Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population

Abstract Maintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (Salmo trutta) samples to study fine-scale and short-t...

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Autores principales:	Cornelya F. C. Klütsch, Simo N. Maduna, Natalia Polikarpova, Kristin Forfang, Benedicte Beddari, Karl Øystein Gjelland, Paul Eric Aspholm, Per-Arne Amundsen, Snorre B. Hagen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2b7aada291524597aa34b76302d419de
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spelling	oai:doaj.org-article:2b7aada291524597aa34b76302d419de2021-12-02T16:38:24ZTemporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population10.1038/s41598-021-96681-12045-2322https://doaj.org/article/2b7aada291524597aa34b76302d419de2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96681-1https://doaj.org/toc/2045-2322Abstract Maintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (Salmo trutta) samples to study fine-scale and short-term impacts of different management practices. These had changed from traditional breeding practices, using the same broodstock for several years, to modern breeding practices, including annual broodstock replacement, in the transnational subarctic Pasvik River. Using population genetic structure analyses (i.e., Bayesian assignment tests, DAPCs, and PCAs), four historical genetic clusters (E2001A-D), likely representing family lineages resulting from different crosses, were found in zone E. These groups were characterized by consistently lower genetic diversity, higher within-group relatedness, lower effective population size, and significantly smaller body size than contemporary stocked (E2001E) and wild fish (E2001F). However, even current breeding practices are insufficient to prevent genetic diversity loss and morphological changes as demonstrated by on average smaller body sizes and recent genetic bottleneck signatures in the modern breeding stock compared to wild fish. Conservation management must evaluate breeding protocols for stocking programs and assess if these can preserve remaining natural genetic diversity and morphology in brown trout for long-term preservation of freshwater fauna.Cornelya F. C. KlütschSimo N. MadunaNatalia PolikarpovaKristin ForfangBenedicte BeddariKarl Øystein GjellandPaul Eric AspholmPer-Arne AmundsenSnorre B. HagenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cornelya F. C. Klütsch Simo N. Maduna Natalia Polikarpova Kristin Forfang Benedicte Beddari Karl Øystein Gjelland Paul Eric Aspholm Per-Arne Amundsen Snorre B. Hagen Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
description	Abstract Maintaining standing genetic variation is a challenge in human-dominated landscapes. We used genetic (i.e., 16 short tandem repeats) and morphological (i.e., length and weight) measurements of 593 contemporary and historical brown trout (Salmo trutta) samples to study fine-scale and short-term impacts of different management practices. These had changed from traditional breeding practices, using the same broodstock for several years, to modern breeding practices, including annual broodstock replacement, in the transnational subarctic Pasvik River. Using population genetic structure analyses (i.e., Bayesian assignment tests, DAPCs, and PCAs), four historical genetic clusters (E2001A-D), likely representing family lineages resulting from different crosses, were found in zone E. These groups were characterized by consistently lower genetic diversity, higher within-group relatedness, lower effective population size, and significantly smaller body size than contemporary stocked (E2001E) and wild fish (E2001F). However, even current breeding practices are insufficient to prevent genetic diversity loss and morphological changes as demonstrated by on average smaller body sizes and recent genetic bottleneck signatures in the modern breeding stock compared to wild fish. Conservation management must evaluate breeding protocols for stocking programs and assess if these can preserve remaining natural genetic diversity and morphology in brown trout for long-term preservation of freshwater fauna.
format	article
author	Cornelya F. C. Klütsch Simo N. Maduna Natalia Polikarpova Kristin Forfang Benedicte Beddari Karl Øystein Gjelland Paul Eric Aspholm Per-Arne Amundsen Snorre B. Hagen
author_facet	Cornelya F. C. Klütsch Simo N. Maduna Natalia Polikarpova Kristin Forfang Benedicte Beddari Karl Øystein Gjelland Paul Eric Aspholm Per-Arne Amundsen Snorre B. Hagen
author_sort	Cornelya F. C. Klütsch
title	Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
title_short	Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
title_full	Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
title_fullStr	Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
title_full_unstemmed	Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
title_sort	temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/2b7aada291524597aa34b76302d419de
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Temporal analysis shows relaxed genetic erosion following improved stocking practices in a subarctic transnational brown trout population

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