Figure 1.

(a) Diel pattern in the dive behavior of 14 seals. Although variation was observed among individuals, all seals adjusted their diving behavior according to the vertical diel migration of prey (average value calculated every hour). (b) Migration paths of the 14 postbreeding adult female seals in the Northeast Pacific. All seals migrated within the normal range of postbreeding female northern elephant seals. (c) Extracted example of dive depth and nJME. Distribution pattern of dive depth (red line) and the depths where jaw motion events (JME) occurred (circle) showed an apparent diel pattern. Seals showed very deep diving episodically during daytime hours (i.e., dives in the green box), suggesting that seals targeted different prey available at deep depths only during daytime