Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios

Future water temperature changes may have a profound impact on fish-parasite interactions. However, while the effect of temperature on fish, and particularly salmonids, is well-understood, its combined effects with parasitic exposure are not. Here, we use a multi-stage experimental approach to explo...

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Autores principales:	Roser Casas-Mulet, Emily Matthews, Juergen Geist, Isabelle Durance, Jo Cable
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Climate change Hydropeaking Thermopeaking Multiple stressors Fish infectious disease River resilience management Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/8925489857914f7c9f5322ce72def8d4
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spelling	oai:doaj.org-article:8925489857914f7c9f5322ce72def8d42021-11-22T04:33:14ZNegative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios2666-900510.1016/j.ecochg.2021.100039https://doaj.org/article/8925489857914f7c9f5322ce72def8d42021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666900521000393https://doaj.org/toc/2666-9005Future water temperature changes may have a profound impact on fish-parasite interactions. However, while the effect of temperature on fish, and particularly salmonids, is well-understood, its combined effects with parasitic exposure are not. Here, we use a multi-stage experimental approach to explore the impact of increased water temperatures consistent with persistent climate change-induced warming and extreme thermal fluctuations from hydropower (thermopeaking) on brown trout alevins and fry before and during exposure to Saprolegnia parasitica. Parasite exposure had the strongest and most significant effect on survival of both host life stages. The combination of parasite exposure, thermal pre-conditioning and the ongoing thermal regime had a weak but significant influence on alevin mortality. Both parasite-exposed alevin and fry experienced increased mortality when a constant increase in temperature was combined with intermittent thermal increases. The outcomes of this experimental approach provide the basis for future studies scaling up the potential impacts of temperatures and parasite exposure that key fish species may face in the wild. They also highlight the effects of anthropogenic changes on brown trout populations, as pressures on aquatic organisms are likely to intensify in future climate scenarios with increased hydropower development and thermopeaking, particularly in the presence of pathogens.Roser Casas-MuletEmily MatthewsJuergen GeistIsabelle DuranceJo CableElsevierarticleClimate changeHydropeakingThermopeakingMultiple stressorsFish infectious diseaseRiver resilience managementEcologyQH540-549.5ENClimate Change Ecology, Vol 2, Iss , Pp 100039- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Climate change Hydropeaking Thermopeaking Multiple stressors Fish infectious disease River resilience management Ecology QH540-549.5
spellingShingle	Climate change Hydropeaking Thermopeaking Multiple stressors Fish infectious disease River resilience management Ecology QH540-549.5 Roser Casas-Mulet Emily Matthews Juergen Geist Isabelle Durance Jo Cable Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
description	Future water temperature changes may have a profound impact on fish-parasite interactions. However, while the effect of temperature on fish, and particularly salmonids, is well-understood, its combined effects with parasitic exposure are not. Here, we use a multi-stage experimental approach to explore the impact of increased water temperatures consistent with persistent climate change-induced warming and extreme thermal fluctuations from hydropower (thermopeaking) on brown trout alevins and fry before and during exposure to Saprolegnia parasitica. Parasite exposure had the strongest and most significant effect on survival of both host life stages. The combination of parasite exposure, thermal pre-conditioning and the ongoing thermal regime had a weak but significant influence on alevin mortality. Both parasite-exposed alevin and fry experienced increased mortality when a constant increase in temperature was combined with intermittent thermal increases. The outcomes of this experimental approach provide the basis for future studies scaling up the potential impacts of temperatures and parasite exposure that key fish species may face in the wild. They also highlight the effects of anthropogenic changes on brown trout populations, as pressures on aquatic organisms are likely to intensify in future climate scenarios with increased hydropower development and thermopeaking, particularly in the presence of pathogens.
format	article
author	Roser Casas-Mulet Emily Matthews Juergen Geist Isabelle Durance Jo Cable
author_facet	Roser Casas-Mulet Emily Matthews Juergen Geist Isabelle Durance Jo Cable
author_sort	Roser Casas-Mulet
title	Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
title_short	Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
title_full	Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
title_fullStr	Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
title_full_unstemmed	Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios
title_sort	negative effects of parasite exposure and variable thermal stress on brown trout (salmo trutta) under future climatic and hydropower production scenarios
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/8925489857914f7c9f5322ce72def8d4
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Negative effects of parasite exposure and variable thermal stress on brown trout (Salmo trutta) under future climatic and hydropower production scenarios

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