Translator Disclaimer
1 May 2000 PHILOPATRY TO STOPOVER SITE AND BODY CONDITION OF TRANSIENT REED WARBLERS DURING AUTUMN MIGRATION THROUGH ISRAEL
Author Affiliations +
Abstract

Philopatry to stopover site and changes in body condition of migrating Reed Warblers Acrocephalus scirpaceus were studied in Bet Shean Valley, Israel, where warblers were netted throughout the year. Although the majority of birds were seen only once, the proportion of transients seen twice or more in different years is comparable to the figure for summer residents returning between years, indicating a high degree of philopatry among transients. Transients get heavier with longer duration of stay, up to about 15 days, after which body mass increase appears to level off at about 3 g. Change in body condition, taken to be body mass divided by wing length, also was noted, albeit of less significance. The mean date of arrival in the autumn of birds in their first year was about 20 days later than that of older birds. Reed Warblers use their time effectively to replenish their body mass and improve their condition before starting the dangerous crossing of the Sahara Desert.

Kobi Merom, Yoram Yom-Tov, and Robin McClery "PHILOPATRY TO STOPOVER SITE AND BODY CONDITION OF TRANSIENT REED WARBLERS DURING AUTUMN MIGRATION THROUGH ISRAEL," The Condor 102(2), 441-444, (1 May 2000). https://doi.org/10.1650/0010-5422(2000)102[0441:PTSSAB]2.0.CO;2
Received: 9 February 1999; Accepted: 1 January 2000; Published: 1 May 2000
JOURNAL ARTICLE
4 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top