Age-Dependent Orientation to Magnetically-Simulated Geographic Displacements in Migratory Australian Silvereyes (Zosterops l. lateralis)

Autor:	John B. Phillips, Mark E. Deutschlander, Ursula Munro
Rok vydání:	2012
Předmět:	Ecology biology Magnetic dip Age dependent biology.organism_classification Passerine Zosterops Geography Earth's magnetic field biology.animal Orientation (geometry) Juvenile Animal Science and Zoology Ecology Evolution Behavior and Systematics
Zdroj:	The Wilson Journal of Ornithology. 124:467-477
ISSN:	1938-5447 1559-4491
DOI:	10.1676/11-043.1
Popis:	Geographic relocations of migratory passerines have shown that adults can compensate for physical displacements; juveniles on their first migration, however, use an innate clock-and-compass strategy and are unable to compensate for displacement. We examined the effects of changes in magnetic inclination and intensity on orientation of adult and juvenile Australian Silvereyes (Zosterops l. lateralis) to learn if geomagnetic cues are used by a migratory passerine for geographic positioning. Silvereyes, captured in breeding areas in Tasmania, were physically transported to a location along their migratory route and assessed for orientation during autumn migration. Adults and juveniles exhibited seasonally appropriate, northeasterly orientation (19° and 23° east of magnetic North, respectively) when tested under the natural geomagnetic field. Birds were then exposed to changes in the magnetic field that simulated either southern (SimS) or northern (SimN) locations near the beginning and end, respecti...
Databáze:	OpenAIRE
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