Age-related differential timing of spring migration within sexes in passerines.: An article from: Wilson Bulletin
Book Details
PublisherWilson Ornithological Society
ISBN / ASINB0008FW92O
ISBN-13978B0008FW923
MarketplaceFrance 🇫🇷
Description
This digital document is an article from Wilson Bulletin, published by Wilson Ornithological Society on June 1, 2002. The length of the article is 5983 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: We examined differential timing of spring migration by age class for passerines banded at Long Point Bird Observatory from 1984 to 1998. Mean capture dates of after-second-year (ASY) males were earlier than second-year (SY) males for 19 of 20 species, 16 significantly so. Mean capture dates of ASY females were earlier than SY females for 11 of 12 species, 8 significantly so. There was no significant difference in the timing of migration between age classes for males of species with highly distinctive SY plumages and males of other species with more subtle plumage differences between age classes. For 12 species with adequate samples of both sexes, the mean difference in capture dates between age classes was significantly greater for males (3.5 days) than for females (2.1 days). These results suggest that differential migration by age class is widespread among passerines and that factors leading to the delayed arrival of young males also may affect females, though to a lesser extent.
Citation Details
Title: Age-related differential timing of spring migration within sexes in passerines.
Author: Rebecca L.M. Stewart
Publication:Wilson Bulletin (Refereed)
Date: June 1, 2002
Publisher: Wilson Ornithological Society
Volume: 114 Issue: 2 Page: 264(8)
Distributed by Thomson Gale
From the author: We examined differential timing of spring migration by age class for passerines banded at Long Point Bird Observatory from 1984 to 1998. Mean capture dates of after-second-year (ASY) males were earlier than second-year (SY) males for 19 of 20 species, 16 significantly so. Mean capture dates of ASY females were earlier than SY females for 11 of 12 species, 8 significantly so. There was no significant difference in the timing of migration between age classes for males of species with highly distinctive SY plumages and males of other species with more subtle plumage differences between age classes. For 12 species with adequate samples of both sexes, the mean difference in capture dates between age classes was significantly greater for males (3.5 days) than for females (2.1 days). These results suggest that differential migration by age class is widespread among passerines and that factors leading to the delayed arrival of young males also may affect females, though to a lesser extent.
Citation Details
Title: Age-related differential timing of spring migration within sexes in passerines.
Author: Rebecca L.M. Stewart
Publication:Wilson Bulletin (Refereed)
Date: June 1, 2002
Publisher: Wilson Ornithological Society
Volume: 114 Issue: 2 Page: 264(8)
Distributed by Thomson Gale
