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首页> 外文学位 >Atrazine exposure and reproductive function of ranid frog species collected in Michigan.
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Atrazine exposure and reproductive function of ranid frog species collected in Michigan.

机译：在密歇根州收集的r蛙物种的At去津暴露量和生殖功能。

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The triazine herbicide atrazine has been suggested to be a potential disruptor of normal sexual development in male frogs. The goals of this study were to collect native ranid frogs from agricultural and non-agricultural areas and examine gonadal gross morphological and histology, plasma steroid hormone concentrations and aromatase activity. Liver enzyme activities were also measured to determine whether atrazine exposure affected enzymes functioning in hormone metabolism.; Juvenile and adult green frogs (Rana clamitans), bullfrogs (R. catesbeiana) and leopard frogs (R. pipiens) were collected in the summers of 2002 and 2003 from agricultural and non-agricultural areas in south central Michigan. Atrazine concentrations were below the limit of quantification at most non-agricultural sites. Concentrations did not exceed 2 mug/L at most agricultural sites. One concentration of 250 mug atrazine/L was measured once at one site in 2002. Hermaphroditic individuals were found at a low incidence at both non-agricultural and agricultural sites in both adults and juveniles. Testicular oocytes (TOs) were found in frogs at most of the sites, with the highest incidence occurring in juvenile leopard frogs. TO incidence was significantly different between agricultural and non-agricultural sites in juveniles in 2003, and was correlated with atrazine concentrations. Neither the incidence of hermaphroditism nor TO incidence was correlated with atrazine exposure in the other adults and juveniles collected.; Plasma steroid concentrations varied among locations. Aromatase activity was measurable in less than 11% of testes in adult males, and less than 4% of testes in juvenile males. Aromatase activities were up to 2.5-fold higher in juvenile than adult females. No relationships were found between atrazine concentrations measured in water at the sites and the hormone parameters measured. LSI values in adult male frogs were significantly greater at agricultural sites. Atrazine concentrations were significantly and negatively correlated with MROD activity in adult male green frogs. LSI and EROD and MROD activities were not significantly correlated with atrazine concentrations in adult female or juvenile green frogs.; The results of this study indicate that atrazine exposure is not correlated with gross morphological or histological gonad abnormalities or with an increase in aromatase activity in male ranid frogs.
机译：三嗪除草剂at去津被认为是雄性青蛙正常性发育的潜在破坏者。这项研究的目的是收集来自农业和非农业地区的本地蛙蛙，并检查性腺的总体形态和组织学，血浆类固醇激素浓度和芳香化酶活性。还测定了肝酶活性以确定阿特拉津暴露是否影响激素代谢中起作用的酶。 2002年和2003年夏季，从密歇根州中南部的农业和非农业地区收集了幼蛙和成年蛙（Rana clamitans），牛蛙（R. catesbeiana）和豹蛙（R. pipiens）。在大多数非农业场所，去津浓度均低于定量极限。在大多数农业场所，浓度不超过2杯/升。 2002年在一个地点一次测量了250杯阿特拉津/ L的浓度。在非农业和农业地点，成年和未成年人中雌雄同体个体的发病率很低。在大多数位置的青蛙中都发现了睾丸卵母细胞（TOs），在豹豹中的发病率最高。 2003年青少年农业场所和非农业场所的TO发生率显着不同，并且与阿特拉津的含量相关。雌雄同体的发病率和TO的发病率均与所收集的其他成年人和少年中at去津的暴露量无关。血浆类固醇浓度随位置而异。在成年男性中，不到11％的睾丸中可测量出芳香酶活性，在未成年男性中，不到4％的睾丸中可测量出芳香酶活性。青少年的芳香酶活性比成年雌性高2.5倍。在现场测得的水中r去津浓度与激素参数之间没有关系。在农业场所，成年雄蛙的LSI值明显更高。成年雄性绿蛙中去津浓度与MROD活性呈显着负相关。 LSI，EROD和MROD活性与成年雌性或幼年绿蛙中at去津的含量没有显着相关。这项研究的结果表明，at去津的暴露与雄性蛙的总体形态或组织性腺异常或芳香化酶活性的增加无关。

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