PHYLOGENETIC RELATIONSHIPS AMONG THE DELPHINID CETACEANS BASED ON FULL CYTOCHROME <i>B</i> SEQUENCES

LeDuc, Richard G.; Perrin, William F.; Dizon, Andrew E.

doi:10.1111/j.1748-7692.1999.tb00833.x

Cited by 280 publications

(362 citation statements)

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“…No entanto, a análise cladística das sequências de citocromo b indica um agrupamento diferente, onde Sousa aparece claramente separado dos outros dois gêneros (LEDUC et al 1999).…”

Section: Discussionunclassified

Morfologia do sincrânio do boto-cinza, Sotalia guianensis (P.J. van Bénéden) (Cetacea, Delphinidae)

Simões‐Lopes

2006

Rev. Bras. Zool.

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Apresenta-se uma descrição da morfologia comparada do sincrânio de Sotalia guianensis (P.J. van Bénéden, 1864), incluindo suas variações ontogenéticas e intra-específicas. As descrições foram baseadas em 51 crânios completos ou parciais depositados na coleção do laboratório de Mamíferos Aquáticos, do Departamento de Ecologia e Zoologia, CCB, Universidade Federal de Santa Catarina. O sincrânio é bastante homogêneo e manifesta sua assimetria na morfologia dos ossos, passagens nasais e forames. O rostro é proporcionalmente estreito em relação aos outros Delphinidae do mesmo porte. A região temporal é circular em indivíduos jovens, mas se torna oval nos adultos onde se forma uma crista temporal evidente. O forame elíptico do periótico está presente tanto em indivíduos jovens quanto adultos. Os nasais são bipartidos e podem ocorrer ossos suturais entre os frontais. O processo hamular dos pterigóides é bastante inflado e fenestrado. A sínfise mandibular alcança de 19 de 19-23% do comprimento do dentário. Cada pré-maxilar e maxilar possui de 30-35 dentes e cada dentário de 30-38 dentes.

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“…No entanto, a análise cladística das sequências de citocromo b indica um agrupamento diferente, onde Sousa aparece claramente separado dos outros dois gêneros (LEDUC et al 1999).…”

Section: Discussionunclassified

Morfologia do sincrânio do boto-cinza, Sotalia guianensis (P.J. van Bénéden) (Cetacea, Delphinidae)

Simões‐Lopes

2006

Rev. Bras. Zool.

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“…In addition to sequences available from previous studies of cetacean molecular systematics (Milinkovitch et al 1994;Arnason & Gullberg 1996;LeDuc et al 1999), we sequenced either the ribosomal gene fragments and/or the complete cytochrome b for non-overlapping taxa. In all, we generated 44 new sequences (GenBank accession numbers AF334482^AF334525).…”

Section: Methodsmentioning

confidence: 99%

Evolution of river dolphins

Hamilton

Caballero²,

Collins

et al. 2001

Proc. R. Soc. Lond. B

183

149

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The world's river dolphins (Inia, Pontoporia, Lipotes and Platanista) are among the least known and most endangered of all cetaceans. The four extant genera inhabit geographically disjunct river systems and exhibit highly modi¢ed morphologies, leading many cetologists to regard river dolphins as an unnatural group. Numerous arrangements have been proposed for their phylogenetic relationships to one another and to other odontocete cetaceans. These alternative views strongly a¡ect the biogeographical and evolutionary implications raised by the important, although limited, fossil record of river dolphins. We present a hypothesis of river dolphin relationships based on phylogenetic analysis of three mitochondrial genes for 29 cetacean species, concluding that the four genera represent three separate, ancient branches in odontocete evolution. Our molecular phylogeny corresponds well with the ¢rst fossil appearances of the primary lineages of modern odontocetes. Integrating relevant events in Tertiary palaeoceanography, we develop a scenario for river dolphin evolution during the globally high sea levels of the Middle Miocene. We suggest that ancestors of the four extant river dolphin lineages colonized the shallow epicontinental seas that inundated the Amazon, Parana¨, Yangtze and Indo-Gangetic river basins, subsequently remaining in these extensive waterways during their transition to freshwater with the Late Neogene trend of sea-level lowering.

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“…On the coast of Peru L. obscurus has a peak breeding period in September and October, offset by several months from the peak in the North Pacific L. obliquidens (Van Waerebeek and Read 1994). These species are sister taxa based on cranial (Miyazaki and Shikano 1997) and mtDNA characters (Cipriano 1997;LeDuc et al 1999). Divergence to the level of species is indicated by differences in reproductive phenology as well as morphologies and behaviors related to feeding (Miyazaki and Shikano 1997;Brownell and Cipriano 1999;, traits assumed here to be adaptive.…”

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confidence: 99%

Genetic Evidence on the Demography of Speciation in Allopatric Dolphin Species

2002

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Abstract. Under a neutral model, the stochastic lineage sorting that leads to gene monophyly proceeds slowly in large populations. Therefore, in many recent species with large population size, the genome will have mixed support for monophyly unless historical bottlenecks have accelerated coalescence. We use genealogical patterns in mitochondrial DNA and in introns of four nuclear loci to test for historical bottlenecks during the speciation and divergence of two temperate Lagenorhynchus dolphin species isolated by tropical Pacific waters (an antitropical distribution). Despite distinct morphologies, foraging behaviors, and mitochondrial DNAs, these dolphin species are polyphyletic at all four nuclear loci. The abundance of shared polymorphisms between these sister taxa is most consistent with the maintenance of large effective population sizes (5.09 ϫ 10 4 to 10.9 ϫ 10 4 ) during 0.74-1.05 million years of divergence. A variety of population size histories are possible, however. We used gene tree coalescent probabilities to explore the rejection region for historical bottlenecks of different intensity given best estimates of effective population size under a strict isolation model of divergence. In L. obliquidens the data are incompatible with a colonization propagule of an effective size of 10 or fewer individuals. Although the ability to reject less extreme historical bottlenecks will require data from additional loci, the intermixed genealogical patterns observed between these dolphin sister species are highly probable only under an extended history of large population size. If similar demographic histories are inferred for other marine antitropical taxa, a parsimonious model for the Pleistocene origin of these distributions would not involve rare breaches of a constant dispersal barrier by small colonization propagules. Instead, a history of large population size in L. obliquidens and L. obscurus contributes to growing biological and environmental evidence that the equatorial barrier became permeable during glacial/interglacial cycles, leading to vicariant isolation of antitropical populations.

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PHYLOGENETIC RELATIONSHIPS AMONG THE DELPHINID CETACEANS BASED ON FULL CYTOCHROME B SEQUENCES

Cited by 280 publications

References 50 publications

Morfologia do sincrânio do boto-cinza, Sotalia guianensis (P.J. van Bénéden) (Cetacea, Delphinidae)

Morfologia do sincrânio do boto-cinza, Sotalia guianensis (P.J. van Bénéden) (Cetacea, Delphinidae)

Evolution of river dolphins

Genetic Evidence on the Demography of Speciation in Allopatric Dolphin Species

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