Jeong Hyeryeong, Ra Kongtae, Araújo Daniel F, Ju Se-Jong
Ifremer, CCEM-Unité Contamination Chimique des Écosystèmes Marins (CCEM), F-44000 Nantes, France; Marine Environmental Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of Korea.
Marine Environmental Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of Korea; Department of Ocean Science (Oceanography), KIOST School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
Sci Total Environ. 2025 Jun 15;981:179599. doi: 10.1016/j.scitotenv.2025.179599. Epub 2025 May 6.
This study investigated metal organotropism and ZnCu isotopic compositions in hydrothermal vent mussels (Bathymodiolus sp.) and sea snails (Ifremeria sp. and Alviniconcha sp.). In mussels, bioaccumulation of Al, V, Cr, Mn, Fe, Co, Ni and Zn occurred mainly in the byssus and digestive gland, whereas Cu, As, Ag, Cd, and Pb were found in the gills, suggesting that bioaccumulation of these metals occurs via the respiratory system. In sea snails, the digestive glands tended to have higher metal concentrations than other organs. Zn showed higher intratissue isotope variability than Cu. For Cu isotopes, the digestive glands of vent mollusks had the highest δCu values. However, while Zn concentrations were consistently elevated in the digestive glands, δZn values did not exhibit a corresponding trend. In vent mussels, during sequenced transport or metal partitioning processes after accumulation via the gills and digestive glands, Zn and Cu concentrations decreased with isotopic fractionation, indicating that lighter isotopes are preferentially used. Both sea snail species differed from mussels in that they preferentially accumulated lighter Zn isotopes in the digestive glands with higher Zn content. The metal and isotopic signatures accumulated in the internal organs of hydrothermal vent mollusks suggest species-dependent dietary strategies and mechanisms of uptake, accumulation, and detoxification. Our findings related to the organotropism of Zn and Cu isotopes offer new insights into the bioavailability and bioaccumulation processes of hydrothermal vent mollusks.
本研究调查了热液喷口贻贝（Bathymodiolus属）和海螺（Ifremeria属和Alviniconcha属）中的金属器官亲和性以及锌铜同位素组成。在贻贝中，铝、钒、铬、锰、铁、钴、镍和锌的生物积累主要发生在足丝和消化腺中，而鳃中发现了铜、砷、银、镉和铅，这表明这些金属的生物积累是通过呼吸系统发生的。在海螺中，消化腺中的金属浓度往往高于其他器官。锌在组织内的同位素变异性高于铜。对于铜同位素，热液喷口软体动物的消化腺具有最高的δCu值。然而，虽然消化腺中的锌浓度持续升高，但δZn值并未呈现相应趋势。在热液喷口贻贝中，在通过鳃和消化腺积累后的顺序运输或金属分配过程中，锌和铜的浓度随着同位素分馏而降低，这表明较轻的同位素被优先利用。这两种海螺与贻贝的不同之处在于，它们在锌含量较高的消化腺中优先积累较轻的锌同位素。热液喷口软体动物内脏中积累的金属和同位素特征表明了物种依赖的饮食策略以及摄取、积累和解毒机制。我们关于锌和铜同位素器官亲和性 的研究结果为热液喷口软体动物的生物可利用性和生物积累过程提供了新的见解。
