Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar
Many Atlantic salmon Salmo salar populations in Europe are threatened by previous stocking with foreign hatchery strains. Temporal patterns of genetic characteristics of salmon from northern Spain, the southernmost European populations, were compared before and after species decline and heavy stocki...
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ftdoajarticles:oai:doaj.org/article:0489fb163db54696bf42208fb8fb9741 2023-05-15T15:31:54+02:00 Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar Almodóvar, A Leal, S Nicola, GG Hórreo, JL García-Vázquez, E Elvira, B 2020-03-01T00:00:00Z https://doi.org/10.3354/esr01029 https://doaj.org/article/0489fb163db54696bf42208fb8fb9741 EN eng Inter-Research https://www.int-res.com/abstracts/esr/v41/p303-317/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01029 https://doaj.org/article/0489fb163db54696bf42208fb8fb9741 Endangered Species Research, Vol 41, Pp 303-317 (2020) Zoology QL1-991 Botany QK1-989 article 2020 ftdoajarticles https://doi.org/10.3354/esr01029 2022-12-31T01:58:14Z Many Atlantic salmon Salmo salar populations in Europe are threatened by previous stocking with foreign hatchery strains. Temporal patterns of genetic characteristics of salmon from northern Spain, the southernmost European populations, were compared before and after species decline and heavy stocking with specimens from northern Europe. Eleven microsatellite loci were analysed in archival (scales from 1958-1960) and contemporary (2007-2008) samples from the River Sella. Temporal analyses revealed a similar heterozygosity between archival and contemporary samples, despite a drastic decrease in population abundance, while the contemporary sample showed a higher allelic richness due to the occurrence of foreign alleles. Considering only the alleles with at least 4% frequency in the archival sample, 2 alleles exclusive to the River Sella were absent in the contemporary sample, and 14 alleles showed a decrease of at least 4% frequency. Four alleles common in Scotland showed a high occurrence in the contemporary sample, so they are good candidates as markers of introgression of foreign genes. The heavy stocking with non-native Scottish broodstocks between 1970 and 1990 caused the introgression found in the contemporary sample when compared with the pristine population. An abrupt decrease was evident when the estimates of effective number of breeders were adjusted to take into account overlapping generations (NbAdj), effective population size (NeAdj) estimated from NbAdj, and number of breeders estimated using the sibship assignment method (NbSIB). The very low effective size values found in the contemporary sample, together with the detrimental synergy between genetic drift and high rates of introgression, represent a severe risk for the conservation of native salmon. Article in Journal/Newspaper Atlantic salmon Salmo salar Directory of Open Access Journals: DOAJ Articles Endangered Species Research 41 303 317 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Zoology QL1-991 Botany QK1-989 |
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Zoology QL1-991 Botany QK1-989 Almodóvar, A Leal, S Nicola, GG Hórreo, JL García-Vázquez, E Elvira, B Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
topic_facet |
Zoology QL1-991 Botany QK1-989 |
description |
Many Atlantic salmon Salmo salar populations in Europe are threatened by previous stocking with foreign hatchery strains. Temporal patterns of genetic characteristics of salmon from northern Spain, the southernmost European populations, were compared before and after species decline and heavy stocking with specimens from northern Europe. Eleven microsatellite loci were analysed in archival (scales from 1958-1960) and contemporary (2007-2008) samples from the River Sella. Temporal analyses revealed a similar heterozygosity between archival and contemporary samples, despite a drastic decrease in population abundance, while the contemporary sample showed a higher allelic richness due to the occurrence of foreign alleles. Considering only the alleles with at least 4% frequency in the archival sample, 2 alleles exclusive to the River Sella were absent in the contemporary sample, and 14 alleles showed a decrease of at least 4% frequency. Four alleles common in Scotland showed a high occurrence in the contemporary sample, so they are good candidates as markers of introgression of foreign genes. The heavy stocking with non-native Scottish broodstocks between 1970 and 1990 caused the introgression found in the contemporary sample when compared with the pristine population. An abrupt decrease was evident when the estimates of effective number of breeders were adjusted to take into account overlapping generations (NbAdj), effective population size (NeAdj) estimated from NbAdj, and number of breeders estimated using the sibship assignment method (NbSIB). The very low effective size values found in the contemporary sample, together with the detrimental synergy between genetic drift and high rates of introgression, represent a severe risk for the conservation of native salmon. |
format |
Article in Journal/Newspaper |
author |
Almodóvar, A Leal, S Nicola, GG Hórreo, JL García-Vázquez, E Elvira, B |
author_facet |
Almodóvar, A Leal, S Nicola, GG Hórreo, JL García-Vázquez, E Elvira, B |
author_sort |
Almodóvar, A |
title |
Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
title_short |
Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
title_full |
Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
title_fullStr |
Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
title_full_unstemmed |
Long-term stocking practices threaten the original genetic diversity of the southernmost European populations of Atlantic salmon Salmo salar |
title_sort |
long-term stocking practices threaten the original genetic diversity of the southernmost european populations of atlantic salmon salmo salar |
publisher |
Inter-Research |
publishDate |
2020 |
url |
https://doi.org/10.3354/esr01029 https://doaj.org/article/0489fb163db54696bf42208fb8fb9741 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Endangered Species Research, Vol 41, Pp 303-317 (2020) |
op_relation |
https://www.int-res.com/abstracts/esr/v41/p303-317/ https://doaj.org/toc/1863-5407 https://doaj.org/toc/1613-4796 1863-5407 1613-4796 doi:10.3354/esr01029 https://doaj.org/article/0489fb163db54696bf42208fb8fb9741 |
op_doi |
https://doi.org/10.3354/esr01029 |
container_title |
Endangered Species Research |
container_volume |
41 |
container_start_page |
303 |
op_container_end_page |
317 |
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1766362406281281536 |