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All data were collected with Mk10-PAT tags (Wildlife Computers, Redmond, WA) attached to living Humboldt squid (Dosidicus gigas) as described elsewhere (Gilly et al. 2006). Tags were programmed to sample at 0.5 Hz or 1 Hz. Tags deployed in Monterey Bay (CCS-1through CCS-6; deployed during OCE-0850839) were programmed to transmit time series data (75 s intervals = 0.01333 Hz) for depth, temperature and light to the Argos satellite system. Tags deployed in the Gulf of California (GOC-1 through GOC-6; deployed during OCE-0526640) were physically recovered, and the data were subsampled to match the 75 s interval of the CCS tags. This procedure was also carried out for tag CCS-6 that was recovered but never reported to Argos.
\nMk10 PAT tags measure depth from 0 to 2000 m with a resolution of 0.5 m and temperature from 0 to +40 degrees C with a resolution of 0.05 degree C. The tags were used as supplied by the manufacturer without additional calibration.
\nReferences:
\nGilly, W.F., Zeidberg, L.D., Booth, J.A.T, Stewart, J.S., Marshall, G., Abernathy, K., and Bell, L.E. 2012. Locomotion and behavior of Humboldt squid, Dosidicus gigas, in relation to natural hypoxia in the Gulf of California, Mexico. The Journal of Experimental Biology, 215, 3175-3190. doi: 10.1242/jeb.072538.
\nGilly, W.F., Markaida, U., Baxter, C.H., Block, B.A., Boustany, A., Zeidberg, L., Reisenbichler, K., Robinson, B., Bazzino, G., and Salinas, C. 2006. Vertical and horizontal migrations by the jumbo squid Dosidicus gigas revealed by electronic tagging. Marine Ecology Press Series, 324, 1-17. doi: 10.3354/meps324001.
\nStewart, J.S., Field, J.C., Markaida, U., and Gilly, W.F. 2013. Behavioral ecology of jumbo squid (Dosidicus gigas) in relation to oxygen minimum zones. Deep Sea Research Part II: Topical Studies in Oceanography, 95, 197-208. doi:10.1016/j.dsr2.2012.06.005.
Humboldt squid (Dosidicus gigas) were tagged from 2004-2009 in the California Current System (CCS) and Gulf of California (GOC). Data include the amount of time spent per temperautre bin from each tagged squid. Daily histograms can be produced by adding up the counts per day for each temperature bin. Each count in the count_night and count_day columns represents 75 seconds of time.
Counts of presence in each 0.5 degree C temperature bin were made from the 75 s time-series data using Matlab scripts. Each count represents a 75 s interval. Daytime and nighttime were defined by times of local sunrise and sunset (http://aa.usno.navy.mil/data/docs/RS_OneYear.php). Time-at-temperature histograms were computed from these data and reported as counts (75 s intervals) in 0.5 degree C bins for individual day and night periods. Note: Day 1 of deployment and the final day are not 24 hour days, because tag activation and pop-off occurred at arbitrary times.