Navigation Links
Even at sublethal levels, pesticides may slow the recovery of wild salmon populations
Date:12/16/2009

Biologists determined that short-term, seasonal exposure to pesticides in rivers and basins may limit the growth and size of wild salmon populations. In addition to the widespread deterioration of salmon habitats, these findings suggest that exposure to commonly used pesticides may further inhibit the recovery of threatened or endangered populations.

"Major efforts are currently underway to restore Pacific salmon habitats in an effort to recover depressed populations," says David Baldwin of the National Oceanic and Atmospheric Administration (NOAA), who co-authored the study with NOAA colleagues in the December issue of the ESA journal Ecological Applications. "However, not much research has been done to determine the importance of pollution as a limiting factor of ESA-listed species."

The researchers studied the impact of pesticides, such as diazinon and malathion, on individual salmon using pre-existing data, and then devised a model to calculate the productivity and growth rate of the population. They used several exposure scenarios to reflect realistic pesticide use across various landscapes and over time.

Pesticides include insecticides, herbicides and fungicides that are usually applied to agricultural and urban landscapes. They primarily enter waterways in spray drift, surface runoff and irrigation return flows.

"An important aim of the work was to link known sublethal effects for individual salmon to impacts on the productivity of salmon populations," explains Baldwin.

The biologists found in previous studies that, on an individual level, the pesticides directly affected the activity of acetylcholinesterase, an important enzyme in the salmon brain. As a result, the salmon experienced reductions in feeding behavior. The reductions in food were then extended using the model to calculate reductions in the growth, size, and subsequent survival at ocean migration. In one scenario, the model predicted that, within a span of 20 years, returning spawners would have an increase of 68 percent abundance compared to a 523 percent projected increase in an unexposed chinook population.

"The model showed that a pesticide exposure lasting only four days can change the freshwater growth and, by extension, the subsequent survival of subyearling animals," says Baldwin. "In addition, the seasonal transport of pesticides to salmon habitats over successive years might slow the recovery of depressed populations."

The researchers argue that improving water quality conditions by reducing common pollutants could potentially increase the rate of recovery. Looking to the bigger picture, "This should help resource managers consider pesticides at the same biological scale as physical and biological stressors when prioritizing habitat restoration activities," says Baldwin.


'/>"/>

Contact: Nadine Lymn
nadine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

Related biology news :

1. Gray whales a fraction of historic levels, genetic research says
2. Folic acid lowers blood arsenic levels, according to Mailman School of Public Health study
3. New genetic variants associated with lipid levels, risk for coronary artery disease
4. Alternative methods proposed to detect pesticides and antibiotics in water and natural food
5. Satellites help ensure efficient use of pesticides
6. Pesticides persist in ground water
7. Pitt research finds that low concentrations of pesticides can become toxic mixture
8. Parasite-resistant peppers green alternatives to chemical pesticides
9. Pesticides -- easier detection of pollution and impact in rivers
10. Survey finds elevated rates of new asthma among WTC rescue and recovery workers
11. New study shows greenback cutthroat trout involved in recovery effort misidentified
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/29/2017)...  higi, the health IT company that operates the ... , today announced a Series B investment from ... The new investment and acquisition accelerates higi,s strategy to ... population health activities through the collection and workflow integration ... collects and secures data today on behalf of over ...
(Date:3/23/2017)... 23, 2017 The report "Gesture Recognition and Touchless Sensing ... Geography - Global Forecast to 2022", published by MarketsandMarkets, the market is expected ... 29.63% between 2017 and 2022. Continue Reading ... ... ...
(Date:3/20/2017)... At this year,s CeBIT Chancellor Dr. Angela Merkel visited the ... the DERMALOG stand together with the Japanese Prime Minster Shinzo Abe. ... largest German biometrics company the two government leaders could see the three ... as DERMALOG´s multi-biometrics system.   Continue Reading ... ...
Breaking Biology News(10 mins):
(Date:4/21/2017)... , ... April 21, 2017 , ... ... dedicated to nourishing a range of emerging technology-based businesses, recently earned a $77,518 ... Court location. , Founded in 2004, FITCI is Frederick’s first incubator. A ...
(Date:4/20/2017)... TX; Ultrecht, Netherlands (PRWEB) , ... April 20, ... ... Qafis Biometrics Technology today announced their strategic partnership to offer a full ... digital identity authentication, a comprehensive suite of biometric products and the ground-breaking proactive ...
(Date:4/20/2017)... ... April 20, 2017 , ... USDM Life Sciences , the ... and healthcare industries, is pleased to announce Holger Braemer as Vice President ... Europe GmbH” based in Germany. , Braemer is an integral part of USDM’s ...
(Date:4/20/2017)... ... 20, 2017 , ... NetDimensions appoints Bill Mastin, a learning technology veteran, as ... experience in the learning technologies industry, Mastin joins NetDimensions from the New York office ... (LTG). At LEO, Mastin served as SVP of the North America offices and prior ...
Breaking Biology Technology: