Impacts of small dams on stream temperature

Zaidel, Peter A.; Roy, Allison H.; Houle, Kristopher M.; Lambert, Beth C.; Letcher, Benjamin H.; Nislow, Keith H.; Smith, Christopher

doi:10.1016/j.ecolind.2020.106878

Cited by 58 publications

(45 citation statements)

References 44 publications

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“…The mitigating influence of dams could be of importance for streams in the southern headwaters of the Loire basin since this area both experienced the greatest Tw trends and gathers most of existing large dams. On the other hand, ponds and shallow reservoirs, by releasing warm water can increase downstream Tw (Seyedhashemi et al, 2020;Zaidel et al, 2020;Chandesris et al, 2019) and exacerbate increasing trends in Tw (Wanders et al, 2019;Michel et al, 2020). Nevertheless, the warming effect can be local, and unregulated streams being located closer to such regulated streams may show limited to no warming (Wanders et al, 2019).…”

Section: Natural Trends and Anthropogenic Influence On Twmentioning

confidence: 99%

Regional, multi-decadal analysis reveals that stream temperature increases faster than air temperature

Seyedhashemi

Vidal

Diamond

et al. 2021

Preprint

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Abstract. Stream temperature appears to be increasing globally, but its rate remains poorly constrained due to a paucity of long-term data and difficulty in parsing effects of hydroclimate and landscape variability. Here, we address these issues using the physically-based thermal model T-NET (Temperature-NETwork) coupled with the EROS semi-distributed hydrological model to reconstruct past daily stream temperature and streamflow at the scale of the entire Loire River basin in France (105 km2 with 52278 reaches). Stream temperature increased for almost all reaches in all seasons (mean = +0.38 °C/decade) over the 1963–2019 period. Increases were greatest in spring and summer with a median increase of +0.38 °C (range = +0.11– +0.76 °C) and +0.44 °C (+0.08– +1.02 °C) per decade, respectively. Rates of stream temperature increases were greater than for air temperature across seasons for 50–86 % of reaches. Spring and summer increases were typically the greatest in the southern headwaters (up to +1 °C/decade) and in the largest rivers (Strahler order > 5). Importantly, air temperature and streamflow exerted joint influence on stream temperature trends, where the greatest stream temperature increases were accompanied by similar trends in air temperature (up to +0.71 °C/decade) and the greatest decreases in streamflow (up to −16 %/decade). Indeed, for the majority of reaches, positive stream temperature anomalies exhibited synchrony with positive anomalies in air temperature and negative anomalies in streamflow, highlighting the dual control exerted by these hydroclimatic drivers. Moreover, spring and summer stream temperature, air temperature, and streamflow time series exhibited common change-points occurring in the late 1980s, suggesting a temporal coherence between changes in the hydroclimatic drivers and a rapid stream temperature response. Critically, riparian vegetation shading mitigated stream temperature increases by up to 16 % in smaller streams (i.e., < 30 km from the source). Our results provide strong support for basin-wide increases in stream temperature due to joint effects of rising air temperature and reduced streamflow. We suggest that some of these climate change-induced effects can be mitigated through the restoration and maintenance of riparian forests, and call for continued high-resolution monitoring of stream temperature at large scales.

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Section: Natural Trends and Anthropogenic Influence On Twmentioning

confidence: 99%

Regional, multi-decadal analysis reveals that stream temperature increases faster than air temperature

Seyedhashemi

Vidal

Diamond

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…Many of these effects could be exacerbated by a warmer climate, as suggested by our findings. Higher temperature could hence lead to longer periods of desiccation in the by-passed river channels downstream of hydropower reservoirs (Poole & Berman, 2001;Renöfält et al, 2010;Vander Vorste et al, 2020), diminished access to thermal refugia (Fullerton et al, 2018), reduced oxygen concentration in the hyporheic zone, which will affect both trout reproduction as well as invertebrates communities (Calles et al, 2007), and increased water temperatures caused by the release of warm surface waters from hydropower reservoirs and small dams (Lessard & Hayes, 2003;Zaidel et al, 2021). Also, a warmer climate can favour the arrival of invasive species, potentially exacerbating predation and competition on brown trout populations (Daufresne & Boët, 2007;Dibble et al, 2020;Wenger et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Interactive effects of land use, river regulation, and climate on a key recreational fishing species in temperate and boreal streams

et al. 2021

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“…Heat exchange with the ambient climate is further increased through impediment of the flow of the river through dams and weirs (Caissie, 2006; Larned et al., 2010). Temperatures of water below dams have been shown to increase with more than 5°C as discharged water often originates from the hotter surface (eplimnion) of the reservoir (Zaidel et al., 2021). As a mitigating measure, especially in the case of deeper reservoirs, structures could be installed that would discharge water from the deep water (hypolimnion) which then could cool downstream waters (Sinokrot et al., 1995).…”

Section: Management Options For Mitigating Pkd In Salmonidsmentioning

confidence: 99%

Mitigating human impacts including climate change on proliferative kidney disease in salmonids of running waters

Ros

Schmidt‐Posthaus

Brinker

2022

Journal of Fish Diseases

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Over the last two decades, an increasing number of reports have identified a decline in salmonid populations, possibly linked to infection with the parasite Tetracapsuloides bryosalmonae and the corresponding disease, that is, proliferative kidney disease (PKD). The life cycle of this myxozoan parasite includes sessile bryozoan species as invertebrate host, which facilitates the distribution of the parasite in running waters. As the disease outcome is temperature dependent, the impact of the disease on salmonid populations is increasing with global warming due to climate change. The goal of this review is to provide a detailed overview of measures to mitigate the effects of PKD on salmonid populations. It first summarizes the parasite life cycle, temperature‐driven disease dynamics and new immunological and molecular research into disease resistance and, based on this, discusses management possibilities. Sophisticated management actions focusing on local adaptation of salmonid populations, restoration of the riverine ecosystem and keeping water temperatures cool are necessary to reduce the negative effects of PKD. Such actions include temporary stocking with PKD‐resistant salmonids, as this may assist in conserving current populations that fail to reproduce.

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Impacts of small dams on stream temperature

Cited by 58 publications

References 44 publications

Regional, multi-decadal analysis reveals that stream temperature increases faster than air temperature

Regional, multi-decadal analysis reveals that stream temperature increases faster than air temperature

Interactive effects of land use, river regulation, and climate on a key recreational fishing species in temperate and boreal streams

Mitigating human impacts including climate change on proliferative kidney disease in salmonids of running waters

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