Journal article 711 views 113 downloads
The early marine distribution of Atlantic salmon in the North‐east Atlantic: A genetically informed stock‐specific synthesis
Fish and Fisheries, Volume: 22, Issue: 6, Pages: 1274 - 1306
Swansea University Author: Carlos Garcia De Leaniz
-
PDF | Version of Record
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Download (5.31MB)
DOI (Published version): 10.1111/faf.12587
Abstract
The survival of Atlantic salmon (Salmo salar), an increasingly rare anadromous species, has declined dramatically during its marine phase, with disproportionate impacts on the poorly understood early post-smolt period. Logistical constraints on collecting oceanic data to inform this issue pose a for...
Published in: | Fish and Fisheries |
---|---|
ISSN: | 1467-2960 1467-2979 |
Published: |
Wiley
2021
|
Online Access: |
Check full text
|
URI: | https://cronfa.swan.ac.uk/Record/cronfa58745 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Abstract: |
The survival of Atlantic salmon (Salmo salar), an increasingly rare anadromous species, has declined dramatically during its marine phase, with disproportionate impacts on the poorly understood early post-smolt period. Logistical constraints on collecting oceanic data to inform this issue pose a formidable obstacle. To advance understanding of post-smolt distributional ecology in the North-east Atlantic, a comprehensive analysis of existing information was undertaken. Data were synthesized from 385 marine cruises, 10,202 individual trawls, and 9,269 captured post-smolts, spanning three decades and ~4.75 million km2 of ocean, with 3,423 individuals genetically assigned to regional phylogeographic origin. The findings confirm major migrational post-smolt aggregations on the continental shelf-edge off Ireland, Scotland and Norway, and an important marine foraging area in the Norwegian Sea. Genetic analysis shows that aggregational stock composition does not simply reflect distance to natal rivers, with northern phylogeographic stock groups significantly under-represented in sampled high-seas aggregations. It identifies a key foraging habitat for southern European post-smolts located in international waters immediately west of the Vøring Plateau escarpment, potentially exposing them to a high by-catch mortality from extra-territorial pelagic fisheries. Evidence of the differential distribution of regional stocks points to fundamental differences in their migration behaviours and may lead to inter-stock variation in responses to environmental change and marine survival. The study shows that understanding of post-smolt marine ecology, as regards to stock-specific variations in habitat utilization, biological performance and exposure to mortality factors, can be significantly advanced by data integration across studies and exploiting genetic approaches. |
---|---|
Keywords: |
genetic stock identification; marine distribution; migration behaviour; pelagic trawls; post-smolts; Salmo salar |
College: |
Faculty of Science and Engineering |
Funders: |
Norges Forskningsråd. Grant Number: 280308; Seventh Framework Programme. Grant Number: 212529 |
Issue: |
6 |
Start Page: |
1274 |
End Page: |
1306 |