Diel movement patterns of the Hawaiian stingray, Dasyatis lata: implications for ecological interactions between sympatric elasmobranch species
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چکیده
The Hawaiian stingray, Dasyatis lata, is a common benthic elasmobranch in nearshore Hawaiian waters. Acoustic telemetry was used to track the movements of seven rays in Kaneohe Bay, Oahu, Hawaii. Rays were tracked continuously over 31–74 h periods. Geographical movements were analyzed to determine space utilization and rate of movement. Rays were found to utilize significantly larger activity spaces at night (0.83±0.70 km) (mean±SD) than during the day (0.12±0.15 km). Mean total activity space for rays tracked was 1.32±0.75 km. Rates of movement were also significantly higher at night (0.34±0.30 km h) than during the day (0.15±0.22 km h). Average straight-line swimming speed was 0.64±0.16 km h, with a maximum observed swimming speed of 1.9 km h. Tidal stage had no effect on rate of movement. Comparison with previously published data on juvenile scalloped hammerhead sharks, Sphyrna lewini, in Kaneohe Bay revealed a high degree of overlap in habitat use and time of activity, suggesting possible ecological interactions between these two species.
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