14:00 〜 14:15
[BPT03-02] Oceanic Imprints: Deciphering the Life History of the Squid, Uroteuthis duvaucelii Through Statolith Microchemistry in the Tropical Western Pacific
キーワード：Indian squid、LA-ICP-MS、Calcium carbonate、Statolith
The Uroteuthis duvaucelii is a common coastal squid of significant commercial value in the Indo-Pacific region. However, limited studies have been done on the statolith microchemistry of this squid, which can reveal important information on the population structures, life histories, movement patterns, and habitat characteristics. Thus, the study aims to characterize the statolith microchemistry of U. duvaucelii populations caught in Taiwan, Malaysia and the Philippines.
By using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), measurable concentrations of several trace elements have been detected, including strontium (Sr), magnesium (Mg), manganese (Mn), iron (Fe), barium (Ba), and sodium (Na). Furthermore, the variations in trace elements to calcium ratios provide insights into the habitat characteristics associated with different ontogenetic stages and the population structure. For instance, the Sr/Ca ratio is known to correlate with temperature and habitat characteristics and as the most abundant element within aragonitic statolith, whereas Ba/Ca ratio indicates vertical movement. On the other hand, the ratios of Na/Ca and Mg/Ca may reflect distinct physiological processes and environmental changes in marine ecosystems. Moreover, different environmental factors also affect the absorption of these elements. The Mn/Ca and Fe/Ca ratios are key indicators for various squid cohorts.
This study revealed that statolith microchemistry provides valuable insights into the life history, ontogenetic patterns, and population structure of U. duvaucelii throughout the Western Pacific region. Our results can be used as a basis for considering fishing regulations to conserve this species.
By using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), measurable concentrations of several trace elements have been detected, including strontium (Sr), magnesium (Mg), manganese (Mn), iron (Fe), barium (Ba), and sodium (Na). Furthermore, the variations in trace elements to calcium ratios provide insights into the habitat characteristics associated with different ontogenetic stages and the population structure. For instance, the Sr/Ca ratio is known to correlate with temperature and habitat characteristics and as the most abundant element within aragonitic statolith, whereas Ba/Ca ratio indicates vertical movement. On the other hand, the ratios of Na/Ca and Mg/Ca may reflect distinct physiological processes and environmental changes in marine ecosystems. Moreover, different environmental factors also affect the absorption of these elements. The Mn/Ca and Fe/Ca ratios are key indicators for various squid cohorts.
This study revealed that statolith microchemistry provides valuable insights into the life history, ontogenetic patterns, and population structure of U. duvaucelii throughout the Western Pacific region. Our results can be used as a basis for considering fishing regulations to conserve this species.