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Free Content Effects of Individual Behaviors, Inter-Individual Interactions with Adult Pectinaria Koreni and Owenia Fusiformis (Annelida, Polychaeta), and Hydrodynamism on Pectinaria Koreni Recruitment

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The English Channel is a megatidal sea characterized by large tidal currents in which the larvae of Pectinaria koreni are dispersed on a large spatial scale by tidal currents. They settle abundantly on a wide edaphic spectrum, but the populations of adults are confined to bays and estuaries. Laboratory experiments under still water and flume flows showed that post-larvae of P. koreni were able to actively select a suitable substrate i) on a macrospatial scale by resuspending themselves in the water column; ii) on a microspatial scale by crawling at the sediment surface. Adults also influenced the post-larvae habitat selection. When post-larvae settle on a suitable sediment in presence of adults, they resuspend themselves immediately. This resuspension phenomenon is a consequence of bioturbation by the adults (subsurface deposit feeders) whose vertical movement and feeding activity are mainly dependent on hydrodynamic conditions. However, in the presence of Owenia fusiformis adults (deposit/filter feeders), resuspension rates were weak. This recruitment facilitation might be interpreted as a limitation of post-larval resuspension abilities, tubes in a gregarious distribution stabilizing the sediment and resembling particle traps. The feeding behavior of O. fusiformis, which exhibited high plasticity in relation to hydrodynamism, also influenced the post-larvae response.

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Document Type: Research Article

Publication date: 1997-03-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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