High olfactory sensitivity for dimethyl sulphide in harbour seals

Productive areas are patchily distributed at sea and represent important feeding grounds for many marine organisms. Although pinnipeds are known to travel on direct routes and return regularly to particular feeding sites, the environmental information seals use to perform this navigation is as yet u...

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Bibliographic Details
Published in:Biology Letters
Main Authors: Kowalewsky, Sylvia, Dambach, Martin, Mauck, Björn, Dehnhardt, Guido
Format: Article in Journal/Newspaper
Language:English
Published: The Royal Society 2005
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Online Access:http://dx.doi.org/10.1098/rsbl.2005.0380
https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2005.0380
https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2005.0380
Description
Summary:Productive areas are patchily distributed at sea and represent important feeding grounds for many marine organisms. Although pinnipeds are known to travel on direct routes and return regularly to particular feeding sites, the environmental information seals use to perform this navigation is as yet unknown. As atmospheric dimethyl sulphide (DMS) has been demonstrated to be a reliable indicator for profitable foraging areas, we tested seals for their ability to smell DMS at concentrations typical for the marine environment. Using a go/no-go response paradigm we determined the DMS detection threshold in two harbour seals ( Phoca vitulina vitulina ). DMS stimuli from 8.05×10 8 to 8 pmol (DMS) m −3 (air) were tested against a control stimulus using a custom-made olfactometer. DMS-thresholds determined for both seals (20 and 13 pmol m −3 ) indicate that seals can detect ambient concentrations associated with high primary productivity, e.g. in the North Atlantic. Thus, seals possess an extraordinarily high olfactory sensitivity for DMS, which could provide a sensory basis for identifying or orienting to profitable foraging grounds.