Electrophysiological responses to odor have been recorded for concen trations as low as 0.01 ppm for Manx shearwaters Puffinus puffinus and Black-footed Albatrosses Diomedea nigripes, indicating that relative to most birds, procellariiforms have a keen sense of smell (Wenzel and Sieck 1972, cf.clark 1991; Clark and Smeraski 1990; Clark and Mason 1989). Such acuity is not unexpected, given the extensive development of the olfactory anatomy of these species (Bang and Wenzel 1986). Field observations indi cate that Procellariiformes use their sense of smell to locate food (Grubb 1972; Hutchison and Wenzel 1980; Lequette, Verheyden and Jouventin 1989). -_ However, it is not known how far from the source petrels can detect odors. This information would improve our understanding of procellariiform forag ing ecology and engender a broader appreciation of the selective forces involved in shaping the evolution of the sensory anatomy of this group (Healy and Guilford 1990). Herein, we report preliminary.observations on the odor sensitivity of Leach's Storm Petrel Oceanodroma leucorhoa to the major components of natural prey items. The detection data are used to generate a first order estimate of the odor active space for free ranging petrels.
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