Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Getting their own back on cuckoos: Australian fairy-wrens have the last laugh

19.03.2003


A team of scientists from Cambridge University and Bristol University, led by Dr Naomi Langmore of the Australian National University, has found that some Australian birds are one step ahead of their British counterparts in their ability to avoid being victimized by cuckoos.



Cuckoos exploit other bird species by laying their eggs in the nests of other birds. Soon after hatching, the cuckoo chick kills host young by tipping them out of the nest. The foster parents then work hard to rear the imposter in their nest, for which they gain no genetic reward.

Not surprisingly, host species go to great lengths to avoid being exploited. British hosts of the common cuckoo, such as reed warblers, are extremely good at spotting odd-looking eggs laid in their nest, which they quickly remove. In response, cuckoos have evolved mimetic eggs that closely resemble host eggs, and so have a higher chance of being unnoticed. However, despite their fine egg recognition skills, British hosts persist in feeding the cuckoo chick even though it looks utterly unlike their own young and can be six times bigger than the adults feeding it.


Now it seems that the superb fairy-wren, which is host to Australia’s Horsfield’s bronze-cuckoo, goes one better. The Horsfield’s bronze-cuckoo lays such a mimetic egg that it is never spotted or removed by hosts. Within 48 hours of hatching, the cuckoo chick evicts host fairy-wren young from the nest. However, two days after that, roughly 40 % of host fairy-wren mothers have the last laugh. They abandon the nest, leaving the cuckoo chick to starve to death, while they renest. Cuckoo chicks are recognized partly because they are alone in the nest, and partly through their odd sounding begging calls.

"We don’t really know why these Australian hosts are so much better at deserting cuckoo chicks than their British equivalents", says Dr Rebecca Kilner, of Cambridge University’s Zoology Department. "One possibility is that the Australian breeding season is longer, meaning that birds have more to gain from abandoning a breeding attempt at such a late stage. Australian birds have plenty of time for renesting which simply isn’t available to the British hosts".
The research is published in the March 13th issue of Nature.

Laura Morgan | alfa
Further information:
http://www.nature.com

More articles from Life Sciences:

nachricht New risk factors for anxiety disorders
24.02.2017 | Julius-Maximilians-Universität Würzburg

nachricht Stingless bees have their nests protected by soldiers
24.02.2017 | Johannes Gutenberg-Universität Mainz

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>