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首页> 外文期刊>Environmental toxicology and chemistry >EXPOSURE AND EFFECTS OF 2,3,7,8-TETRACHLORODIBENZO-p-DIOXLN IN TREE SWALLOWS (TACHYCINETA BICOLOR) NESTING ALONG THE WOONASQUATUCKET RIVER, RHODE ISLAND, USA
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EXPOSURE AND EFFECTS OF 2,3,7,8-TETRACHLORODIBENZO-p-DIOXLN IN TREE SWALLOWS (TACHYCINETA BICOLOR) NESTING ALONG THE WOONASQUATUCKET RIVER, RHODE ISLAND, USA

机译：美国罗德岛的伍纳夸塔克特河沿岸的树木燕子（T蛾）中的2,3,7,8-四叉基二苯并偶氮-p-DIOXLN的暴露和影响

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摘要

Concentrations of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in tree swallows (Tachycineta bicolor) nesting along the Woonasquatucket River northwest of Providence (RI, USA) in 2000 and 2001 were some of the highest ever reported in avian tissues. Mean concentrations in eggs ranged from 300 to > 1,000 pg/g wet weight at the two most contaminated ponds, Allendale and Lyman. Mean egg concentrations at Greystone, the upstream reference pond, were 12 and 29 pg/g. Positive accumulation rates and concentrations in diet samples from 12-day-old nestlings indicated that the contamination was accumulated locally. Concentrations in diet of between 71 and 219 pg/g wet weight were more than 6 and 18 times higher than concentrations considered safe for birds (10-12 pg/g). Hatching success was negatively associated with concentration of TCDD in eggs. Only about half the eggs hatched at Allendale compared with >77% at Greystone. The national average for hatching success in successful nests is 85%. No other contaminants, such as polychlorinated biphenyls and mercury, were present in any sample at concentrations known to affect avian reproduction. Three bioindicators, half-peak coefficient of geometric variation, ethoxyresorufin-O-dealkylase activity, and brain asymmetry were assessed relative to TCDD contamination.
机译：2000年和2001年，沿着普罗维登斯西北部的伍纳斯夸塔基特河（美国，RI）筑巢的树燕子（Tachycineta bicolor）中的2,3,7,8-四氯二苯并-对-二恶英（TCDD）的浓度是有史以来最高的。鸟类组织。在两个污染最严重的池塘（艾伦代尔和莱曼），鸡蛋的平均浓度介于300到> 1,000 pg / g湿重之间。上游参考池塘Greystone的平均卵浓度为12和29 pg / g。来自12天大的雏鸟的饮食样本中的正积累率和浓度都表明，污染物是局部积累的。日粮中湿重在71至219 pg / g之间的浓度比对禽类安全的浓度（10-12 pg / g）高出6至18倍。孵化成功与鸡蛋中TCDD浓度负相关。在艾伦代尔孵化的鸡蛋大约只有一半，而在格雷斯通孵化的鸡蛋> 77％。全国成功孵化成功的平均值为85％。任何样品中均不存在已知影响禽类繁殖的其他污染物，例如多氯联苯和汞。相对于TCDD污染，评估了三个生物指标，半峰形几何变异系数，乙氧基异佛灵-O-脱烷基酶活性和脑不对称性。

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