Navigation Links
Shorebirds shape up and ship out
Date:1/20/2010

Some Canadian shorebirds have had to get fit or die trying. Research published in the open access journal BMC Ecology has found that the average Pacific dunlin has lost weight and spends more time in flight as a response to the increased threat of predation from their arch-enemy, the peregrine falcon.

Fortunately for the falcon, the outlawing of the highly toxic chemical fertilizer DDT in the 1970s has led to an increase in their population. Bad luck though for Pacific dunlins, which once enjoyed lazy winter afternoons roosting in relative safety on the shore of the Fraser River estuary in British Columbia. Drawing on a pool of data spanning four decades, a team of ecologists led by Ronald Ydenberg from Simon Fraser University has found that the dunlins have had to adapt their behavior and their diets in order to survive. Ydenberg says, "In the past, dunlins stored up fat reserves in the autumn months so that they could survive the harsh Canadian winters when food is short. What we're seeing now, however, with the increase in numbers of peregrine falcons, is that the dunlins have to consider the energy trade-off between preparing for starvation and being able to escape quickly".

Starving during the winter is still a very real possibility for Pacific dunlins, but they can no longer rest easy now that peregrine falcons are around. Some dunlins will fly long distances to find safer roosts, but many now choose to take to the air en masse during peak peregrine feeding times instead. "Over-ocean flocking is energetically expensive", says team member Dick Dekker, "but the risk from predators is now greater than the threat of starvation". When a streamlined hunter is hot on your tail, it doesn't pay to be a fat bird. The average weight of a Pacific dunlin has decreased by 2-4g over the past 40 years. These adaptations, along with spending more time flying out at sea, help the dunlin to escape predators so that they can safely make it through the winter.


'/>"/>

Contact: Graeme Baldwin
graeme.baldwin@biomedcentral.com
44-203-192-2165
BioMed Central
Source:Eurekalert

Related biology news :

1. Facial attraction -- choice of sexual partner shaped the human face
2. Shape encoding may start in the retina
3. Grant supports study of abnormal ring-shaped chromosomes
4. Secure Services Corp. Achieves Milestone in United States Identity Protection with the Launch of the SSC SHAPE Card Management Solution
5. How cells keep in shape
6. New process makes nanofibers in complex shapes and unlimited lengths
7. Particle accelerator may reveal shape of alternate dimensions
8. Crop scientists discover gene that controls fruit shape
9. Ozone hole recovery may reshape southern hemisphere climate change
10. Study links low-frequency hearing to shape of the cochlea
11. Courtship pattern shaped by emergence of a new gene in fruit flies
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/16/2016)... , June 16, 2016 ... size is expected to reach USD 1.83 billion ... Grand View Research, Inc. Technological proliferation and increasing ... applications are expected to drive the market growth. ... , The development of advanced multimodal ...
(Date:6/3/2016)... 2016 Das DOTM ... Nepal hat ein 44 Millionen ... Kennzeichen, einschließlich Personalisierung, Registrierung und IT-Infrastruktur, an ... und Implementierung von Identitätsmanagementlösungen. Zahlreiche renommierte internationale ... teilgenommen, aber Decatur wurde als konformste und ...
(Date:5/24/2016)... 24, 2016 Ampronix facilitates superior patient care by providing unparalleled technology to ... display is the latest premium product recently added to the range of products distributed ... ... ... Imaging- LCD Medical Display- Ampronix News ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... , ... June 27, 2016 , ... Parallel 6 ... trials, announced today the Clinical Reach Virtual Patient Encounter CONSULT module which ... with the physician and clinical trial team. , Using the CONSULT module, patients and ...
(Date:6/27/2016)... --  Ginkgo Bioworks , a leading organism design ... awarded as one of the World Economic Forum,s ... innovative companies. Ginkgo Bioworks is engineering biology to ... in the nutrition, health and consumer goods sectors. ... including Fortune 500 companies to design microbes for ...
(Date:6/24/2016)... NC (PRWEB) , ... June 24, 2016 , ... Researchers ... the most commonly-identified miRNAs in people with peritoneal or pleural mesothelioma. Their findings are ... to read it now. , Diagnostic biomarkers are signposts in the blood, lung ...
(Date:6/23/2016)... 23, 2016 /PRNewswire/ - FACIT has announced the ... biotechnology company, Propellon Therapeutics Inc. ("Propellon" or ... of a portfolio of first-in-class WDR5 inhibitors for ... as WDR5 represent an exciting class of therapies, ... medicine for cancer patients. Substantial advances have been ...
Breaking Biology Technology: