The Antitropical Factor in Cetacean Speciation

Davies, J. L.

doi:10.2307/2406339

Cited by 50 publications

(37 citation statements)

References 6 publications

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“…Although our limited knowledge about Kogia makes it difficult to explain fully the reciprocal monophyly we observed within K. sima, any explanation must take into account the biogeographic history and ecology of the species. During the Pleistocene, the Cape of Good Hope was an intermittent barrier to movement of tropical species between the Atlantic and Indo-Pacific Oceans (Davies 1963) and, as one example, Perrin et al (1978Perrin et al ( , 1981 hypothesized that speciation within tropical Stenella species resulted from isolation of populations occupying Atlantic Table 3. The average pairwise differences between the combined mitochondrial DNA control region and cytochrome b haplotypes for each clade resolved in phylogenetic reconstructions are in the cells below the diagonal and the within clade differences are on the diagonal.…”

Section: Resultsmentioning

confidence: 99%

Genetic Variation of Kogia Spp. With Preliminary Evidence for Two Species of Kogia Sima

et al. 2005

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Concordance between mitochondrial DNA (mtDNA) markers and morphologically based species identifications was examined for the two currently recognized Kogia species. We sequenced 406 base pairs of the control region and 398 base pairs of the cytochrome b gene from 108 Kogia breviceps and 47 K. sima samples. As expected, the two sister species were reciprocally monophyletic to each other in phylogenetic reconstructions, but within K. sima, we unexpectedly observed another reciprocally monophyletic relationship. The two K. sima clades resolved were phylogeographically concordant with all of the haplotypes in one clade observed solely among specimens sampled from the Atlantic Ocean and with those in the other clade observed solely among specimens sampled from the Indo-Pacific Ocean. These apparently allopatric clades were observed in all phylogenetic reconstructions using the maximum parsimony, maximum likelihood, and neighborjoining algorithms, with the mtDNA gene sequences analyzed separately and combined. The nucleotide diversity for the combined gene sequence haplotypes of the two K. sima clades resolved in our analyses was 0.58% and 1.03% for the Atlantic and Indo-Pacific, respectively, whereas for the two recognized sister species, nucleotide diversity was 1.65% and 4.02% for K. breviceps and K. sima, respectively. The combined gene sequence haplotypes have accumulated 44 fixed base pair differences between the two K. sima clades compared to 20 fixed base pair differences between the two recognized sister species. Although our results

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Section: Resultsmentioning

confidence: 99%

Genetic Variation of Kogia Spp. With Preliminary Evidence for Two Species of Kogia Sima

et al. 2005

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“…Homoplasy was minimal with the 13 nuclear loci as indicated by high CI (consistency index) and RI (retention index) values (figure 1a) but cannot be discounted even between closely related species (O'hUigin et al 2002). Hybridization is unlikely owing to the antitropical distribution of right whales and their offset breeding seasons (Davies 1963;Rosenbaum et al 2000). Retention of ancestral polymorphisms is a plausible explanation for incongruence among loci in right whales because the internode branch length was relatively short between North Atlantic right whales and the subsequent divergence of southern and North Pacific right whales (Davies 1963;Slade et al 1994;Moore 1995;Rosenbaum et al 2000;Broughton & Harrison 2003).…”

Section: Discussion (A) Utility Of Nuclear Locimentioning

confidence: 99%

Nuclear markers confirm taxonomic status and relationships among highly endangered and closely related right whale species

et al. 2005

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Right whales (genus: Eubalaena) are among the most endangered mammals, yet their taxonomy and phylogeny have been questioned. A phylogenetic hypothesis based on mitochondrial DNA (mtDNA) variation recently prompted a taxonomic revision, increasing the number of right whale species to three. We critically evaluated this hypothesis using sequence data from 13 nuclear DNA (nuDNA) loci as well as the mtDNA control region. Fixed diagnostic characters among the nuclear markers strongly support the hypothesis of three genetically distinct species, despite the lack of any diagnostic morphological characters. A phylogenetic analysis of all data produced a strict consensus cladogram with strong support at nodes that define each right whale species as well as relationships among species. Results showed very little conflict among the individual partitions as well as congruence between the mtDNA and nuDNA datasets. These data clearly demonstrate the strength of using numerous independent genetic markers during a phylogenetic analysis of closely related species. In evaluating phylogenetic support contributed by individual loci, 11 of the 14 loci provided support for at least one of the nodes of interest to this study. Only a single marker (mtDNA control region) provided support at all four nodes. A study using any single nuclear marker would have failed to support the proposed phylogeny, and a strong phylogenetic hypothesis was only revealed by the simultaneous analysis of many nuclear loci. In addition, nuDNA and mtDNA data provided complementary levels of support at nodes of different evolutionary depth indicating that the combined use of mtDNA and nuDNA data is both practical and desirable.

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“…Therefore, processes which affect population structure, such as dispersion and growth, occur at large geogra phic scales, such as the interhemispheric gene flow among humpback whales Me gaptera novaeangliae of the eastern Pacific (Baker et al 1993, Medrano-González et al 2001. Studies on genetic variation (Bérubé et al 2002, Escorza-Trevino et al 2002, Schramm Urrutia 2002, Natoli et al 2006 as well as on distribution and morphological variation (Davies 1963, Perrin 1984, Perrin et al 1985, Ballance et al 2006, Fiedler & Talley 2006 of marine mammals in the eastern Tropical Pacific show that different species share some aspects of their population structure and history, as their geographic distributions were shaped by (Perrin 1984, Perrin et al 1985, Rosel et al 1994, Escorza-Trevino et al 2002, Natoli et al 2006). Analysis of Rβ shows poorly defined patterns (Fig.…”

Section: Discussionmentioning

confidence: 99%

Macroecology of marine mammal species in the Mexican Pacific Ocean: diversity and distribution

Rosales‐Nanduca¹,

Gerrodette²,

Urbán-R.³

et al. 2011

Mar. Ecol. Prog. Ser.

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The Antitropical Factor in Cetacean Speciation

Cited by 50 publications

References 6 publications

Genetic Variation of Kogia Spp. With Preliminary Evidence for Two Species of Kogia Sima

Genetic Variation of Kogia Spp. With Preliminary Evidence for Two Species of Kogia Sima

Nuclear markers confirm taxonomic status and relationships among highly endangered and closely related right whale species

Macroecology of marine mammal species in the Mexican Pacific Ocean: diversity and distribution

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