Navigation Links
American birds of prey at higher risk of poisoning from pest control chemicals
Date:3/10/2011

A new study by scientists from Maryland and Colorado using American kestrels, a surrogate test species for raptorial birds, suggests that they are at greater risk from poisoning from the rodenticide diphacinone than previous believed. The research, published in Environmental Toxicology and Chemistry, considers the threat posed by diphacinone as its usage increases following restrictions on the use of similar pesticides.

"Recent restrictions on the use of some rodenticides may result in increased use of diphacinone," said lead author Dr. Barnett Rattner from the US Geological Survey. "Very few controlled studies have examined its toxicity in birds so it is important to determine how lethal this chemical is to wildlife."

Surveillance programs have reported detection of rates of rodenticide in birds of prey across France, Great Britain and Western Canada, revealing that several second-generation rodenticides can result in non-target deaths, with possible population-level implications.

However, the global magnitude of non-target poisoning through the routine use of rodenticide, or through targeted eradication programs remains unknown, partly because the indirect fatalities go largely unnoticed and unreported.

The team tested kestrels and discovered the effects of diphacinone and the quantity required for a lethal dose. The results showed that birds that had ingested greater than 300 mg per kilogram of body weight died within 8 to 23 hours, while those ingesting a dose of 118.6 mg/kg survived 27 to 47 hours. At lower doses, nearly all of the birds survived.

Poisoned birds displayed some evidence of internal bleeding, although histological examination of internal organs revealed hemorrhaging over a wide range of doses. The results demonstrate that doses that reach or exceed 79 mg/kg body weight are lethal for kestrels.

"Our study, combined with previous research in hawk and owl species show that birds of prey are considerably more sensitive to diphacinone compared to species such as bobwhite quails and mallards," said Rattner. "Their protection requires more substantial safety margins than are afforded to species of game birds traditionally used in pesticide registration studies."

Using their results the team estimated how much poisoned prey a hawk or owl would need to consume before ingesting a lethal dose. Using a probabilistic risk approach, the team estimated that an endangered hawk or owl would be at risk if it consumed as little as 3 to 4 grams of liver from a poisoned rodent.

"Diphacinone was found to be considerably more toxic to American kestrels than previously reported in tests of other wildlife test species", concluded Rattner. "These data, in combination with similar measurements in Northern bobwhites, will assist in the development of a pharmacodynamic model and a more complete risk assessment of diphacinone for birds."


'/>"/>

Contact: Ben Norman
Lifesciencenews@wiley.com
44-012-437-70375
Wiley-Blackwell
Source:Eurekalert

Related biology news :

1. American Chemical Society National Meeting & Exposition, March 27-31, Anaheim, Calif.
2. Tips from the journals of the American Society for Microbiology
3. Why are vines overtaking the American tropics?
4. American Physical Society online journals available free in US high schools
5. Native American ancestry linked to greater risk of relapse in young leukemia patients
6. ASN statement in support of US Dietary Guidelines for Americans 2010
7. Altered gene protects some African-Americans from coronary artery disease
8. University of Missouri professor elected to American Association for the Advancement of Science
9. 10 UC Riverside researchers recognized by the American Association for the Advancement of Science
10. Press registration opens for American Chemical Society National Meeting, March 27-31, 2011
11. American Association of Anatomists announces young investigator award winners
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/10/2016)... -- --> --> ... Access Management Market by Component (Provisioning, Directory Services, Password ... Size, by Deployment, by Vertical, and by Region - ... is estimated to grow from USD 7.20 Billion in ... Compound Annual Growth Rate (CAGR) of 12.2% during the ...
(Date:3/8/2016)... 8, 2016   Valencell , the leading ... it has secured $11M in Series D financing. ... new venture fund being launched by UAE-based financial ... existing investors TDF Ventures and WSJ Joshua Fund. ... its triple-digit growth and accelerate its pioneering innovation ...
(Date:3/2/2016)... 2016 http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) ... "Global Biometrics as a Service Market 2016-2020" ... --> http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced the ... a Service Market 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/cmt3hk/global_biometrics ) has announced ...
Breaking Biology News(10 mins):
(Date:5/3/2016)... ... May 03, 2016 , ... Leading CEOs from biotech, pharmaceutical, ... and June 1st at The Four Seasons Hotel Boston. , The Boston CEO ... offering exclusive access to key decision makers who influence deal making and investment. ...
(Date:5/3/2016)... - And Other Rising Companies ... Those Competitor Biologics  - Biosimilar Drug Producers ... ,  Who are the most important and ... their sales potentials? Discover, in our updated survey, organisations, ... and revenue forecasting. Visiongain,s new ...
(Date:5/2/2016)... , May 2, 2016 Q ... its technology partner Mannin Research Inc. will be attending ... which takes place from May 1-5, 2016 in ... be meeting with its vendors and research partners. The ... development goals and other collaborative opportunities for the MAN-01 ...
(Date:4/29/2016)... ... ... The MIT bioLogic design team has won multiple A' Design Awards ... applied to fabric and formed into living interfaces between body and environment. They found ... team harvested Natto cells and applied them to fabric with custom 3D printers.The cell-infused ...
Breaking Biology Technology: