Navigation Links
Bird brains shrink from exposure to contaminants

The regions in robins' brains responsible for singing and mating are shrinking when exposed to high levels of DDT, says new University of Alberta research--the first proof that natural exposure to a contaminant damages the brain of a wild animal.

"These residues have been persisting since the late 1960s--that's what is really disturbing," said Dr. Andrew Iwaniuk, a post-doctoral research fellow in the U of A's Department of Psychology. "It has been years since it has been used and still has this effect."

The new research, published in Behavioural Brain Research, strongly suggests that exposure to environmental levels of DDT causes significant changes in the brains of songbirds.

Previous studies have suggested that exposure to DDT residues affect the brain, but none have actually demonstrated it. The research team, including Iwaniuk's supervisor, psychology professor and Tier II Canada Research Chair Douglas Wong-Wylie, used American Robins to test the idea. Birds are more susceptible to the effects of pesticide residues and other contaminants in the environment than other animals. As well, American robins are often exposed to high levels of DDT and other chemicals because they rely heavily on earthworms as part of their diet. They specifically chose these birds in the Okanagan Valley because at that location they are exposed to high levels of DDT, but relatively low levels of other chemicals.

The researchers captured 18 nestlings and then hand-reared and observed them for two years. They then sectioned the brains and examined the size of several brain regions. "We found that the regions sensitive to reproductive hormones--song production and courtship behaviour--were most affected by DDT," said Iwaniuk. "Song production is extremely important in attracting a mate or to mark out a territory.

"The issue is not that DDT is killing these robins but if they are growing up in this one area and then move to another, they won't b
'"/>

Source:University of Alberta


Page: 1 2

Related biology news :

1. Birds brains reveal source of songs
2. Supercomputers to focus brains on AIDS dilemma
3. Mice brains shrink during winter, impairing some learning and memory
4. Divergent life history shapes gene expression in brains of salmon
5. Jumping genes contribute to the uniqueness of individual brains
6. Experts discuss use of human stem cells in ape and monkey brains
7. Sharp older brains are not the same as younger brains
8. Animal brains hard-wired to recognize predators foot movements, Queens study suggests
9. Carnegie Mellon researchers discover key deficiencies in brains of people with autism
10. Gene therapy injected into the brains of mice with Huntingtons disease
11. Scientists identify 36 genes, 100 neuropeptides in honey bee brains
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Bird brains shrink from exposure contaminants

(Date:8/21/2014)... A study recently published in the journal ... shows a new role for the protein adenomatous polyposis ... cause of cancer-related deaths in the U.S. , Lead ... Molecular Biosciences and co-leader of the Cancer Biology program ... part of her career trying to understand the various ...
(Date:8/21/2014)... An Australian National University (ANU) team has successfully replicated ... way for biological systems powered by sunlight which could ... and so is sunlight. It is an exciting prospect ... cheaply and safely," said Dr Kastoori Hingorani, from the ... ANU Research School of Biology. , Hydrogen offers potential ...
(Date:8/20/2014)... 2014 George E. Fox, a John and Rebecca Moores ... (UH), was named a fellow in the International Society for ... Fox is one of four members two from the ... as fellows in 2014. Fellows are elected every three years, ... 500 members from more than 20 countries, the ISSOL includes ...
Breaking Biology News(10 mins):Research offers insight into cellular biology of colorectal cancer 2Research offers insight into cellular biology of colorectal cancer 3Water and sunlight the formula for sustainable fuel 2UH professor named fellow by International Astrobiology Society 2
... If something moves where you plan to place your foot ... swinging through. Experts thought previously that if nothing changed in ... your foot will land is fixed before it even leaves ... of immediate visual information during each step. , Researchers monitored ...
... Breeding rice with higher levels of iron can have ... a new study in the Journal of Nutrition. The ... United States, is a major step forward in the ... most debilitating and intractable public health problems affecting nearly ...
... semiconductor crystals, biological probes and a laser, Johns Hopkins ... specific sequences of DNA by making them light up ... the technique will have important uses in medical research, ... sample of DNA containing a mutation linked to ovarian ...
Cached Biology News:Study finds that nutritionally enhanced rice reduces iron deficiency 2Study finds that nutritionally enhanced rice reduces iron deficiency 3New nanosensor uses quantum dots to detect DNA 2
(Date:8/21/2014)... , Aug. 21, 2014 OTC ... Pharmaceuticals Inc., a biotechnology company, on its approval ... previously traded on OTCQX®, the best marketplace for ... Markets Group. Logo - http://photos.prnewswire.com/prnh/20110118/MM31963LOGO ... the successful execution of its growth strategy and ...
(Date:8/21/2014)... 2014 Pursuit Solutions ( http://www.pursuit-solutions.com ... and services for Life Sciences sales and marketing ... of New Commercial Sales Models” by Peter Robinson, ... The article examines some innovative models used to ... tested in the pharmaceutical market. Robinson grades the ...
(Date:8/21/2014)... Boston, MA (PRWEB) August 21, 2014 ... collaboration company, has been recognized as one of ... 500 | 5000 magazine for the 2nd consecutive ... on its 33rd annual Inc. 500|5000, an exclusive ... list represents the most comprehensive look at the ...
(Date:8/20/2014)... patented university inventions licensed to biotechnology firms has ... To open these roadblocks, the researchers suggest that ... discovery stage could lead to faster commercialization down ... from discoveries made in university laboratories and licensed ... clinical trials, which have a high failure rate. ...
Breaking Biology Technology:OTC Markets Group Congratulates Immune Pharmaceuticals on NASDAQ Listing 2Pursuit's Peter Robinson Publishes "Grading Pharma's Use of New Commercial Sales Models" 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 2SoundConnect Returns on Inc. 5000 List of Fastest Growing Companies 3Early bottlenecks in developing biopharmaceutical products delay commercialization 2Early bottlenecks in developing biopharmaceutical products delay commercialization 3
... Argenta Advisors(TM), a leading,national life science reimbursement ... joined the team as a medical director for ... leadership of Chief Medical Officer Dr. Brent,O,Connell, guides ... review and payer coverage. Argenta TEC facilitates the,coverage ...
... Its Kind Instant Dissolve Powder Antacid Delivers Faster Relief, ... Increased Convenience and Great Taste, ... a $20 million integrated marketing campaign,for the new TUMS(R) QuikPak(TM), ... TUMS brand. The QuikPak campaign, part of,a larger new "Bring ...
... NVAX ) a clinical-stage vaccine company, announced today that ... presenting at,the World Vaccine Congress 2008 at 11:25 a.m. ... provide an overview of the company,s,strategy, research and development ... Finalist for the Vaccine Industry,Excellence (VIE) Awards 2008 in ...
Cached Biology Technology:Dr. Elizabeth Brown Joins Argenta TEC 2New TUMS(R) QuikPak(TM) Campaign Offers Innovative Heartburn Relief with a Little Help from the Jetsons 2
Ready-to-use solution....
Applications: ISH...
TRIzol Reagents are ready-to-use monophasic solutions of phenol and guanidine isothiocyanate suitable for isolating total RNA DNA and proteins (16)....
Anti-ZFP-38/RU49 Family: Zinc Finger Peptide Sequence: SVKVEDKDFPSTCSKK...
Biology Products: