کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4398839 1306707 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heavy metals in sediments and uptake by burrowing mayflies in western Lake Erie basin
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
پیش نمایش صفحه اول مقاله
Heavy metals in sediments and uptake by burrowing mayflies in western Lake Erie basin
چکیده انگلیسی

During the past two decades, burrowing Hexagenia mayflies have returned to the western basin of Lake Erie. Because of their importance as a prey resource for higher trophic levels and their extensive residence time in potentially contaminated sediment, Hexagenia may be a source of heavy metal transfer. To better understand the distribution and transfer of heavy metals in sediment and mayflies, sediment and mayfly nymphs were collected from 24 locations across the western basin of Lake Erie in May 2007. Following USEPA protocols, samples were analyzed for 16 elements using ICP-OES or ICP-MS. Metal concentrations in the sediments exceeded the Threshold Effect Level for at least one metal at all sample sites. Sediment heavy metal distribution profiles indicate metal concentrations are correlated with organic matter content, and the highest heavy metal concentrations were found in the central deeper region of the western basin where organic content in the sediments was greatest. Hexagenia were distributed throughout the western basin, with greatest density (1350/m2) within the Detroit River plume. The Cd and Zn levels in mayflies were on average approximately 4 and 2 times greater, respectively, than sediment levels, and the Cd concentrations in the sediments exceeded the Threshold Effect Level at 27 of 28 sites and exceeded the Probable Effect Level at 9 of 28 sites. Spatial representation of heavy metal concentrations in mayflies exhibited a similar pattern to the spatial distribution of heavy metals and organic matter in the sediments with higher concentrations of metals found in mayflies residing in the central deeper region of the western basin.

Research Highlights
► Heavy metals in sediments from Lake Erie exceeded threshold effect levels (TEL).
► Cd in sediments exceeded probable effect level (PEL) at 9 of 28 sites in Lake Erie.
► Heavy metal distribution is correlated with total organic content (TOC).
► Cd and Zn levels in mayflies are about 4 and 2 times greater than in the sediments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Great Lakes Research - Volume 37, Issue 1, March 2011, Pages 1–8
نویسندگان
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