Yu Jinlei
Chinese Academy of Sciences
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Featured researches published by Yu Jinlei.
Journal of Lake Sciences | 2012
He Hu; Yu Jinlei; Zhang Ming; Liu Zhengwen; Li Kuanyi
Nitrogen discharged into lake ecosystems typically has different nitrogen stable isotope ratios(δ15N) and measurement of δ15N in organisms can be useful indicators of anthropogenic impacts from the watershed.The δ15N values of Bellamya aeruginosa were investigated in four bays of Lake Taihu.Results showed that δ15N values in snail ranged from 6.9‰ to 18.1‰,with an average of 11.2‰.Snail δ15N values displayed a significant variation among four bays.The highest average value was found in Meiliang Bay(17.7‰),followed by Gonghu Bay(13.2‰),East Taihu(10.2‰) and Zhushan Bay(7.8‰).Our investigation suggested that both Meiliang Bay and Gonghu Bay have received tremendous amount of domestic sewage derived from increasing human activities.Therefore,its necessary to promote investment of sewage treatment plants in surrounding cities including Wuxi and Changzhou.Our research also indicated that Zhushan Bay,which is located in northwest part of Lake Taihu is mainly affected by agriculture non-point source pollution.So its necessary to reduce the use of fertilizers to improve the water quality of that bay.Nitrogen discharged into lake ecosystems typically has different nitrogen stable isotope ratios(δ15N) and measurement of δ15N in organisms can be useful indicators of anthropogenic impacts from the watershed.The δ15N values of Bellamya aeruginosa were investigated in four bays of Lake Taihu.Results showed that δ15N values in snail ranged from 6.9‰ to 18.1‰,with an average of 11.2‰.Snail δ15N values displayed a significant variation among four bays.The highest average value was found in Meiliang Bay(17.7‰),followed by Gonghu Bay(13.2‰),East Taihu(10.2‰) and Zhushan Bay(7.8‰).Our investigation suggested that both Meiliang Bay and Gonghu Bay have received tremendous amount of domestic sewage derived from increasing human activities.Therefore,its necessary to promote investment of sewage treatment plants in surrounding cities including Wuxi and Changzhou.Our research also indicated that Zhushan Bay,which is located in northwest part of Lake Taihu is mainly affected by agriculture non-point source pollution.So its necessary to reduce the use of fertilizers to improve the water quality of that bay.
Journal of Lake Sciences | 2012
Yu Jinlei; He Hu; Li Kuanyi; Chen Feizhou; Liu Zhengwen
Coilia ectenes taihuensis Yen et Lin(C.ectenes) is the dominant fish species in Lake Taihu,and the catch has been increasing with the eutrophication of Lake Taihu.In this study,in order to investigate the seasonal diets variations of C.ectenes in Gonghu Bay of Lake Taihu,we sampled the fish by gill net and analyzed bimonthly the gut contents of C.ectenes from April to December,2009.Meanwhile,selectivity for different food items was also analyzed for the purpose to study the food preference of the fish.The results showed that the food composition of C.ectenes varied from month to month.Zooplankton,fish larvae,shrimp and insects were found in the stomach contents of the fish,but zooplankton was the dominant food.Among the zooplankton species,Copepod was the main food in April with close mean percentages diet composition of Copepodite,Sinocalanus dorrii Brehm and Cyclops spp.In June,August and October,C.ectenes fed mainly on cladoceran with Moina spp.as the dominated mean percentage diet composition in June and Bosmina spp.in August and October,respectively.Small zooplankton composed the main percentage diet composition,such as Bosmina spp.and Moina spp.,in all sampling months.However,C.ectenes negatively selected Bosmina spp.for their food,but positively selected Moina spp.and other large-sized zooplankton species.But when Daphnia spp.and Leptodora kindti Focke were present in the sampling months,C.ectenes showed high selectivity for them.From this investigation,we can conclude that C.ectenes feed mainly on planktonic crustaceans,and showed high selectivity for large-sized zooplankton.Moreover,fish larvae,shrimp and insects may be their potential food for the fish when its total length is longer than 130mm.Different food items varied largely in fish food composition among different seasons.Studying on the diet composition of C.ectenes can help us understand the seasonal effects of C.ectenes on zooplankton community structures better,and provide evidences and foundations for making rational plans of fisheries and lake management.Coilia ectenes taihuensis Yen et Lin(C.ectenes) is the dominant fish species in Lake Taihu,and the catch has been increasing with the eutrophication of Lake Taihu.In this study,in order to investigate the seasonal diets variations of C.ectenes in Gonghu Bay of Lake Taihu,we sampled the fish by gill net and analyzed bimonthly the gut contents of C.ectenes from April to December,2009.Meanwhile,selectivity for different food items was also analyzed for the purpose to study the food preference of the fish.The results showed that the food composition of C.ectenes varied from month to month.Zooplankton,fish larvae,shrimp and insects were found in the stomach contents of the fish,but zooplankton was the dominant food.Among the zooplankton species,Copepod was the main food in April with close mean percentages diet composition of Copepodite,Sinocalanus dorrii Brehm and Cyclops spp.In June,August and October,C.ectenes fed mainly on cladoceran with Moina spp.as the dominated mean percentage diet composition in June and Bosmina spp.in August and October,respectively.Small zooplankton composed the main percentage diet composition,such as Bosmina spp.and Moina spp.,in all sampling months.However,C.ectenes negatively selected Bosmina spp.for their food,but positively selected Moina spp.and other large-sized zooplankton species.But when Daphnia spp.and Leptodora kindti Focke were present in the sampling months,C.ectenes showed high selectivity for them.From this investigation,we can conclude that C.ectenes feed mainly on planktonic crustaceans,and showed high selectivity for large-sized zooplankton.Moreover,fish larvae,shrimp and insects may be their potential food for the fish when its total length is longer than 130mm.Different food items varied largely in fish food composition among different seasons.Studying on the diet composition of C.ectenes can help us understand the seasonal effects of C.ectenes on zooplankton community structures better,and provide evidences and foundations for making rational plans of fisheries and lake management.
Journal of Lake Sciences | 2017
Sun Huan; Zhang Yongdong; Yu Jinlei; Hu Jinrun; Liu Zhengwen; Su Yaling
Allochthonous dissolved organic carbon (DOC) is of importance in lake carbon stock, therefore, the contribution and pathways of allochthonous DOC to planktonic crustaceans deserves further study. A controlled experiment was performed through adding glucose labeled with δ13C in water from Lake Fuxian. By analyzing the samples of phytoplankton and zooplankton species, quantity and phospholipid fatty acid (PLFA) biomarkers and their carbon stable isotope, the contribution of allochthonous DOC to crustacean zooplankton carbon source was investigated. The results showed that after adding glucose, δ13C values of bacteria and planktonic crustaceans(Bosmina) increased rapidly from -16.28‰ to 5408.25‰ and -23.88‰ to 1974.7‰, respectively, where⁃ as the δ13C value of chlorophyceae increased from -27.07‰ to 342.44‰. The growth rate showed that bacteria and zooplankton firstly utilized the adding glucose. The δ13C values of bacteria, particulate organic matter (POM) and zooplankton increased sharp⁃ ly at the first day, moreover, the δ13C value of bacteria is much higher than that of zooplankton and POM. After the first day, δ13C values of bacteria and POM decreased, by contrast, zooplankton δ13C value increased slowly. This suggests that allochthonous DOC is firstly utilized by bacteria and form cell particles via the metabolism of bacteria. Subsequently, planktonic crustaceans can utilize allochthonous DOC by grazing cell particles.
Journal of Great Lakes Research | 2015
Zhang Yongdong; Su Yaling; Liu Zhengwen; Chen Xiangchao; Yu Jinlei; Di Xiaodan; Jin Miao
Limnologica | 2015
Zhang Yongdong; Su Yaling; Liu Zhengwen; Chen Xiangchao; Yu Jinlei; Di Xiaodan; Jin Miao
Archive | 2015
Chen Feizhou; Guan Baohua; Yu Jinlei; Di Xiaodan
Archive | 2015
Guan Baohua; Liu Zhengwen; Zhang Yongdong; Chen Feizhou; Yu Jinlei; Di Xiaodan
Archive | 2017
Yu Jinlei; Liu Zhengwen; Guan Baohua; Chen Feizhou
Archive | 2017
Yu Jinlei; Liu Zhengwen; Guan Baohua; Chen Feizhou
Archive | 2015
Chen Feizhou; Di Xiaodan; Li Ke; Guan Baohua; Yu Jinlei