Journal
CONSERVATION GENETICS
Volume 19, Issue 6, Pages 1349-1365Publisher
SPRINGER
DOI: 10.1007/s10592-018-1105-4
Keywords
Bryde's whale; Balaenoptera edeni; Balaenoptera brydei; Southern Africa; MtDNA control region; Phylogenetics
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Funding
- Centre for Dolphin Studies
- Rufford Foundation
- Society for Marine Mammalogy
- Mammal Research Institute Whale Unit (University of Pretoria)
- Sea Mammal Research Unit (University of St Andrews)
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Bryde's whales (Balaenoptera edeni) are medium-sized balaenopterids with tropical and subtropical distribution. There is confusion about the number of species, subspecies and populations of Bryde's whale found globally. Two eco-types occur off South Africa, the inshore and offshore forms, but with unknown relationship between them. Using the mtDNA control region we investigated the phylogenetic relationship of these populations to each other and other Bryde's whale populations. Skin, baleen and bone samples were collected from biopsy-sampled individuals, strandings and museum collections. 97 sequences of 674bp (bp) length were compared with published sequences of Bryde's whales (n=6) and two similar species, Omura's (B. omurai) and sei (B. borealis) whales (n=3). We found eight haplotypes from the study samples: H1-H4 formed a distinct, sister clade to pelagic populations of Bryde's whales (B. brydei) from the South Pacific, North Pacific and Eastern Indian Ocean. H5-H8 were included in the pelagic clade. H1-H4 represented samples from within the distributional range of the inshore form. Pairwise comparisons of the percentage of nucleotide differences between sequences revealed that inshore haplotypes differed from published sequences of B. edeni by 4.7-5.5% and from B. brydei by 1.8-2.1%. Ten fixed differences between inshore and offshore sequences supported 100% diagnosability as subspecies. Phylogenetic analyses grouped the South African populations within the Bryde's-sei whale clade and excluded B. edeni. Our data, combined with morphological and ecological evidence from previous studies, support subspecific classification of both South African forms under B. brydei and complete separation from B. edeni.
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