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