Effects of the pyrethroid insecticide, cypermethrin, on a freshwater community studied under field conditions. I. Direct and indirect effects on abundance measures of organisms at different trophic levels

Friberg-Jensen, Ursula; Wendt-Rasch, Lina; Woin, Per; Christoffersen, Kirsten

doi:10.1016/s0166-445x(02)00201-1

Cited by 80 publications

(38 citation statements)

References 31 publications

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“…Although the compositional pattern of a phytoplankton community dominated by green algae was observed at both the reference and the impacted sites, shifts in the taxonomic composition of the communities were identified as a result of the different sensitivities of the four major taxonomic groups to the metal contamination. Such alterations in the productivity and structure of algal communities can be propagated in adverse effects on the structure and function of aquatic communities, through indirect cascading effects on higher trophic levels (e.g., by disrupting the function of primary producers, changing the food edibility, or altering physicochemical conditions) [8,51,52].…”

Section: Chlorella Vulgarismentioning

confidence: 99%

An in situ toxicity assay with the local phytoplankton community

Moreira‐Santos

Antunes

Gonçalves

et al. 2010

Enviro Toxic and Chemistry

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The present study describes an approach for toxicity estimates based on the in situ exposure of the local phytoplankton community immobilized in calcium-alginate beads. The assay was deployed in an acid mine drainage-impacted system, at a reference site and an impacted site. Abundances and growth rates of major taxonomic groups (green algae, flagellates, diatoms, and cyanobacteria) and of the entire community were measured. The ecological relevance of classical toxicity estimates was evaluated by performing in situ and laboratory assays with the standard species Pseudokirchneriella subcapitata and Chlorella vulgaris. Site waters were tested without and with nutrient enrichment, to discriminate toxic effects from those caused by nutrient limitations. Despite the occurrence of growth-limiting conditions for the local phytoplankton within the alginate matrix, an impact of the mine effluent on the community was detected. The growth of the community and of all taxonomic groups, except for the cyanobacteria, was less at the impacted site than at the reference site, although adding nutrients partially compensated for the effluent detrimental effects. Shifts in the community structure were also provoked by the mine effluent; decreases in the abundance of green algae were paralleled by increases in the abundance of flagellates and diatoms, but mainly of cyanobacteria. Effects on the growth of both standard species of green algae were in conformity with those on the local phytoplankton, probably because the latter was dominated by green algae. Although future improvements regarding the cell immobilization technique should be attempted, the proposed easy and inexpensive approach to assess both the growth and the structure of local phytoplankton communities will allow more environmentally realistic site-specific assessments of water quality.

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Section: Chlorella Vulgarismentioning

confidence: 99%

An in situ toxicity assay with the local phytoplankton community

Moreira‐Santos

Antunes

Gonçalves

et al. 2010

Enviro Toxic and Chemistry

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“…[2] Among the group of pyrethroids, cypermethrin [R) − α-cyano-3-phenoxybenzyl (1S)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate] was introduced in the late 1970s and has since then been used on a wide range of crops, due to its high pesticide activity. [3] In recent years cypermethrin has been commonly used to control wohlfahrtiosis in sheep [4] and several insect pests of cotton. [5−8] The textile industry is one of the largest industrial producers of contaminated wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Adsorption behavior of α -cypermethrin on cork and activated carbon

Domingues

Priolo²,

Alves

et al. 2007

Journal of Environmental Science and Health, Part B

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Studies were undertaken to determine the adsorption behavior of α-cypermethrin [R)-α-cyano-3-phenoxybenzyl(1S)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate, and (S)-α-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate] in solutions on granules of cork and activated carbon (GAC). The adsorption studies were carried out using a batch equilibrium technique. A gas chromatograph with an electron capture detector (GC-ECD) was used to analyze α-cypermethrin after solid phase extraction with C18 disks. Physical properties including real density, pore volume, surface area and pore diameter of cork were evaluated by mercury porosimetry. Characterization of cork particles showed variations thereby indicating the highly heterogeneous structure of the material. The average surface area of cork particles was lower than that of GAC. Kinetics adsorption studies allowed the determination of the equilibrium time-24 hours for both cork (1-2 mm and 3-4 mm) and GAC. For the studied α-cypermethrin concentration range, GAC revealed to be a better sorbent. However, adsorption parameters for equilibrium concentrations, obtained through the Langmuir and Freundlich models, showed that granulated cork 1-2 mm have the maximum amount of adsorbed α-cypermethrin (q m ) (303 μg/g); followed by GAC (186 μg/g) and cork 3-4 mm (136 μg/g). The standard deviation (SD) values, demonstrate that Freundlich model better describes the α-cypermethrin adsorption phenomena on GAC, while α-cypermethrin adsorption on cork (1-2 mm and 3-4 mm) is better described by the Langmuir. In view of the adsorption results obtained in this study it appears that granulated cork may be a better and a cheaper alternative to GAC for removing α-cypermethrin from water.

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“…Therefore, being able to test the acute toxicity of chemicals on response variables that are sensitive to sublethal concentrations is desirable. This applies especially to pesticides such as the pyrethroids, which typically induce a rapid onset of poisoning symptoms but only persist for a short time in the water column because of adsorption by organic matter and degradation [8].The purpose of our study has been to test by continuous video recording how cypermethrin and azoxystrobin affect several physiological parameters of single tethered Daphnia magna during 24 h.The physiological responses of the heart, the filtering limbs, the mandibles, and the focal spine were analyzed. Proper functioning of these parameters is essential for normal existence of the animal, because they are involved in blood circulation, gas exchange, and the filtration and processing of food [9][10][11].…”

mentioning

confidence: 99%

Early signs of lethal effects in Daphnia magna (Branchiopoda, Cladocera) exposed to the insecticide cypermethrin and the fungicide azoxystrobin

Friberg-Jensen

Nachman

Christoffersen

2010

Enviro Toxic and Chemistry

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This study presents the effects of sublethal concentrations of pesticides cypermethrin and azoxystrobin on the activity of several physiological parameters of egg-carrying Daphnia magna studied using a video-image technique. Single tethered daphnids were continuously recorded for 24 h of pesticide exposure, and the activity of the heart, the filtering limbs, the mandibles, and the focal spine were subsequently analyzed. Acute toxicity tests based on the criteria of immobilization were performed on egg-carrying D. magna, and sublethal concentrations of 0.1, 1.0, and 10 µg/L cypermethrin and 0.5, 1.0, and 2.0 mg/L azoxystrobin were established. At a concentration as low as 0.1 µg/L cypermethrin, the 5% effective concentration after 24 h of exposure (EC5,24h), the activity of the focal spine increased and the filtering limb activity decreased. The activity of the mandibles was reduced by exposure to 1.0 (EC18,24 h) and 10 µg/L (EC41,24 h) cypermethrin, whereas heart activity increased at a concentration of 10 µg/L (EC41,24 h). With regard to azoxystrobin, the activity of all response parameters except the focal spine decreased by exposure to 0.5 mg/L (EC4,24h) azoxystrobin. The focal spine was not affected by azoxystrobin. The results show that physiological mechanisms important for ingestion of food in D. magna may be impaired by low concentrations of commonly used pesticides.

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Effects of the pyrethroid insecticide, cypermethrin, on a freshwater community studied under field conditions. I. Direct and indirect effects on abundance measures of organisms at different trophic levels

Cited by 80 publications

References 31 publications

An in situ toxicity assay with the local phytoplankton community

An in situ toxicity assay with the local phytoplankton community

Adsorption behavior of α -cypermethrin on cork and activated carbon

Early signs of lethal effects in Daphnia magna (Branchiopoda, Cladocera) exposed to the insecticide cypermethrin and the fungicide azoxystrobin

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