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Larval ecology of Rana arvalis: an allopatric island population compared with a sympatric mainland population

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Rana arvalis has escaped its mainland competitor Rana temporaria on the Baltic island of Gotland. Larvae from mainland and island R. arvalis populations were raised in inter- as well as intraspecific regimes of different densities. Gotlandian larvae had a longer larval period and a lower growth rate than mainland conspecifics at the provided densities. The Gotlandian larvae did not respond more strongly to competition with R. temporaria than mainland larvae, but they seemed to have lost competitive ability in general. When competing with a stronger competitor, this loss of competitive ability in general is predicted to give the same effect as a loss of competitive ability towards that specific species.

Affiliations: 1: Department of Animal Ecology, University of Lund, Ecology Building, S-223 62 Lund, Sweden


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