Juvenile salmonid populations in a temperate river system track synoptic trends in climate
Widespread declines among Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) over recent decades have been linked to pollution, exploitation and catchment modification, but climate change is increasingly implicated. We used long-term, geographically extensive data from the Welsh River Wye,...
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Online Access: | https://orca.cardiff.ac.uk/id/eprint/23046/ https://doi.org/10.1111/j.1365-2486.2010.02211.x |
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:23046 2023-05-15T15:31:03+02:00 Juvenile salmonid populations in a temperate river system track synoptic trends in climate Clews, Esther Durance, Isabelle Vaughan, Ian Phillip Ormerod, Stephen James 2010-12 https://orca.cardiff.ac.uk/id/eprint/23046/ https://doi.org/10.1111/j.1365-2486.2010.02211.x unknown Wiley Clews, Esther https://orca.cardiff.ac.uk/view/cardiffauthors/A161838H.html, Durance, Isabelle https://orca.cardiff.ac.uk/view/cardiffauthors/A016469X.html orcid:0000-0002-4138-3349 orcid:0000-0002-4138-3349, Vaughan, Ian Phillip https://orca.cardiff.ac.uk/view/cardiffauthors/A042951C.html orcid:0000-0002-7263-3822 orcid:0000-0002-7263-3822 and Ormerod, Stephen James https://orca.cardiff.ac.uk/view/cardiffauthors/A035757Z.html orcid:0000-0002-8174-302X orcid:0000-0002-8174-302X 2010. Juvenile salmonid populations in a temperate river system track synoptic trends in climate. Global Change Biology 16 (12) , pp. 3271-3283. 10.1111/j.1365-2486.2010.02211.x https://doi.org/10.1111/j.1365-2486.2010.02211.x doi:10.1111/j.1365-2486.2010.02211.x Q Science (General) Article PeerReviewed 2010 ftunivcardiff https://doi.org/10.1111/j.1365-2486.2010.02211.x 2022-10-20T22:38:14Z Widespread declines among Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) over recent decades have been linked to pollution, exploitation and catchment modification, but climate change is increasingly implicated. We used long-term, geographically extensive data from the Welsh River Wye, formerly a major salmon river, to examine whether climatically mediated effects on juveniles (>0+) might contribute to population change. Populations of Atlantic salmon and brown trout fell across the Wye catchment, respectively, by 50% and 67% between 1985 and 2004, but could not be explained by pollution because water quality improved during this time. Stream temperatures, estimated from calibrations against weekly air temperature at eight sites, increased by 0.5–0.7 °C in summer and 0.7–1.0 °C in winter, with larger tributaries warming more than shaded headwaters. Rates of winter warming were slightly greater after accounting for the effect of the North Atlantic Oscillation (1.1–1.4 °C). However, warming through time was smaller than measured variations among tributaries, and alone was insufficient to explain variations in salmonid density. Instead, population variations were best explained in multilevel mixed models by a synoptic variate representing a trend towards hotter, drier summers, implying interactions between climate warming, varying discharge and fluctuations in both brown trout and salmon. Taken alongside recent data showing effects of warming on survival at sea, these data suggest that Atlantic salmon might be jeopardized by future climatic effects in both their marine and freshwater stages. Effects on nondiadromous brown trout also imply climatically mediated processes in freshwaters or their catchments. Climate projections for the United Kingdom suggest that altered summer flow and increasing summer temperatures could exacerbate losses further in these species, and we advocate management actions that combine reduced abstraction with enhanced riparian shading. Article in Journal/Newspaper Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar Cardiff University: ORCA (Online Research @ Cardiff) Global Change Biology 16 12 3271 3283 |
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Cardiff University: ORCA (Online Research @ Cardiff) |
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Q Science (General) |
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Q Science (General) Clews, Esther Durance, Isabelle Vaughan, Ian Phillip Ormerod, Stephen James Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
topic_facet |
Q Science (General) |
description |
Widespread declines among Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) over recent decades have been linked to pollution, exploitation and catchment modification, but climate change is increasingly implicated. We used long-term, geographically extensive data from the Welsh River Wye, formerly a major salmon river, to examine whether climatically mediated effects on juveniles (>0+) might contribute to population change. Populations of Atlantic salmon and brown trout fell across the Wye catchment, respectively, by 50% and 67% between 1985 and 2004, but could not be explained by pollution because water quality improved during this time. Stream temperatures, estimated from calibrations against weekly air temperature at eight sites, increased by 0.5–0.7 °C in summer and 0.7–1.0 °C in winter, with larger tributaries warming more than shaded headwaters. Rates of winter warming were slightly greater after accounting for the effect of the North Atlantic Oscillation (1.1–1.4 °C). However, warming through time was smaller than measured variations among tributaries, and alone was insufficient to explain variations in salmonid density. Instead, population variations were best explained in multilevel mixed models by a synoptic variate representing a trend towards hotter, drier summers, implying interactions between climate warming, varying discharge and fluctuations in both brown trout and salmon. Taken alongside recent data showing effects of warming on survival at sea, these data suggest that Atlantic salmon might be jeopardized by future climatic effects in both their marine and freshwater stages. Effects on nondiadromous brown trout also imply climatically mediated processes in freshwaters or their catchments. Climate projections for the United Kingdom suggest that altered summer flow and increasing summer temperatures could exacerbate losses further in these species, and we advocate management actions that combine reduced abstraction with enhanced riparian shading. |
format |
Article in Journal/Newspaper |
author |
Clews, Esther Durance, Isabelle Vaughan, Ian Phillip Ormerod, Stephen James |
author_facet |
Clews, Esther Durance, Isabelle Vaughan, Ian Phillip Ormerod, Stephen James |
author_sort |
Clews, Esther |
title |
Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
title_short |
Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
title_full |
Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
title_fullStr |
Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
title_full_unstemmed |
Juvenile salmonid populations in a temperate river system track synoptic trends in climate |
title_sort |
juvenile salmonid populations in a temperate river system track synoptic trends in climate |
publisher |
Wiley |
publishDate |
2010 |
url |
https://orca.cardiff.ac.uk/id/eprint/23046/ https://doi.org/10.1111/j.1365-2486.2010.02211.x |
genre |
Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar |
genre_facet |
Atlantic salmon North Atlantic North Atlantic oscillation Salmo salar |
op_relation |
Clews, Esther https://orca.cardiff.ac.uk/view/cardiffauthors/A161838H.html, Durance, Isabelle https://orca.cardiff.ac.uk/view/cardiffauthors/A016469X.html orcid:0000-0002-4138-3349 orcid:0000-0002-4138-3349, Vaughan, Ian Phillip https://orca.cardiff.ac.uk/view/cardiffauthors/A042951C.html orcid:0000-0002-7263-3822 orcid:0000-0002-7263-3822 and Ormerod, Stephen James https://orca.cardiff.ac.uk/view/cardiffauthors/A035757Z.html orcid:0000-0002-8174-302X orcid:0000-0002-8174-302X 2010. Juvenile salmonid populations in a temperate river system track synoptic trends in climate. Global Change Biology 16 (12) , pp. 3271-3283. 10.1111/j.1365-2486.2010.02211.x https://doi.org/10.1111/j.1365-2486.2010.02211.x doi:10.1111/j.1365-2486.2010.02211.x |
op_doi |
https://doi.org/10.1111/j.1365-2486.2010.02211.x |
container_title |
Global Change Biology |
container_volume |
16 |
container_issue |
12 |
container_start_page |
3271 |
op_container_end_page |
3283 |
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1766361543689109504 |