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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Biol Bull. 2014 Dec;227(3):263–273. doi: 10.1086/BBLv227n3p263

Figure 7.

Figure 7

The relationship between changes in ambient light levels and the activity of an eyeless Melibe specimen. The percentage of each 10-min time interval that a single animal was active, from 5 consecutive days, was averaged along with light data, for the same time intervals. Error bars represent SEM. Data were obtained in February 2013, so the days were relatively short. Note how nocturnal activity does not increase until after sunset is complete, and how sedentary this animal became after sunrise, indicating that the animal still coordinated its locomotor activity to light levels.