Intraspecific Variation in Mercury Contamination of Alligator Snapping Turtles (Macrochelys temminckii)

IF 3.6 4区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES Environmental Toxicology and Chemistry Pub Date : 2024-05-28 DOI:10.1002/etc.5888

David Rosenbaum, Carmen G. Montaña, Yanli Zhang, Matthew M. Chumchal, Daniel Saenz, Christopher M. Schalk

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Abstract

Macrochelys temminckii (alligator snapping turtle) is an aquatic turtle endemic to the southeastern United States that was proposed for listing under the Endangered Species Act in 2021. In the present study we analyzed total mercury (THg) concentrations in skeletal muscle, tail clips, and nail tissue of 93 M. temminckii sampled from 14 waterbodies in eastern Texas (USA). Our objectives were to assess (1) the degree of correlation between internal tissue (skeletal muscle and tail clip samples) and keratin (nail samples), (2) the influence of ecological factors (turtle size and waterbody/sampling site) on THg concentrations, and (3) whether THg concentrations were high enough to pose a risk to human consumers. The mean (±SE) THg concentrations of muscle and nail were 1.16 ± 0.08 μg/g dry weight and 4.21 ± 0.24 μg/g dry weight, respectively, and THg concentrations were highly dependent on the sampling site. The THg concentrations of nails were correlated with muscle concentrations (R² = 0.56, p < 0.001). The effect of body size on THg concentrations varied by sampling site, indicating that size is not a good predictor of Hg concentration across sites. Finally, THg concentrations in M. temminckii of eastern Texas were high enough to pose a potential risk to human health based on US Environmental Protection Agency dietary guidelines. Environ Toxicol Chem 2024;43:1903–1913. © 2024 SETAC. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.

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鳄鱼鳄龟（Macrochelys temminckii）汞污染的种内差异。

Macrochelys temminckii（鳄鱼鳄龟）是美国东南部特有的一种水龟，2021年被建议列入《濒危物种法案》。在本研究中，我们分析了从美国得克萨斯州东部 14 个水体中采样的 93 只鳄龟骨骼肌、尾夹和指甲组织中的总汞浓度（THg）。我们的目标是评估：（1）内部组织（骨骼肌和尾夹样本）与角蛋白（指甲样本）之间的相关程度；（2）生态因素（龟的大小和水体/采样地点）对总汞浓度的影响；（3）总汞浓度是否高到足以对人类消费者构成风险。肌肉和指甲的三卤甲烷平均浓度（±SE）分别为 1.16 ± 0.08 μg/g 干重和 4.21 ± 0.24 μg/g 干重，三卤甲烷浓度与采样地点有很大关系。指甲中的四氢大麻酚浓度与肌肉中的四氢大麻酚浓度相关（R2 = 0.56，p＜0.05）。

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来源期刊

Environmental Toxicology and Chemistry 环境科学-毒理学

CiteScore

7.40

自引率

9.80%

发文量

265

审稿时长

3.4 months

期刊介绍： The Society of Environmental Toxicology and Chemistry (SETAC) publishes two journals: Environmental Toxicology and Chemistry (ET&C) and Integrated Environmental Assessment and Management (IEAM). Environmental Toxicology and Chemistry is dedicated to furthering scientific knowledge and disseminating information on environmental toxicology and chemistry, including the application of these sciences to risk assessment.[...] Environmental Toxicology and Chemistry is interdisciplinary in scope and integrates the fields of environmental toxicology; environmental, analytical, and molecular chemistry; ecology; physiology; biochemistry; microbiology; genetics; genomics; environmental engineering; chemical, environmental, and biological modeling; epidemiology; and earth sciences. ET&C seeks to publish papers describing original experimental or theoretical work that significantly advances understanding in the area of environmental toxicology, environmental chemistry and hazard/risk assessment. Emphasis is given to papers that enhance capabilities for the prediction, measurement, and assessment of the fate and effects of chemicals in the environment, rather than simply providing additional data. The scientific impact of papers is judged in terms of the breadth and depth of the findings and the expected influence on existing or future scientific practice. Methodological papers must make clear not only how the work differs from existing practice, but the significance of these differences to the field. Site-based research or monitoring must have regional or global implications beyond the particular site, such as evaluating processes, mechanisms, or theory under a natural environmental setting.

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