Inny tytuł:

Acta Ornithologica, vol. 37, no. 2 ; Migracje gąsiorka na obrzeżach pustyń: badania w Eilat, Izrael ; Red-backed shrike migration

Współtwórca:

Polska Akademia Nauk. Muzeum i Instytut Zoologii

Wydawca:

Muzeum i Instytut Zoologii PAN

Miejsce wydania:

Warszawa

Opis:

Bibliogr. s. 89-90 ; S. [85]-90 : il. ; 27 cm ; Streszcz. pol. Nazwy taksonów także w jęz. łac.

Typ obiektu:

Czasopismo/Artykuł

Abstrakt:

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.

Czasopismo/Seria/cykl:

Acta Ornithologica

Tom:

37

Zeszyt:

2

Strona pocz.:

85

Strona końc.:

90

Szczegółowy typ zasobu:

Artykuł

Format:

application/pdf

Identyfikator zasobu:

oai:rcin.org.pl:45669

Źródło:

MiIZ PAN, patrz sygn. czas. P.257-37-2 ; MiIZ PAN, patrz sygn. czas. P.4568-37-2 ; click here to follow the link

Język:

pol ; eng

Prawa:

Prawa zastrzeżone - dostęp ograniczony

Zasady wykorzystania:

Zasób chroniony prawem autorskim. Korzystanie dozwolone wyłącznie na terminalach Muzeum i Instytutu Zoologii PAN w zakresie określonym przez przepisy o dozwolonym użytku.

Digitalizacja:

Muzeum i Instytut Zoologii Polskiej Akademii Nauk

Lokalizacja oryginału:

Biblioteka Muzeum i Instytutu Zoologii PAN

Dofinansowane ze środków:

Program Operacyjny Innowacyjna Gospodarka, lata 2010-2014, Priorytet 2. Infrastruktura strefy B + R ; Unia Europejska. Europejski Fundusz Rozwoju Regionalnego

Dostęp:

Zamknięty