Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 79, Issue 9, Pages 2442-2452Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsac182
Keywords
age class structure; Faroe Islands; migration; phenotypic diversity; Salmo salar; spatial variation in resource use
Categories
Funding
- Academy of Finland [1328860, 1325964]
- Norwegian Research Council [275862, 280308]
- Ella and Georg Ehrnrooth Postdoctoral Researcher Grant
Ask authors/readers for more resources
The oceans around the Faroe Islands serve as a feeding ground for Atlantic salmon. The utilization of this resource varies among different age classes and populations, with multi-sea winter salmon being more likely to migrate to the Faroes.
While it is known that the oceans around the Faroe Islands support an Atlantic salmon (Salmo salar) feeding ground, the relative use of this resource by different age classes and populations remains largely unexplored. Using genetic stock identification and run-reconstruction modelling, we observed a consistent pattern whereby the proportion of multi-sea winter salmon (MSW-fish that have spent multiple winters at sea) for a reporting group was substantially greater around the Faroes than the MSW proportion among that group's corresponding pre-fisheries abundance. Surprisingly, MSW fish from Ireland and the United Kingdom were as likely to occur around the Faroes as were MSW fish from more north-eastern regions. While 1SW salmon (single sea-winter fish) from Ireland and the United Kingdom as well as Southern Norway occurred in similar proportions around the Faroes, 1SW fish from the north-eastern regions were virtually absent. Our results indicate that the oceans around the Faroes host a predominantly MSW feeding ground and use of this resource varies across age classes and reporting groups. Furthermore, these results suggest that MSW fish from some reporting groups preferentially migrate to the Faroes. Variation in spatial resource use may help buffer salmon populations against localized negative changes in marine conditions via portfolio effects.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available