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n2:228405

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bibo:Document schema:CreativeWork

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Uthicke <i>et al.</i> (2004)

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schema:datePublished

2004-01-01

dct:title

Uthicke <i>et al.</i> (2004)

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n7:MF04226

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_:vb70015492

dct:abstract

Using mtDNA sequences we found that the Indo-Pacific teatfish fishery comprises at least three species,clarifying confusion on the taxonomic status of these commercially important holothurians. Traditional taxonomiccharacters, including the morphology of skeletal structures, could not be used to differentiate the species. Sequencesof the COI gene (529 bp) distinguished three haplotype clusters, corresponding to distinct colour forms and, to someextent, previously described species. The white teatfish, Holothuria fuscogilva, comprises a range of colour morphsand has a wide distribution over the tropical Indo-Pacific region. The large sequence divergence indicates potentialfor the presence of several cryptic species in thewhite teatfish complex. In contrast to current taxonomy,we identifiedtwo species of black teatfish that appear to be allopatric: H. whitmaei is entirely black and has a Pacific distribution;whereas H. nobilis has white ventro-lateral dots and only occurs in the Indian Ocean. There is evidence for allopatricspeciation between the black teatfish species, possibly driven by separation of the oceans and altered current patternsduring the Pliocene, resulting in relatively young species with low intraspecific sequence divergence. These resultsprovide insight into speciation in these tropical holothurians and are crucial for their conservation management.

bibo:abstract

Using mtDNA sequences we found that the Indo-Pacific teatfish fishery comprises at least three species,clarifying confusion on the taxonomic status of these commercially important holothurians. Traditional taxonomiccharacters, including the morphology of skeletal structures, could not be used to differentiate the species. Sequencesof the COI gene (529 bp) distinguished three haplotype clusters, corresponding to distinct colour forms and, to someextent, previously described species. The white teatfish, Holothuria fuscogilva, comprises a range of colour morphsand has a wide distribution over the tropical Indo-Pacific region. The large sequence divergence indicates potentialfor the presence of several cryptic species in thewhite teatfish complex. In contrast to current taxonomy,we identifiedtwo species of black teatfish that appear to be allopatric: H. whitmaei is entirely black and has a Pacific distribution;whereas H. nobilis has white ventro-lateral dots and only occurs in the Indian Ocean. There is evidence for allopatricspeciation between the black teatfish species, possibly driven by separation of the oceans and altered current patternsduring the Pliocene, resulting in relatively young species with low intraspecific sequence divergence. These resultsprovide insight into speciation in these tropical holothurians and are crucial for their conservation management.

dct:issued

2004-01-01

dct:bibliographicCitation

Uthicke, S., O'Hara, T. D. &amp; Byrne, M. 2004. Species composition and molecular phylogeny of the Indo-Pacific teatfish (Echinodermata: Holothuroidea) bêche-de-mer fishery. <em>Marine and Freshwater Research</em>, <em>55</em>(8), 837-848.

bibo:doi

10.1071/MF04226

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n7:MF04226

Subject Item

_:vb70015492

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schema:PropertyValue

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n10:P356

schema:value

10.1071/MF04226