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. 2011 Apr 7;6(4):e18603. doi: 10.1371/journal.pone.0018603

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Bertolo et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Open symbols: day (9 am–3 pm); filled symbols: night (9 pm–3 am). Radio-tracking data are pooled for all individuals that belonged to a given tactic (tactic I: two individuals; tactic II: two individuals; tactic III: five individuals; tactic IV: seven individuals). Isobaths are shown (1 m intervals; maximum depth = 17 m).