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

Seasonal migration is an underappreciated driver of animal diversification. Changes in migratory behavior may favor 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 behavior – 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..., , , # Data from: The importance of migratory drop-off for island colonization in birds

[https://doi.org/10.5061/dryad.3tx95x6pk](https://doi.org/10.5061/dryad.3tx95x6pk)

This file contains:

1\. A table containing all species’ migration characteristics, range size, inferred flock size, and relative brain size data (Supplementary Data 1).

2\. A table containing all details regarding the evolutionary history and migratory behavior of island endemic and related species (Supplementary Data 2).

Each table (.xlsx format) contains a metadata sheet on the front page with descriptions of each column. Note that empty cells in Supplementary Data 1 and Supplementary Data have been replaced by \"-\" to avoid confusion for potential users.

Bird range maps and diet data are publicly available, respectively in [www.birdlife.org](http://www.birdlife.org) and Wilman *et al.* (2014, doi:10.1890/13-1917.1).

For any question or request please contact: Paul Dufour ([[e-mail])](mailto:paul.duf...