Jeffree Conservation and Research, 45 Casuarina Road, Alfords Point, NSW 2234, Australia.
IAEA Environment Laboratories, 4 Quai Antoine, MC 98000, Monaco.
Mar Pollut Bull. 2024 May;202:116291. doi: 10.1016/j.marpolbul.2024.116291. Epub 2024 Mar 30.
Dogfish (Scyliorhinus canicula) transferred trace elements (Ag, Cd, Mn and Se) from their diet to eggs, and their components (yolk and embryo, case and jelly) at greatly varying rates. Trace element levels in eggs showed positive linear relationships (p < 0.001; r-0.83-0.91) with their cumulative rates of maternal ingestion over 61 days (maternal-to-egg transfer rates: mTFs). These mTFs varied by 2-3 orders of magnitude, with Mn > Ag > Se > Cd, and their range encompassed those previously measured for Co, Zn, Am and Cs. For six of the eight trace elements, their mTFs were significantly influenced (p < 0.05; r = 0.72) by both their dietary assimilation efficiency and their location within the egg (case). In contrast, both Ag and Mn greatly exceeded the mTFs predicted by this multiple regression model by one and 2-3 orders of magnitude, respectively, and were predominantly transferred to the egg case. Among elements, contrasting rates of transfer and percentage distributions in egg components imply differing ecotoxicological and radiological detriments to the developing embryo.
狗鲨（棘鲨）将痕量元素（Ag、Cd、Mn 和 Se）从其饮食中转移到卵中，并以不同的速度转移到其成分（蛋黄和胚胎、壳和果冻）中。卵中的痕量元素水平与其在 61 天内的母体摄入累积率呈正线性关系（p < 0.001；r-0.83-0.91）（母体向卵转移率：mTFs）。这些 mTFs 的变化幅度为 2-3 个数量级，其中 Mn > Ag > Se > Cd，其范围包括之前测量的 Co、Zn、Am 和 Cs。对于这八种痕量元素中的六种，其 mTFs 受到饮食同化效率及其在卵内位置（壳）的显著影响（p < 0.05；r = 0.72）。相比之下，Ag 和 Mn 分别比此多元回归模型预测的 mTFs 高出一个和 2-3 个数量级，主要转移到卵壳。在元素中，转移率和卵成分中百分比分布的差异表明对发育中的胚胎具有不同的生态毒理学和放射性危害。
