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- W4323347741 abstract "ABSTRACT Beringia is a biogeographically dynamic region that extends from northeastern Asia into northwestern North America. This region has affected avian divergence and speciation in three important ways: ( i ) by serving as a route for intercontinental colonisation between Asia and the Americas; ( ii ) by cyclically splitting (and often reuniting) populations, subspecies, and species between these continents; and ( iii ) by providing isolated refugia through glacial cycles. The effects of these processes can be seen in taxonomic splits of shallow to increasing depths and in the presence of regional endemics. We review the taxa involved in the latter two processes (splitting–reuniting and isolation), with a focus on three research topics: avian diversity, time estimates of the generation of that diversity, and the regions within Beringia that might have been especially important. We find that these processes have generated substantial amounts of avian diversity, including 49 pairs of avian subspecies or species whose breeding distributions largely replace one another across the divide between the Old World and the New World in Beringia, and 103 avian species and subspecies endemic to this region. Among endemics, about one in three is recognised as a full biological species. Endemic taxa in the orders Charadriiformes (shorebirds, alcids, gulls, and terns) and Passeriformes (perching birds) are particularly well represented, although they show very different levels of diversity through evolutionary time. Endemic Beringian Charadriiformes have a 1.31:1 ratio of species to subspecies. In Passeriformes, endemic taxa have a 0.09:1 species‐to‐subspecies ratio, suggesting that passerine (and thus terrestrial) endemism might be more prone to long‐term extinction in this region, although such ‘losses’ could occur through their being reconnected with wider continental populations during favourable climatic cycles (e.g. subspecies reintegration with other populations). Genetic evidence suggests that most Beringian avian taxa originated over the past 3 million years, confirming the importance of Quaternary processes. There seems to be no obvious clustering in their formation through time, although there might be temporal gaps with lower rates of diversity generation. For at least 62 species, taxonomically undifferentiated populations occupy this region, providing ample potential for future evolutionary diversification." @default.
- W4323347741 created "2023-03-08" @default.
- W4323347741 creator A5032262383 @default.
- W4323347741 creator A5035122787 @default.
- W4323347741 creator A5071791000 @default.
- W4323347741 creator A5076043932 @default.
- W4323347741 date "2023-03-06" @default.
- W4323347741 modified "2023-10-17" @default.
- W4323347741 title "Beringia as a high‐latitude engine of avian speciation" @default.
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