Abstract
In Inderasabah (southeast Sabah), tri-spine horseshoe crab Tachypleus tridentatus was observed for their locomotion activity using data loggers from September to November in 2015. A female with acceleration and depth-temperature loggers and five males with acceleration loggers were recaptured between 10 and 49 days after their release. From the record of 194 activity days that involve all six T. tridentatus, four horseshoe crabs, including the female, were active throughout the 24.0 h cycle, whereas the activity of the remaining two males was consistent with the 12.4 h cycle. Using the 40-day recording, three horseshoe crabs, including the female, were primarily active around the new moon and full moon, but they were dormant around the first and third quarter moon days. The female spent much time in shallow shores (depth < 0.3 m) during the new moon and full moon. This result indicated that the female attempted to spawn in a minimum of three spring tide periods while lingering in the vicinity. Meanwhile, after spawning, the female spent time foraging in shallow water (depth 0.3–18 m). As for the two male individuals, their activity was consistent with semi-lunar periodicity. Therefore, both of them were in amplexus. In addition, a solitary male individual was active only during the first and third quarter moon days. Through activity recording, all the T. tridentatus in Inderasabah was active during daytime and nighttime. This result was contrary to T. tridentatus activity cycles in western Japan, where the species was found to be primarily nocturnal. Perhaps, the regional differences in activity cycles for T. tridentatus were related to their population adaptation toward water temperature, depth, and prey-searching periods.
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Acknowledgements
This study was funded by the Sabah Biodiversity Center, SaBC (No. TJ 66917). The authors thank the villagers/fishermen in Inderasabah, especially Mr. Jeffri and his family, for their help during the sampling period and particularly for the recoveries of biologging devices.
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Watanabe, S., Nelson, B.R., Manca, A. et al. Activity Recording of Free-Ranging Tri-spine Horseshoe Crabs in the Southeastern Coast of Sabah, Borneo. J. Ocean Univ. China 21, 549–556 (2022). https://doi.org/10.1007/s11802-022-5190-0
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DOI: https://doi.org/10.1007/s11802-022-5190-0