Agent-based modeling and genetics reveal the Limfjorden, Denmark, as a well-connected system for mussel larvae

Ane Pastor*, Janus Larsen, Flemming Thorbjørn Hansen, Alexis Simon, Nicolas Bierne, Marie Maar

*Corresponding author for this work

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Abstract

Fishery of blue mussels Mytilus edulis constitutes a very important economic activity in Denmark, whereas mussel farming on long-lines or nets is a new, growing sector. Spawning from natural mussel beds takes place during early summer, and larvae disperse via water currents before settling on the bottom or on spat collectors in the farms. In the present study, we coupled a 3D physical model system (FlexSem) with an agent-based model in order to examine the connectivity of this marine system in terms of mussel larval dispersal and settling potential. To address this question, we (1) estimated the dispersal and connectivity between 17 areas in the Limfjorden, (2) identified the main donor and receiver areas of mussel larvae and (3) identified possible dispersal barriers. The results show that the central narrow strait in the Limfjorden was the main donor area in all the studied years, and that the adjacent eastern areas were the main receiver areas. Towards the inner basins of the Limfjorden, isolation increased and limited connectivity was observed. The results from the cluster analysis grouped the Limfjorden into 3 to 5 clusters, but there was still some exchange of simulated larvae observed among these clusters. Analysis of molecular markers revealed no genetic differentiation between areas and supports the model results, indicating that despite distinguishable hydrographic boundaries, the mussel populations in the Limfjorden are well connected. This study demonstrates how connectivity modeling can be used to support site selection processes in aquaculture.
Original languageEnglish
JournalMarine Ecology - Progress Series
Volume680
Pages (from-to)193-205
Number of pages13
ISSN0171-8630
DOIs
Publication statusPublished - 2021

Keywords

  • Larval dispersal
  • Connectivity
  • Agent-based modeling
  • Mussel farms
  • Mytilus edulis
  • Limfjorden

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