Publication Date:
2022-05-25
Description:
© The Author(s), 2020. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Romagnoni, G., Kvile, K. o., Dagestad, K., Eikeset, A. M., Kristiansen, T., Stenseth, N. C., & Langangen, O. Influence of larval transport and temperature on recruitment dynamics of North Sea cod (Gadus morhua) across spatial scales of observation. Fisheries Oceanography, (2020): 1-16, doi:10.1111/fog.12474.
Description:
The survival of fish eggs and larvae, and therefore recruitment success, can be critically affected by transport in ocean currents. Combining a model of earlyâlife stage dispersal with statistical stockârecruitment models, we investigated the role of larval transport for recruitment variability across spatial scales for the population complex of North Sea cod (Gadus morhua ). By using a coupled physicalâbiological model, we estimated the egg and larval transport over a 44âyear period. The oceanographic component of the model, capable of capturing the interannual variability of temperature and ocean current patterns, was coupled to the biological component, an individualâbased model (IBM) that simulated the cod eggs and larvae development and mortality. This study proposes a novel method to account for larval transport and success in stockârecruitment models: weighting the spawning stock biomass by retention rate and, in the case of multiple populations, their connectivity. Our method provides an estimate of the stock biomass contributing to recruitment and the effect of larval transport on recruitment variability. Our results indicate an effect, albeit small, in some populations at the local level. Including transport anomaly as an environmental covariate in traditional stockârecruitment models in turn captures recruitment variability at larger scales. Our study aims to quantify the role of larval transport for recruitment across spatial scales, and disentangle the roles of temperature and larval transport on effective connectivity between populations, thus informing about the potential impacts of climate change on the cod population structure in the North Sea.
Description:
G.R. was supported by the Norden Topâlevel Research Initiative subâprogramme âEffect Studies and Adaptation to Climate Changeâ through the Nordic Centre for Research on Marine Ecosystems and Resources under Climate Change (NorMER). K.Ă.K. was supported by the WHOI John H. Steele Postâdoctoral Scholar award and VISTA â a basic research program in collaboration between The Norwegian Academy of Science and Letters, and Equinor. We thank an anonymous referee for valuable comments that substantially improved the article.
Keywords:
Atlantic cod
;
biophysical model
;
larval transport
;
North Sea
;
populations
;
stockârecruitment
;
temperature
Repository Name:
Woods Hole Open Access Server
Type:
Article
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