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Food intake and fuel deposition in a migratory bird is affected by multiple as well as single-step changes in the magnetic field

Henshaw, Ian (author)
Stockholms universitet,Zoologiska institutionen
Fransson, Thord (author)
Jakobsson, Sven (author)
Stockholms universitet,Zoologiska institutionen
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Lind, Johan (author)
Stockholms universitet,Zoologiska institutionen,Centrum för evolutionär kulturforskning
Vallin, Adrian (author)
Stockholms universitet,Zoologiska institutionen
Kullberg, Cecilia (author)
Stockholms universitet,Zoologiska institutionen
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 (creator_code:org_t)
The Company of Biologists, 2008
2008
English.
In: Journal of Experimental Biology. - : The Company of Biologists. - 0022-0949 .- 1477-9145. ; 211, s. 649-653
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Recent studies have shown that migratory thrush nightingales (Luscinia luscinia) experimentally treated with multiple changes of the magnetic field simulating a journey to their target stopover area in northern Egypt, increased fuel deposition as expected in preparation to cross the Sahara desert. To investigate the significance of food intake on the body mass changes observed, in the work described here we analysed food intake of the nightingales under study in those earlier experiments. Furthermore, to study whether a single change in the magnetic field directly to northern Egypt is sufficient to provide information for fuelling decisions, we performed a new experiment, exposing thrush nightingales trapped in Sweden, directly to a magnetic field of northern Egypt. Our results show that an experimentally induced magnetic field of northern Egypt, close to the barrier crossing, triggers the same response in fuel deposition as experiments with multiple changes of the magnetic field simulating a migratory journey from Sweden to Egypt, suggesting that migratory birds do not require successive changes in field parameters to incorporate magnetic information into their migratory program. Furthermore, irrespective of experimental set up (single or multiple changes of the magnetic field parameters) increase in food intake seems to be the major reason for the observed increase in fuelling rate compared with control birds, suggesting that geomagnetic information might trigger hormonal changes in migratory birds enabling appropriate fuelling behaviour during migration.

Subject headings

NATURVETENSKAP  -- Biologi -- Zoologi (hsv//swe)
NATURAL SCIENCES  -- Biological Sciences -- Zoology (hsv//eng)

Keyword

geomagnetic cues
bird migration
food intake
fuel deposition

Publication and Content Type

ref (subject category)
art (subject category)

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