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Titolo:
Timing of breeding range occupancy among high-latitude passerine migrants
Autore:
Benson, AM; Winker, K;
Indirizzi:
Alaska Bird Observ, Fairbanks, AK 99708 USA Alaska Bird Observ Fairbanks AK USA 99708 Observ, Fairbanks, AK 99708 USA Univ Alaska Museum, Fairbanks, AK 99775 USA Univ Alaska Museum Fairbanks AK USA 99775 Museum, Fairbanks, AK 99775 USA
Titolo Testata:
AUK
fascicolo: 2, volume: 118, anno: 2001,
pagine: 513 - 519
SICI:
0004-8038(200104)118:2<513:TOBROA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
EAST-CENTRAL ALASKA; YELLOW WARBLERS; MIGRATION; POPULATION; PRODUCTIVITY; ONTARIO;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Benson, AM Alaska Bird Observ, POB 80505, Fairbanks, AK 99708 USA Alaska Bird Observ POB 80505 Fairbanks AK USA 99708 K 99708 USA
Citazione:
A.M. Benson e K. Winker, "Timing of breeding range occupancy among high-latitude passerine migrants", AUK, 118(2), 2001, pp. 513-519

Abstract

The brief subarctic summer limits the time available for birds to completetheir reproductive activities, yet the temporal requirements of high-latitude passerine migrants are not well understood. Our analyses examined the timing of spring and autumn migration among 18 passerine species to obtain indirect estimates of the time they occupy their breeding ranges in northwestern North America. From 1992 to 1998, the Alaska Bird Observatory (64 degrees 50 'N, 147 degrees 50 'W) banded 31,698 individuals during the most intensive standardized mist-netting study ever conducted in subarctic North America. Among the migrants examined, the estimated number of clays that species were present in interior Alaska ranged from 48 days for adult Alder Flycatchers (Empidonax alnorum) to 129 days for American Robins (Turdus migratorius). Adults departed significantly later in autumn than immatures in 10 of 18 species we examined and significantly earlier than immatures in only one species, Alder Flycatcher. Breeding range occupancy of Nearctic-Neotropic migrants occurs in this region within the range of average frost-free temperatures in Fairbanks, Alaska, and is significantly shorter in duration than among Nearctic-Nearctic ("short-distance") migrants at this latitude.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 14:23:52