AUT Lab for Cephalopod Ecology & Systematics, School of Science, Auckland University of Technology, Private Bag 92006, 1142 Auckland, New Zealand.
Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS-La Rochelle Université, 2 rue Olympe de Gouges, 17000 La Rochelle, France; Institut Universitaire de France (IUF), 1 rue Descartes, 75005 Paris, France.
Sci Total Environ. 2021 May 10;768:144373. doi: 10.1016/j.scitotenv.2020.144373. Epub 2020 Dec 26.
Despite the Antarctic Ocean being considered a pristine environment, elevated trace element concentrations have been reported in many marine organisms. The Antarctic Ocean is particularly vulnerable to climate change, which can also affect the bioaccumulation of trace element concentrations in biota. While Antarctic octopods are key components of the regional food webs as prey for a variety of predators (e.g., seals, fish, and seabirds), their contamination state by trace elements remains largely unknown. This study investigated the trace element concentrations in relation to the trophic ecology in Antarctic octopods. Stable isotope values (δC and δN) and trace element concentrations (Ag, As, Cd, Co, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, V, and Zn) were measured in eight different species (Adelieledone polymorpha, Pareledone aequipapillae, P. albimaculata, P. aurata, P. charcoti, P. cornuta, P. felix, and P. turqueti) sampled near Elephant Island, close to the Antarctic Peninsula. Stable isotopes of δN varied among species, with significant differences between A. polymorpha and P. aurata suggesting potential niche segregation. Trace element concentrations also differed among species and with sampling depth, which likely reflects their trophic ecology. The data presented in this study provides the first insight into the trace element concentrations for these endemic octopods in this vulnerable habitat and their stable isotope values.
尽管南极海洋被认为是原始环境，但许多海洋生物中都报告了微量元素浓度升高的情况。南极海洋特别容易受到气候变化的影响，气候变化也会影响生物体内微量元素浓度的生物累积。南极章鱼作为区域食物网的关键组成部分，是各种捕食者（如海豹、鱼类和海鸟）的猎物，但它们受微量元素污染的状况在很大程度上仍不清楚。本研究调查了与南极章鱼营养生态有关的微量元素浓度。在靠近南极半岛的象岛附近，对 8 种不同物种（Adelieledone polymorpha、Pareledone aequipapillae、P. albimaculata、P. aurata、P. charcoti、P. cornuta、P. felix 和 P. turqueti）进行了稳定同位素值（δC 和 δN）和微量元素浓度（Ag、As、Cd、Co、Cr、Cu、Fe、Hg、Mn、Ni、Pb、Se、V 和 Zn）的测量。不同物种的δN 稳定同位素存在差异，A. polymorpha 和 P. aurata 之间存在显著差异，表明可能存在生态位隔离。微量元素浓度也因物种和采样深度而异，这可能反映了它们的营养生态。本研究提供了这些脆弱生境中特有章鱼的微量元素浓度及其稳定同位素值的首次见解。
