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MEPS prepress abstract   -  DOI:

Two-way habitat use between reefs and open ocean in the greater amberjack adult: evidence from biologging data

Kazuki Tone*, Wei-Chuan Chiang, Hsin-Ming Yeh, Sheng-Tai Hsiao, Chun-Huei Li, Kazuyoshi Komeyama, Kensuke Kudo, Takamasa Hasegawa, Takashi Sakamoto, Itsumi Nakamura, Yoshitaka Sakakura, Ryo Kawabe

*Corresponding author:

ABSTRACT: We investigated the relationships between vertical movements and both oceanographic features and physiological factors in greater amberjack (Seriola dumerili), which is a reef-associated predator in the East China Sea. S. dumerili in the coastal waters of eastern Taiwan were equipped with archival tags or pop-up satellite archival tags that recorded depth and temperature, resulting in a dataset covering a total of 1,331 days from 12 individuals. To classify the vertical movement patterns of S. dumerili, we performed a hierarchical cluster analysis for the depth profile. We observed multiple vertical movement patterns. The S. dumerili around topographic features showed short-step dives (averaging <35 m) during both the daytime and nighttime. In contrast, the S. dumerili in offshore areas showed diel vertical movements. S. dumerili occasionally performed frequent dives to approx. 150 m throughout the day. These phenomena may be related to foraging behaviors associated with changes in water depth. We further analyzed the response of the peritoneal cavity temperature to variations in the ambient temperature in seven S. dumerili with archival tags. Their peritoneal cavity temperatures fluctuated according to the ambient temperature changes, indicating that the vertical movement of S. dumerili is limited by physiological constraints for the maintenance of body temperature. Together our results indicate that the vertical movement of S. dumerili may be affected by the trade-off between foraging and thermoregulation.