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:8/7/2020)... ... August 06, 2020 , ... Nine middle school teachers ... Scholar Program, a unique professional development program that provides advanced STEM (science, technology, ... science teachers nationwide. , Created in partnership between the National Stem Cell Foundation ...
(Date:7/31/2020)... ... July 30, 2020 , ... BioFactura, Inc. today announced ... the Joint Science & Technology Office—Chemical and Biological Defense (JSTO-CBD) of the Department ... scale-up a highly efficient mammalian cell culture-based bioprocess suitable to meet surge requirement ...
(Date:7/18/2020)... ... July 16, 2020 , ... ... effectiveness of the Invictus Medical Neoasis™ active noise control device to attenuate typical ... that the Neoasis™ device attenuated the alarm sounds from patient monitors, ventilators and ...
Breaking Biology News(10 mins):
(Date:7/7/2020)... ... July 06, 2020 , ... R3 International is now offering stem cell ... million stem cells. Depending on the patient's condition, treatment may be offered IV, intrathecal ... having some form of Alzheimers dementia, and the incidence continues to increase as individuals ...
(Date:7/1/2020)... ... June 29, 2020 , ... MedShift , a leading ... despite many obstacles created as a result of COVID-19. As a provider at ... medical practices and medical manufacturers by expanding access to device offerings, technology services, ...
(Date:7/1/2020)... ... June 30, 2020 , ... ... that the launch of a new clinical diagnostics immuno-oncology service, TissueInsight ... microenvironment (TME). , “Flagship’s TissueInsight is a service that aids pathologists, oncologists, ...
(Date:6/28/2020)... (PRWEB) , ... June 25, 2020 , ... ... are racing to develop a vaccine or drug treatment. In an effort to ... has publicly released the world’s largest imaging dataset portraying therapeutic compound effects ...
Breaking Biology Technology:
Cached News: