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The composition and relationships of the marine molluscan fauna of the Pitcairn Islands

Identifieur interne : 000B29 ( Istex/Curation ); précédent : 000B28; suivant : 000B30

The composition and relationships of the marine molluscan fauna of the Pitcairn Islands

Auteurs : R. C. Preece

Source :

RBID : ISTEX:16BAE82D799D0B857F6EF42FD94BAD9CBCAF7F4C

Descripteurs français

English descriptors

Abstract

The recent expedition has doubled the number of marine molluscs known from the Pitcairn Islands. Over 80 taxa are recorded from Ducie and Pitcairn (both still poorly known), 240 from Oeno and 320 from Henderson. A total exceeding 400 taxa is now known from the group as a whole. Most of this increase results from a vastly improved knowledge of the small taxa that had been neglected in earlier surveys. Important faunal differences exist between the four islands in the group which are related to the different character of each island. These totals still underestimate the true diversities, but they provide data that are comparable in quality to those from adjacent regions. In this context the molluscan fauna from the Pitcairn Islands is seen to be impoverished when compared to those from islands further west. Most of the fauna is composed of widespread Indo‐West Pacific species, but there are several taxa that have more restricted ranges centred on S.E. Polynesia. A few, including some undescribed taxa discovered on the expedition, appear to be endemic. Significantly, many of these are characterized by non‐planktotrophic larval development. Comparison of the modern fauna from Henderson with the fossil fauna from the Pleistocene reef on its plateau reveals important differences. About 25% of the fossil molluscs are currently unknown from the group and about 5% appear to be undescribed. These high rates of turnover demonstrate that the faunas are temporally unstable.

Url:
DOI: 10.1111/j.1095-8312.1995.tb01095.x

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ISTEX:16BAE82D799D0B857F6EF42FD94BAD9CBCAF7F4C

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R. C. Preece
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<mods:affiliation>Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ</mods:affiliation>
<wicri:noCountry code="subField">3EJ</wicri:noCountry>
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Le document en format XML

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<term>Roding</term>
<term>Sachet stoddart</term>
<term>Sediment samples</term>
<term>Several species</term>
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<term>Sleurs preece</term>
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<term>Societatis thiele</term>
<term>Southeastern polynesia</term>
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<term>Bishop museum</term>
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<term>Bivalve ratios</term>
<term>Bivalve species</term>
<term>Brief description</term>
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<term>Broderip sowerby</term>
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<term>Cook islands</term>
<term>Cypraea</term>
<term>Deeper water</term>
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<term>Dioscoroides press</term>
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<term>Drupa speciosa</term>
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<term>French polynesia</term>
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<term>Gmelin</term>
<term>Gould</term>
<term>Habitat availability</term>
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<term>Henderson</term>
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<term>Insular marine faunas</term>
<term>Intertidal zone</term>
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<term>Morum ponderosum</term>
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<term>Other groups</term>
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<term>Pea</term>
<term>Personal communication</term>
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<term>Preece</term>
<term>Quoy gaimard</term>
<term>Randall</term>
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<term>Recent expedition</term>
<term>Reeve</term>
<term>Rehder</term>
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<term>Rehder wilson</term>
<term>Relative abundance</term>
<term>Rissoina</term>
<term>Roding</term>
<term>Sachet stoddart</term>
<term>Sediment samples</term>
<term>Several species</term>
<term>Sleurs</term>
<term>Sleurs preece</term>
<term>Small taxa</term>
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<div type="abstract" xml:lang="en">The recent expedition has doubled the number of marine molluscs known from the Pitcairn Islands. Over 80 taxa are recorded from Ducie and Pitcairn (both still poorly known), 240 from Oeno and 320 from Henderson. A total exceeding 400 taxa is now known from the group as a whole. Most of this increase results from a vastly improved knowledge of the small taxa that had been neglected in earlier surveys. Important faunal differences exist between the four islands in the group which are related to the different character of each island. These totals still underestimate the true diversities, but they provide data that are comparable in quality to those from adjacent regions. In this context the molluscan fauna from the Pitcairn Islands is seen to be impoverished when compared to those from islands further west. Most of the fauna is composed of widespread Indo‐West Pacific species, but there are several taxa that have more restricted ranges centred on S.E. Polynesia. A few, including some undescribed taxa discovered on the expedition, appear to be endemic. Significantly, many of these are characterized by non‐planktotrophic larval development. Comparison of the modern fauna from Henderson with the fossil fauna from the Pleistocene reef on its plateau reveals important differences. About 25% of the fossil molluscs are currently unknown from the group and about 5% appear to be undescribed. These high rates of turnover demonstrate that the faunas are temporally unstable.</div>
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