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美洲短吻鳄(密西西比鳄)体内微量元素的生物分布

Trace element biodistribution in the American alligator (Alligator mississippiensis).

作者信息

Nilsen Frances M, Kassim Brittany L, Delaney J Patrick, Lange Ted R, Brunell Arnold M, Guillette Louis J, Long Stephen E, Schock Tracey B

机构信息

National Institute of Standards and Technology (NIST), Hollings Marine Laboratory, Charleston, SC 29412, USA; Department of Obstetrics and Gynecology and Marine Biomedicine and Environmental Sciences, Medical University of South Carolina (MUSC), Charleston, SC 29425-6190, USA.

National Institute of Standards and Technology (NIST), Hollings Marine Laboratory, Charleston, SC 29412, USA.

出版信息

Chemosphere. 2017 Aug;181:343-351. doi: 10.1016/j.chemosphere.2017.04.102. Epub 2017 Apr 23.

Abstract

Routine monitoring of contaminant levels in wildlife is important for understanding chemical exposure and ultimately the link to ecosystem and human health. This is particularly important when the monitored species is recreationally hunted for human consumption. In the southeastern United States, recreational alligator harvesting takes place annually and in locations that are known to be contaminated with environmental pollutants. In this study, we investigated the biodistribution of trace elements in the American alligator (Alligator mississippiensis) from five sites in Florida, USA. These sites are locations where annual recreational alligator harvesting is permitted and two of the sites are identified as having high mercury contamination with human consumption advisories in effect. We utilized routinely collected monitoring samples (blood and scute), a commonly consumed tissue (muscle), and a classically analyzed tissue for environmental contaminants (liver) to demonstrate how the trace elements were distributed within the American alligator. We describe elemental tissue compartmentalization in an apex predator and investigate if noninvasive samples (blood and scute) can be used to estimate muscle tissue concentrations for a subset of elements measured. We found significant correlations for Hg, Rb, Se, Zn and Pb between noninvasive samples and consumed tissue and also found that Hg was the only trace metal of concern for this population of alligators. This study fills a gap in trace elemental analysis for reptilian apex predators in contaminated environments. Additionally, comprehensive elemental analysis of routinely collected samples can inform biomonitoring efforts and consumption advisories.

摘要

对野生动物体内污染物水平进行常规监测,对于了解化学物质暴露情况以及最终了解其与生态系统和人类健康之间的联系至关重要。当被监测物种是供人类食用的休闲狩猎对象时,这一点尤为重要。在美国东南部,每年都会在已知受到环境污染物污染的地点进行休闲短吻鳄捕捞活动。在本研究中,我们调查了来自美国佛罗里达州五个地点的美洲短吻鳄(密西西比鳄)体内微量元素的生物分布情况。这些地点是允许进行年度休闲短吻鳄捕捞的地方,其中两个地点被确定汞污染严重,且发布了针对人类食用的相关建议。我们利用常规收集的监测样本(血液和盾片)、一种常见的食用组织(肌肉)以及一种用于环境污染物经典分析的组织(肝脏),来展示微量元素在美国短吻鳄体内的分布情况。我们描述了顶级捕食者体内元素的组织分区情况,并研究非侵入性样本(血液和盾片)是否可用于估计所测部分元素在肌肉组织中的浓度。我们发现非侵入性样本与食用组织中的汞、铷、硒、锌和铅之间存在显著相关性,并且还发现汞是这群短吻鳄唯一值得关注的微量金属。本研究填补了受污染环境中爬行动物顶级捕食者微量元素分析方面的空白。此外,对常规收集样本进行全面的元素分析可为生物监测工作和食用建议提供参考。

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