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首页> 外文期刊>Environmental toxicology and chemistry >SPATIAL TRENDS OF PERFLUOROALKYL COMPOUNDS IN RINGED SEALS (PHOCA HISPIDA) FROM THE CANADIAN ARCTIC
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SPATIAL TRENDS OF PERFLUOROALKYL COMPOUNDS IN RINGED SEALS (PHOCA HISPIDA) FROM THE CANADIAN ARCTIC

机译：加拿大北极圈环海豹（Phoca HISPIDA）中全氟烷基化合物的空间趋势

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摘要

The present study examined spatial trends of perfluoroalkyl compounds (PFCs) in liver samples from 11 populations of ringed seals (Phoca hispida) in the Canadian Arctic from 2002 to 2005. Trophic position and relative carbon sources were compared by analyzing stable nitrogen and carbon isotopes in muscle samples. Geometric mean concentrations of total C_9-C_(15) perfluorinated carboxylates (PFCAs) ranged from 8.8 to 84 ng/g wet weight, and C_9-C_(11) PFCAs predominated. Perfluorooctane sulfonate was the dominant PFC measured, with concentrations ranging from 6.5 to 89 ng/g wet weight, contributing between 29 and 56% of the total PFC concentration. Overall, mean PFC concentrations were similar between populations, and differences were attributed largely to elevated levels in the Gjoa Haven (Rae Strait, central Canadian Arctic archipelago) and Inukjuak populations (eastern Hudson Bay) and to lower concentrations at Pangnirtung (Cumberland Sound, Baffin Island). Mean stable nitrogen isotope ratios (±95% confidence intervals) ranged from 14.7‰ (±0.3‰) at Nain (Labrador) to 17.9‰ (±0.7‰) at Gjoa Haven, suggesting that all populations were within the same trophic level. Stable carbon isotope ratios varied widely between the seal populations, ranging from -22.9‰ (±0.2‰) at Gjoa Haven to -17.7‰ (±0.4‰) at Nain. The δ~(13)C ratios from Gjoa Haven were significantly more depleted than those for other populations and may suggest a terrestrially based carbon source. The depleted stable carbon isotope ratio may explain the elevated PFC concentrations in the Gjoa Haven population. Analysis of covariance indicated that δ~(13)C was a significant covariable for seven of nine seal populations for which δ~(13)C values were available. After adjusting for δ~(13)C values, concentrations of most PFCs generally were statistically greater in the Grise Fiord, Qikiqtarjuaq, Arviat, and Nain populations.
机译：本研究调查了2002年至2005年加拿大北极地区11个环斑海豹（Phoca hispida）肝脏样本中全氟烷基化合物（PFC）的空间趋势。通过分析稳定的氮和碳同位素，比较了营养位置和相对碳源。肌肉样本。总C_9-C_（15）全氟羧酸盐（PFCA）的几何平均浓度范围为8.8至84 ng / g湿重，并且以C_9-C_（11）PFCA为主导。全氟辛烷磺酸盐是测定的主要PFC，浓度范围为6.5至89 ng / g湿重，占PFC总浓度的29％至56％。总体而言，不同人群之间的平均PFC浓度相似，差异主要归因于Gjoa Haven（加拿大中部北极群岛的雷海峡）和Inukjuak人群（哈德逊湾东部）的水平升高，以及Pangnirtung（Cumberland Sound，Baffin）的较低水平岛）。平均稳定氮同位素比率（±95％置信区间）在奈恩（拉布拉多）的14.7‰（±0.3‰）到Gjoa Haven的17.9‰（±0.7‰）不等，表明所有种群都在相同的营养水平内。海豹种群之间的稳定碳同位素比率差异很大，从Gjoa Haven的-22.9‰（±0.2‰）到Nain的-17.7‰（±0.4‰）。 Gjoa Haven的δ〜（13）C比值明显比其他人群少，可能表明是陆地碳源。稳定的碳同位素比率耗尽可能解释了Gjoa Haven人群中PFC浓度升高。协方差分析表明，对于可获得δ〜（13）C值的9个海豹种群中的7个，δ〜（13）C是显着的协变量。在调整了δ〜（13）C值后，格里斯峡湾，奇基科塔华（Qikiqtarjuaq），阿尔维亚（Naviat）和奈因（Nain）人群中大多数PFC的浓度通常在统计学上较高。

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