilds are not matched on a species-for-species basis. The apparent matching of species between these guilds is an artifact of selection for small size in granivorous, desert mammals. Overdispersion of body sizes within guilds did not increase matching between them. In general, purported cases of matching at the species level may, under closer scrutiny, prove to be artifacts of community convergence at coarser levels.

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