Cargando…

Differences in brain morphology of brown trout across stream, lake, and hatchery environments

It has been suggested that a trade‐off between cognitive capacity and developmental costs may drive brain size and morphology across fish species, but this pattern is less well explored at the intraspecific level. Physical habitat complexity has been proposed as a key selection pressure on cognitive...

Descripción completa

Detalles Bibliográficos
Autores principales: Závorka, Libor, Koene, J. Peter, Armstrong, Tiffany A., Fehlinger, Lena, Adams, Colin E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8902666/
https://www.ncbi.nlm.nih.gov/pubmed/35309753
http://dx.doi.org/10.1002/ece3.8684
_version_ 1784664638430904320
author Závorka, Libor
Koene, J. Peter
Armstrong, Tiffany A.
Fehlinger, Lena
Adams, Colin E.
author_facet Závorka, Libor
Koene, J. Peter
Armstrong, Tiffany A.
Fehlinger, Lena
Adams, Colin E.
author_sort Závorka, Libor
collection PubMed
description It has been suggested that a trade‐off between cognitive capacity and developmental costs may drive brain size and morphology across fish species, but this pattern is less well explored at the intraspecific level. Physical habitat complexity has been proposed as a key selection pressure on cognitive capacity that shapes brain morphology of fishes. In this study, we compared brain morphology of brown trout, Salmo trutta, from stream, lake, and hatchery environments, which generally differ in physical complexity ranging from low habitat complexity in the hatchery to high habitat complexity in streams and intermediate complexity in lakes. We found that brain size, and the size of optic tectum and telencephalon differed across the three habitats, both being largest in lake fish with a tendency to be smaller in the stream compared to hatchery fish. Therefore, our findings do not support the hypothesis that in brown trout the volume of brain and its regions important for navigation and decision‐making increases in physically complex habitats. We suggest that the observed differences in brain size might be associated with diet quality and habitat‐specific behavioral adaptations rather than physical habitat complexity.
format Online
Article
Text
id pubmed-8902666
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-89026662022-03-17 Differences in brain morphology of brown trout across stream, lake, and hatchery environments Závorka, Libor Koene, J. Peter Armstrong, Tiffany A. Fehlinger, Lena Adams, Colin E. Ecol Evol Nature Notes It has been suggested that a trade‐off between cognitive capacity and developmental costs may drive brain size and morphology across fish species, but this pattern is less well explored at the intraspecific level. Physical habitat complexity has been proposed as a key selection pressure on cognitive capacity that shapes brain morphology of fishes. In this study, we compared brain morphology of brown trout, Salmo trutta, from stream, lake, and hatchery environments, which generally differ in physical complexity ranging from low habitat complexity in the hatchery to high habitat complexity in streams and intermediate complexity in lakes. We found that brain size, and the size of optic tectum and telencephalon differed across the three habitats, both being largest in lake fish with a tendency to be smaller in the stream compared to hatchery fish. Therefore, our findings do not support the hypothesis that in brown trout the volume of brain and its regions important for navigation and decision‐making increases in physically complex habitats. We suggest that the observed differences in brain size might be associated with diet quality and habitat‐specific behavioral adaptations rather than physical habitat complexity. John Wiley and Sons Inc. 2022-03-08 /pmc/articles/PMC8902666/ /pubmed/35309753 http://dx.doi.org/10.1002/ece3.8684 Text en © 2022 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Nature Notes
Závorka, Libor
Koene, J. Peter
Armstrong, Tiffany A.
Fehlinger, Lena
Adams, Colin E.
Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title_full Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title_fullStr Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title_full_unstemmed Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title_short Differences in brain morphology of brown trout across stream, lake, and hatchery environments
title_sort differences in brain morphology of brown trout across stream, lake, and hatchery environments
topic Nature Notes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8902666/
https://www.ncbi.nlm.nih.gov/pubmed/35309753
http://dx.doi.org/10.1002/ece3.8684
work_keys_str_mv AT zavorkalibor differencesinbrainmorphologyofbrowntroutacrossstreamlakeandhatcheryenvironments
AT koenejpeter differencesinbrainmorphologyofbrowntroutacrossstreamlakeandhatcheryenvironments
AT armstrongtiffanya differencesinbrainmorphologyofbrowntroutacrossstreamlakeandhatcheryenvironments
AT fehlingerlena differencesinbrainmorphologyofbrowntroutacrossstreamlakeandhatcheryenvironments
AT adamscoline differencesinbrainmorphologyofbrowntroutacrossstreamlakeandhatcheryenvironments