Selection on ancestral genetic variation fuels repeated ecotype formation in bottlenose dolphins

Louis, Marie; Galimberti, Marco; Archer, Frederick; Berrow, Simon; Brownlow, Andrew; Fallon, Ramon; Nykänen, Milaja; O’Brien, Joanne; Roberston, Kelly M.; Rosel, Patricia E.; Simon-Bouhet, Benoit; Wegmann, Daniel; Fontaine, Michael C.; Foote, Andrew D.; Gaggiotti, Oscar E.

doi:10.1126/sciadv.abg1245

i

Selection on ancestral genetic variation fuels repeated ecotype formation in bottlenose dolphins

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2021
By Louis, Marie ; Galimberti, Marco ; Archer, Frederick ; ...

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Journal Title:

Science Advances
Personal Author:

Louis, Marie ; Galimberti, Marco ; Archer, Frederick ; Berrow, Simon ; Brownlow, Andrew ; Fallon, Ramon ; Nykänen, Milaja ; O’Brien, Joanne ; Roberston, Kelly M. ; Rosel, Patricia E. ; Simon-Bouhet, Benoit ; Wegmann, Daniel ; Fontaine, Michael C. ; Foote, Andrew D. ; Gaggiotti, Oscar E.
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center) ; SWFSC (Southwest Fisheries Science Center)
Description:

Studying repeated adaptation can provide insights into the mechanisms allowing species to adapt to novel environments. Here, we investigate repeated evolution driven by habitat specialization in the common bottlenose dolphin. Parapatric pelagic and coastal ecotypes of common bottlenose dolphins have repeatedly formed across the oceans. Analyzing whole genomes of 57 individuals, we find that ecotype evolution involved a complex reticulated evolutionary history. We find parallel linked selection acted upon ancient alleles in geographically distant coastal populations, which were present as standing genetic variation in the pelagic populations. Candidate loci evolving under parallel linked selection were found in ancient tracts, suggesting recurrent bouts of selection through time. Therefore, despite the constraints of small effective population size and long generation time on the efficacy of selection, repeated adaptation in long-lived social species can be driven by a combination of ecological opportunities and selection acting on ancestral standing genetic variation.
Keywords:

Adaptation (Biology) Bottlenose Dolphin Genetics Bottlenose Dolphin Multidisciplinary
Source:

Science Advances, 7(44), eabg1245
DOI:

https://doi.org/10.1126/sciadv.abg1245
Document Type:

Journal Article
Rights Information:

CC BY-NC
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Submitted
Main Document Checksum:

urn:sha256:8c87c41dd9ec53f685ae305c49967f3cb0eba82a30f4adc65834feed200785f7
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https://repository.library.noaa.gov/view/noaa/47265/noaa_47265_DS1.pdf
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[PDF - 2.16 MB ]

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