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Management and conservation of the kelp speciesLaminaria digitata : using genetic tools to explore the potentialexporting role of the MPA “Parc naturel marin d’Iroise

Published online by Cambridge University Press:  24 October 2012

Lucía Couceiro
Affiliation:
UPMC, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France CNRS, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France
Marine Robuchon
Affiliation:
UPMC, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France CNRS, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France MNHN, UMR 7138, Systématique, adaptation, évolution, 57 rue Cuvier, 75231 Paris Cedex 05, France
Christophe Destombe
Affiliation:
UPMC, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France CNRS, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France
Myriam Valero*
Affiliation:
UPMC, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France CNRS, UMR 7144, Adaptation et diversité en milieu marin, Équipe BEDIM, Station Biologique de Roscoff, Place Georges Teissier, 29682 Roscoff, France
*
a Corresponding author:[email protected]
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Abstract

Marine protected areas (MPAs) have been depicted as a useful tool for improving fisherymanagement and protecting biodiversity. For example, by acting as source populations, MPAsmay provide a spillover of adults/propagules, enhancing recruitment to surrounding,non-protected waters. However, such positive effect will depend on how a MPAs designmatches population biology and dispersal abilities of the target species. High levels ofintraspecific genetic diversity without pronounced structure have been found in manymarine organisms over large spatial scales (from hundreds to thousands kilometres) but donot hold for other ecologically and economically important species such as coral reeffishes, seagrasses and kelps. In particular, the limited potential for dispersal of manymacroalgae suggests the occurrence of self-sustaining, “closed” populations that contrastwith the “open” populations of many fishes and invertebrates. Consequently, the highresilience of fish/invertebrate populations cannot be generalized to the whole marinerealm. In the present work, we use genetic tools to explore the role of the MPAParc naturel marin d’Iroise in the management of the emblematic kelpLaminaria digitata. While kelps have received much more scientificattention than any other seaweed group, there is still critical baseline knowledge whichneeds to be addressed for their effective management. Our genetic survey of 12 L.digitata populations along the Brittany coast, four of them located within theboundaries of the Parc naturel marin d’Iroise, allowed us to assess theconservation value of these kelp populations. In particular, classical genetic metrics aswell as more recent clustering approaches were used to identify and characterizeManagement Units. Moreover, assignment tests were employed to determine contemporarymigration events and source/sink populations. Our results show that populations withinthis MPA have high conservation value. However, we also identify other populations ofconservation interest.

Type
Research Article
Copyright
© EDP Sciences, IFREMER, IRD 2012

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