In situ feeding assay with Gammarus fossarum (Crustacea): Modelling the influence of confounding factors to improve water quality biomonitoring

Coulaud, Romain; Geffard, Olivier; Xuereb, Benoît; Lacaze, Émilie; Quéau, H.; Garric, Jeanne; Charles, Sandrine; Chaumot, Arnaud

doi:10.1016/j.watres.2011.09.035

Cited by 84 publications

(116 citation statements)

References 38 publications

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“…Gammarids were collected from a reference site of the Bourbre River (France; Coulaud et al, 2011) three weeks before feeding assays (two campaigns) to allow acclimatization in laboratory conditions (drilled groundwater, water temperature 12 °C, constant oxygenation, conductivity ∼500 µS cm−1, 16/8-h light/dark photoperiod, ad libitum feeding with Alnus leaves). At each sampling time, 540 male G. fossarum of homogenous body size (9.9 [±0.7] mm and 10.0 [±0.1] mm at Day 22 and Day 40 feeding assays, respectively) were sorted to avoid any sex or size effect on the studied responses (Coulaud et al, 2011). For each treatment, three independent replicates were carried out in plastic microcosms.…”

Section: Feeding Rates Of Gammarus Fossarummentioning

confidence: 99%

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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Highlights• The combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition (LLD) were assessed.• TBZ applied alone had no significant effect on LLD.• Drought strongly impacted the microbial LLD process and led to cascading effects on Gammarus feeding.• Structural and functional effects increased when drought and TBZ were applied simultaneously. AbstractLoss of biodiversity and altered ecosystem functioning are driven by the cumulative effects of multiple natural and anthropogenic stressors affecting both quantity and quality of water resources. Here we performed a 40-day laboratory microcosm experiment to assess the individual and combined effects of drought and the model fungicide tebuconazole (TBZ) on leaf litter decomposition (LLD), a fundamental biogeochemical process in freshwater ecosystems. Starting out from a worst-case scenario perspective, leaf-associated microbial communities were exposed to severe drought conditions (four 5-day drought periods alternated with 4-day immersion periods) and/or a chronic exposure to TBZ (nominal concentration of 20 µg L−1). We assessed the direct effects of drought and fungicide on the structure (biomass, diversity) and activity (extracellular enzymatic potential) of fungal and bacterial assemblages colonizing leaves. We also investigated indirect effects on the feeding rates of the amphipod Gammarus fossarum on leaves previously exposed to drought and/or TBZ contamination. Results indicate a stronger effect of drought stress than fungicide contamination under the experimental conditions applied. Indeed, the drought stress strongly impacted microbial community structure and activities, inhibiting the LLD process and leading to cascading effects on macroinvertebrate feeding. However, despite the lack of significant effect of TBZ applied alone, the effects of drought on microbial functions (i.e., decrease in LLD and in enzymatic activities) and on Gammarus feeding rates were more pronounced when drought and TBZ stresses were applied together. In a perspective of ecological risk assessment and ecosystem management for sustainability, these findings stress the need for deeper insight into how multiple stressors can affect the functioning of aquatic ecosystems and associated services.

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Section: Feeding Rates Of Gammarus Fossarummentioning

confidence: 99%

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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“…The body size was measured using SigmaScan Ò Pro v5.0 imaging software (Systat Software). The reported body size corresponded to the dorsal length between the start of the prosoma and the end of the metasoma, as described by Coulaud et al (2011). Exposure of adult males was started within 48 h of collection in the field.…”

Section: Selection Of the Study Sites And Physicochemical Characterizmentioning

confidence: 99%

“…The FR was quantified as the rate of leaf consumption, as described by Coulaud et al (2011). The FR of males from Ardi, Bacu, Bois, and Tour populations was measured under laboratory common garden clean conditions, on two sampling dates (May and December 2012).…”

Section: Feeding Assaysmentioning

confidence: 99%

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Evolution of cadmium tolerance and associated costs in a Gammarus fossarum population inhabiting a low-level contaminated stream

Vigneron¹,

Geffard²,

Coquery³

et al. 2015

Ecotoxicology

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Deciphering evolutionary processes occurring within long-term contaminated wild populations is essential for the ecological risk assessment of persistent chemical contaminations. Using field populations of Gammarus, a commonly-used genus in aquatic ecotoxicology, the present study sought to gain insights into the extent to which long-term exposure to metals in the field could effectively lead to shifts in toxicological sensitivities. For this, we identified a Gammarus population inhabiting a stream contaminated by cadmium (Cd). We compared the Cd-exposure and Cd-sensitivity of this population to those of five reference populations. Active biomonitoring determined in different years and seasons that significant levels of Cd were bioavailable in the contaminated site. Laboratory sensitivity tests under common garden conditions established that this long-term field exposure led to the development of a moderate Cd tolerance, which was maintained after a 3-week acclimatization in the laboratory, and transmitted to offspring produced under clean conditions. The potential physiological costs of tolerance were assessed by means of feeding rate measurements (in the laboratory and in situ). They revealed that, unlike for reference populations, the feeding activity of organisms from the tolerant population was greatly decreased when they were maintained under laboratory conditions, potentially indicating a high population vulnerability to environmental perturbations. Because dissolved Cd concentrations in water from the contaminated site were low (averaging 0.045 µg L(-1)) and below the current European environmental quality standard for Cd for inland surface waters (fixed at 0.08 µg L(-1) in soft water environments), this case study sheds light onto the extent to which current environmental quality standards are protective against potential adverse outcomes of adaptive and micro-evolutionary processes occurring in contaminated environments.

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“…Moreover, loss of leaf material during decay might be increased in mesh bags. Our approach also differs from [12], who exposed 20 gammarids in opaque polyethylen cylinders (10 cm length, 5.5 cm diameter) caped with nylon mesh (1 mm mesh size) fixed in dark rigid plastic containers with a lid. Our transparent rigid plexiglass tubes provide good shelter as well as the natural diurnal photoperiod for the exposed animals.…”

Section: Test Performancementioning

confidence: 99%

Active <i>in Situ</i> Biomonitoring of Pesticide Pulses Using <i>Gammarus</i> spp. in Small Tributaries of Lake Constance

Gerhardt¹,

Koster²,

Lang³

et al. 2012

JEP

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Gammarids are important members of a stream's macrozoobenthos biocoenosis and food web. Moreover, they proved to be very sensitive towards different types of pollution. GamTox TM is a new in situ ecotoxicity test, based on survival and feeding behavior of caged gammarids for active monitoring of small streams in agricultural areas. GamTox TM has been applied in two streams with specific pollution problems in the catchment of Lake Constance. Ten organisms were exposed in 5 replicates in flow through test tubes containing one conditioned alder leaf, placed in baskets which were attached in the stream bottom and on the banks. Each week, the number of living animals was counted, the percentage of leaf skeletized estimated in semi-quantitative classes and a new elder leaf provided. Dead organisms were removed. Simultaneously, chemical analyses of pesticides and nutrients (N-compounds, P) were performed on cumulative water samples over one week. Moreover, macrozoobenthos was collected and determined according to the IBCH method, and the SPEAR index calculated. GamTox TM proved to be very sensitive to detect pesticides, copper as well as nutrients, both during acute pollution pulses and chronic exposures of up to 6 weeks. Survival turned out to be a more sensitive and less variable parameter than feeding. GamTox TM is easy to perform and directly provides a measure of ecotoxicological effects of toxicant/nutrient mixtures, which cannot be predicted by biological indices based on macrozoobenthos data such as IBCH and SPEAR-index.

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In situ feeding assay with Gammarus fossarum (Crustacea): Modelling the influence of confounding factors to improve water quality biomonitoring

Cited by 84 publications

References 38 publications

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Evolution of cadmium tolerance and associated costs in a Gammarus fossarum population inhabiting a low-level contaminated stream

Active <i>in Situ</i> Biomonitoring of Pesticide Pulses Using <i>Gammarus</i> spp. in Small Tributaries of Lake Constance

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In situ feeding assay with Gammarus fossarum (Crustacea): Modelling the influence of confounding factors to improve water quality biomonitoring

Cited by 84 publications

References 38 publications

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Evolution of cadmium tolerance and associated costs in a Gammarus fossarum population inhabiting a low-level contaminated stream

Active &lt;i&gt;in Situ&lt;/i&gt; Biomonitoring of Pesticide Pulses Using &lt;i&gt;Gammarus&lt;/i&gt; spp. in Small Tributaries of Lake Constance

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Active <i>in Situ</i> Biomonitoring of Pesticide Pulses Using <i>Gammarus</i> spp. in Small Tributaries of Lake Constance