HOME >> BIOLOGY >> NEWS
Parasitic cowbirds thrive with a less ruthless strategy than cuckoos

Berkeley - America's brown-headed cowbird and the European cuckoo are the classic parasitic birds, laying their eggs in the nests of other bird species and leaving the chick-rearing to another parent.

But while a cuckoo hatchling thrives by muscling its host's eggs out of the nest and hogging all the food, a new study by biologists from the University of California, Berkeley, and the University of Cambridge in England shows that cowbird chicks survive with a less ruthless strategy.

A cowbird chick instead joins its nestmates in a chirping chorus that brings in more food than one noisy cowbird chick could demand from its host parents. By eating more than its share, the researchers found, the cowbird chick actually grows faster when sharing the nest and food with two host chicks than it does when all alone in the nest.

"The cowbird alone is incapable of bringing in enough parental resources - basically food - to be able to grow optimally," said Mark E. Hauber, a Miller Research Fellow in UC Berkeley's Museum of Vertebrate Zoology. "When it has nestmates, the whole nest brings in more parental care, because there is more begging altogether, and so the parents attend the nest more. But the cowbird monopolizes the feeding attempts by the parents. In these experiments, instead of getting 33 percent of the feedings that a brood of two host chicks and one cowbird chick gets, the cowbird actually got over 50 percent of the feeding. So, it grew better than when it was living alone."

Hauber, along with University of Cambridge biologists Rebecca M. Kilner and Joah R. Madden, published the findings in the August 6 issue of Science. Hauber will take a faculty position at the University of Auckland in New Zealand at the end of this year.

Though reviled by bird lovers, cowbirds have proved spectacularly successful, having expanded their range from the Midwest to the entire United States over the past 400 years. This is partly due to their p
'"/>

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


Page: 1 2 3 4

Related biology news :

1. Parasitic worms read the bodys immune condition and reproduce accordingly
2. HHMI To Award $14 Million In New International Program To Support Research On Infectious And Parasitic Diseases
3. Two Parasitic Wasps Show Promise For Controlling Pest Flies
4. Antarctic penguins thrive in ocean oases
5. Scientists decode genes of microbe that thrives in toxic metals
6. Bacteria may thrive in Antarctic lake
7. Meet the chemical that lets sea creatures thrive
8. Microbes in basalt thrive on mixed diet of toxic waste
9. Butterflies thrive in restored roadside prairies
10. A novel, safer strategy for regulating gene expression
11. New anti-inflammatory strategy for cancer therapy identified by UCSD researchers

Post Your Comments:
(Date:3/23/2015)... 2015  In the 2014 fiscal year, irs.gov recorded ... This figure accounts for a fraction of the estimated ... Report, exceeds $11 billion globally. The polygraph has traditionally ... has occurred. Investor Mark Saint Juste along ... Paolella partnered to administer the test in a ...
(Date:3/20/2015)... , Mar. 19, 2015 Research and Markets ... "Iris Biometrics - Global Strategic Business Report" report ... markets for Iris Biometrics in US$ Thousands. The report provides ... , Japan , Europe ... , and Latin America . ...
(Date:3/17/2015)... , March 17, 2015  MecklerMedia Corporation (OTCQX: ... exhibition for service robots ever held in ... place on May 11-13, 2015 at the Javits ... for the event include: Acorn Product Development; Axis ... Infranor; Kinova Robotics; Littler; NewBotic Corporation; Neya Systems ...
Breaking Biology News(10 mins):Polygraph Test Now Used to Protect Investors From Fraud 2Polygraph Test Now Used to Protect Investors From Fraud 3Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 2Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 3Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 4Iris Biometrics - Global Strategic Business Report 2015: System & Network Access Control - A Robust Market Opportunity in the Offing 5MecklerMedia's RoboUniverse New York Announces Sponsors and Exhibitors, May 11-13, 2015 2
(Date:3/25/2015)... London, UK (PRWEB) March 25, 2015 ... pervasive uptake of smartphones have fuelled social media ... population being currently engaged in social networking. Insurance ... exhaustively to communicate with clients and promote a ... the globe over are increasingly exploiting social networking ...
(Date:3/25/2015)... , March 25, 2015 Accelovance, a therapeutically ... finalist for "Best Contract Research Organization" at the upcoming ... Vaccine Congress. This is the eighth ... for the award, winning for "Best Contract Research Organization" ... Recommended" distinction in 2013. "We,re excited to ...
(Date:3/25/2015)... , March 25, 2015  Point-of-Care Partners, a ... consulting firm, has launched the ePrescribing State Law ... tracking of ePrescribing regulatory requirements in all 50 ... regulatory landscape continues to change rapidly, so we ... the industry, and ultimately patients, need," said ...
(Date:3/25/2015)... Researchers at Ancon Medical Inc. ... will enable broader and less invasive screening for ... simple breath screen. The Minnesota-based medical device maker ... Drug Administration (FDA) approval process and is targeting ... Biomarker Tagging device. , Ancon Medicals nanoparticle breakthrough ...
Breaking Biology Technology:Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 2Social Media Role in Global Insurance Industry Examined by Timetric in New Market Research Report Published at MarketPublishers.com 3Accelovance Nominated for 2015 Vaccine Industry Excellence (ViE) Awards 2Point-of-Care Partners Launches the ePrescribing State Law Capsule 2Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 2Ancon Medical Researchers Make Nanotechnology Breakthrough for Disease Screening Technology 3
Cached News: