Home range of immature green turtles tracked at an offshore tropical reef using automated passive acoustic technology |
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Authors: | Julia Hazel Mark Hamann Ivan R. Lawler |
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Affiliation: | 1. School of Earth and Environmental Sciences, James Cook University, Townsville, QLD, 4811, Australia 2. Centre for Tropical Water and Aquatic Ecosystem Research, Townsville, QLD, 4811, Australia
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Abstract: | Seventeen immature green turtles Chelonia mydas were tracked concurrently by automated ultrasonic receivers at a coral reef off North-Eastern Australia (September–December 2010, 16.4°S, 145.6°E). The majority (n = 11) were tracked for the entire 100-day study, the remainder for 23–85 days. Detection data aggregated at 30-min intervals produced median 6.5–35 daily locations for individual turtles. Home range areas (95 % utilisation distribution) were ≤1 km2, $ {bar{text{x}}} $ ± SD = 0.74 km2 ± 0.159. To the best of our knowledge, these are the first home range estimates for C. mydas foraging at offshore tropical reefs. The findings are important for conservation in revealing near-continuous presence of the same individuals within a small geographic area. Time between detections was very short (median <3 min) demonstrating passive ultrasonic technology can track multiple turtles in a foraging environment with higher temporal resolution than typically achieved by satellite tracking. |
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