کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5744648 | 1412363 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Seasonal dynamics of photosynthetic activity, Microcystis genotypes and microcystin production in Lake Taihu, China
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم زمین و سیاره ای (عمومی)
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چکیده انگلیسی
In recent years, toxic Microcystis blooms have occurred annually in Lake Taihu, China. In order to elucidate the relationships between photosynthetic activity of Microcystis, Microcystis genotypic composition, microcystin (MC) production and environmental factors, water samples and associated environmental data were collected from January to December 2014 in Lake Taihu. Seasonal variations in photosynthetic activity were measured using a Phyto-PAM Analyzer, abundances of total and toxic Microcystis genotypes were determined by quantitative real-time PCR (qPCR), and MC concentrations were quantified by HPLC. The maximum quantum yield of photosystem II (Fv/Fm) of Microcystis cells changed on a seasonal basis. Fv/Fm was not detectable in the winter, but increased from spring to early summer, after which, it gradually decreased until the winter. The level of non-photochemical quenching (NPQ) increased from March to August and then decreased until December. qPCR data showed that the abundances of total Microcystis genotypes ranged from 1.91Â ÃÂ 105 to 8.64Â ÃÂ 107Â copies/mL and toxic Microcystis genotypes ranged from 2.38Â ÃÂ 104 to 5.67Â ÃÂ 107Â copies/mL. The toxic proportion varied from 12.5 to 65.6%, with an average value of 27.9%. Correlation analysis revealed that there was a positive correlation between photosynthetic activity, genotypic composition and MC production. Water temperature was the only environmental factor that was positively correlated with Fv/Fm, NPQ, total and toxic Microcystis and intracellular MC. Additionally, total phosphorus was also significantly correlated with intracellular MC. These results indicate that future global warming, in addition to eutrophication, could promote Microcystis blooms in Lake Taihu and that blooms may increase in intensity and toxicity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Great Lakes Research - Volume 43, Issue 4, August 2017, Pages 710-716
Journal: Journal of Great Lakes Research - Volume 43, Issue 4, August 2017, Pages 710-716
نویسندگان
Da-ming Li, Hong-yan Zheng, Jian-lin Pan, Tong-qing Zhang, Sheng-kai Tang, Jian-ming Lu, Li-qiang Zhong, Yan-shan Liu, Xiao-wei Liu,