کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4529835 1625982 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exposure histories derived from selenium in otoliths of three cold-water fish species captured downstream from coal mining activity
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Exposure histories derived from selenium in otoliths of three cold-water fish species captured downstream from coal mining activity
چکیده انگلیسی

Establishing exposure to contaminants within a given environment is often difficult for fish species with large home ranges. Chemical analyses of muscle or visceral tissue are useful indicators of recent exposure, but depuration, metabolic transformation, and tissue redistributions can alter temporal resolution. Otoliths are metabolically stable and thus provide complete chemical records within their calcified tissues that, when coupled to the annular structure, can provide temporal resolution for exposure to trace metals. Otoliths from bull trout, cutthroat trout, and mountain whitefish from an area rich in seleniferous soils and with active coal mining activity were analyzed for selenium to determine any history of exposure to elevated levels of selenium. Selenium concentrations in otolith primordia tended to be low, indicating that these fish emerged in low selenium areas. Later life stages showed peaks of high Se concentrations, suggesting that individuals moved into areas of increased selenium later in life. Individuals captured from the same area had a wide variety of selenium exposure profiles, indicating that these fish do not move en masse into and out of high-selenium areas. Year-to-year variability of selenium exposure patterns within an otolith suggests inconsistent utilization of high- and low-selenium areas by the individual. The inconsistent exposure profiles for these fish, in addition to their home range of tens of kilometres, indicate that soft tissue concentrations, while useful indicators of recent exposure, cannot be relied upon to provide a life history recording of exposure.


► Selenium concentrations in otoliths near coal mining operations were analyzed.
► Concentrations downstream from mining were high compared to reference sites.
► Low Se in otolith cores indicate fish only born in low Se areas.
► Se pattern variations show inconsistent utilization of habitats.
► Otoliths may be used to track movements of fish among areas of varying Se levels.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Toxicology - Volume 105, Issues 3–4, October 2011, Pages 492–496
نویسندگان
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