Density-dependent habitat selection in muskrats: a test of the ideal free distribution model

✍ Scribed by F. Messier; J. A. Virgl; L. Marinelli

• Publisher: Springer-Verlag
• Year: 1990
• Tongue: English
• Weight: 637 KB
• Volume: 84
• Category: Article
• ISSN: 0029-8549
• DOI: 10.1007/bf00329763

✦ Synopsis

Two predictions of the ideal free distribution model, a null hypothesis of habitat selection, were examined using free-ranging muskrats. We rejected the prediction that the proportion of the animals found in each of five habitats was independent of population size. Data on over-winter occupancy of muskrat dwellings tend also to refute the prediction of equal fitness reward among habitats. Habitat type and water-level had a profound effect on the suitability of a site for settlement. We concluded that the observed pattern of muskrat distribution followed more closely an ideal despotic distribution where some individuals benefited from a higher fitness because of resource monopolization. Current theories of density-dependent habitat selection, which assume an ideal free distribution, would not apply to muskrats and possibly to many other mammal species.