کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5751246 1619709 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Precipitation and temperature drive seasonal variation in bioaccumulation of polycyclic aromatic hydrocarbons in the planktonic food webs of a subtropical shallow eutrophic lake in China
ترجمه فارسی عنوان
بارش و دما در اثر تغییرات فصلی در ذخیره سازی زباله های هیدروکربن های آروماتیک چند حلقه ای در شبکه های غذای پلانکتونی دریاچه یوتروپیک نیم تنیک در چین
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- 14-month monitoring was conducted in the subtropical shallow eutrophic Lake Xuanwu.
- Long-term plankton biomass of this lake was significantly correlated with temperature.
- Precipitation affected seasonal occurrence of PAHs in the water column of this lake.
- Biomass dilution dominated bioaccumulation of PAHs by phytoplankton and zooplankton.
- Biomagnification of PAHs from phytoplankton to zooplankton was positively correlated with temperature.

Hydrophobic organic contaminants (HOCs) are toxic and ubiquitous in aquatic environments and pose great risks to aquatic organisms. Bioaccumulation by plankton is the first step for HOCs to enter aquatic food webs. Trophic status is considered to dominate variations in bioaccumulation of HOCs in plankton in temperate and frigid deep oligotrophic waters. However, long-term driving factors for bioaccumulation of HOCs in planktonic food webs of subtropical shallow eutrophic waters have not been well investigated. China has the largest subtropical lake density in the Northern Hemisphere. Due to limited field data, long-term variations in the bioaccumulation of HOCs in these lakes are almost unknown. Here we take Lake Xuanwu as an example to investigate long-term variations in the bioaccumulation, and biomagnification of polycyclic aromatic hydrocarbon (PAHs) in planktonic food webs of subtropical shallow eutrophic lakes in China, and elucidate the driving factors. Our results indicate that temperature rather than nutrients dominates long-term dynamics of planktonic biomass in this lake. Precipitation significantly enhances the concentrations of the PAHs, and total suspended particles, and consequently affects the distribution of the PAHs in the water column. Biomass dilution induced by temperature dominates bioaccumulation of the PAHs by both phytoplankton and zooplankton (copepods and cladocerans). Biomagnification of the PAHs from phytoplankton to zooplankton is positively correlated with temperature. Our study suggests that temperature and precipitation drive long-term variations in the bioaccumulation of the PAHs in the planktonic food webs of this subtropical shallow eutrophic lake. Lake Xuanwu has a similar mean annual temperature, annual precipitation, sunshine duration, and nutrient levels as other subtropical shallow eutrophic lakes in China. This study may also help to understand the bioaccumulation of HOCs in planktonic food webs of other subtropical shallow eutrophic lakes.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 583, 1 April 2017, Pages 447-457
نویسندگان
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