Show simple item record Walter, Ryan P. Roy, Denis Hussey, Nigel E. Stelbrink, Björn Kovacs, Kit M. Lydersen, Christian McMeans, Bailey C. Svavarsson, Jörundur Kessel, Steven T. Biton Porsmoguer, Sebastian Wildes, Sharon Tribuzio, Cindy A. Campana, Steven E. Petersen, Stephen D. Grubbs, R. Dean Heath, Daniel D. Hedges, Kevin J. Fisk, Aaron T.
dc.coverage.spatial Canadian Arctic
dc.coverage.spatial Greenland
dc.coverage.spatial Iceland
dc.coverage.spatial Svalbard
dc.coverage.spatial Gulf of Mexico
dc.coverage.spatial Azores 2017-09-12T21:02:54Z 2017-09-12T21:02:54Z 2017-09-09
dc.identifier doi:10.5061/dryad.p6q3s
dc.identifier.citation Walter RP, Roy D, Hussey NE, Stelbrink B, Kovacs KM, Lydersen C, McMeans BC, Svavarsson J, Kessel ST, Biton Porsmoguer S, Wildes S, Tribuzio CA, Campana SE, Petersen SD, Grubbs RD, Heath DD, Hedges KJ, Fisk AT (2017) Origins of the Greenland shark (Somniosus microcephalus ): Impacts of ice-olation and introgression. Ecology and Evolution 7(19): 8113-8125.
dc.description Herein, we use genetic data from 277 sleeper sharks to perform coalescent-based modeling to test the hypothesis of early Quaternary emergence of the Greenland shark (Somniosus microcephalus) from ancestral sleeper sharks in the Canadian Arctic-Subarctic region. Our results show that morphologically cryptic somniosids S. microcephalus and Somniosus pacificus can be genetically distinguished using combined mitochondrial and nuclear DNA markers. Our data confirm the presence of genetically admixed individuals in the Canadian Arctic and sub-Arctic, and temperate Eastern Atlantic regions, suggesting introgressive hybridization upon secondary contact following the initial species divergence. Conservative substitution rates fitted to an Isolation with Migration (IM) model indicate a likely species divergence time of 2.34 Ma, using the mitochondrial sequence DNA, which in conjunction with the geographic distribution of admixtures and Pacific signatures likely indicates speciation associated with processes other than the closing of the Isthmus of Panama. This time span coincides with further planetary cooling in the early Quaternary period followed by the onset of oscillating glacial-interglacial cycles. We propose that the initial S. microcephalus–S. pacificus split, and subsequent hybridization events, were likely associated with the onset of Pleistocene glacial oscillations, whereby fluctuating sea levels constrained connectivity among Arctic oceanic basins, Arctic marginal seas, and the North Atlantic Ocean. Our data demonstrates support for the evolutionary consequences of oscillatory vicariance via transient oceanic isolation with subsequent secondary contact associated with fluctuating sea levels throughout the Quaternary period—which may serve as a model for the origins of Arctic marine fauna on a broad taxonomic scale.
dc.relation.haspart doi:10.5061/dryad.p6q3s/1
dc.relation.haspart doi:10.5061/dryad.p6q3s/2
dc.relation.isreferencedby doi:10.1002/ece3.3325
dc.subject Sleeper shark
dc.subject mtDNA
dc.subject cytochrome b
dc.subject haplotypes
dc.title Data from: Origins of the Greenland shark (Somniosus microcephalus): impacts of ice-olation and introgression
dc.type Article
dwc.ScientificName Somniosus microcephalus
dwc.ScientificName Somniosus pacificus
dwc.ScientificName Somniosus spp.
dc.contributor.correspondingAuthor Walter, Ryan
prism.publicationName Ecology and Evolution

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Title 61 haplotypes cytb 702 bases in phylip format
Downloaded 1 time
Description Phylip file listing 61 haplotypes of partial reads of the mtDNA cytochrome b gene used in Walter et al., The first 22 haplotypes originally published in Murray et al. (2008 - Mar Biol): H1-H22. Eight haplotypes reported in Hussey et al. (2015 - Polar Biol): H28 H38 H41 H43 H46, H48, H50, H53. all other recovered as novel sequences in Walter et al.
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At the request of the author, this item is embargoed until 2018-09-08
Title RAG1 and ITS2 GenBank accession numbers: MF555591-MF555594
Description GenBank Accession numbers for partial nuclear sequences for the RAG1 locus, and ITS2 locus with flanking 5.8S and 28S regions associated with Somniosus microcephalus and Somniosus pacificus.
Download ../nuccore/?term=MF555591,MF555592,MF55559...55594 (0 bytes)
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