2024-04-17 ロードアイランド大学(URI)
<関連情報>
- https://www.uri.edu/news/2024/04/uri-led-team-finds-direct-evidence-of-itinerant-breeding-in-east-coast-shorebird-species/
- https://royalsocietypublishing.org/doi/10.1098/rspb.2024.0021
渡り鳥の型破りな生活史:繁殖と移動を分離する Unconventional life history in a migratory shorebird: desegregating reproduction and migration
Colby R. Slezak,Erik J. Blomberg,Amber M. Roth,Liam A. Berigan,Alexander C. Fish,Rachel Darling,Sarah J. Clements,Greg Balkcom,Bobbi Carpenter,Gary Costanzo,Jeffrey Duguay,Clayton L. Graham,William Harvey,Michael Hook, …
Proceedings of the Royal Society B Published:17 April 2024
DOI:https://doi.org/10.1098/rspb.2024.0021
Abstract
Conventional life-history theory predicts that energy-demanding events such as reproduction and migration must be temporally segregated to avoid resource limitation. Here, we provide, to our knowledge, the first direct evidence of ‘itinerant breeding’ in a migratory bird, an incredibly rare breeding strategy (less than 0.1% of extant bird species) that involves the temporal overlap of migratory and reproductive periods of the annual cycle. Based on GPS-tracking of over 200 female American woodcock, most female woodcock (greater than 80%) nested more than once (some up to six times) with short re-nest intervals, and females moved northwards on average 800 km between first and second nests, and then smaller distances (ca 200+ km) between subsequent nesting attempts. Reliance on ephemeral habitat for breeding, ground-nesting and key aspects of life history that reduce both the costs of reproduction and migration probably explain the prevalence of this rare phenotype in woodcock and why itinerant breeding so rarely occurs in other bird species.
