How diatom-, invertebrate- and fish-based diagnostic tools can support the ecological assessment of rivers in a multi-pressure context: Temporal trends over the past two decades in France

Alric, Benjamin; Dézerald, Olivier; Meyer, Amélie; Billoir, Élise; Coulaud, Romain; Larras, Floriane; Mondy, Cédric P.; Usseglio‐Polatera, Philippe

doi:10.1016/j.scitotenv.2020.143915

Cited by 17 publications

(3 citation statements)

References 121 publications

(134 reference statements)

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“…Meanwhile, recent advances in environmental risk assessment studies have demonstrated that community-wide changes can be mechanistically related to a given stressor and can be determined with ecological diagnostic tools [18][19][20][21]. Several of these tools are based upon the foundational concept that combinations of morphological, physiological, and behavioral characteristics, as well as ecological preferences of species (i.e., species traits) in a given biological assemblage, can indicate how species interact with their environment and inform on various habitat characteristics, including anthropogenic pressures [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, trait-based responses to natural and anthropogenic pressure gradients can differ among biological compartments. For example, in streams, benthic diatoms, macroinvertebrates, and fishes respond diversely to micropollutant exposure, hydrological regime alteration, or the hydromorphological degradation of reaches [21,40,41]. Moreover, benthic diatoms and macroinvertebrates, exhibiting lower dispersal capacities and shorter life cycles than fishes, should react more rapidly to lower levels of water quality degradation (i.e., be better early warning indicators of degradation [41]).…”

Section: Introductionmentioning

confidence: 99%

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Linking Micropollutants to Trait Syndromes across Freshwater Diatom, Macroinvertebrate, and Fish Assemblages

Meyer

Alric

Dézerald

et al. 2022

Water

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The ecological quality of freshwater ecosystems is endangered by various micropollutants released into the environment by human activities. The cumulative effects of these micropollutants can affect the fitness of organisms and populations and the functional diversity of stream ecosystems. In this study, we investigated the relationships between the joint toxicity of micropollutants and trait syndromes. A trait syndrome corresponds to a combination of traits that could occur together in communities due to the trait selection driven by exposure to these micropollutants. Our objectives were to (i) identify trait syndromes specific to diatom, macroinvertebrate, and fish assemblages and their responses to exposure, taking into account four micropollutant types (mineral micropollutants, pesticides, PAHs, and other organic micropollutants) and nine modes of action (only for pesticides), (ii) explore how these syndromes vary within and among the three biological compartments, (iii) investigate the trait categories driving the responses of syndromes to micropollutant exposure, and (iv) identify specific taxa, so-called paragons, which are highly representative of these syndromes. To achieve these objectives, we analyzed a dataset including the biological and physico-chemical results of 2007 sampling events from a large-scale monitoring survey routinely performed in French wadeable streams. We have identified five (diatoms), eight (macroinvertebrates), and eight (fishes) trait syndromes, either positively or negatively related to an increasing toxicity gradient of different clusters of micropollutant types or modes of action. Our analyses identified several key trait categories and sets of paragons, exhibiting good potential for highlighting exposure by specific micropollutant types and modes of action. Overall, trait syndromes might represent a novel and integrative bioassessment tool, driven by the diversity of trait-based responses to increasing gradients of micropollutant toxic cocktails.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Linking Micropollutants to Trait Syndromes across Freshwater Diatom, Macroinvertebrate, and Fish Assemblages

Meyer

Alric

Dézerald

et al. 2022

Water

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“…The second is the ecological operation of reservoirs focusing on improving the ecological environment of rivers and the operation of eco-friendly reservoirs [9,10]. The third is the evaluation of the current ecological health of the basin [11,12]. The fourth is the evaluation of the reservoir operation plan.…”

Section: Introductionmentioning

confidence: 99%

The Decision of an Eco-Friendly Reservoir Operation Scheme Based on a Variable Set

Chen¹,

Li²,

Wang³

et al. 2021

Water

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The river ecosystem has the characteristics of the coexistence of clarity and ambiguity. The starting point of eco-friendly reservoir operation is to fully consider the ecological water requirements of the lower reaches of the reservoir, so it also has the characteristics of clarity and vagueness. The fuzzy theory is an excellent tool to realize the quantification of fuzzy concepts. In this paper, the variable set theory (VS) is introduced into the decision-making field of eco-friendly reservoir scheduling scheme optimization. Taking Ertan Hydropower Station as an example, the scheduling scheme optimization is carried out. To verify the effectiveness of the evaluation method, this paper compares and analyzes the evaluation results of the fuzzy set evaluation method and the composite fuzzy matter-element method. The results show that the variable fuzzy set method has the advantages of rigorous theory, a concise model, and simple calculation, and the decision result is reasonable and reliable. This research can provide new ideas for the decision-making research of engineering.

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Large-scale factors controlling biological communities in the Iberian Peninsula: an insight into global change effects on river ecosystems

Rocha Pompeu,

Peñas,

Belmar

et al. 2023

Aquat Sci

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The ongoing global environmental change poses a serious threat to rivers. Comprehensive knowledge of how stressors affect biota is critical for supporting effective management and conservation strategies. We evaluated the major gradients influencing spatial variability of freshwater biodiversity in continental Spain using landscape-scale variables representing climate, land use and land cover (LULC), flow regime, geology, topography, and diatom (n = 117), macroinvertebrate (n = 441), and fish (n = 264) communities surveyed in minimally impacted streams. Redundancy analysis identified the environmental factors significantly contributing to community variability, and specific multivariate analyses (RLQ method) were used to assess trait–environment associations. Environmental variables defined the major community change gradients (e.g., mountain–lowland). Siliceous, steep streams with increased precipitation levels favored stalked diatoms, macroinvertebrates with aquatic passive dissemination, and migrating fish. These traits were replaced by adnate diatoms, small macroinvertebrates, and non-migratory fish in lowland streams with warmer climates, calcareous geology, agriculture, and stable flow regimes. Overall, landscape-scale environmental variables better explained fish than diatom and macroinvertebrate community variability, suggesting that these latter communities might be more related to local-scale characteristics (e.g., microhabitat structure, substrate, and water physicochemistry). The upslope environmental gradient of river networks (e.g., slope, temperature, and LULC changes) was paralleled to the observed taxonomy-based and trait-based spatial variability. This result indicates that global change effects on riverine biodiversity could emerge as longitudinal distribution changes within river networks. Implementing management actions focusing simultaneously on water temperature, hydrological regime conservation (e.g., addressing LULC changes), and river continuity might be the best strategy for mitigating global change effects on river biodiversity.

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How diatom-, invertebrate- and fish-based diagnostic tools can support the ecological assessment of rivers in a multi-pressure context: Temporal trends over the past two decades in France

Cited by 17 publications

References 121 publications

Linking Micropollutants to Trait Syndromes across Freshwater Diatom, Macroinvertebrate, and Fish Assemblages

Linking Micropollutants to Trait Syndromes across Freshwater Diatom, Macroinvertebrate, and Fish Assemblages

The Decision of an Eco-Friendly Reservoir Operation Scheme Based on a Variable Set

Large-scale factors controlling biological communities in the Iberian Peninsula: an insight into global change effects on river ecosystems

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