Phylogenomics of an extra-Antarctic notothenioid radiation reveals a previously unrecognized lineage and diffuse species boundaries ...

Background: The impressive adaptive radiation of notothenioid fishes in Antarctic waters is generally thought to have been facilitated by an evolutionary key innovation, antifreeze glycoproteins, permitting the rapid evolution of more than 120 species subsequent to the Antarctic glaciation. By way o...

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Bibliographic Details
Main Authors: Ceballos, Santiago G, Roesti, Marius, Matschiner, Michael, Fernández, Daniel A, Damerau, Malte, Hanel, Reinhold, Salzburger, Walter
Format: Text
Language:English
Published: BioMed Central 2019
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Online Access:https://dx.doi.org/10.14288/1.0376039
https://doi.library.ubc.ca/10.14288/1.0376039
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Summary:Background: The impressive adaptive radiation of notothenioid fishes in Antarctic waters is generally thought to have been facilitated by an evolutionary key innovation, antifreeze glycoproteins, permitting the rapid evolution of more than 120 species subsequent to the Antarctic glaciation. By way of contrast, the second-most species-rich notothenioid genus, Patagonotothen, which is nested within the Antarctic clade of Notothenioidei, is almost exclusively found in the non-Antarctic waters of Patagonia. While the drivers of the diversification of Patagonotothen are currently unknown, they are unlikely to be related to antifreeze glycoproteins, given that water temperatures in Patagonia are well above freezing point. Here we performed a phylogenetic analysis based on genome-wide single nucleotide polymorphisms (SNPs) derived from restriction site-associated DNA sequencing (RADseq) in a total of twelve Patagonotothen species. Results: We present a well-supported, time-calibrated phylogenetic hypothesis ...