TY - GEN N1 - Bibliogr. p. 89-90 N1 - P. [85]-90 : ill. ; 27 cm N1 - Abstract in Polish. Taxa in Latin N2 - 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. M3 - Text J2 - Acta Ornithologica, vol. 37, no. 2 J2 - Migracje gąsiorka na obrzeżach pustyń: badania w Eilat, Izrael J2 - Red-backed shrike migration PY - 2002 IS - 2 EP - 90 KW - Red-backed Shrike KW - birds KW - bird migration KW - Israel KW - Red Sea coast KW - body condition KW - migration strategy KW - shrikes KW - Lanius collurio KW - Laniidae KW - Aves KW - 1984-2001 A1 - Tryjanowski, Piotr A1 - Yosef, Reuven A2 - Polska Akademia Nauk. Muzeum i Instytut Zoologii PB - Muzeum i Instytut Zoologii PAN VL - 37 CY - Warszawa SP - 85 T1 - Differences between the spring and autumn migration of the red-backed shrike Lanius collurio: record from the Eilat stopover (Israel) UR - http://rcin.org.pl/dlibra/publication/edition/45669 ER -