Abstract
ABSTRACTAimUnderstanding how wild populations respond to climatic shifts is a fundamental goal of biological research in a fast-changing world. The Southern Ocean represents a fascinating system for assessing large-scale climate-driven biological change, as it contains extremely isolated island groups within a predominantly westerly, circumpolar wind and current system. The blue-eyed shags (Leucocarbo spp.) represent a paradoxical Southern Ocean seabird radiation; a circumpolar distribution implies strong dispersal capacity yet their speciose nature suggests local adaptation and isolation. Here we use genetic tools in an attempt to resolve this paradox.LocationSouthern Ocean.Taxa17 species and subspecies of blue-eyed shags (Leucocarbo spp.) across the geographical distribution of the genus.MethodsHere we use mitochondrial and nuclear sequence data to conduct the first global genetic analysis of this group using a temporal phylogenetic framework to test for rapid speciation.ResultsOur analysis reveals remarkably shallow evolutionary histories among island-endemic lineages, consistent with a recent high-latitude circumpolar radiation. This rapid sub-Antarctic expansion contrasts with significantly deeper lineages detected in more temperate regions such as South America and New Zealand that may have acted as glacial refugia. The dynamic history of high-latitude expansions is further supported by ancestral demographic and biogeographic reconstructions.Main conclusionsThe circumpolar distribution of blue-eyed shags, and their highly dynamic evolutionary history, potentially make Leucocarbo a strong sentinel of past and ongoing Southern Ocean ecosystem change given their sensitivity to climatic impacts.
Publisher
Cold Spring Harbor Laboratory
Reference70 articles.
1. Alexander, W. B. (1928). Birds of the ocean: A handbook for voyagers, containing descriptions of all the sea-birds of the world, with notes on their habits and guides to their identification. New York: Putnam.
2. The origins of the enigmatic Falklands Islands wolf;Nature Communications,2013
3. Fifty million years of beetle evolution along the Antarctic Polar Front
4. Heart rates and abdominal temperatures of free-ranging South Georgian shags, Phalacrocorax georgianus;Journal of Experimental Biology,1997
5. Report of the curator, Zoological Department;Journal of the Asiatic Society of Bengal,1860
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