Old endemics and new invaders: alternative strategies of passerines for living in the Australian environment |
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Authors: | E Geffen Y Yom-Tov |
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Institution: | (1) Institute of Nature Conservation Research, Tel Aviv University, Tel Aviv 69978, Israel, IL;(2) Department of Zoology, Tel Aviv University, Tel Aviv 69978, Israel e-mail: yomtov@ccsg.tau.ac.il Tel.: +972-3-6409058, Fax: +972-3-6409403, IL |
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Abstract: | Life history parameters of ”old endemics” and ”new invaders” among the Australian passerines were compared, controlling for
phylogeny by using current, phylogenetic research methods. Old endemics were found to have significantly smaller clutches
and demonstrated significantly more cooperative breeding than the new invaders, whose fledging periods are significantly longer
than those of the old endemics. We argue that breeding under conditions of a small annual food increment during the breeding
season, as is probably the situtation in Australia, is possible only when clutch size is small, or while breeding cooperatively,
or by extending the fledging period. Our data show that the old endemics use the first two options, while the new invaders
employ the third.
Received: 10 February 1999 / Received in revised form: 10 November 1999 / Accepted: 20 November 1999 |
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Keywords: | Clutch size Fledging Incubation Life history parameters Passerines Australia |
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