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:8/1/2014)... at The Scripps Research Institute (TSRI) have identified a ... in brown fat cells. , The study, which ... the Proceedings of the National Academy of Sciences ... fat thermogenesis," which is of great interest to medical ... also protect against diabetes. , "This finding offers new ...
(Date:7/31/2014)... In the United States, natural-gas production from shale ... since 2007. Yet scientists still do not fully ... according to a report in the journal ... As gas extraction continues to vastly outpace scientific ... various organizations and institutions, including Princeton University, concluded ...
(Date:7/31/2014)... Fla. --- By tracing nearly 3,000 genes to ... University of Florida scientists have created an extensive ... use large-scale, next-generation DNA sequencing. , Among ... closely related to small moths than to large ... butterflies evolved. The study also found that some ...
Breaking Biology News(10 mins):Scripps Research Institute scientists find new calorie-burning switch in brown fat 2Scripps Research Institute scientists find new calorie-burning switch in brown fat 3'Fracking' in the dark: Biological fallout of shale-gas production still largely unknown 2'Fracking' in the dark: Biological fallout of shale-gas production still largely unknown 3UF study advances 'DNA revolution,' tells butterflies' evolutionary history 2UF study advances 'DNA revolution,' tells butterflies' evolutionary history 3
(Date:8/1/2014)... Corporation (NYSE: CBM ) reports results for the ... , Second quarter sales increased 59% to $98.0 ... , Second quarter EBITDA increased 86% to $21.2 million ... (see table at the end of this release). , ... foreign currency, to between 13% and 16% over 2013, and ...
(Date:7/31/2014)... Dallas, Texas (PRWEB) August 01, 2014 ... Global and China Polyurethane Resin Industry” is ... Polyurethane Resin market. The report introduces Polyurethane ... application, and industry chain structure and industry ... analysis, including China’s domestic market as well ...
(Date:7/31/2014)... the British mathematician (1912-1954), is famous for a number ... century. In 1936 he published a paper, which laid ... concept of a computer algorithm. He next played a ... machines which cracked the German military codes, enabling the ... And in the late 1940,s he turned his attention ...
(Date:7/31/2014)... , July 31, 2014 The ... today with $25,000 to fund a translational research ... in 2011, the gift was presented at the ... Annual Meeting in Colorado Springs, CO. ... in neurointerventional approaches to neurovascular conditions, SNIS formed ...
Breaking Biology Technology:Cambrex Reports Second Quarter 2014 Financial Results 2Cambrex Reports Second Quarter 2014 Financial Results 3Cambrex Reports Second Quarter 2014 Financial Results 4Cambrex Reports Second Quarter 2014 Financial Results 5Cambrex Reports Second Quarter 2014 Financial Results 6Cambrex Reports Second Quarter 2014 Financial Results 7Cambrex Reports Second Quarter 2014 Financial Results 8Cambrex Reports Second Quarter 2014 Financial Results 9Cambrex Reports Second Quarter 2014 Financial Results 10Cambrex Reports Second Quarter 2014 Financial Results 11Cambrex Reports Second Quarter 2014 Financial Results 12Cambrex Reports Second Quarter 2014 Financial Results 13Cambrex Reports Second Quarter 2014 Financial Results 14Cambrex Reports Second Quarter 2014 Financial Results 15Cambrex Reports Second Quarter 2014 Financial Results 16Polyurethane Resin Industry & Thermoplastic Polyurethane Market (China, Global) Analysis Now at DeepResearchReports.com 2Polyurethane Resin Industry & Thermoplastic Polyurethane Market (China, Global) Analysis Now at DeepResearchReports.com 3Polyurethane Resin Industry & Thermoplastic Polyurethane Market (China, Global) Analysis Now at DeepResearchReports.com 4A mathematical theory proposed by Alan Turing in 1952 can explain the formation of fingers 2A mathematical theory proposed by Alan Turing in 1952 can explain the formation of fingers 3SNIS Foundation Bestows First Grant Award For Cutting-Edge NeuroInterventional Research 2SNIS Foundation Bestows First Grant Award For Cutting-Edge NeuroInterventional Research 3
Cached News: