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INSULAR DISTRIBUTIONS OF VOLES AND SHREWS: THE RESCUE EFFECT AND IMPLICATIONS FOR SPECIES CO-OCCURRENCE PATTERNS

G.H. Adler and M.L. Wilson
Coenoses
Vol. 4, No. 2 (Summer 1989), pp. 69-72
Published by: Akadémiai Kiadó
Stable URL: http://www.jstor.org/stable/43461265
Page Count: 4
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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.
INSULAR DISTRIBUTIONS OF VOLES AND SHREWS: THE RESCUE EFFECT AND IMPLICATIONS FOR SPECIES CO-OCCURRENCE PATTERNS
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Abstract

Distributional and numerical relationships between the meadow vole (Microtus pennsylvanicus) and the short-tailed shrew (Blarina brevicauda) on Massachusetts islands were analyzed and found to be inconsistent with previous studies. Population-level interactions between these two species both with and without other variables were qualitatively modeled in order to reconcile inconsistencies. Changes in levels of immigration of M. pennsylvanicus to islands can change expectations of coexistence from negative to positive. This rescue effect was apparently powerful enough to alter expected correlations between M. pennsylvanicus and B. brevicauda on Massachusetts islands.

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