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Relationship between mercury and selenium concentrations in tissues from stranded odontocetes in the northern Gulf of Mexico

机译：墨西哥湾北部血管血液中汞与硒浓度的关系

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Odontocetes are apex predators that, despite accumulating mercury (Hg) to high concentrations in their tissues, show few signs of Hg toxicity. One method of Hg detoxification in odontocetes includes the sequestering of Hg in toxicologically inert mercury selenide (HgSe) compounds. To explore the tissue-specific accumulation of Hg and Se and the potential protective role of Se against Hg toxicity, we measured the concentrations of total mercury (THg) and selenium (Se) in multiple tissues from 11 species of odontocetes that stranded along the northern Gulf of Mexico coast [Florida (FL) and Louisiana (LA)]. Tissues were collected primarily from bottlenose dolphins (Tursiops trunca-tus; n = 93); however, individuals from species in the following 8 genera were also sampled: Feresa (n = 1), Globicephala (n = 1), Grampus (n = 2), Kogia (n = 5), Mesoplodon (n = 1), Peponocephala (n = 4), Stenella (n = 9), and Steno (n = 1). In all species, mean THg concentrations were greatest in the liver and lowest in the blubber, lung, or skin. In contrast, in most species, mean Se concentrations were greatest in the liver, lung, or skin, and lowest in the blubber. For all species combined, Se:Hg molar ratios decreased with increasing THg concentration in the blubber, kidney, liver, lung, and skin following an exponential decay relationship. In bottlenose dolphins, THg concentrations in the kidney, liver, and lung were significantly greater in FL dolphins compared to LA dolphins. On average, in bottlenose dolphins, Se:Hg molar ratios were approximately 1∶1 in the liver and ＞1∶1 in blubber, kidney, lung, and skin, suggesting that Se likely protects against Hg toxicity. However, more research is necessary to understand the variation in Hg accumulation within and among species and to assess how Hg, in combination with other environmental stressors, influences odontocete population health.
机译：Odontocetes是Apex捕食者，尽管累积汞（Hg）在其组织中累积到高浓度​​，但表现出少数Hg毒性的迹象。 Odontocetes中的一种HG解毒方法包括毒理学惰性汞硒（Hgse）化合物的Hg螯合。为了探讨HG和Se的组织特异性积累以及SE对HG毒性的潜在保护作用，我们测量了沿着北部滞留的11种异常的多种组织中总汞（THG）和硒（SE）的浓度墨西哥海岸湾[佛罗里达（佛罗里达州）和路易斯安那州（La）]。组织主要来自瓶胎海豚（Tursiops trunca-tus; n = 93）;然而，在以下8个属中的种类是取样的：Feresa（n = 1），Globicephala（n = 1），Grampus（n = 2），kogia（n = 5），mesoplodon（n = 1），peponocephala （n = 4），Stenella（n = 9）和steno（n = 1）。在所有物种中，平均值浓度在肝脏中最大，但肺部，肺或皮肤中最低。相比之下，在大多数物种中，肝脏，肺或皮肤中的意思是最大的浓度，并且在扁平机中最低。对于所有物种组合，SE：Hg摩尔比随着百分比衰减关系的增加，肾脏，肝脏，肺和皮肤增加，较高浓度降低。与La海豚相比，肾脏，肝脏和肺中的肾脏，肝脏和肺中的THG浓度明显更大。平均而言，在瓶颈海豚中，SE：Hg摩尔比在肝脏中约1:1，肾脏，肾，肺和皮肤中> 1:1，表明SE可能会保护Hg毒性。然而，需要更多的研究来了解物种内部和中间的HG积累的变化，并评估HG如何与其他环境压力源相结合，影响Ofontocete人口健康。

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    《Oceanographic Literature Review》 |2020年第10期|2246-2246|共1页
  • 作者

    M.A. McCormack; B.P. Jackson; J. Dutton;

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    Department of Biology Texas State University Aquatic Station 601 University Drive San Marcos TX 78666 United States;

    Department of Biology Texas State University Aquatic Station 601 University Drive San Marcos TX 78666 United States;

    Department of Biology Texas State University Aquatic Station 601 University Drive San Marcos TX 78666 United States;

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