کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4550750 1627581 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Trophic influences on mercury accumulation in top pelagic predators from offshore New England waters of the northwest Atlantic Ocean
ترجمه فارسی عنوان
تأثیرات طوفان بر روی تجمع جیوه در شکارچیان پلاژیایی بالا از آبهای دریای نیو انگلند در شمال غربی اقیانوس اطلس
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
چکیده انگلیسی


• Diet influences mercury accumulation in southern New England top predator fishes.
• Muscle mercury content exceeded 0.3 ppm wet weight in 70% of individuals examined.
• Mercury increased exponentially with δ 15N values, a proxy for trophic position.
• Mercury content was positively related to prey size and dependence on teleost prey.
• Dolphinfish size-specific accumulation rates were high relative to sharks and tunas.

Trophic pathways and size-based bioaccumulation rates of total mercury were evaluated among recreationally caught albacore tuna (Thunnus alalunga), yellowfin tuna (Thunnus albacares), shortfin mako shark (Isurus oxyrinchus), thresher shark (Alopias vulpinus), and dolphinfish (Coryphaena hippurus) from offshore southern New England waters of the northwest Atlantic Ocean between 2008 and 2011. Mercury concentrations were highest in mako (2.65 ± 1.16 ppm) and thresher sharks (0.87 ± 0.71 ppm), and significantly lower in teleosts (albacore, 0.45 ± 0.14 ppm; yellowfin, 0.32 ± 0.09 ppm; dolphinfish, 0.20 ± 0.17 ppm). The relationship between body size and mercury concentration was positive and linear for tunas, and positive and exponential for sharks and dolphinfish. Mercury increased exponentially with δ 15N values, a proxy for trophic position, across all species. Results demonstrate mercury levels are positively related to size, diet and trophic position in sharks, tunas, and dolphinfish, and the majority of fishes exhibited concentrations greater than the US EPA recommended limit.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Environmental Research - Volume 101, October 2014, Pages 124–134
نویسندگان
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