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. 2019 Nov 22;7:e8087. doi: 10.7717/peerj.8087

Figure 3. Movement activity of the sea urchins Strongylocentrotus intermedius in response to starfish attacks.

Figure 3

(A) Starfish attack on September 5, 2015. (B) Starfish attack on September 21, 2015. Red rhombuses denote sea urchin distances from the site of the attack, mean ± SD (n = 13). Black squares connected by dashed line denote the sum number of two species of sea stars (Patiria pectinifera and Lethasterias fusca) at the site of the attack. Red circles connected by solid line denote the number of sea urchins in the cameras’ field of view. Time of the beginning of the attack is indicated by a black asterisk.