| 1 | Inducing Flow Velocities to Manage Fish Reproduction in Regulated Rivers显示文摘Conservation of endangered or economic fish and control of invasive fish is a great challenge of hydraulic engineering worldwide.Flow velocity has been recognized to affect the spawning of fishes delivering drifting eggs in rivers.However,solid scientific supports and associated mechanisms to establish quantitative relations between flow velocity and fish reproduction,taking into account spawning,fertilizing,hatching,as well as surviving,are lacking.In this paper,we quantified the relationship between flow velocity and reproduction of Chinese carps through both lab and field experiments.The results showed that a minimum velocity was required to trigger Hypophthalmichthys molitrix(H.molitrix)releasing eggs,and a velocity range was preferred to sustain spawning activity.However,the embryo incubation and larvae development of H.molitrix were found to be inhibited with the increase in flow velocity.Considering the requirements of spawning and hatching,as well as larvae surviving,an optimized flow velocity processes was identified for the reproduction of H.molitrix in rivers.These findings were of great significance to the adaptive operation of reservoirs to create reasonable and precise ecological flows for managing fish reproduction,as shown by the promising results in the engineering application to the Three Gorges Reservoir. | Qiuwen Chen Jianyun Zhang Yuchen Chen Kangle Mo Jun Wang Lei Tang Yuqing Lin Lei Chen Yong Gao Wei Jiang Yuxin Zhang | 2021 | Engineering2021，7，2： | 4 |
| 2 | Antibiotics along an alpine river and in the receiving lake with a catchment dominated by grazing husbandry显示文摘The livestock breeding industries face overuse of antibiotics,which has been intensively studied in recent years.However,the occurrence and fate of antibiotics as well as their potential threats to the aquatic environments in alpine and arid regions remain unclear.This study investigated the relationship of the occurrence and concentrations of antibi-otics between the Kaidu River and Bosten Lake in a typical alpine basin in China.Hot spots with antibiotic pollution source were explored.The antibiotic concentrations in river water and suspended sediment(SPS)were 2.20-99.4 ng/L and 1.03-176 ng/g.The dominant antibi-otics were tetracyclines,sulphacetamide,and ofloxacin in river water and sulfonamides,clarithromycin,roxithromycin,and ofloxacin in SPS.The apparent differences in pollution sources and landscapes in different reaches led to the obvious spatial patterns of antibiotics in the Kaidu River.Higher partition coefficient of antibiotic between SPS and water phases for sulfonamides than tetracyclines was because that tetracyclines strongly responded to clay contents while sulfonamides significantly responded to organic carbon contents in SPS.There were significant differences in detected antibiotic categories between the river and the lake.Fluoroquinolones(especially ciprofloxacin and enrofloxacin)were detected in the lake while sulphacetamide was only detected in the river.Therefore,the surrounding husbandry and aquaculture around the Bosten Lake was an important antibiotic pollution source in addition to inputs from the Kaidu River.This research suggested that alpine lakes could be an important sink of antibiotics in alpine dry regions,and thus impose greater threats to the aquatic ecosystem. | Jianwei Dong Dandan Yan Kangle Mo Qiuwen Chen Jianyun Zhang Yuchen Chen Zhiyuan Wang | 2022 | Journal of Environmental Sciences2022，34，5： | 0 |
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