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2015 ; 5
(ä): 16486
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English Wikipedia
Olfaction and topography, but not magnetic cues, control navigation in a pelagic
seabird: displacements with shearwaters in the Mediterranean Sea
#MMPMID26548946
Pollonara E
; Luschi P
; Guilford T
; Wikelski M
; Bonadonna F
; Gagliardo A
Sci Rep
2015[Nov]; 5
(ä): 16486
PMID26548946
show ga
Pelagic seabirds wander the open oceans then return accurately to their habitual
nest-sites. We investigated the effects of sensory manipulation on oceanic
navigation in Scopoli's shearwaters (Calonectris diomedea) breeding at Pianosa
island (Italy), by displacing them 400?km from their colony and tracking them. A
recent experiment on Atlantic shearwaters (Cory's shearwater, Calonectris
borealis) breeding in the Azores indicated a crucial role of olfaction over the
open ocean, but left open the question of whether birds might navigate by
topographical landmark cues when available. Our experiment was conducted in the
Mediterranean sea, where the availability of topographical cues may provide an
alternative navigational mechanism for homing. Magnetically disturbed shearwaters
and control birds oriented homeward even when the coast was not visible and
rapidly homed. Anosmic shearwaters oriented in a direction significantly
different from the home direction when in open sea. After having approached a
coastline their flight path changed from convoluted to homeward oriented, so that
most of them eventually reached home. Beside confirming that magnetic cues appear
unimportant for oceanic navigation by seabirds, our results support the crucial
role of olfactory cues for birds' navigation and reveal that anosmic shearwaters
are able to home eventually by following coastal features.