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Contrasting patterns of population structure of Bulwer’s petrel (Bulweria bulwerii) between oceans revealed by statistical phylogeography
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Abstract(s)
The patterns of population divergence of mid-latitude marine birds are impacted by only a few
biogeographic barriers to dispersal and the efect of intrinsic factors, such as fdelity to natal colonies
or wintering grounds, may become more conspicuous. Here we describe, for the frst time, the
phylogeographic patterns and historical demography of Bulwer’s petrel Bulweria bulwerii and provide
new insights regarding the drivers of species diversifcation in the marine environment. We sampled
Bulwer’s petrels from the main breeding colonies and used a statistical phylogeography approach
based on surveying nuclear and mitochondrial loci (~9100 bp) to study its mechanisms of global
diversifcation. We uncovered three highly diferentiated groups including the Western Pacifc, the
Central Pacifc and the Atlantic. The older divergence occurred within the Pacifc Ocean, ca. 850,000
ya, and since then the W Pacifc group has been evolving in isolation. Conversely, divergence between
the Central Pacifc and Atlantic populations occurred within the last 200,000 years. While the Isthmus
of Panama is important in restricting gene fow between oceans in Bulwer’s petrels, the deepest
phylogeographic break is within the Pacifc Ocean, where oceanographic barriers are key in driving and
maintaining the remarkable structure found in this highly mobile seabird. This is in contrast with the
Atlantic, where no structure was detected. Further data will provide insights regarding the extent of
lineage divergence of Bulwer’s petrels in the Western Pacifc.
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Citation
Silva, M. C., Catry, P., Bried, J., Kawakami, K., Flint, E., & Granadeiro, J. P. (2023). Contrasting patterns of population structure of Bulwer’s petrel (Bulweria bulwerii) between oceans revealed by statistical phylogeography. Scientific Reports, 13(1), 1–11. https://doi.org/10.1038/s41598-023-28452-z
Publisher
Nature Publishing Group