東海岸のシギ・チドリ類で「旅繁殖」の直接的証拠を発見(URI-led team finds direct evidence of ‘itinerant breeding’ in East Coast shorebird species)

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2024-04-17 ロードアイランド大学(URI)

ロードアイランド大学の研究で、アメリカヤマシギが移動期と繁殖期が重なる珍しい「放浪繁殖」戦略を採用していることが明らかにされました。この戦略では、メスが移動中に複数回繁殖し、繁殖地間で平均800キロメートルを移動します。放浪繁殖は、環境変化に対する柔軟な適応として機能し、低い繁殖コストと様々な森林生息地の利用が可能です。これは、人間の開発や気候変動が進行する中で、放浪繁殖者が直面する課題に対する洞察を提供します。

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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

東海岸のシギ・チドリ類で「旅繁殖」の直接的証拠を発見(URI-led team finds direct evidence of ‘itinerant breeding’ in East Coast shorebird species)

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.

生物環境工学
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