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A large wild salmon stock shows genetic and life history differentiation within, but not between, rivers

Miettinen, Antti and Palm, Stefan and Dannewitz, Johan and Lind, Emma and Primmer, Craig R. and Romakkaniemi, Atso and Östergren, Johan and Pritchard, Victoria L. (2021). A large wild salmon stock shows genetic and life history differentiation within, but not between, rivers. Conservation Genetics. 22
[Journal article]

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Abstract

Anadromous salmonid fishes frequently exhibit strong geographic population structuring. However, population genetic differentiation of Atlantic salmon (Salmo salar) at fine geographic scales differs across equivalent spatial extents in different regions. So far, fine-scale genetic differentiation has not been assessed in rivers of the Baltic Sea, a region that contains an evolutionarily distinct Atlantic salmon lineage. Thus, Baltic salmon are currently managed on the river level, without focus on potential genetic structure and diversity within rivers. Here, we used microsatellites to characterize the genetic structure of wild juvenile salmon sampled throughout the interconnected, northern Baltic Tornio and Kalix Rivers. We found genetic differentiation within the two rivers, but not between them: salmon in the upper reaches differed from individuals in the lower reaches, regardless of river system. Further, examining smolts migrating from the river to the sea and adults returning from the sea to spawn, we found an association between the genetic structure and seasonal migration timing. Out-migrating smolts genetically assigned to upper river reaches were older and tended to reach the sea later in the season than smolts from the lower reaches. In contrast, mature adults originating from the upper reaches returned to the river early in the season. Our observation of genetic population structuring between downstream and upstream reaches of the large Tornio and Kalix rivers, and its association with migration timing, implies that careful temporal management of the northern Baltic fisheries would help to preserve the diversity and sustainability of the wild salmon stocks of these rivers.

Authors/Creators:Miettinen, Antti and Palm, Stefan and Dannewitz, Johan and Lind, Emma and Primmer, Craig R. and Romakkaniemi, Atso and Östergren, Johan and Pritchard, Victoria L.
Title:A large wild salmon stock shows genetic and life history differentiation within, but not between, rivers
Series Name/Journal:Conservation Genetics
Year of publishing :2021
Volume:22
Number of Pages:17
Publisher:SPRINGER
ISSN:1566-0621
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:Atlantic salmon, Baltic Sea, Isolation by distance, Mixed stock analysis, Population genetics, Run timing
URN:NBN:urn:nbn:se:slu:epsilon-p-109353
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109353
Additional ID:
Type of IDID
DOI10.1007/s10592-020-01317-y
Web of Science (WoS)000589994900001
ID Code:22696
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Aquatic Resources
Deposited By: SLUpub Connector
Deposited On:04 Mar 2021 10:43
Metadata Last Modified:04 Mar 2021 10:51

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