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Acta Ornithologica, vol. 37, no. 2 ; Migracje gąsiorka na obrzeżach pustyń: badania w Eilat, Izrael ; Red-backed shrike migration
Polska Akademia Nauk. Muzeum i Instytut Zoologii
Muzeum i Instytut Zoologii PAN
Bibliogr. p. 89-90 ; P. [85]-90 : ill. ; 27 cm ; Abstract in Polish. Taxa in Latin
Migratory Red-backed Shrikes were mist-netted during the spring and autumn migrations (n = 1031 individuals) from 1984 to 2001 in Eilat (Israel). In a similar pattern of trapping, more than four times as many shrikes were caught during autumn than in spring. Males migrated significantly earlier than females in spring but not during the autumn migration, which suggests that in males there is a stronger drive to reach their breeding territories early. In both seasons and between both sexes we did not find any significant relations between the body measurements of individuals and the time of passage. The spring migration lasted a much shorter time than the autumn one. This was expressed by the minimum stopover duration, as well as by the time when Red-backed Shrikes occurred in Eilat. There are significant differences between wing chord length, body mass and fat scores between seasons. In autumn, males had longer wings, and both sexes were heavier and in better condition than in spring. The data suggest that the differences are an adaptation to their having to cross the Sahara Desert. The birds spend a statistically significantly shorter period of time at the Eilat stopover site in spring than in autumn (median 1 ą 1.5 days vs 5 ą 6.5 days). In autumn, recaptured birds were 6.3% heavier than during the first capture. The change in body mass was significantly correlated to the duration of the stopover. The results suggest that migration over desert is energetically costly and that Eilat is a very important stopover site for migrating Red-backed Shrikes.
MiIZ PAN, call no. P.257-37-2 ; MiIZ PAN, call no. P.4568-37-2 ; click here to follow the link
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Museum and Institute of Zoology of the Polish Academy of Sciences
Library of the Museum and Institute of Zoology of the Polish Academy of Sciences
Programme Innovative Economy, 2010-2014, Priority Axis 2. R&D infrastructure ; European Union. European Regional Development Fund
Oct 2, 2020
Jun 10, 2014
124
https://rcin.org.pl./publication/55576
Goławski, Artur
Surmacki, Adrian Kuczyński, Lechosław Tryjanowski, Piotr
Jędraszko-Dąbrowska, Danuta
Tryjanowski, Piotr
Tryjanowski, Piotr
Zduniak, Piotr Yosef, Reuven Polska Akademia Nauk. Muzeum i Instytut Zoologii
Tryjanowski, Piotr Karg, Małgorzata K. Karg, Jerzy