Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Shedding feathers early may enhance sex appeal, new songbird study shows

27.12.2004


Birds that migrate early in the season may have a distinct advantage when it comes to attracting the opposite sex, say researchers from Queen’s University and the Smithsonian Institution.



And it’s all about the feathers.

Researchers were surprised to discover that the timing of a male songbird’s reproduction cycle affects the colour of his feathers and may have important implications for his success in attracting mates. When migratory songbirds raise their young extremely late in the summer, many don’t have time to molt (shed their feathers and replace with new growth) before heading south, the new study shows.


"This means they must molt at stopover sites on their journey to tropical winter habitats," explains Ryan Norris, who conducted the research as part of his PhD in biology at Queen’s, supervised by Professors Laurene Ratcliffe (Queen’s Biology) and Peter Marra (Smithsonian Environmental Research Center).

"Their replacement feathers, grown en route, are less colourful than those of birds that had time to molt before migration, which may put them at a disadvantage in attracting females the following breeding season," says Dr. Norris. "Both findings – that molting in some songbirds occurs after migration has begun, and that their new feathers are duller in colour – were surprising."

The study will be published Dec. 24 in the journal Science.

Until now scientists have assumed that most species of migratory birds molt before they migrate. The team discovered that in fact some begin their migration, molt at a "stopover" site, then continue to their winter habitat. Forty per cent of the male American Redstarts in the study molted in their tail feathers at areas up to 2000 kilometers south of their breeding grounds.

By measuring stable hydrogen isotopes in the newly grown feathers when birds returned the following spring to breed at the Queen’s University Biology Station north of Kingston, the researchers were able to determine the approximate region where molting had occurred. And when the feathers were analyzed with a spectrometer measuring how much light of different wavelengths is reflected, significant differences in colour were also detected.

A key indicator of the songbirds’ health and quality is the concentration of carotenoid in the feathers, which causes orange-red light to be reflected in their feathers. Physiological stress during molting can reduce carotenoid deposits in the feathers.

"Studies of other bird species have shown that females prefer males with higher concentrations of carotenoids, and thus brighter, more intense colours," says Queen’s biologist Bob Montgomerie, who did the colour analysis of feathers for this project. "What we didn’t know until now is that birds’ colours in any given year may be affected by what happened to them in the previous breeding season.

"That’s exciting because ’cost of reproduction’ is a general, organism-wide problem of many species, not just birds."

The other member of the research team from Queen’s is geology professor Kurt Kyser, director of the university’s Facility for Isotope Research, where the stable isotope measurements were conducted.

Nancy Dorrance | EurekAlert!
Further information:
http://www.queensu.ca

More articles from Studies and Analyses:

nachricht Win-win strategies for climate and food security
02.10.2017 | International Institute for Applied Systems Analysis (IIASA)

nachricht The personality factor: How to foster the sharing of research data
06.09.2017 | ZBW – Leibniz-Informationszentrum Wirtschaft

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Ocean atmosphere rife with microbes

17.10.2017 | Life Sciences

Neutrons observe vitamin B6-dependent enzyme activity useful for drug development

17.10.2017 | Life Sciences

NASA finds newly formed tropical storm lan over open waters

17.10.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>