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Title: Toxicity evaluation of natural samples from the vicinity of rice fields using two trophic levels
Author: Marques, Catarina R.
Pereira, Ruth
Gonçalves, Fernando
Keywords: Rice culture
Water and elutriates
Green algae
WET testing
Sub-lethal endpoints
Issue Date: Sep-2011
Publisher: Springer
Abstract: An ecotoxicological screening of environmental samples collected in the vicinity of rice fields followed a combination of physical and chemical measurements and chronic bioassays with two freshwater trophic levels (microalgae: Pseudokirchneriella subcapitata and Chlorella vulgaris; daphnids: Daphnia longispina and Daphnia magna). As so, water and sediment/soil elutriate samples were obtained from three sites: (1) in a canal reach crossing a protected wetland upstream, (2) in a canal reach surrounded by rice fields and (3) in a rice paddy. The sampling was performed before and during the rice culture. During the rice cropping, the whole system quality decreased comparatively to the situation before that period (e.g. nutrient overload, the presence of pesticides in elutriates from sites L2 and L3). This was reinforced by a significant inhibition of both microalgae growth, especially under elutriates. Contrary, the life-history traits of daphnids were significantly stimulated with increasing concentrations of water and elutriates, for both sampling periods.
Peer review: yes
DOI: 10.1007/s10661-010-1803-y
ISSN: 0167-6369
Appears in Collections:CESAM - Artigos
DBio - Artigos

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