幼崽接触汞：追踪生活在东南太平洋的南美毛海豹（Arctocephalus australis）和南美海狮（Otaria byronia）的早期接触。

IF 4.1 2区环境科学与生态学 Q1 MARINE & FRESHWATER BIOLOGY

Aquatic Toxicology Pub Date : 2025-03-14 DOI:10.1016/j.aquatox.2025.107325

I. Peña-Galindo , B. Bernales-Santolaya , F. Montalva , J. Gutiérrez , F. Quesada-Alvarado , S. Navarrete-Quintanilla , V. Robbins , D.J. Perez-Venegas , G. Cortés-Hinojosa , M. Seguel , G. Chiang

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引用次数: 0

摘要

汞以三种形式存在：元素汞、无机汞和有机汞，其中甲基汞（MeHg）最为令人担忧，因为它具有跨越细胞屏障和生物积累的能力，特别是在海洋哺乳动物中，其中90%以上的汞以甲基汞形式存在。尽管它很重要，但关于南半球海洋哺乳动物体内汞的生物积累和母体转移机制的数据有限。鳍足动物作为海洋哨兵，由于其生态和生物特性，在监测污染物方面具有重要价值。本研究调查了南美海狮（SASL）和南美毛海豹（SAFS）的汞负担和母体汞转移。分析了SASL幼崽的血块和触须样本以及SAFS幼崽和母崽的血块和乳汁样本。血凝块中SASL总汞（THg）含量为8.36 ~ 305.43 μg/Kg d.w.，肉苁茸中THg含量为3071.8 ~ 28,034.5 μg/Kg d.w.。在SAFS中，THg含量在0.40 ~ 358.77 μg/Kg w.w.之间，在乳汁中含量在3.4 ~ 14.1 μg/Kg w.w.之间。两种幼崽之间存在显著差异，SAFS幼崽与母崽的THg含量和SASL幼崽的THg含量与乳鼠的THg含量呈正相关，表明母体在妊娠期间发生了转移。此外，sas幼崽THg水平随时间下降，提示生物稀释。这些物种使我们能够在两个殖民地和智利的两个不同地区进行长期监测，这些发现与粮食安全和重金属污染的处理有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Pups on mercury: Tracking early life exposure on South American fur seals (Arctocephalus australis) and South American sea lions (Otaria byronia) in the Southeastern Pacific

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Pups on mercury: Tracking early life exposure on South American fur seals (Arctocephalus australis) and South American sea lions (Otaria byronia) in the Southeastern Pacific

Mercury exists in three forms: elemental, inorganic, and organic, with methylmercury (MeHg) being the most concerning due to its ability to cross cellular barriers and bioaccumulate, particularly in marine mammals, where over 90 % of total mercury is in the MeHg form. Despite its importance, there is limited data on mercury bioaccumulation in marine mammals and maternal transfer mechanisms in the Southern Hemisphere. Pinnipeds, as ocean sentinels, are valuable for monitoring contaminants due to their ecological and biological traits. This study investigates mercury burdens and maternal transfer of mercury in South American sea lions (SASL) and South American fur seals (SAFS). Samples of clots and vibrissae from SASL pups and clots and milk from SAFS pups and females were analyzed. Total mercury (THg) levels in SASL ranged from 8.36 to 305.43 μg/Kg w.w. in clots and from 3071.8 to 28,034.5 μg/Kg d.w. in vibrissae. In SAFS, THg levels in clots ranged from 0.40 to 358.77 μg/Kg w.w. and in milk from 3.4 to 14.1 μg/Kg w.w. Significant differences were observed between newborn pups of both species, with a positive correlation between THg levels in clots from SAFS pups and females and between clots and vibrissae in SASL pups, indicating maternal transfer during gestation. Additionally, THg levels in SAFS pups decreased over time, suggesting biodilution. These species allow us to have a long term monitoring in both colonies and two different areas in Chile and are relevant findings to food security and the treatment of heavy metal contamination.

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来源期刊

Aquatic Toxicology 环境科学-毒理学

CiteScore

7.10

自引率

4.40%

发文量

250

审稿时长

56 days

期刊介绍： Aquatic Toxicology publishes significant contributions that increase the understanding of the impact of harmful substances (including natural and synthetic chemicals) on aquatic organisms and ecosystems. Aquatic Toxicology considers both laboratory and field studies with a focus on marine/ freshwater environments. We strive to attract high quality original scientific papers, critical reviews and expert opinion papers in the following areas: Effects of harmful substances on molecular, cellular, sub-organismal, organismal, population, community, and ecosystem level; Toxic Mechanisms; Genetic disturbances, transgenerational effects, behavioral and adaptive responses; Impacts of harmful substances on structure, function of and services provided by aquatic ecosystems; Mixture toxicity assessment; Statistical approaches to predict exposure to and hazards of contaminants The journal also considers manuscripts in other areas, such as the development of innovative concepts, approaches, and methodologies, which promote the wider application of toxicological datasets to the protection of aquatic environments and inform ecological risk assessments and decision making by relevant authorities.