[MARMAM] New publication on bottlenose dolphin postglacial colonization

Milaja Nykänen milaja.ny at gmail.com
Tue Aug 20 08:09:52 PDT 2019


Dear Colleagues,

On behalf of my co-authors, I'd like to draw your attention to a recently
published (as an advance) paper on bottlenose dolphin postglacial
colonization:

Milaja Nykänen, Kristin Kaschner, Willy Dabin, Andrew Brownlow, Nicholas J
Davison, Rob Deaville, Cristina Garilao, Kathleen Kesner-Reyes, M Thomas P
Gilbert, Rod Penrose, Valentina Islas-Villanueva, Nathan Wales, Simon N
Ingram, Emer Rogan, Marie Louis, Andrew D Foote. 2019. Postglacial
Colonization of Northern Coastal Habitat by Bottlenose Dolphins: A Marine
Leading-Edge Expansion? Journal of Heredity, esz039,
https://doi.org/10.1093/jhered/esz039

Abstract
Oscillations in the Earth’s temperature and the subsequent retreating and
advancing of ice-sheets around the polar regions are thought to have played
an important role in shaping the distribution and genetic structuring of
contemporary high-latitude populations. After the Last Glacial Maximum
(LGM), retreating of the ice-sheets would have enabled early colonizers to
rapidly occupy suitable niches to the exclusion of other conspecifics,
thereby reducing genetic diversity at the leading-edge. Bottlenose dolphins
(genus *Tursiops*) form distinct coastal and pelagic ecotypes, with
finer-scale genetic structuring observed within each ecotype. We
reconstruct the postglacial colonization of the Northeast Atlantic (NEA) by
bottlenose dolphins using habitat modeling and phylogenetics. The AquaMaps
model hindcasted suitable habitat for the LGM in the Atlantic lower
latitude waters and parts of the Mediterranean Sea. The time-calibrated
phylogeny, constructed with 86 complete mitochondrial genomes including 30
generated for this study and created using a multispecies coalescent model,
suggests that the expansion to the available coastal habitat in the NEA
happened via founder events starting ~15 000 years ago (95% highest
posterior density interval: 4 900–26 400). The founders of the 2 distinct
coastal NEA populations comprised as few as 2 maternal lineages that
originated from the pelagic population. The low effective population size
and genetic diversity estimated for the shared ancestral coastal population
subsequent to divergence from the pelagic source population are consistent
with leading-edge expansion. These findings highlight the legacy of the
Late Pleistocene glacial cycles on the genetic structuring and diversity of
contemporary populations.

If you would like a PDF copy of the article, please do not hesitate to
contact me (milaja.ny at gmail.com). The article is also available at:
https://doi.org/10.1093/jhered/esz039


Kind regards,
Milaja Nykanen

-- 
Dr Milaja Nykanen
School of Biological, Earth and Environmental Sciences,
University College Cork
Cork, Ireland

Mobile: +353 (0)85 110 1466
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.uvic.ca/pipermail/marmam/attachments/20190820/2227bbb8/attachment.html>


More information about the MARMAM mailing list