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Comparing the Impacts of Sediment-Spiked Cadmium on Chironomidae Larvae in Laboratory Bioassays and Field Microcosms and the Implications for Field Validation of Site-Specific Threshold Concentrations.
Liu, Zhihong; Zhang, Chi; Xin, Zhuohang; Tai, Peidong; Song, Changchun; Deng, Xin.
Afiliación
  • Liu Z; Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China.
  • Zhang C; Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China.
  • Xin Z; Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China.
  • Tai P; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
  • Song C; Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China.
  • Deng X; Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
Environ Toxicol Chem ; 40(9): 2450-2462, 2021 09.
Article en En | MEDLINE | ID: mdl-34037263
Information on the effects of pollutants in sediments at an ecosystem level to validate current and proposed risk-assessment procedures is scarce. The most frequent criticism of these procedures is that responses of surrogate species in the laboratory are not representative of responses of natural populations. A tiered approach using both laboratory and microcosm exposures (96-h and 21-d laboratory bioassays and a 3-mo field microcosm) was conducted to compare the impacts of sediment-spiked cadmium on the mortality, development, and abundance of Chironomidae larvae. The 96-h and 21-d lethal concentrations of sediment-spiked Cd to 50% of the species Chironomus riparius were estimated to be 201.07 and 172.66 mg/kg, respectively. In the 21-d laboratory bioassay, the endpoints, including the development rate and emergence ratio, were compared, and the lowest-observed-effect concentration (LOEC) values were 325.8 and 10.7 mg/kg, respectively. The abundance, richness, and biomass of field-collected larvae were compared among the different treatments in the field microcosm, and it was found that the order of sensitivities using different endpoints was biomass (2.6/5.2 mg/kg of no-observed-effect concentration/LOEC) > diversity (10.7/21.2 mg/kg) > abundance (41.2/82.7 mg/kg). The toxicity values based on lethal/sublethal changes in the laboratory bioassays might not fully protect field organisms against damage from chemicals, such as Cd, unless an assessment factor of 5 is used. These findings highlight the need to conduct field validation of criteria/guidelines before they are introduced to protect organisms/ecosystems in the field and provide a preliminary template for future field validation of criteria elsewhere. Environ Toxicol Chem 2021;40:2450-2462. © 2021 SETAC.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Chironomidae Tipo de estudio: Guideline / Risk_factors_studies Límite: Animals Idioma: En Revista: Environ Toxicol Chem Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Contaminantes Químicos del Agua / Chironomidae Tipo de estudio: Guideline / Risk_factors_studies Límite: Animals Idioma: En Revista: Environ Toxicol Chem Año: 2021 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos