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To Fly or Not to Fly? Colonization of Baltic Islands by Winged and Wingless Carabid Beetles

Stefan As
Journal of Biogeography
Vol. 11, No. 5 (Sep., 1984), pp. 413-426
Published by: Wiley
DOI: 10.2307/2844805
Stable URL: http://www.jstor.org/stable/2844805
Page Count: 14
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To Fly or Not to Fly? Colonization of Baltic Islands by Winged and Wingless Carabid Beetles
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Abstract

The importance of flight ability for dispersal of carabid beetles to islands in the Stockholm archipelago (N59 20; E19 20) in the western part of the brackish Baltic sea is evaluated. A null-hypothesis based on equal colonization probability for winged and non-winged species is rejected because many more non-winged species than expected were found on the islands. A model based on an exponential decline in number of individuals with distance from mainland (passive wind transport), and a normal decline with distance to mainland for individuals transported on the water surface, shows that differences in dispersal ability might explain the observed pattern. An alternative model based on equal dispersal ability but different mortality for individuals of species with different wing morphology seems improbable. The hypothesis that more unstable habitats should have a more mobile fauna is discussed and is found not to fit the carabid beetles on these islands.

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