Journal
JOURNAL OF EXPERIMENTAL BIOLOGY
Volume 216, Issue 8, Pages 1430-1433Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.082826
Keywords
anosmia; homing; olfaction; procellariiform seabirds; short-range orientation; zinc sulphate
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Funding
- Marie Curie intra-European Fellowship
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Olfactory cues have been shown to be important to homing petrels at night, but apparently those procellariiform species that also come back to the colony during the day are not impaired by smell deprivation. However, the nycthemeral distribution of homing, i.e. whether displaced birds released at night return to their burrow by night or during daylight, has never been investigated. To explore this question, we studied the homing behaviour of Cory's shearwater (Calonectris borealis) in the only known population where these birds are active at the colony both during the day and at night. Here, we compared the nocturnal versus diurnal homing schedule of birds treated with zinc sulphate (to induce a reversible but complete anosmia) with that of controls. Our results show that anosmic shearwaters were unable to home in the dark and were constrained to wait for the daylight to find their burrow again. Our results confirm that olfaction is the basic sensory input for homing by night even in a petrel species that is diurnally active at the colony.
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