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The dusk orientation and the influence of successive tests on pied flycatchers (ficedula hypoleuca) tested in emlen funnels

Italian Journal of Zoology, ISSN: 1748-5851, Vol: 64, Issue: 3, Page: 245-251
1997
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Pied flycatchers were tested twice at sunset under a clear sky, a clear sky with moon, and under artificial overcast conditions. The mean spring direction was W-NW, with a higher westward bias than in previous tests performed in complete darkness. The activity of single tests was high but their directionality was low, with an inverse correlation between activity and directionality. Under clear skies (with or without moon) the distribution of birds performing a test for the first or second time was not different, with high consistency of individual birds, while in overcast conditions second tests shifted southwards, seemingly a phototactic reaction. Under clear skies (with and without moon), in the second test individual vector lengths increased and there was no correlation between individual activity and vector value, indicating an improvement of the perform ance; in contrast, in second overcast tests vectors tended to decrease and the negative correlation activity/vector was significant. So, although the mean direction was not different from the clear sky, the individual performance was worse in overcast conditions, probably due to a decrease in motivation to migrate during prolonged overcast conditions. © 1997 Taylor & Francis Group, LLC.

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