Interactions between aggregations and environmental factors explain spatio-temporal patterns of the brittle-star Ophiothrix fragilis in the eastern Bay of Seine
Identifieur interne : 000478 ( France/Analysis ); précédent : 000477; suivant : 000479Interactions between aggregations and environmental factors explain spatio-temporal patterns of the brittle-star Ophiothrix fragilis in the eastern Bay of Seine
Auteurs : Jean-Claude Dauvin [France] ; Yann Mear [France] ; Anne Murat [France] ; Emmanuel Poizot [France] ; Sophie Lozach [France] ; Khadija Beryouni [France]Source :
- Estuarine, coastal and shelf science : (Print) [ 0272-7714 ] ; 2013.
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Abstract
There is a paucity of studies showing long-term changes in the population dynamics of dominant benthic epifaunal species, especially echinoderms, in relation to biological and environmental factors. In the English Channel, the brittle-star Ophiothrix fragilis is a common epifaunal species, mainly found in strong tidal currents characterised by benthic habitats with pebbles. However, in the Bay of Seine, O. fragilis lives on gravel and coarse sandy sediments; more locally, it occurs where there are unexpected amounts of fine particles for such high hydrodynamic areas. This species forms dense aggregations, supporting large populations up to 7450 ind m-2. This paper analyses the long-term spatio-temporal changes of O. fragilis aggregations over the last 25 years in the eastern part of the Bay of Seine through observations obtained from several scientific programmes from 1986 to 2010. This area is characterised as a tidal environment affected by the Seine estuary and is subject to potential sediment supply from the dumping site of the Le Havre harbour dredging operations. During all surveys, there was a similar pattern: persistent patches with high abundances of O. fragilis and sites without O. fragilis, showing that there was a high heterogeneity of the spatial population pattern. Interactions between environmental conditions and ophiurid aggregations (e.g., storm waves, Seine floods and patches) are suggested to explain these patterns.
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changes</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">There is a paucity of studies showing long-term changes in the population dynamics of dominant benthic epifaunal species, especially echinoderms, in relation to biological and environmental factors. In the English Channel, the brittle-star Ophiothrix fragilis is a common epifaunal species, mainly found in strong tidal currents characterised by benthic habitats with pebbles. However, in the Bay of Seine, O. fragilis lives on gravel and coarse sandy sediments; more locally, it occurs where there are unexpected amounts of fine particles for such high hydrodynamic areas. This species forms dense aggregations, supporting large populations up to 7450 ind m<sup>-2</sup>. This paper analyses the long-term spatio-temporal changes of O. fragilis aggregations over the last 25 years in the eastern part of the Bay of Seine through observations obtained from several scientific programmes from 1986 to 2010. This area is characterised as a tidal environment affected by the Seine estuary and is subject to potential sediment supply from the dumping site of the Le Havre harbour dredging operations. During all surveys, there was a similar pattern: persistent patches with high abundances of O. fragilis and sites without O. fragilis, showing that there was a high heterogeneity of the spatial population pattern. Interactions between environmental conditions and ophiurid aggregations (e.g., storm waves, Seine floods and patches) are suggested to explain these patterns.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Basse-Normandie</li><li>Région Normandie</li></region><settlement><li>Caen</li><li>Cherbourg</li></settlement><orgName><li>Université de Caen Basse-Normandie</li></orgName></list><tree><country name="France"><noRegion><name sortKey="Dauvin, Jean Claude" sort="Dauvin, Jean Claude" uniqKey="Dauvin J" first="Jean-Claude" last="Dauvin">Jean-Claude Dauvin</name></noRegion><name sortKey="Beryouni, Khadija" sort="Beryouni, Khadija" uniqKey="Beryouni K" first="Khadija" last="Beryouni">Khadija Beryouni</name><name sortKey="Dauvin, Jean Claude" sort="Dauvin, Jean Claude" uniqKey="Dauvin J" first="Jean-Claude" last="Dauvin">Jean-Claude Dauvin</name><name sortKey="Dauvin, Jean Claude" sort="Dauvin, Jean Claude" uniqKey="Dauvin J" first="Jean-Claude" last="Dauvin">Jean-Claude Dauvin</name><name sortKey="Lozach, Sophie" sort="Lozach, Sophie" uniqKey="Lozach S" first="Sophie" last="Lozach">Sophie Lozach</name><name sortKey="Lozach, Sophie" sort="Lozach, Sophie" uniqKey="Lozach S" first="Sophie" last="Lozach">Sophie Lozach</name><name sortKey="Lozach, Sophie" sort="Lozach, Sophie" uniqKey="Lozach S" first="Sophie" last="Lozach">Sophie Lozach</name><name sortKey="Mear, Yann" sort="Mear, Yann" uniqKey="Mear Y" first="Yann" last="Mear">Yann Mear</name><name sortKey="Murat, Anne" sort="Murat, Anne" uniqKey="Murat A" first="Anne" last="Murat">Anne Murat</name><name sortKey="Poizot, Emmanuel" sort="Poizot, Emmanuel" uniqKey="Poizot E" first="Emmanuel" last="Poizot">Emmanuel Poizot</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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