PMID: 16629157Apr 25, 2006Paper

Evidence of pesticide impacts in the Santa Maria River watershed, California, USA

Environmental Toxicology and Chemistry
Brian S AndersonRon S Tjeerdema

Abstract

The Santa Maria River provides significant freshwater and coastal habitat in a semiarid region of central California, USA. We conducted a water and sediment quality assessment consisting of chemical analyses, toxicity tests, toxicity identification evaluations, and macroinvertebrate bioassessments of samples from six stations collected during four surveys conducted between July 2002 and May 2003. Santa Maria River water samples collected downstream of Orcutt Creek (Santa Maria, Santa Barbara County, CA, USA), which conveys agriculture drain water, were acutely toxic to cladocera (Ceriodaphnia dubia), as were samples from Orcutt Creek. Toxicity identification evaluations (TIEs) suggested that toxicity to C. dubia in Orcutt Creek and the Santa Maria River was due to chlorpyrifos. Sediments from these two stations also were acutely toxic to the amphipod Hyalella azteca, a resident invertebrate. The TIEs conducted on sediment suggested that toxicity to amphipods, in part, was due to organophosphate pesticides. Concentrations of chlorpyrifos in pore water sometimes exceeded the 10-d median lethal concentration for H. azteca. Additional TIE and chemical evidence suggested sediment toxicity also partly could be due to pyrethroid pesti...Continue Reading

Citations

Jan 28, 2014·Environmental Monitoring and Assessment·Brian AndersonRon Tjeerdema
Jun 6, 2009·Journal of Toxicology and Environmental Health. Part a·Qin-Li RuanDa-Yong Wang
Jun 23, 2009·Journal of Environmental Management·A PistocchiM Hauck
May 12, 2011·Environmental Toxicology and Chemistry·Amy L ForemanCristobal G dos Remedios
Feb 11, 2011·Environmental Toxicology and Chemistry·Brian AndersonRonald Tjeerdema
Mar 26, 2015·Environmental Science and Pollution Research International·Simone HasenbeinJuergen Geist
May 5, 2016·Environmental Toxicology and Chemistry·Brian S AndersonRonald Tjeerdema
Nov 16, 2017·Integrated Environmental Assessment and Management·Brian S AndersonRon S Tjeerdema
Jul 24, 2018·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Russel C G ChidyaHiroshi Sakugawa
Jun 25, 2008·Journal of Environmental Quality·David M Crohn, Mary L Bianchi
Oct 16, 2008·Environmental Science & Technology·Robert W HolmesValerie Connor
Dec 15, 2017·Environmental Science & Technology·Donald P WestonRichard E Connon

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