Interspecific gene flow and the evolution of specialisation in black and white rhinoceros

Moodley, Yoshan, Westbury, Michael V., Russo, Isa-Rita M. ORCID: https://orcid.org/0000-0001-9504-3633, Gopalakrishnan, Shyam, Rakotoarivelo, Andrinajoro, Olsen, Remi-Andre, Prost, Stefan, Tunstall, Tate, Ryder, Oliver A., Dalen, Love and Bruford, Michael W. ORCID: https://orcid.org/0000-0001-6357-6080 2020. Interspecific gene flow and the evolution of specialisation in black and white rhinoceros. Molecular Biology and Evolution 37 (11) , pp. 3105-3117. 10.1093/molbev/msaa148

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Abstract

Africa’s black (Diceros bicornis) and white (Ceratotherium simum) rhinoceros are closely related sister-taxa that evolved highly divergent obligate browsing and grazing feeding strategies. Although their precursor species D. praecox and C. mauritanicum appear in the fossil record ∼5.2 million years ago (Ma), by 4 Ma both were still mixed feeders, and were even spatio-temporally sympatric at several Pliocene sites in what is today Africa’s Rift Valley. Here, we ask whether or not D. praecox and C. mauritanicum were reproductively isolated when they came into Pliocene secondary contact. We sequenced and de novo assembled the first annotated black rhinoceros reference genome, and compared it with available genomes of other black and white rhinoceros. We show that ancestral gene flow between D. praecox and C. mauritanicum ceased sometime between 3.3 and 4.1 Ma, despite conventional methods for the detection of gene flow from whole genome data returning false positive signatures of recent interspecific migration due to incomplete lineage sorting. We propose that ongoing Pliocene genetic exchange, for up to 2 million years after initial divergence, could have potentially hindered the development of obligate feeding strategies until both species were fully reproductively isolated, but that the more severe and shifting palaeoclimate of the early Pleistocene was likely the ultimate driver of ecological specialisation in African rhinoceros.

Item Type:	Article
Date Type:	Publication
Status:	Published
Publisher:	Oxford University Press
ISSN:	0737-4038
Date of First Compliant Deposit:	11 June 2020
Date of Acceptance:	4 June 2020
Last Modified:	06 Nov 2024 01:00
URI:	https://orca.cardiff.ac.uk/id/eprint/132358

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