Maternal transfer of selenium in Alligator mississippiensis nesting downstream from a coal-burning power plant
Maternal transfer of selenium in Alligator mississippiensis nesting downstream from a coal-burning power plant
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DOI：
10.1897/03-520
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发表时间：
2004-08-01
影响因子：
4.1
通讯作者：
Jackson, BP
中科院分区：
文献类型：
--
作者：
Roe, JH;Hopkins, WA;Jackson, BP
硒（Se）对许多卵生脊椎动物具有胚胎毒性，但人们对硒的母体转移及其对爬行动物的影响知之甚少。在四年的时间里，我们从受硒污染地点的一个巢穴中收集了三窝美洲短吻鳄（密西西比短吻鳄）的卵，并将该巢穴与污染地点下游的巢穴（两个巢穴中的两窝）和参考地点（两个巢穴中的两窝）的卵和幼体硒浓度和窝活力进行了比较。与参考巢穴（1.4-2.3 ppm 和 67-74% 活力）相比，硒污染地点巢穴和下游巢穴的卵和幼体的硒浓度升高（2.1-7.8 ppm），活力降低（30-54%），但硒浓度没有超过为其他卵生脊椎动物建立的生殖毒性阈值。来自硒污染地点的卵的绒毛尿囊膜中的硒浓度较高，表明该组织可用作密西西比猴胚胎硒暴露的无损指标。对这些数据的检查表明，有必要对暴露于过量硒的鳄鱼胚胎的吸收、积累和繁殖成功率进行进一步研究。
Selenium (Se) is embryotoxic in many oviparous vertebrates, but little is known about maternal transfer of Se and its impact in reptiles. Over a four-year period, we collected three clutches of eggs of the American alligator (Alligator mississippiensis) from a single nest at a site contaminated with Se and compared egg and hatchling Se concentrations and clutch viability from this nest to nests downstream from the contaminated site (two clutches from two nests) and at a reference site (two clutches from two nests). Eggs and hatchlings from the nest at the Se-contaminated site and downstream nests had elevated Se concentrations (2.1-7.8 ppm) and lower viability (30-54%) compared to reference nests (1.4-2.3 ppm and 67-74% viability), but Se concentrations did not exceed reproductive toxicity thresholds established for other oviparous vertebrates. Selenium concentrations were higher in chorioallantoic membranes of eggs from Se-contaminated sites, suggesting that this tissue may be useful as a nondestructive index of Se exposure for embryos of A. mississippiensis. Examination of these data suggests that further studies on uptake, accumulation, and reproductive success of crocodilian embryos exposed to excessive Se are warranted.