Long-term interannual variability in larval dispersal and connectivity of the Norway lobster (Nephrops norvegicus) around Ireland: When supply-side matters

Ryan Mc Geady, Colm Lordan, Anne Marie Power

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Abstract

Dispersal of meroplankton larvae in the ocean is a key process which determines larval supply to areas of suitable habitat and enables connectivity between populations, particularly for nonmigratory species. Our objective was to use a biophysical larvaltransport model to create a time series (2000–2019) of larval retention, dispersal distance and connectivity estimates for the commercially important Norway lobster (Nephrops norvegicus) on mud grounds off Ireland. Where time series of population estimates were sufficiently long to conduct analysis, we also investigated if larval dispersal indices could be used to predict variations in adult density, after a lag period,hypothesising that this would only apply to grounds with consistently low larval supply. Grounds off Ireland had varying characteristics related to their ability to retainand exchange larvae which was influenced by the local hydrodynamic regime andspatial isolation from other grounds. Larval supply was consistently low on the Aran grounds to the west of Ireland, which have experienced abundance declines in thepast. The time series of modelled larval dispersal indices at the Aran grounds was linked to empirical adult burrow densities with a 3-year lag. Whereas the western Irish Sea, which has consistently high larval supply, showed no such relationship. Models can provide important larval recruitment information early in the life cycle for species of commercial or conservation importance.
Original languageEnglish
Pages (from-to)255-270
Number of pages16
JournalFisheries Oceanography
Volume31
Issue number3
DOIs
Publication statusPublished - 17 Feb 2022

Bibliographical note

Funding Information:
This project (grant‐aid agreement no. CF/16/04) was carried out with the support of the Marine Institute and funded under the Marine Research Sub‐Programme by the Irish Government. We thank Anthony Irwin and the crew of the RV , the captain and crew of the RV , Rosemarie Butler, Eoin MacLoughlin, Maeve Edwards, Dariusz Nowak, Bartley Hernon, Damien Glynn, Kieran Adlum, Siubhán Curran, Turloch Smith and Ian Murphy for assistance during light trap sampling. We are also grateful to Jennifer Doyle and Mat Lundy for making UWTV data available. Dulra na Mara Celtic Voyager

Publisher Copyright:
© 2022 The Authors. Fisheries Oceanography published by John Wiley & Sons Ltd.

Keywords

  • connectivity
  • dispersal
  • Nephrops norvegicus
  • Norway lobster
  • recruitment
  • supply-side ecology
  • larvae

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