HOME >> BIOLOGY >> NEWS
Learning how to help migrating swans find forage

Do foraging decisions tell us something about the cost of foraging? Dutch swan experts at the Netherlands Institute of Ecology (NIOO-KNAW) were interested in the apparent heterogeneity in the use of agricultural fields by migratory Bewicks swans. In Wieringermeer, a typical Dutch polder that was reclaimed from the sea in 1930, Bewicks swans stop by during migration to feed on the leftovers of sugarbeets that remain after the farmers harvest. The ornithologists were interested in why some fields were used more intensively than others, while all fields seem to offer similar amounts of food right from the start. They wondered: "In case foraging benefits seem to be equal across all fields, there may be variation in foraging costs that may explain the observed spatial heterogeneity in exploitation." The authors showed, in the May issue of the American Naturalist, that the time spent feeding on a field by a flock of swans can be used as a surrogate of an individuals energy intake rate (which declines over time due to depletion). This showed that an individuals intake rate at abandoning a field, which should reflect the foraging cost as experienced by the bird itself, decreased with the distance to roads and increased with the distance to its nighttime roost. The higher intake rates at which fields near roads were given up reflected the chance to be disturbed by humans. The higher intake rates at which fields far from roosts were given up could be explained by the energetic cost of flight, which are substantial for large birds such as Bewicks swans. When taking these flight costs into account, the authors calculated that the net benefits at which each field was given up corresponded with the net benefits obtained in the long run. The latter was measured via regular visual inspection of the thickness of each birds belly!

All these insights into foraging costs could be implemented into a model that predicted the number of swans that potentially could stop by at
'"/>

Contact: Patricia Morse
pmorse@uchicago.edu
773-702-0446
University of Chicago Press Journals
30-Apr-2007


Page: 1 2

Related biology news :

1. Learning to evolve: With a little help from my ancestors
2. Learning a second language -- Is it all in your head?
3. Protein pulling -- Learning how proteins fold by pulling them apart
4. Learning during sleep?
5. Learning how nature splits water
6. Learning global solutions to local problems
7. Learning to live with oxygen on early Earth
8. Learning the lessons of the worlds oldest ecological experiment
9. Learning the language of DNA
10. SNM Lifelong Learning and Self-Assessment program modules approved by ABNM, ABR for CME credit
11. Learning to love bacteria: Stanford scientist highlights bugs benefits

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/27/2021)... ... March 25, 2021 , ... Phlexglobal announced ... Planet Group, has selected Phlexglobal and its innovative regulatory SaaS software, PhlexSubmission, as ... a comprehensive review of five regulatory software companies, with the review team including ...
(Date:3/27/2021)... ... 25, 2021 , ... The 2021 Virtual Conference on Clinical Trial Supply-Europe ... More and more, clinical trial supply conferences are featuring speakers and forums that ... Asymmetrex’s founder and CEO, James L. Sherley, M.D., Ph.D., presented a talk ...
(Date:3/23/2021)... ... March 23, 2021 , ... G-CON Manufacturing (G-CON), the ... by Matica Biotechnology (Matica Bio), a contract development and manufacturing organization (CDMO) specializing ... the cleanroom build out for its new GMP production facility in College Station, ...
Breaking Biology News(10 mins):
(Date:3/27/2021)... ... March 24, 2021 , ... ... Life Sciences and Healthcare firms of all sizes, adds depth to its team ... specialist. Pardillo, who earned his doctorate in computational chemistry from Florida International University ...
(Date:3/27/2021)... ... March 24, 2021 , ... ABI Wellness, ... and reporting approach designed under CEO Mark Watson, today announced a webinar dedicated ... featuring guest speakers Dr. Cameron Clark, Neuropsychologist and Founder of Sharp Thinking, and ...
(Date:3/27/2021)... ... ... The Xtalks editorial team is pleased to announce the launch of the ... joined by editorial team members Ayesha Rashid, Sydney Perelmutter and Mira Nabulsi to discuss ... including insights from industry experts. , The Xtalks Life Science podcast will feature ...
(Date:3/23/2021)... Conn. (PRWEB) , ... March 23, 2021 , ... ... develops solutions for characterizing microbiome populations down to the strain level, recently unveiled ... applications. , Not all microbes are created equal: some are easy to ...
Breaking Biology Technology:
Cached News: