River Temperature Variations and Potential Effects on Fish in a Typical Yangtze River Reach: Implications for Management

Zhang, H.

doi:10.15666/aeer/1404_553567

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…The hydro‐environment required by Chinese sturgeon has also been dramatically influenced (Gao, Lin, Li, Duan, & Liu, ; Wang & Xia, ; Zhang, Yang, Wei, Du, & Wang, ; Zhang et al, ), resulting in reduction of spawning ground. Flow regime alterations caused by the TGD operation have greatly decreased median monthly flows during the spawning season, especial in October (Table ).…”

Section: Resultsmentioning

confidence: 99%

A framework to assess the cumulative impacts of dams on hydrological regime: A case study of the Yangtze River

Wang

Lewis

et al. 2017

Hydrological Processes

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Comparisons of flow time series between preimpact and postimpact periods have been widely used to determine hydrological alterations caused by reservoir operation. However, preimpact and postimpact periods might also be characterized by different climatological properties, a problem that has not been well addressed. In this study, we propose a framework to assess the cumulative impact of dams on hydrological regime over time. The impacts of the Three Gorges Dam (TGD) on the flow regime of the Yangtze River were investigated using this framework. We reconstructed the unregulated flow series to compare with the regulated flow series during the same period (2010 to 2015). Eco-surplus and eco-deficit and the Indicators of Hydrologic Alteration (IHA) parameters were used to examine hydrological regime change. Among 32 IHA parameters, Wilcoxon signed-rank test and principal component analysis identified the October median flow, 1-and 3-day maximum flows, 1-day minimum flow, and rise rate as representative indicators of hydrological alterations. Eco-surplus and eco-deficit showed that the reservoir also changed the seasonal regime of the flows by reducing autumn flow and increasing winter flow. Changes in annual extreme flows and October flows lead to negative ecological implications downstream of the TGD. Ecological considerations should be taken into account during operation of the TGD in order to mitigate the negative effects on the fluvial ecosystem in the middle reach of Yangtze River. The framework proposed here could be a robust method to assess the cumulative impacts of reservoir operation over time.

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Section: Resultsmentioning

confidence: 99%

A framework to assess the cumulative impacts of dams on hydrological regime: A case study of the Yangtze River

Wang

Lewis

et al. 2017

Hydrological Processes

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“…This suitability index can be used as a standard index to evaluate the daily water temperature for spawning fish. The temperature suitability index for spawning of the Chinese sturgeon was imported from Zhang et al [30]. It was based on ten spawning temperatures in historic spawning areas [10] and 20 spawning temperatures in recent spawning areas [29].…”

Section: Methodsmentioning

confidence: 99%

“…Mann–Kendall trend tests (two-tailed) were used to test whether there was a variation trend in the average water temperatures monthly and yearly in the period 1956–2016 (61 years) at Yichang station (Figure 1) [30]. The null hypothesis, H 0 , for these tests is that there was no trend in the series.…”

Section: Methodsmentioning

confidence: 99%

Increasing River Temperature Shifts Impact the Yangtze Ecosystem: Evidence from the Endangered Chinese Sturgeon

Zhang

Kang

et al. 2019

Animals

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The Yangtze River has the third greatest water flow and is one of the most human-influenced rivers in the world. Since 1950, this river system has experienced drastic human interventions, leading to various environmental changes, including water temperature. In this study, based on observations during the past sixty years, we found that the seasonal temperature regime has been altered, both temporally (1–5 °C variation) and spatially (>626 km distance). Temperature shifts not only delay the timing of fish spawning directly, but also lead to degeneration in gonad development. Temperature regime alterations have delayed the suitable spawning temperature window by approximately 29 days over a decade (2003–2016). It confirmed that a period of lower temperature, higher cumulative temperature, and relatively higher temperature differences promoted the maturation of potential spawners based on the correlation analysis (p < 0.05). Also, thermal alterations were highly correlated with reservoir capacity upstream (R2 = 0.866). On-going cascade dam construction and global warming will lead to further temperature shifts. Currently, rigorous protection measures on the breeding population of the Chinese sturgeon and its critical habitats is urgently needed to prevent the crisis of the species extinction. Increasing river thermal shifts not only threaten the Chinese sturgeon but also affect the entire Yangtze aquatic ecosystem.

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“…The selective sweeps related to genes involved in embryo development may be attributed to an advancement of spawning time in Tibet (Liu, Chen, et al, 2015) and subsequent exposure of embryos to cold waters. The water temperature during reproduction period is about 20°C in the native range (e.g., the mid‐ and lower Yangtze River) and is below 10°C in the invasive range (Huo et al, 2013; Zhang et al, 2016). Low temperature exposure can increase the mortality and frequency of abnormal larvae in C. auratus (Wiegand et al, 1989), resulting in individual selection during embryonic development.…”

Section: Discussionmentioning

confidence: 99%

Genetic responses in sexual diploid and unisexual triploid goldfish (Carassius auratus) introduced into a high‐altitude environment

et al. 2023

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Anthropogenic biological invasions represent major concerns but enable us to investigate rapid evolutionary changes and adaptation to novel environments. The goldfish Carassius auratus with sexual diploids and unisexual triploids coexisting in natural waters is one of the most widespread invasive fishes in Tibet, providing an ideal model to study evolutionary processes during invasion in different reproductive forms from the same vertebrate. Here, using whole‐genome resequencing data of 151 C. auratus individuals from invasive and native ranges, we found different patterns of genomic responses between diploid and triploid populations during their invasion of Tibet. For diploids, although invasive individuals derived from two different genetically distinct sources had a relative higher diversity (π) at the population level, their individual genetic diversity (genome‐wide observed heterozygosity) was significantly lower (21.4%) than that of source individuals. Population structure analysis revealed that the invasive individuals formed a specific genetic cluster distinct from the source populations. Runs of homozygosity analysis showed low inbreeding only in invasive individuals, and only the invasive population experienced a recent decline in effective population size reflecting founder events. For triploids, however, invasive populations showed no loss of individual genetic diversity and no genetic differentiation relative to source populations. Regions of putative selective sweeps between invasive and source populations of diploids mainly involved genes associated with mannosidase activity and embryo development. Our results suggest that invasive diploids deriving from distinct sources still lost individual genetic diversity resulting from recent inbreeding and founder events and selective sweeps, and invasive triploids experienced no change in genetic diversity owing to their reproduction mode of gynogenesis that precludes inbreeding and founder effects and may make them more powerful invaders.

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River Temperature Variations and Potential Effects on Fish in a Typical Yangtze River Reach: Implications for Management

Cited by 13 publications

References 15 publications

A framework to assess the cumulative impacts of dams on hydrological regime: A case study of the Yangtze River

A framework to assess the cumulative impacts of dams on hydrological regime: A case study of the Yangtze River

Increasing River Temperature Shifts Impact the Yangtze Ecosystem: Evidence from the Endangered Chinese Sturgeon

Genetic responses in sexual diploid and unisexual triploid goldfish (Carassius auratus) introduced into a high‐altitude environment

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