Details

Autor(en) / Beteiligte

• Eronen, Aslak
• Hyvärinen, Pekka
• Janhunen, Matti
• Kekäläinen, Jukka
• Kortet, Raine

Titel

Postrelease exploration and stress tolerance of landlocked and anadromous Atlantic salmon and their hybrids

Ist Teil von

• Conservation science and practice, 2023-03, Vol.5 (3), p.n/a

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Threatened fish populations worldwide are relying on stock supplementation by hatchery‐reared fish. Although stocking with non‐native fish may lead to hybridization, thereby disrupting local adaptations, it could also improve the adaptive potential of small populations by increasing variability in essential behavioral traits. In this study, we crossbred the critically endangered Finnish landlocked salmon with a geographically close Baltic anadromous salmon population to compare boldness‐related behavioral traits among the crossing groups. We studied postrelease exploration in seminatural streams and tested stress tolerance of the fish, as reflected by their response during swimming trials and commencement of feeding after the trials. In the stress tolerance experiments, we compared fish with different rearing backgrounds to gain insight into environmentally induced variability in stress tolerance. When compared with the anadromous salmon, the landlocked salmon showed more active postrelease exploration and higher stress tolerance. The hybrids displayed intermediate behaviors compared with the purebred salmon, indicating heritability of these traits. The landlocked salmon showed less variable exploration than the hybrids with anadromous salmon as the maternal strain, but we did not find rearing‐dependent responses in stress tolerance. In summary, our findings suggest that hybridization could help in reversing likely domestication‐related negative behavioral traits in the landlocked salmon. We studied the behavioral consequences of applying genetic rescue on the landlocked salmon of Lake Saimaa, Finland. We found that the landlocked salmon showed increased explorative tendency as well as reduced stress responsiveness in relation to the anadromous salmon with which it was hybridized. Thus, our study highlights that hybridization could reduce explorative tendency, augment stress responsiveness and possibly increase behavioral variability in the landlocked salmon.