Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam

River thermal regime is a critical factor affecting the initiation of spawning and breeding success in freshwater fish species. The four main domestic carps (FMDCs) and Chinese sturgeon are representative warm-water and cool-water fishes with different spawning thermal requirements in the Yangtze Ri...

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Autores principales:	Peng Zhang, Ye Qiao, Gaël Grenouillet, Sovan Lek, Lu Cai, Jianbo Chang
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Fish spawning Climate warming and cooling Thermal suitability index Cascading hydropower operation Chinese sturgeon Four major Chinese carps Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/e63bb8de328849538948650a42615af0
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spelling	oai:doaj.org-article:e63bb8de328849538948650a42615af02021-12-01T04:37:52ZResponses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam1470-160X10.1016/j.ecolind.2020.107186https://doaj.org/article/e63bb8de328849538948650a42615af02021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20311250https://doaj.org/toc/1470-160XRiver thermal regime is a critical factor affecting the initiation of spawning and breeding success in freshwater fish species. The four main domestic carps (FMDCs) and Chinese sturgeon are representative warm-water and cool-water fishes with different spawning thermal requirements in the Yangtze River Basin, China. This study focused on these two types of fish species below the Three Gorges Dam (TGD), and thermal response curves of fish spawning were constructed. The daily thermal suitability index (TSI) was simulated based on scenario analysis of climate-induced water warming and cooling. The variation in four TSI-based spawning indicators was then analyzed to evaluate the response of fish spawning to climate change and hydropower operation. The results showed that the spawning time is likely to be advanced by 1.3 days on average for the FMDCs and delayed by 2.1 days on average for the Chinese sturgeon with a 0.2 °C increase in the water temperature. For the FMDCs, climate warming would narrow the spawning window, although it may advance the spawning time that has been postponded by TGD operation, and climate cooling would widen the spawning window but further postpone spawning. For the Chinese sturgeon, climate warming would aggravate the negative impacts of TGD operation by further narrowing the spawning window and delaying spawning, while climate cooling would likely offset the negative impacts of TGD operation on fish spawning. We suggest that adjusting hydropower operation rules, e.g., elevating the water temperature in the early spawning period of the FMDCs to expand the spawning window and reducing the water temperature by at least 1.2 °C during the spawning period of the Chinese sturgeon, is essential for maintaining and restoring the natural spawning process and populations. Our study is also beneficial for inferring the cumulative impacts of cascading hydropower operations and provides insights for the management and conservation of fish species with different thermal tolerances in other hotspot regions.Peng ZhangYe QiaoGaël GrenouilletSovan LekLu CaiJianbo ChangElsevierarticleFish spawningClimate warming and coolingThermal suitability indexCascading hydropower operationChinese sturgeonFour major Chinese carpsEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107186- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fish spawning Climate warming and cooling Thermal suitability index Cascading hydropower operation Chinese sturgeon Four major Chinese carps Ecology QH540-549.5
spellingShingle	Fish spawning Climate warming and cooling Thermal suitability index Cascading hydropower operation Chinese sturgeon Four major Chinese carps Ecology QH540-549.5 Peng Zhang Ye Qiao Gaël Grenouillet Sovan Lek Lu Cai Jianbo Chang Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
description	River thermal regime is a critical factor affecting the initiation of spawning and breeding success in freshwater fish species. The four main domestic carps (FMDCs) and Chinese sturgeon are representative warm-water and cool-water fishes with different spawning thermal requirements in the Yangtze River Basin, China. This study focused on these two types of fish species below the Three Gorges Dam (TGD), and thermal response curves of fish spawning were constructed. The daily thermal suitability index (TSI) was simulated based on scenario analysis of climate-induced water warming and cooling. The variation in four TSI-based spawning indicators was then analyzed to evaluate the response of fish spawning to climate change and hydropower operation. The results showed that the spawning time is likely to be advanced by 1.3 days on average for the FMDCs and delayed by 2.1 days on average for the Chinese sturgeon with a 0.2 °C increase in the water temperature. For the FMDCs, climate warming would narrow the spawning window, although it may advance the spawning time that has been postponded by TGD operation, and climate cooling would widen the spawning window but further postpone spawning. For the Chinese sturgeon, climate warming would aggravate the negative impacts of TGD operation by further narrowing the spawning window and delaying spawning, while climate cooling would likely offset the negative impacts of TGD operation on fish spawning. We suggest that adjusting hydropower operation rules, e.g., elevating the water temperature in the early spawning period of the FMDCs to expand the spawning window and reducing the water temperature by at least 1.2 °C during the spawning period of the Chinese sturgeon, is essential for maintaining and restoring the natural spawning process and populations. Our study is also beneficial for inferring the cumulative impacts of cascading hydropower operations and provides insights for the management and conservation of fish species with different thermal tolerances in other hotspot regions.
format	article
author	Peng Zhang Ye Qiao Gaël Grenouillet Sovan Lek Lu Cai Jianbo Chang
author_facet	Peng Zhang Ye Qiao Gaël Grenouillet Sovan Lek Lu Cai Jianbo Chang
author_sort	Peng Zhang
title	Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
title_short	Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
title_full	Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
title_fullStr	Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
title_full_unstemmed	Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam
title_sort	responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the three gorges dam
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/e63bb8de328849538948650a42615af0
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Responses of spawning thermal suitability to climate change and hydropower operation for typical fishes below the Three Gorges Dam

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