Cargando…

Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences

Dams designed for hydropower and other purposes alter the environments of many economically important fishes, including Chinook salmon (Oncorhynchus tshawytscha). We estimated that dams on the Rogue River, the Willamette River, the Cowlitz River, and Fall Creek decreased water temperatures during su...

Descripción completa

Detalles Bibliográficos
Autores principales: Angilletta, Michael J, Ashley Steel, E, Bartz, Krista K, Kingsolver, Joel G, Scheuerell, Mark D, Beckman, Brian R, Crozier, Lisa G
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Blackwell Publishing Ltd 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352442/
https://www.ncbi.nlm.nih.gov/pubmed/25567632
http://dx.doi.org/10.1111/j.1752-4571.2008.00032.x
_version_ 1782232908751175680
author Angilletta, Michael J
Ashley Steel, E
Bartz, Krista K
Kingsolver, Joel G
Scheuerell, Mark D
Beckman, Brian R
Crozier, Lisa G
author_facet Angilletta, Michael J
Ashley Steel, E
Bartz, Krista K
Kingsolver, Joel G
Scheuerell, Mark D
Beckman, Brian R
Crozier, Lisa G
author_sort Angilletta, Michael J
collection PubMed
description Dams designed for hydropower and other purposes alter the environments of many economically important fishes, including Chinook salmon (Oncorhynchus tshawytscha). We estimated that dams on the Rogue River, the Willamette River, the Cowlitz River, and Fall Creek decreased water temperatures during summer and increased water temperatures during fall and winter. These thermal changes undoubtedly impact the behavior, physiology, and life histories of Chinook salmon. For example, relatively high temperatures during the fall and winter should speed growth and development, leading to early emergence of fry. Evolutionary theory provides tools to predict selective pressures and genetic responses caused by this environmental warming. Here, we illustrate this point by conducting a sensitivity analysis of the fitness consequences of thermal changes caused by dams, mediated by the thermal sensitivity of embryonic development. Based on our model, we predict Chinook salmon likely suffered a decrease in mean fitness after the construction of a dam in the Rogue River. Nevertheless, these demographic impacts might have resulted in strong selection for compensatory strategies, such as delayed spawning by adults or slowed development by embryos. Because the thermal effects of dams vary throughout the year, we predict dams impacted late spawners more than early spawners. Similar analyses could shed light on the evolutionary consequences of other environmental perturbations and their interactions.
format Online
Article
Text
id pubmed-3352442
institution National Center for Biotechnology Information
language English
publishDate 2008
publisher Blackwell Publishing Ltd
record_format MEDLINE/PubMed
spelling pubmed-33524422012-05-24 Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences Angilletta, Michael J Ashley Steel, E Bartz, Krista K Kingsolver, Joel G Scheuerell, Mark D Beckman, Brian R Crozier, Lisa G Evol Appl Original Articles Dams designed for hydropower and other purposes alter the environments of many economically important fishes, including Chinook salmon (Oncorhynchus tshawytscha). We estimated that dams on the Rogue River, the Willamette River, the Cowlitz River, and Fall Creek decreased water temperatures during summer and increased water temperatures during fall and winter. These thermal changes undoubtedly impact the behavior, physiology, and life histories of Chinook salmon. For example, relatively high temperatures during the fall and winter should speed growth and development, leading to early emergence of fry. Evolutionary theory provides tools to predict selective pressures and genetic responses caused by this environmental warming. Here, we illustrate this point by conducting a sensitivity analysis of the fitness consequences of thermal changes caused by dams, mediated by the thermal sensitivity of embryonic development. Based on our model, we predict Chinook salmon likely suffered a decrease in mean fitness after the construction of a dam in the Rogue River. Nevertheless, these demographic impacts might have resulted in strong selection for compensatory strategies, such as delayed spawning by adults or slowed development by embryos. Because the thermal effects of dams vary throughout the year, we predict dams impacted late spawners more than early spawners. Similar analyses could shed light on the evolutionary consequences of other environmental perturbations and their interactions. Blackwell Publishing Ltd 2008-05 /pmc/articles/PMC3352442/ /pubmed/25567632 http://dx.doi.org/10.1111/j.1752-4571.2008.00032.x Text en © 2008 The Authors. Journal compilation © 2008 Blackwell Publishing Ltd
spellingShingle Original Articles
Angilletta, Michael J
Ashley Steel, E
Bartz, Krista K
Kingsolver, Joel G
Scheuerell, Mark D
Beckman, Brian R
Crozier, Lisa G
Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title_full Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title_fullStr Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title_full_unstemmed Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title_short Big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
title_sort big dams and salmon evolution: changes in thermal regimes and their potential evolutionary consequences
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3352442/
https://www.ncbi.nlm.nih.gov/pubmed/25567632
http://dx.doi.org/10.1111/j.1752-4571.2008.00032.x
work_keys_str_mv AT angillettamichaelj bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT ashleysteele bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT bartzkristak bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT kingsolverjoelg bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT scheuerellmarkd bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT beckmanbrianr bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences
AT crozierlisag bigdamsandsalmonevolutionchangesinthermalregimesandtheirpotentialevolutionaryconsequences