کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4433582 | 1619961 | 2007 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Trace element concentrations in the Pacific harbor seal (Phoca vitulina richardii) in central and northern California
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
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![عکس صفحه اول مقاله: Trace element concentrations in the Pacific harbor seal (Phoca vitulina richardii) in central and northern California Trace element concentrations in the Pacific harbor seal (Phoca vitulina richardii) in central and northern California](/preview/png/4433582.png)
چکیده انگلیسی
To determine concentrations of trace elements (THg, MeHg, Se, and Pb) in tissues of the Pacific harbor seal (Phoca vitulina richardii), live (n = 186) and dead seals (n = 53) were sampled throughout central and northern California from March 2003 to January 2005. There were significant differences in THg concentrations in blood and hair based on age (p < 0.001). Adult male harbor seals had greater THg concentrations in their hair than adult female harbor seals (p < 0.003). THg concentrations in liver increased linearly with age and δ15N (p < 0.001); whereas, MeHg concentrations in liver increased exponentially until approximately 5 years of age with an asymptote at 1.3 μg/g wet weight. MeHg expressed as a percentage of THg (%MeHg) was best described by a decay function (r2 = 0.796, p < 0.001), decreasing to a minimum at 4 years of age. Hepatic Se increased with age and was in equimolar ratios with THg in adults; whereas, molar ratio of Se:THg in pups deviated from a 1:1 ratio. Significant differences among study locations in THg concentrations in blood and hair were not detected. Assessing the possible effect of sampling location on Hg concentrations, however, was confounded and limited by lack of equal sample sizes for basic age and sex cohorts, a common dilemma in pinniped research.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 372, Issues 2â3, 1 January 2007, Pages 676-692
Journal: Science of The Total Environment - Volume 372, Issues 2â3, 1 January 2007, Pages 676-692
نویسندگان
Tiffini J. Brookens, James T. Harvey, Todd M. O'Hara,