Potential for between-mudflat movement and metapopulation dynamics in an intertidal burrowing amphipod

We evaluated the potential for between-mudflat dispersal of individuals of the burrow-dwelling amphipodCorophium volutator. We first estimated the distances travelled by measuring vertical distribution of swimmers in the water column and their activity in relation to the tidal cycle. We found amphip...

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Veröffentlicht in:Marine ecology. Progress series (Halstenbek) 2012-03, Vol.449, p.197-209
Hauptverfasser: Drolet, David, Bringloe, Trevor T., Coffin, Michael R. S., Barbeau, Myriam A., Hamilton, Diana J.
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container_title Marine ecology. Progress series (Halstenbek)
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creator Drolet, David
Bringloe, Trevor T.
Coffin, Michael R. S.
Barbeau, Myriam A.
Hamilton, Diana J.
description We evaluated the potential for between-mudflat dispersal of individuals of the burrow-dwelling amphipodCorophium volutator. We first estimated the distances travelled by measuring vertical distribution of swimmers in the water column and their activity in relation to the tidal cycle. We found amphipods were located high over the substratum (up to 4 m) with little vertical structure, and swimming occurred during periods of maximum water velocity (large peak during flood tide). Based on the behaviour of amphipods and information on hydrodynamics, we estimated that an individual could move between 0.4 and 14.4 km toward the upper part of the bay in a single swimming event. This distance is sufficient to allow travel from one mudflat to the next in only a few swimming steps. To identify potential migration routes, we also sampled along a shore (covered in a narrow band of mud) between 2 major mudflats. Patterns in density suggested there was a presence of a travelling wave of individuals, which is consistent with predictions made from their swimming behaviour. We evaluated the possibility thatC. volutatorin the upper Bay of Fundy are found in one or several metapopulations, where the large and discrete mudflats are connected by the dispersal of individuals. We propose a refined, spatially structured population model (modified from terrestrial metapopulation models) applicable to soft sediment environments in marine intertidal zones, in which several groups of a few intertidal flats are connected by the unidirectional movement of the amphipods. The dynamics will largely be determined by the detailed spatial arrangement of intertidal flats and corridors, as well as by the details of the hydrodynamic conditions and behaviour of organisms.
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source Inter-Research; JSTOR Archive Collection A-Z Listing; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Corophium volutator
Floods
Inlets
Marine
Marine ecology
Metapopulation ecology
Mud
Mud flats
Population dynamics
Sediments
Swimming
Water immersion
title Potential for between-mudflat movement and metapopulation dynamics in an intertidal burrowing amphipod
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