A continental‐scale analysis of fish assemblage functional structure in European rivers

Logez, Maxime; Bady, Pierre; Melcher, Andreas; Pont, Didier

doi:10.1111/j.1600-0587.2012.07447.x

Cited by 62 publications

(48 citation statements)

References 98 publications

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“…This is the magnitude of the temperature differentiation of fish zones and in particular for the occurrence of native cold-water-preferring and warm-water-preferring fish species (Logez et al, 2013;Melcher et al, 2013;Pletterbauer et al, 2015). At a stream temperature of 20 • C, cold-wateradapted species begin to experience temperature-induced mortality (Melcher et al, 2014;Schaufler 2015).…”

Section: Discussionmentioning

confidence: 99%

Can riparian vegetation shade mitigate the expected rise in stream temperatures due to climate change during heat waves in a human-impacted pre-alpine river?

Trimmel

Weihs

Leidinger

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Global warming has already affected European rivers and their aquatic biota, and climate models predict an increase of temperature in central Europe over all seasons. We simulated the influence of expected changes in heat wave intensity during the 21st century on water temperatures of a heavily impacted pre-alpine Austrian river and analysed future mitigating effects of riparian vegetation shade on radiant and turbulent energy fluxes using the deterministic Heat Source model. Modelled stream water temperature increased less than 1.5 • C within the first half of the century. Until 2100, a more significant increase of around 3 • C in minimum, maximum and mean stream temperatures was predicted for a 20-year return period heat event. The result showed clearly that in a highly altered river system riparian vegetation was not able to fully mitigate the predicted temperature rise caused by climate change but would be able to reduce water temperature by 1 to 2 • C. The removal of riparian vegetation amplified stream temperature increases. Maximum stream temperatures could increase by more than 4 • C even in annual heat events. Such a dramatic water temperature shift of some degrees, especially in summer, would indicate a total shift of aquatic biodiversity. The results demonstrate that effective river restoration and mitigation require re-establishing riparian vegetation and emphasize the importance of land-water interfaces and their ecological functioning in aquatic environments.

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Section: Discussionmentioning

confidence: 99%

Can riparian vegetation shade mitigate the expected rise in stream temperatures due to climate change during heat waves in a human-impacted pre-alpine river?

Trimmel

Weihs

Leidinger

et al. 2018

Hydrol. Earth Syst. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Following the theory of habitat filtering, local assemblages are composed of species selected on their traits by the environmental conditions (Keddy, 1992). Among the environmental drivers, temperature was shown to be the major determinant of the functional structure of European fish assemblages (Logez et al, 2012a). Therefore, global warming will likely affect both the composition and the functional structure of fish assemblages.…”

Section: Introductionmentioning

confidence: 99%

Global warming and potential shift in reference conditions: the case of functional fish-based metrics

Logez¹,

Pont²

2012

Hydrobiologia

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The reference condition approach, advocated by the Water Framework Directive, is the basis of most currently used multimetric indices using functional traits of fish species. The ecological status of streams is assessed by measuring the deviation of the observed trait values from the theoretical values of reference conditions in the absence of anthropogenic disturbances. While reference conditions serve as baselines for ecological assessment, they vary with natural environmental conditions. Therefore, global warming appears to be a major threat to the use of current indices for diagnosing future stream conditions, as climate change is projected to modify assemblage composition, suggesting that the functional structure of fish assemblages will also be affected. The main objectives of this study are to assess the potential effect of climate change on the trait composition of fish assemblages and the consequences for the establishment of reference conditions. The results highlight the relation between environmental, especially climatic, conditions and functional traits and project the effects of climate change on trait composition. Traits based on species intolerance are expected to be most negatively affected by the projected climatic shift. The consequences for the development of multimetric indices based on fish functional traits are discussed.

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“…In rivers, temperature exerts an important control on physiochemical characteristics of water [15] and it is a driver of Water 2017, 9, 358 2 of 16 numerous biological processes, controlling the structure of ecological communities and habitat complexity [16,17]. Approaches for measuring stream water temperature cover a wide range of methods including temperature loggers and thermometers [18][19][20], fiber-optic distributed temperature sensing (FO-DTS) [21,22] and thermal infrared (TIR) cameras [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Exploring Streamwater Mixing Dynamics via Handheld Thermal Infrared Imagery

Antonelli

Klaus

Smettem

et al. 2017

Water

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Abstract:Stream confluences are important hotspots of aquatic ecological processes. Water mixing dynamics at stream confluences influence physio-chemical characteristics of the stream as well as sediment mobilisation and pollutant dispersal. In this study, we investigated the potential for handheld thermal infrared (TIR) imagery to provide rapid information on stream water mixing dynamics at small scales. In-situ visualisation of water mixing patterns can help reduce analytical errors related to stream water sampling locations and improve our understanding of how confluences and tributaries influence aquatic ecological communities. We compared TIR-inferred stream temperature distributions with water electrical conductivity and temperature (measured with a submerged probe) data from cross-channel transects. We show that the use of a portable TIR camera can enhance the visualisation of mixing dynamics taking place at stream confluences, identify the location of the mixing front between two different water sources and the degree of mixing. Interpretation of handheld TIR observations also provided information on how stream morphology and discharge can influence mixing dynamics in small streams. Overall, this study shows that TIR imagery is a valuable support technique for eco-hydrological investigation at small stream confluences.

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A continental‐scale analysis of fish assemblage functional structure in European rivers

Cited by 62 publications

References 98 publications

Can riparian vegetation shade mitigate the expected rise in stream temperatures due to climate change during heat waves in a human-impacted pre-alpine river?

Can riparian vegetation shade mitigate the expected rise in stream temperatures due to climate change during heat waves in a human-impacted pre-alpine river?

Global warming and potential shift in reference conditions: the case of functional fish-based metrics

Exploring Streamwater Mixing Dynamics via Handheld Thermal Infrared Imagery

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