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Hessler and Jumars (1974) revisited: abyssal polychaete assemblages from the Atlantic and Pacific

Identifieur interne : 00C916 ( Main/Exploration ); précédent : 00C915; suivant : 00C917

Hessler and Jumars (1974) revisited: abyssal polychaete assemblages from the Atlantic and Pacific

Auteurs : Gordon L. J. Paterson [Royaume-Uni] ; George D. F. Wilson [Australie] ; Nathalie Cosson [France] ; Peter A. Lamont [Royaume-Uni]

Source :

RBID : ISTEX:49CB36EFA6341B77142CEC2F73341F675B5AE1AB

Descripteurs français

English descriptors

Abstract

Abstract: Abyssal polychaete assemblages from three sites in the NE Atlantic were compared with three from the equatorial Pacific. Both sets of sites lie along perceived productivity gradients. Abundance of polychaetes was related to measures and proxies of nutrients reaching the deep-sea floor, while diversity was not consistent. Similarly, trophic groups did not show any major changes in abundance or diversity which could have been associated with changing nutrient input. Analysis of sample species richness (α diversity) indicated high species richness on a par, at similar densities, with deep-sea sites from slope regions; the main difference being that shallower sites have higher densities and thus more species overall per sample. However, our analysis indicates that an extreme number of replicates would be needed to sample adequately all the species at a site because of high species richness, intersample variability, and low densities. Comparison between sites (β diversity) is difficult because of the need for large numbers of replicates, but preliminary results suggest that both Atlantic and Pacific assemblage composition changed over a scale of 500–1000km. Our results indicate that the abyssal ecosystem is not one uniform habitat but is composed of many distinct regions. Overall, our diversity and trophic structure results agree with findings made by Hessler and Jumars (1974, Deep-Sea Research, 21, 185–209).

Url:
DOI: 10.1016/S0967-0645(97)00084-2


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Le document en format XML

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<term>Echo site</term>
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<term>Lower species richness</term>
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<term>Manganese nodule belt</term>
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<term>Motile group</term>
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<term>Ndings</term>
<term>Ness</term>
<term>Ness analysis</term>
<term>Ness similarity</term>
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<term>Nodule formation</term>
<term>Nutrient</term>
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<term>Polychaete</term>
<term>Polychaete abundance</term>
<term>Polychaete assemblages</term>
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<term>Preliminary results</term>
<term>Preservational reserve area</term>
<term>Primary productivity</term>
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<term>Sampling programme</term>
<term>Scripps institution</term>
<term>Sediment</term>
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<term>Shallower sites</term>
<term>Sibuet</term>
<term>Similar densities</term>
<term>Similarity measure</term>
<term>Species accumulation</term>
<term>Species accumulation curves</term>
<term>Species composition</term>
<term>Species diversity</term>
<term>Species level</term>
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<term>Thurston</term>
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<term>Trophic</term>
<term>Trophic groupings</term>
<term>Trophic groups</term>
<term>Trophic structure</term>
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<term>Verde abyssal</term>
<term>Vertical distribution</term>
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<front>
<div type="abstract" xml:lang="en">Abstract: Abyssal polychaete assemblages from three sites in the NE Atlantic were compared with three from the equatorial Pacific. Both sets of sites lie along perceived productivity gradients. Abundance of polychaetes was related to measures and proxies of nutrients reaching the deep-sea floor, while diversity was not consistent. Similarly, trophic groups did not show any major changes in abundance or diversity which could have been associated with changing nutrient input. Analysis of sample species richness (α diversity) indicated high species richness on a par, at similar densities, with deep-sea sites from slope regions; the main difference being that shallower sites have higher densities and thus more species overall per sample. However, our analysis indicates that an extreme number of replicates would be needed to sample adequately all the species at a site because of high species richness, intersample variability, and low densities. Comparison between sites (β diversity) is difficult because of the need for large numbers of replicates, but preliminary results suggest that both Atlantic and Pacific assemblage composition changed over a scale of 500–1000km. Our results indicate that the abyssal ecosystem is not one uniform habitat but is composed of many distinct regions. Overall, our diversity and trophic structure results agree with findings made by Hessler and Jumars (1974, Deep-Sea Research, 21, 185–209).</div>
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