Seasonal variations of the effect of temperature on lethal and sublethal toxicities of ammonia for three common freshwater shredders

Dehédin, Arnaud; Piscart, Christophe; Marmonier, Pierre

doi:10.1016/j.chemosphere.2012.07.055

Cited by 29 publications

(18 citation statements)

References 30 publications

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“…The higher glycogen content of A. aquaticus in all experiments could be selectively advantageous, enabling this isopod to survive under harsh conditions. This result may explain the higher NH 3 tolerance of A. aquaticus relative to other crustaceans (Dehedin et al ., ). In addition, the lack of a relationship between the feeding rate and glycogen body concentration observed for isopods fed with the two types of leaf of B. erecta also suggests strong differences between the energetic metabolism and investment strategy of A. aquaticus and the corresponding characteristics of the amphipod species.…”

Section: Discussionmentioning

confidence: 97%

“…The experiments were performed with sublethal concentrations of NH 3 (< 96 h LC 50 ), as previously established (Dehedin et al ., ). The nominal concentrations were prepared by dissolving the required amount of ammonium chloride (NH 4 Cl) in preestablished volumes of dechlorinated tap water for a final concentration of 0.5, 1, 1.5 and 2 mg NH 4 L −1 for the two Gammarus species and 1, 5, 10 and 15 mg NH 4 L −1 for A. aquaticus .…”

Section: Methodsmentioning

confidence: 97%

“…For example, Dehedin et al . () have clearly shown the impact of ammonia on the physiology and the survival rate of crustacean shredders. Moreover, ammonia frequently increases in wetlands during flow reduction or drought (Baron et al ., ; Dai et al ., ) because of the decrease in the available water volume and dissolved oxygen concentrations (Lefebvre et al ., ) and throughout the year in response to the agricultural practices in the surrounding areas (Piscart et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands

Dehédin

Maazouzi

Puijalon

et al. 2012

Global Change Biology

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In a global change context, the intensity and the frequency of drastic low flow periods or drought events will most likely increase to a substantial extent over the coming decades, leading to a modification in the abiotic characteristics of wetlands. This change in environmental parameters may induce severe shifts in plant and animal communities and the functioning of ecosystems. In this study, we experimentally estimated the effect of drought and the accumulation of ammonia (NH3 ) on the feeding activities of three generalist macroinvertebrates (i.e. Gammarus pulex, Gammarus roeselii and Asellus aquaticus) on three types of organic matter: leaves of Berula erecta growing in submerged conditions, leaves of the same species growing in emerged conditions and dead leaves of Alnus glutinosa. We observed a modification in the biomechanical and stoichiometric characteristics of the plants as a result of the emersion of the aquatic plants. This shift produced a substantial decrease in organic matter recycling by invertebrates and in their associated physiological ability (i.e. the energy stores of the animals) to face conditions associated with environmental change. Moreover, the accumulation of NH3 amplified the negative effect of emersion. This snowball effect on invertebrates may profoundly modify the functioning of ecosystems, particularly in terms of organic matter production/degradation and carbon mineralization.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands

Dehédin

Maazouzi

Puijalon

et al. 2012

Global Change Biology

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“…, Dehedin et al. ), we replenished deceased amphipods in all replicates during the first week. After that, dead amphipods were not replaced, but merely counted and removed from each mesocosm after 14, 21, and 28 d, at which point we counted all remaining amphipods in each mesocosm, preserved them in ethanol, dried them at 60°C to constant mass, and weighed them.…”

Section: Methodsmentioning

confidence: 99%

Species turnover and invasion of dominant freshwater invertebrates alter biodiversity–ecosystem‐function relationship

Little

Altermatt

2018

Ecological Monographs

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Freshwater ecosystems rely on allochthonous resources. Integration of these subsidies depends on diversity of both terrestrial resources and aquatic shredder and decomposer communities, but the diversity effects on leaf litter breakdown and decomposition are less clear in aquatic than terrestrial ecosystems. We need a better understanding of this relationship because aquatic communities are rapidly changing with species invasions and anthropogenic impacts. Here, we experimentally disentangled the effects of leaf and shredder richness on leaf litter breakdown by macroinvertebrates in mesocosm experiments using three species of amphipods, a dominant guild of crustaceans in European freshwater ecosystems. Increased leaf richness led to lower‐than‐predicted leaf consumption by native shredders, with mixed evidence of resource‐switching or prioritization of preferred food items within a leaf mix. Higher shredder species richness never promoted leaf consumption rates compared to predictions from relevant single‐species experiments, and instead sometimes substantially decreased leaf consumption. We then conducted a meta‐analysis of leaf litter consumption rates by seven widely distributed amphipod species (the three used in the experiments and four additional species). As expected based on our own experiments, nonnative amphipod species generally had lower biomass‐adjusted leaf litter consumption rates, although their larger body size led to higher per‐individual leaf consumption rates. Contamination of the water by metals, pesticides, and other chemicals additionally significantly decreased leaf litter consumption by multiple native and nonnative species compared to unpolluted systems. While the meta‐analysis suggested that litter consumption, and thus breakdown, would decline if native shredders are replaced by nonnative heterospecifics, complete species replacement is not the only outcome following immigration in a meta‐community context. Our experiments suggest that breakdown rates could remain reasonably high where native species coexist with nonnative arrivals. Experiments that neglect the ecological realism of species coexistence will necessarily mischaracterize effects on ecosystem functioning.

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“…[26] Ammonia contamination of surface water can occur via biodegradation of organic matter, agricultural run-off, animal farming, industrial wastes and urban sewage effluents. [27][28][29][30][31] High concentrations of ammonia in water can be detrimental to aquatic life, because most cellular membranes are permeable to ammonia. [32] The Ruiru River water appeared to be healthy with respect to ammonia contamination.…”

Section: Ammoniamentioning

confidence: 99%

Tropical surface water quality studies: Implications for the aquatic fate ofN-methyl carbamate pesticides

Zamini

Monn

et al. 2017

Journal of Environmental Science and Health, Part B

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Water quality assessment was conducted on the Ruiru River, a tributary of an important tropical river system in Kenya, to determine baseline river conditions for studies on the aquatic fate of N-methyl carbamate (NMC) pesticides. Measurements were taken at the end of the long rainy season in early June 2013. Concentrations of copper (0.21-1.51 ppm), nitrates (2.28-4.89 ppm) and phosphates (0.01-0.50 ppm) were detected at higher values than in uncontaminated waters, and attributed to surface runoff from agricultural activity in the surrounding area. Concentrations of dissolved oxygen (8-10 ppm), ammonia (0.02-0.22 ppm) and phenols (0.19-0.83 ppm) were found to lie within normal ranges. The Ruiru River was found to be slightly basic (pH 7.08-7.70) with a temperature of 17.8-21.2 C. The half-life values for hydrolysis of three NMC pesticides (carbofuran, carbaryl and propoxur) used in the area were measured under laboratory conditions, revealing that rates of decay were influenced by the electronic nature of the NMCs. The hydrolysis half-lives at pH 9 and 18 C decreased in the order carbofuran (57.8 h) > propoxur (38.5 h) > carbaryl (19.3 h). In general, a decrease in the electron density of the NMC aromatic ring increases the acidity of the N-bound proton removed in the rate-limiting step of the hydrolysis mechanism. Our results are consistent with this prediction, and the most electron-poor NMC (carbaryl) hydrolyzed fastest, while the most electron-rich NMC (carbofuran) hydrolyzed slowest. Results from this study should provide baseline data for future studies on NMC pesticide chemical fate in the Ruiru River and similar tropical water systems.

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Seasonal variations of the effect of temperature on lethal and sublethal toxicities of ammonia for three common freshwater shredders

Cited by 29 publications

References 30 publications

The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands

The combined effects of water level reduction and an increase in ammonia concentration on organic matter processing by key freshwater shredders in alluvial wetlands

Species turnover and invasion of dominant freshwater invertebrates alter biodiversity–ecosystem‐function relationship

Tropical surface water quality studies: Implications for the aquatic fate ofN-methyl carbamate pesticides

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