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The importance of migratory drop-off for island colonization in birds

Dufour, Paul; Sayol, Ferran; Cooke, Rob; Blackburn, Tim M; Gallien, Laure; Griesser, Michael; Steinbauer, Manuel J; (2024) The importance of migratory drop-off for island colonization in birds. Proceedings of the Royal Society B: Biological Sciences , 291 (2021) , Article 20232926. 10.1098/rspb.2023.2926. Green open access

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Abstract

Seasonal migration is an underappreciated driver of animal diversification. Changes in migratory behaviour may favour the establishment of sedentary founder populations and promote speciation if there is sufficient reproductive isolation between sedentary and migratory populations. From a systematic literature review, we here quantify the role of migratory drop-off-the loss of migratory behaviour-in promoting speciation in birds on islands. We identify at least 157 independent colonization events likely initiated by migratory species that led to speciation, including 44 cases among recently extinct species. By comparing, for all islands, the proportion of island endemic species that derived from migratory drop-off with the proportion of migratory species among potential colonizers, we showed that seasonal migration has a larger effect on island endemic richness than direct dispersal. We also found that the role of migration in island colonization increases with the geographic isolation of islands. Furthermore, the success of speciation events depends in part on species biogeographic and ecological factors, here positively associated with greater range size and larger flock sizes. These results highlight the importance of shifts in migratory behaviour in the speciation process and calls for greater consideration of migratory drop-off in the biogeographic distribution of birds.

Type: Article
Title: The importance of migratory drop-off for island colonization in birds
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1098/rspb.2023.2926
Publisher version: http://dx.doi.org/10.1098/rspb.2023.2926
Language: English
Additional information: © 2024 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Keywords: birds, extinct species, island biogeography, long-distance dispersal, seasonal migration, Animals, Birds, Phylogeny
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10191129
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