Example of <i>Clausocalanus furcatus</i> swim and sink motion pattern.

<p>This type of pattern was recorded in the absence of food (in filtered seawater) both in 2008 and 2009. Top (A) and lateral (B) view of a 30 s trajectory (S, start; E, end) and corresponding velocity diagram (C). The pattern is composed by a sequence of (a) sinking, (b) upward swimming, (c) ample turning, and (d) downward swimming. Top view (D) of a 5 min long trajectory showing the same pattern. A 1-minute 3D animation of the pattern described in this figure is provided in the supplemental material (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0067640#pone.0067640.s003" target="_blank">Video S3</a>).