Smelling home: a good solution for burrow-finding in nocturnal petrels?

Area of Science:

• Ornithology
• Animal Behavior
• Sensory Ecology

Background:

• Many petrel species exhibit remarkable navigation abilities, returning to nests in challenging conditions.
• Olfactory systems in petrels are well-developed, suggesting a potential role in navigation.
• Different nesting habits (burrow vs. surface) may influence reliance on specific sensory modalities.

Purpose of the Study:

• To investigate the role of olfaction in nest recognition across nine petrel species with varying nesting behaviors.
• To determine if olfactory cues are essential for nocturnal navigation in burrow-nesting petrels.
• To compare sensory reliance between nocturnal/burrowing and diurnal/surface-nesting petrels.

Main Methods:

• Experiments involved rendering nine petrel species temporarily anosmic (unable to smell) using nostril plugs or zinc sulphate nasal application.
• Anosmic birds were compared to sham-treated control groups.
• Nest recognition success was assessed in relation to nesting habits and activity patterns (nocturnal vs. diurnal).

Main Results:

• Impaired nest recognition was observed exclusively in burrow-nesting petrel species that navigate at night.
• Petrels nesting on the surface or active during the day showed no significant impairment in nest recognition after olfactory manipulation.
• This indicates a species-specific reliance on olfaction for navigation.

Conclusions:

• Nocturnal, burrow-nesting petrels likely utilize olfactory cues for precise burrow identification in complete darkness.
• Diurnal or surface-nesting petrels appear to prioritize visual cues for locating their nests.
• Sensory navigation strategies in petrels are adapted to their specific ecological niche and nesting requirements.