Journal article Open Access

Connectivity modelling of areas closed to protect vulnerable marine ecosystems in the northwest Atlantic

Kenchington, Ellen; Wang, Zeliang; Lirette, Camille; Murillo, Francisco Javier; Guijarro, Javier; Yashayaev, Igor; Maldonado, Manuel

ABSTRACT

Over the course of the past decade, in response to United Nations General Assembly resolutions calling for the protection of vulnerable marine ecosystems (VMEs), the Northwest Atlantic Fisheries Organization has closed 14 areas around the high-seas portion of Grand Bank and Flemish Cap to protect deep-sea coral and sponge habitats from impacts by bottom-contact fishing gears. Structural and functional connectivity for those areas were not explicitly considered in the area-selection process. We applied a particle-tracking model in each of four seasons to produce dispersal trajectories at the surface and 100 m from start points within the closed areas. These were run in forecast and hindcast modes to identify dispersal kernels. Currents at the surface, 100 m, 1000 m and “on bottom” were examined under an independent model (NEMO) to infer structural connectivity among the areas at relevant depths not available in the particle-tracking model. Spawning times and planktonic larval duration of the dominant sponges, sea pens and gorgonian corals were then considered to evaluate the trajectories as biophysical models, while species distribution models identified potential source populations from hindcast projections. Five of the 14 areas, including the three largest closures, showed particle retention, with three others showing retention within 10 km of their boundaries. The regional pattern of currents and their topographic forcing emerged as a strong structuring agent. A system of weakly-connected closed areas to protect sea pen VMEs on Flemish Cap was identified. The conducted approach illustrates the added value of assessing/modelling networking properties when designing MPAs.

 

HIGHLIGHTS

  • Connectivity models greatly enhance understanding of protected area conservation.
  • Most tracking model scenarios predict larval export from the region.
  • Extreme topographic steering is a major influence on connectivity below 100 m.
  • Bio-physical models predict self-recruitment in or near 8 of 14 closed areas.
  • A weak network identified on Flemish Cap connects areas closed to protect sea pens.

COPYRIGHT © 2018 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/). ACKNOWLEDGEMENTS. We thank T. Kenchington, A. Drozdowski and L. Beazley at the Bedford Institute of Oceanography, and two anonymous reviewers, for their very helpful suggestions for improvement of earlier drafts of this paper. We also thank our colleagues in the NAFO Working Group on Ecosystem Science Assessment (WGESA) for their helpful comments and suggestions. FUNDING. This work was supported by Fisheries and Oceans, Canada's International Governance Strategy, awarded to EK; this work is a Canadian and Spanish CSIC contribution to the SponGES project - part of the European Union's Horizon 2020 research and innovation programme under grant agreement no. 679849. The EU groundfish surveys in the NAFO area were co-funded by the Spanish Institute of Oceanography (IEO), the Portuguese Institute for Sea and Atmosphere (IPMA), the Spanish Institute for Marine Research Superior Council of Scientific Investigations (IIM-CSIC) and the European Union through the European Maritime and Fisheries Fund (EMFF) within the National Program of collection, management and use of data in the fisheries sector and support for scientific advice regarding the Common Fisheries Policy.
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