Navigation Links
Environmental change impacts on migratory shorebirds differ for males and females
Date:3/11/2013

Extensive shell fishing and sewerage discharge in river estuaries could have serious consequences for the rare Icelandic black-tailed godwits that feed there. But it is the males that are more likely to suffer, according to new research from the University of East Anglia.

Research published today in the journal Ecology and Evolution reveals very different winter feeding habits between the sexes.

Both males and females mainly consume bivalve molluscs, sea snails and marine worms, probing vigorously into soft estuary mud with their long beaks. But the study shows that females, which are larger and have longer bills, are able to peck further into the silt to secure larger, deeper buried prey in areas that the shorter-billed males cannot reach. This means that human impacts on estuaries may have different impacts on males and females, depending on which prey sizes are most affected.

The godwit is a large, long-legged, long-billed migratory shorebird. It breeds almost exclusively in Iceland and winters on western European coasts, from the UK and Ireland in the north to the Iberian Peninsula in the south.

The 15-year study saw researchers weigh, measure, sex and ring-tag 1287 birds at locations including the Solent, the Wash Estuary in East Anglia, Iceland and Portugal. More than 2,000 volunteer observers took part in determining where males and females spend the winter, and the researchers measured what the birds were feeding on, how deeply they forage, and how quickly they find, catch and eat their prey.

Dr Jos Alves from UEA's school of Biological Sciences lead the research. He said: "We knew that females can be as much as 18 per cent larger than the males but we wanted to see what impact this difference had on their migration, feeding and segregation patterns.

"We found that the difference didn't have any impact on their distribution across the wintering area, as both sexes are able to cover the same distances. But we did find that they segregate into different foraging areas on estuary mudflats during winter.

"This is because they are selecting different types and sizes of prey to feed on. Because the females are larger, they need more food. Luckily they are also able to dig deeper and feed on larger prey particularly the ragworm, Hediste diversicolor, and specifically on large size classes of this marine worm.

"But the smaller males are restricted by their bill size and are only able to dig out and eat smaller prey particularly Scrobicularia plana, which is a bivalve mollusc, and smaller worms. Therefore, the amount of sexual segregation depends on the scale and variety of prey available at different sites.

"This could have knock-on effects because any environmental impacts on their food chain will affect the sexes in different ways," added Dr Alves

"In particular, the highest abundances of large ragworms tend to be found in mudflats with high levels of wastewater discharge, and females then prefer to forage on these sites. Ongoing improvements in wastewater discharging are likely to mean that large worms become less abundant, forcing the females to forage elsewhere.

"The black-tailed godwit is classified as 'near threatened' so this research will be important for future conservation work for the species."


'/>"/>

Contact: Lisa Horton
l.horton@uea.ac.uk
44-016-035-92764
University of East Anglia
Source:Eurekalert  

Related biology news :

1. Effects of environmental toxicants reach down through generations
2. Reproductive health providers should discuss environmental exposure risks with patients
3. Environmental factors in Tiny Tims near fatal illness
4. Increasing water scarcity in Californias Bay-Delta will necessitate trade-offs; hard decisions needed to balance various environmental risks
5. Stomata development in plants unraveled -- a valuable discovery for environmental research
6. Long-term research reveals causes and consequences of environmental change
7. New museum-university partnership ushers in new era of environmental science education
8. Tiny plants could cut costs, shrink environmental footprint
9. Wells Fargo fosters environmental conservation through University of Miamis RJD program
10. Environmental benefit of biofuels is overestimated, new study reveals
11. Reed Elsevier Environmental Challenge shortlists 2012 projects
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Environmental change impacts on migratory shorebirds differ for males and females
(Date:5/20/2016)... , May 20, 2016  VoiceIt is excited ... with VoicePass. By working together, VoiceIt ...  Because VoiceIt and VoicePass take slightly different approaches ... increases both security and usability. ... about this new partnership. "This marketing ...
(Date:5/12/2016)... 2016 WearablesResearch.com , a brand of ... results from the Q1 wave of its quarterly wearables ... consumers, receptivity to a program where they would receive ... insurance company. "We were surprised to see ... Michael LaColla , CEO of Troubadour Research, "primarily because ...
(Date:5/3/2016)... 3, 2016  Neurotechnology, a provider of high-precision ... Automated Biometric Identification System (ABIS) , a complete ... MegaMatcher ABIS can process multiple complex biometric transactions ... of fingerprint, face or iris biometrics. It leverages ... and MegaMatcher Accelerator , which have been ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... June 27, 2016   Ginkgo Bioworks , a ... engineering, was today awarded as one of the ... the world,s most innovative companies. Ginkgo Bioworks is ... the real world in the nutrition, health and ... directly with customers including Fortune 500 companies to ...
(Date:6/24/2016)... Epic Sciences unveiled a liquid biopsy ... PARP inhibitors by targeting homologous recombination deficiency (HRD) ... test has already been incorporated into numerous clinical ... Over 230 clinical trials are investigating ... PARP, ATM, ATR, DNA-PK and WEE-1. Drugs targeting ...
(Date:6/24/2016)... ... , ... Researchers at the Universita Politecnica delle Marche in Ancona combed medical ... mesothelioma. Their findings are the subject of a new article on the Surviving Mesothelioma ... in the blood, lung fluid or tissue of mesothelioma patients that can help point ...
(Date:6/23/2016)... ... June 23, 2016 , ... UAS LifeSciences, one ... of their brand, UP4™ Probiotics, into Target stores nationwide. The company, which has ... add Target to its list of well-respected retailers. This list includes such fine ...
Breaking Biology Technology: