ANOVAs were performed using SPSS Statistics 17.0 to determine
whether octopus movement was related to tide or time. Data do not
meet Levene's test of equality, due to the fact that the shallowest
area of the array was intermittently functional when equipment
was exposed during low tides. Movement distance
and movement rate were grouped into hourly bins by time of
day. Tidal information from Tides & Currents Pro for Windows v3.3
c 2004 for Valdez Arm-Ellamar-Tatitlek Narrows was used and the
range of tidal values over MLLW divided into four equal sections
and classified as low (−0.88 to 0.36 m), medium-low (0.37–1.60 m), medium-high (1.61–2.86 m), and high (2.87–4.11 m). A
chi-square test was performed to compare counts of movement
types to light levels classified as night, dawn, daylight, and dusk at
the time of movement.