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Palaeoclimatic changes resulted in range expansion and subsequent divergence in brown fur seals, Arctocephalus pusillus
journal contribution
posted on 2022-11-23, 05:09 authored by A Malan, S Von Der Heyden, S Herron, John ArnouldJohn Arnould, R Kirkwood, CA MattheePast climatic change as a driving force of marine diversification is still largely unclear, particularly for Southern Hemisphere species. Here, we present a case using the brown fur seal,
Arctocephalus pusillus,
assessing the geographical structure and demographic history using mitochondrial and nuclear data. Results show the two previously defined subspecies (one from Australia and the other from southern Africa) are phylogeographically distinct. Migration analyses based on nuclear data suggest the absence of migrants among the two genetically close assemblages. The demographic history of
A. pusillus
is characterized by a glacial population expansion (approx. 18 kya) in the southern African lineage, which coincides with time estimates of population expansion of prey species of seals. Approximate Bayesian calculations support an eastward dispersal event during the Last Glacial Maximum when sea levels were lower, followed by a postglacial divergence event, approximately 13 kya. The demographic history of the brown fur seal in the Southern Oceans provides support that recent palaeoclimatic changes could have facilitated expansions in some marine species and that postglacial sea-level rise may have acted as a dispersal barrier for species mostly confined to continental shelves.
History
Journal
Biology LettersVolume
18Article number
20220285Pagination
1-7Location
London, Eng.Publisher DOI
ISSN
1744-9561eISSN
1744-957XLanguage
EnglishPublication classification
C1 Refereed article in a scholarly journalIssue
8Publisher
Royal Society PublishingUsage metrics
Keywords
Biologydemographic historyDNA-SEQUENCEDYNAMICSEcologyEnvironmental Sciences & EcologyEVOLUTIONEvolutionary Biologyfur sealsINFERENCELast Glacial MaximumLife Sciences & BiomedicineLife Sciences & Biomedicine - Other TopicsMARINE BIOGEOGRAPHYmicrosatellitesmitochondrial DNAOTARIIDAEpalaeoclimatePOLYMORPHISMPOPULATION-STRUCTUREREVEALScience & TechnologySOFTWAREAnimalsAustraliaBayes TheoremFur SealsOceans and SeasSeals, Earless13 Climate ActionSchool of Life and Environmental SciencesFaculty of Science Engineering and Built EnvironmentBiological SciencesEvolutionary Biology
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