کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4424507 1619196 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mercury and methylmercury bioaccumulation by polychaete worms is governed by both feeding ecology and mercury bioavailability in coastal mudflats
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Mercury and methylmercury bioaccumulation by polychaete worms is governed by both feeding ecology and mercury bioavailability in coastal mudflats
چکیده انگلیسی

Polychaete worms are abundant in many mudflats but their importance to coastal food web Hg biomagnification is not known. We sampled sediments and polychaete worms from mudflats in the Bay of Fundy to investigate the bioaccumulation of mercury (Hg) and methylmercury (MeHg) in the coastal invertebrate food web. Hg concentrations in the sediments were low (<20 μg kg−1). Labile Hg (methanol/KOH sediment extraction) in surface sediments (0–1 cm) was positively correlated with Hg bioaccumulation by surface sediment-ingesting polychaetes but, surprisingly, there was a negative correlation between δ15N (i.e. trophic level) and THg bioaccumulation factors in polychaete worms. Worms feeding on deeper sediments contained the greatest MeHg concentrations (69.6 μg kg−1). Polychaetes are an important vector for Hg biomagnification to the coastal avian food web. This research demonstrates that feeding depth and method of feeding are more important than trophic position or sediment Hg concentrations for predicting Hg bioaccumulation.


► Polychaete worms are abundant, diverse and ubiquitous in intertidal mudflats.
► Polychaetes are an important vector for Hg biomagnification to the avian food web.
► Labile Hg in the top of the sediment is correlated with Hg in surface-feeding worms.
► Deeper burrowing worms contain the greatest Hg and MeHg concentrations.
► Feeding ecology is as important as trophic level for predicting Hg bioaccumulation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 176, May 2013, Pages 18–25
نویسندگان
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