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First published online August 31, 2004
Journal of Experimental Biology 207, 3537-3544 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01198

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Testing olfactory foraging strategies in an Antarctic seabird assemblage

Gabrielle Nevitt^1,*, Keith Reid² and Phil Trathan²

¹ Section of Neurobiology, Physiology and Behaviour, University of California, Davis, California 95616, USA
² High Cross, British Antarctic Survey, Madingley Road, Cambridge CB3 OET, UK

View larger version (34K): [in a new window]   Fig. 1. (A) The location of South Georgia Island relative to the Antarctic Peninsula. (B) Detail of the Maurice Ewing Bank (MEB) transect line and 23 stations. Experiments were conducted at stations 3, 4, 8, 9, 10, 13, 15, 19 and 20. Abbreviations: NGR, Northwest Georgia Rise; NEGR, Northeast Georgia Rise.

View larger version (22K): [in a new window]   Fig. 2. Species composition of birds along the Maurice Ewing Bank (MEB) transect as determined by survey counts leading up to experimental stations (see text). Species codes are: unpr, unidentified prion (Pachyptila sp.); waal, wandering albatross (Diomedea exulans); grsw, great shearwater (Puffinus gravis); sopt, soft-plumaged petrel (Pterodroma mollis); bbsp, black-bellied storm-petrel (Fregetta tropica); capt, Cape petrel (Daption capense); blpt, blue petrel (Halobaena caerulea); ugpt, unidentified giant petrel (Macronectes sp.); bbal, black-browed albatross (Diomedea melanophris); wisp, Wilson's storm-petrel (Oceanites oceanicus); ghal, grey-headed albatross (Diomedea chrysostoma); wcpt, white-chinned petrel (Procellaria aequinoctialis); knpn, king penguin (Aptenodytes patagonicus); sosw, sooty shearwater (Puffinus griseus); roal, Southern royal albatross (Diomedea epomophora); soal, sooty albatross (Phoebetria fusca); whpt, white-headed petrel (Pterodroma lessonii); lmal, light-mantled sooty albatross (Phoebetria palpebrata); undp, unidentified diving petrel (Pelecanoides sp.); spsk, South polar skua (Catharacta maccormicki).

View larger version (20K): [in a new window]   Fig. 3. Relative attraction to experimental (pyrazine, black bars; herring, grey bars) and control slicks. Positive values (upward bars) indicate a positive attraction to pyrazine- or herring-scented slicks whereas negative values (downward bars) indicate a positive attraction to control (plain vegetable oil). So, for example, a value of +1 indicates that a species was only observed at an experimental slick and never at a control slick. An asterisk (*) indicates a significant attraction in the direction indicated (G-test for pooled data, P<0.05; Zar, 1996).

View larger version (17K): [in a new window]   Fig. 4. Three `typical' response profiles over time to pyrazine (filled circles) and herring oil (open circles); control data are subtracted. Profiles are illustrated for (A) Wilson's storm-petrels (Oceanites oceanicus), (B) giant petrels (Macronectes sp.) and (C) white-chinned petrels (Procellaria aequinoctialis) (see text).