HOME >> BIOLOGY >> NEWS
Sediments in many Central Valley streams contain toxic levels of pyrethroid pesticides

elds. According to Weston, pyrethroid use in California increased 58 percent from 2001 to 2002, if account is taken of the increased potency of newer pyrethroids such as cypermethrin. Over a quarter of a million pounds of pyrethroids were spread on California farm fields in 2002, while about 500,000 pounds were used for structural and pest control and landscape maintenance.

Despite this increased use, environmental monitoring still concentrates on organophosphates, he said. Monitoring also tends to focus on concentrations in the water column, under the assumption that sediment-bound chemicals like pyrethroids are unavailable. The current study shows that to be untrue.

"It's amazing that, after 20 years of use, there is not one published study on pyrethroids in sediments in areas of intensive agriculture," Weston said.

Part of the reason for a lack of data is that analytical methods to detect pyrethroids in sediment have not been broadly available or standardized. Lydy, an environmental toxicologist with SIU-Carbondale's Illinois Fisheries and Aquaculture Center, developed such a method.

"Prior to our study, scientists in area water-monitoring programs were seeing that if they placed aquatic invertebrates in their sediment samples, the animals would die, but they didn't know why - they'd attribute it to organophosphates or organochlorines (two pesticide ingredients being phased out because of environmental concerns), or they'd put it down to 'unknown causes,'" Lydy said.

"Where our study is unique is that we looked at the toxicity and tried to figure out what was actually causing it. We detected organochlorines, such as DDT and chlordane, in the sediments, but at concentrations not high enough to cause the toxicity we noted, whereas concentrations of pyrethroids were high enough to account for that toxicity."

The samples, over 70 in all, were obtained from two major rivers - the San Joaquin and the Feather - and 19 cree
'"/>

Contact: Robert Sanders
rls@pa.urel.berkeley.edu
510-643-6998
University of California - Berkeley
6-May-2004


Page: 1 2 3 4 5

Related biology news :

1. Ocean Sediments Contain Record of Past Vegetation Fires in Africa
2. USAID, Conservation International & Starbucks launch Conservation Coffee Alliance in Central America
3. BioMed Central to consult funders and librarians over Open Access payment model
4. BioMed Central explodes Open Access myths
5. What remains to be discovered in Central American forests
6. The Scientist and BioMed Central come together to publish high-impact magazine
7. BioMed Central is pleased to announce the publication of Sydney Brenners autobiography
8. BioMed Central to deposit e-journals with the British Library
9. BioMed Central to consider charging authors for paper submissions
10. Get Research on the move with BioMed Central
11. Old Sins Industrial Metabolism, Heavy Metal Pollution, and Environmental Transition in Central Europe

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:2/6/2020)... ... February 06, 2020 , ... Kerafast Inc. , ... materials, today announced an agreement with The Good Food Institute , a ... Under the partnership, terrestrial meat and aquatic cell lines will be made available ...
(Date:1/30/2020)... (PRWEB) , ... January 30, 2020 , ... Accelera ... an eye on the Canadian market, is pleased to announce that the company has ... growth since the company launched in 2017. , “We are so thrilled to ...
(Date:1/28/2020)... PRUSSIA, Pa. and CAMBRIDGE, Mass. (PRWEB) , ... ... ... to solving complex problems for life sciences companies and government agencies, announced that ... life sciences hubs in the country. Tunnell’s Cambridge office will be in the ...
Breaking Biology News(10 mins):
(Date:1/27/2020)... ... 2020 , ... Cerebyte, the leader in “instant mentoring” solutions ... the availability of neuroscience of transformational leadership workshops. These highly interactive, hands-on workshops ... and change research to become great transformational leaders. The workshops are ...
(Date:1/24/2020)... ... January 24, 2020 , ... ... RedySmart™ mass flow meters and controllers ideal for BioPharm OEMS. ... upgrade to antiquated rotameters. These thermal instruments employ high-precision MEMS (Micro-Electro Mechanical Systems) ...
(Date:1/22/2020)... ... January 21, 2020 , ... COBO Technologies and Cardea ... The partners have agreed to co-develop and market a portfolio of CRISPR QC ... programs. Over the longer-term, the parties aim to develop a COBO branded QC ...
(Date:1/10/2020)... ... January 09, 2020 , ... GenScript ... inaugural GenScript Biotech Global Forum on Jan. 14 in San Francisco, coinciding with ... Gene Therapy and the Booming China Market," will feature gene and cell therapy ...
Breaking Biology Technology:
Cached News: