Mercury Concentrations in Two Populations of the most Endangered Dolphin (Pontoporia blainvillei) from the Southwestern Atlantic Ocean.

IF 2.7 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Bulletin of Environmental Contamination and Toxicology Pub Date : 2024-06-01 DOI:10.1007/s00128-024-03904-y
Emi Brinatti Guari, Monizze Vannuci-Silva, Bárbara M R Manhães, Eduardo Resende Secchi, Silvina Botta, Carolina Pacheco Bertozzi, Elitieri Batista Santos-Neto, Carolina Pereira Dias, Alexandre de Freitas Azevedo, Tatiana Lemos Bisi, Haydée Andrade Cunha, José Lailson-Brito
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Abstract

Mercury contamination has been aggravated by emerging environmental issues, such as climate change. Top predators present concerning Hg concentrations once this metal bioaccumulates and biomagnifies. This study evaluated total mercury (THg) concentrations in tissues of 43 franciscanas (Pontoporia blainvillei) from two populations: the Franciscana Management Area (FMA) IIb and FMA IIIa. Animals from FMA IIIa showed mean concentration 5-times and 2.5-times higher in the liver and kidney (4.73 ± 6.84 and 0.52 ± 0.51 µg.g-1, w.w., respectively) than individuals from FMA IIb (0.89 ± 1.04 and 0.22 ± 0.15 µg.g-1, w.w., respectively). This might be due to: (I) individuals sampled from FMA IIIa being larger and older, and/or (II) the area near FMA IIIa presents environmental features leading to higher THg availability. Coastal contamination can affect franciscanas' health and population maintenance at different levels depending on their life history and, therefore, it should be considered to guide specific conservation actions.

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西南大西洋最濒危海豚(Pontoporia blainvillei)两个种群的汞浓度。
气候变化等新出现的环境问题加剧了汞污染。一旦这种金属发生生物累积和生物放大作用,顶级食肉动物体内的汞浓度就会令人担忧。本研究评估了来自两个种群(弗朗西斯卡管理区 IIb 和弗朗西斯卡管理区 IIIa)的 43 只弗朗西斯卡(Pontoporia blainvillei)组织中的总汞(THg)浓度。来自 FMA IIIa 的动物肝脏和肾脏中的平均浓度(分别为 4.73 ± 6.84 和 0.52 ± 0.51 µg.g-1(湿重))比来自 FMA IIb 的个体(分别为 0.89 ± 1.04 和 0.22 ± 0.15 µg.g-1(湿重))高出 5 倍和 2.5 倍。这可能是由于(I)从 FMA IIIa 取样的个体更大、更老,和/或(II)FMA IIIa 附近地区的环境特征导致三卤甲烷含量更高。海岸污染会根据不同的生活史在不同程度上影响法氏金眼鲷的健康和种群维持,因此,在指导具体保护行动时应考虑到这一点。
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来源期刊
CiteScore
5.60
自引率
3.70%
发文量
230
审稿时长
1.7 months
期刊介绍: The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.
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