title: Ecological effects of the herbicide linuron in tropical freshwater microcosms.
abstract: Effects of a single application of the photosynthesis-inhibiting herbicide linuron (0, 15, 50, 150, and 500 microg/L) on the ecology of outdoor plankton-dominated microcosms were studied in Thailand. As a result of the decreased photosynthesis, DO and pH decreased while EC, alkalinity and nutrient concentrations increased. Chlorophytes belonging to the genera Scenedesmus, Coelastrum and Pediastrum were the most sensitive taxa, whereas several other chlorophytes, diatoms, and cryptophytes increased in abundance. Tolerant taxa appeared to be less digestable for several zooplankton taxa, which subsequently decreased in abundances. Chamaesiphon sp. (Cyanobacteria) was the most susceptible periphyton species. As a consequence of functional redundancy, effects of the herbicide on the chlorophyll-a content of periphyton and especially phytoplankton did not always reflect the effects noted on community level.
authors: CESAM, Department of Biology, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal. michieldaam@gmail.com
authors: Michiel A
authors: MA
authors: Daam
authors: António M F
authors: AM
authors: Rodrigues
authors: Paul J
authors: PJ
authors: Van den Brink
authors: António J A
authors: AJ
authors: Nogueira
mesh_terms: D000818:Animals; D000458:Cyanobacteria; D017753:Ecosystem; D005618:Fresh Water; D006540:Herbicides / Q000378:metabolism / Q000633:toxicity*; D006863:Hydrogen-Ion Concentration; D008044:Linuron / Q000378:metabolism / Q000633:toxicity*; D010788:Photosynthesis; D010839:Phytoplankton / Q000187:drug effects* / Q000378:metabolism; D018570:Risk Assessment; D044444:Scenedesmus; D013785:Thailand; D014329:Tropical Climate; D014874:Water Pollutants, Chemical / Q000378:metabolism / Q000633:toxicity*; D015048:Zooplankton / Q000187:drug effects* / Q000378:metabolism
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D008044:Linuron