Can water level management, stock enhancement, and fishery restriction offset negative effects of hydrological changes on the four major Chinese carps in China’s largest freshwater lake?

2019 ◽  
Vol 403 ◽  
pp. 1-10 ◽  
Author(s):  
Yuyu Wang ◽  
Yu-Chun Kao ◽  
Yangming Zhou ◽  
Huan Zhang ◽  
Xiubo Yu ◽  
...  
Keyword(s):  
Water Level ◽  
Stock Enhancement ◽  
Freshwater Lake ◽  
Negative Effects ◽  
Hydrological Changes ◽  
Water Level Management ◽  
Chinese Carps

Ecosystem development in Lake Volkerak-Zoom: concept and strategy

1995 ◽  
Vol 31 (8) ◽  
pp. 239-243 ◽  
Author(s):  
W. Ligtvoet ◽  
S. A. de Jong
Keyword(s):  
Water Level ◽  
Fish Stock ◽  
Ecosystem Development ◽  
Optimal Conditions ◽  
Stock Management ◽  
Key Factors ◽  
Integrated Water Management ◽  
Ecological Concepts ◽  
Freshwater System ◽  
Water Level Management

In the 6000 ha Lake Volkerak-Zoom, a new freshwater system in the estuarine southwest of The Netherlands, biomanipulation is used as a tool in ecosystem development. The basic ecological concepts for ecosystem development are described. Key factors in the integrated water management are fish stock management and water level management, geared towards creating optimal conditions for northern pike, the dominant predator in mesotrophic waters. The main aspects of the water level management and the fish stock management are outlined.

Effects of Submergence and Nitrogen Concentration on the Resources Utilization of Alternanthera philoxeroides

2013 ◽  
Vol 864-867 ◽  
pp. 239-242
Author(s):  
Wen Juan Ding ◽  
Hua Yong Zhang ◽  
Fang Juan Zhang
Keyword(s):  
Water Level ◽  
Biomass Allocation ◽  
Invasive Plant ◽  
Nitrogen Concentration ◽  
Soluble Sugar ◽  
Nitrogen Pollution ◽  
Water Bodies ◽  
Alternanthera Philoxeroides ◽  
Negative Effects ◽  
Nitrogen Concentrations

This study examined the effects of submergence and nitrogen concentration on biomass allocation and nutrients utilization of an invasive plant Alternanthera philoxeroides. In the experiment, A. philoxeroides was applied to two water level treatments (0 and 25cm above the surface) across with two nitrogen concentrations (0 and 10 mg/l N). The results showed that submergence decreased leaf fraction and increased stem fraction, but high N changed this situation. In submergence, high N increased leaf fraction but decreased stem fraction due to leaves survival and maintenance. Submergence decreased root fraction and the content of soluble sugar in stem. The results suggested that high N concentration could counteract the negative effects of submergence. Therefore, the risk of A. philoxeroides invasion might be enhanced by nitrogen pollution in fluctuating water bodies, and should be attention intensely.

Groundwater-surface water relations in regulated lowland catchments; hydrological and hydrochemical effects of a major change in surface water level management

2019 ◽  
Vol 660 ◽  
pp. 1317-1326 ◽  
Author(s):  
Joachim Rozemeijer ◽  
Janneke Klein ◽  
Dimmie Hendriks ◽  
Wiebe Borren ◽  
Maarten Ouboter ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Level ◽  
Water Relations ◽  
Major Change ◽  
Water Level Management

scholarly journals Modelling the Impacts of Bathymetric Changes on Water Level in China’s Largest Freshwater Lake

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1469 ◽  
Author(s):  
Lingyan Qi ◽  
Jiacong Huang ◽  
Junfeng Gao ◽  
Zhen Cui
Keyword(s):  
Water Level ◽  
Water Resource Management ◽  
Freshwater Lake ◽  
Lake Ecosystem ◽  
Spatial Gradient ◽  
Dramatic Decline ◽  
Hydrodynamic Processes ◽  
Lake Poyang ◽  
The Stability ◽  
Bathymetric Changes

A recent dramatic decline in water level during the dry season in China’s largest freshwater lake (Lake Poyang) significantly influenced water availability and biogeochemical processes. To learn the potential causes of water level decline, this study investigated the hydrodynamic response to bathymetric changes during three typical hydrological years by scenario simulation using Environmental Fluid Dynamics Code (EFDC). The simulation results indicated that bathymetric changes resulted in a water level decrease during a low water level period. Inter-annual variation in the decrease rate implied that water level in typical dry and wet years were influenced more significantly than that in moderate hydrological years. A spatial gradient in the distribution of water level changes was also observed, which was mainly concentrated in the main channel. Water velocities also slowed down, weakly corresponding to the decrease in water level during the low water level period. Overall, bathymetric changes caused by sand mining contributed to water level and velocity variations, influencing the stability and sustainability of the lake ecosystem. This study can potentially enhance our understanding of the hydrodynamic processes in Lake Poyang and support water resource management.

Effect of 2,4-D and Various Salts on Eurasian Watermilfoil

Weed Science ◽  
1974 ◽  
Vol 22 (6) ◽  
pp. 591-594 ◽  
Author(s):  
Ronald A. Stanley
Keyword(s):  
Acetic Acid ◽  
Water Level ◽  
Aquatic Weed ◽  
Eurasian Watermilfoil ◽  
Laboratory Conditions ◽  
Mutual Antagonism ◽  
Tennessee Valley ◽  
Water Level Management ◽  
Dichlorophenoxy Acetic Acid

The management of Eurasian watermilfoil, an inimical aquatic weed in the Tennessee Valley, involves the use of water level management and herbicidal treatment with 2,4-D [(2,4-dichlorophenoxy)acetic acid]. The possible use of other chemicals to make 2,4-D more effective was tested by measuring growth of Eurasian watermilfoil under laboratory conditions with combinations of sublethal levels of 2,4-D and partially inhibitory concentrations of AlCl3, NH4Cl, Na2AsO2, BaCl2, Na2B4O7, CuSO4, HgCl2, Pb(NO3)2, NaCl, and ZnSO4. At the levels tested, BaCl2, Pb(NO3)2, and ZnSO4were only additive in effect with 2,4-D. Other compounds produced synergism at some concentrations and mutual antagonism at other levels. The greatest synergism was obtained by using HgCl2, AlCl3, and NaCl at 0.2 μM, 10.0 μM, and 200.00 mM respectively.

scholarly journals Effects of water-level management on nesting success of common loons

2013 ◽  
Vol 77 (8) ◽  
pp. 1626-1638 ◽  
Author(s):  
Steve K. Windels ◽  
Erik A. Beever ◽  
James D. Paruk ◽  
Aleya R. Brinkman ◽  
Jennifer E. Fox ◽  
...  
Keyword(s):  
Water Level ◽  
Nesting Success ◽  
Common Loons ◽  
Water Level Management
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