Lydia swims 100 miles in less than 2 days into the core of a large anticyclone

Two days ago I reported that Lydia swam towards a large anticyclonic (clockwise rotating) eddy or meanders (see post here).  She approached this anticyclone and swam northeast along its periphery.  In the past 24 hours, Lydia has turned southeast of the previous anticyclone and has entered into the center of an adjacent anticyclonic eddy!  Analysis of her interaction with eddies during her trip offshore in the summer and fall of 2013 (find more info here) suggests that she prefers the cores of anticyclones over cyclones and makes repetitive deep dives (often over 800 meters) while in the cores of anticyclones.  Her activity in the past few days suggest that she might be honing in on some cues, be they potential prey, mates, or other, and is occupying the core of yet another anticyclonic eddy.

Lydia's track overlaid on a map of sea level anomaly. Anticyclonic eddies and meanders are shown as orange and red features, cyclonic eddies and meanders and blue and purple features.

Lydia’s track overlaid on a map of sea level anomaly. Anticyclonic eddies and meanders are shown as orange and red features, cyclonic eddies and meanders are blue and purple features.

This begs the questions: Do white sharks seek out anticyclonic eddies because they are areas that concentrate prey and/or potential mates, or do they prefer the warm water found in anticyclones while swimming elsewhere?  We’ll keep a close eye on where Lydia goes from here and hope to be able to address these questions in the future.

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