کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6308592 1618860 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mercury and selenium in tropical marine plankton and their trophic successors
ترجمه فارسی عنوان
جیوه و سلنیوم در پلانکتون دریایی گرمسیری و جانشینان طوفان آنها
کلمات کلیدی
ذخیره سازی بیولوژیک، پستاندار ساحلی ماهی، رابطه جیوه و سلنیوم، متیل کرچک، پلانکتون،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Feeding habit influenced on the accumulation of Hg, MeHg and Se by marine species.
- Pelagic food chain has higher MeHg biomagnification potential than benthic food chain.
- Different MeHg detoxification strategies were found in the liver of organisms.
- An antagonistic effect of selenium on MeHg was observed in dolphin liver.
- The MeHg to Hg ratios did not change with increasing Se:Hg in liver of fish.

Selenium (Se), mercury (Hg) and methylmercury (MeHg) were determined in microplankton (⩾25 μm), crustacean muscle tissue, in the muscle and liver of two fish species and tissues of a dolphin from a bay in the Brazilian Southeast coast. Differences were found between the fish and dolphin muscle and hepatic concentrations. Liver showed the highest concentrations of Se and Hg. Positive biotransference of MeHg from source to consumer was observed for all interactions, demonstrating that MeHg biomagnified along the food web. The pelagic food chain has the highest biomagnification potential when compared to the benthic system. A large excess of Se in relation to Hg was observed in all tissues. The muscle and liver of the predator species, the dolphin and the carnivorous fish, presented similar MeHg. The predator species presented similar MeHg to Hg (% MeHg) ratios in muscle tissues (∼100%), whereas dolphin showed lower hepatic% MeHg (18) than the carnivorous fish (69%). Iliophagous fish presented the lowest % MeHg in tissues. Fish showed a positive relationship between hepatic MeHg and Se, whereas % MeHg did not change with increasing Se:Hg molar ratios in liver. Dolphins showed a significant inverse relationship between hepatic MeHg and Se and the % MeHg and Se:Hg ratios. This suggests a strong antagonistic effect of Se on MeHg assimilation and accumulation in this species. Probably, the differences observed among Hg as MeHg and Se and on the effect of Se on MeHg assimilation and accumulation in all marine species are related to the physiological differences between dolphins and fish.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 111, September 2014, Pages 32-39
نویسندگان
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