The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Jinduo Xu - One of the best experts on this subject based on the ideXlab platform.
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fourteen year record 2000 2013 of the spatial and temporal dynamics of floating algae blooms in Lake chaohu observed from time series of modis images
Remote Sensing, 2015Co-Authors: Yuchao Zhang, Min Zhang, Hongtao Duan, Steven Arthur Loiselle, Jinduo XuAbstract:As the fifth largest freshwater Lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and Lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle Lake areas show that water quality conditions are deteriorating. This has occurred at the same time as Lake Management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for Lake Management.
Jeffrey A. Thornton - One of the best experts on this subject based on the ideXlab platform.
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Stakeholder participation in Lake Management in Wisconsin (USA)
Lakes and Reservoirs: Research and Management, 2013Co-Authors: Jeffrey A. ThorntonAbstract:The State of Wisconsin (USA) has 15 000 natural Lakes. Many of these Lakes are managed by the Wisconsin Department of Natural Resources pursuant to their mandate as the State's natural resources conservation agency. This level of Management is primarily focused on issuance of hunting and fishing licences, boating licences and administration of relevant State regulations. Supporting this governmental function is a network of stakeholders who are organized under the auspices of various statewide programmes, such as the Citizen Lake Monitoring Network, or formed into local community-based organizations. These organizations include special purpose units of government, principally public inland Lake protection and rehabilitation districts, as well as private associations, some of which might be incorporated under Wisconsin law and/or granted federal non-profit status. This article describes the various organizational options open to Lake stakeholders and outlines the types of activities in which they engage. Lessons learned through this active programme of stakeholder participation are used to illustrate the value of this range of organizations.
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The World Lake Vision and ecohydrology: case study from Wisconsin, USA
Ecohydrology and Hydrobiology, 2013Co-Authors: Jeffrey A. Thornton, Walter Rast, Thomas M. Slawski, Sara W. Teske, Michael R. CascioAbstract:Abstract The World Lake Vision represents a firm global foundation for Lake Management across national and cultural boundaries. It provides a set of sustainable use and protection goals for our global water resources. Based on seven principles, the World Lake Vision emphasizes the need for a balance between people, and requires the participation of citizens and policy makers in Lake Management planning efforts. The recently-completed Lake and stream restoration project at Upper Kelly Lake, City of New Berlin, Waukesha County, and Village of Hales Corners, Milwaukee County, Wisconsin (USA) forms a case study illustrating the successful application of these seven principles. Upper Kelly Lake is a small drainage Lake in an urbanized location, with a stream inlet that has been historically channelized. Through the efforts of the Kelly Lakes Association, Inc., in addition to local and state governments, Lake protection and Lake Management grants were acquired to fund the stream and wetland restoration project described in this case study.
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The Role of Socio-Economic Determinants in Lake Management in Developing Countries
Lake and Reservoir Management, 1991Co-Authors: Jeffrey A. Thornton, Walter Rast, Sven-olof RydingAbstract:ABSTRACT The compilation of international handbooks on the Management of eutrophication and nonpoint source pollution posed a number of conceptual problems, not the least of which was the determination of relevant and meaningful methods to span the spectrum of developed and developing world applications. Given that most of the Lake Management strategies currently being employed throughout the world are based in whole or in part on methods developed in Europe or North America, this problem is a significant one. Not only are there measurable limnological differences between waterbodies in the temperate zone versus waterbodies in the tropics/subtropics, but also differences in the levels of technical skills and “hardware” exist between these regions. Many developing countries suffer badly from loss of skills to the developed world and must buy goods and services in the field of Lake Management. Hence, to be successful, both the investigations and implementations must take cognizance of the climatic and techn...
Erik Jeppesen - One of the best experts on this subject based on the ideXlab platform.
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Recent Sedimentation Rates of Shallow Lakes in the Middle and Lower Reaches of the Yangtze River: Patterns, Controlling Factors and Implications for Lake Management
Water, 2017Co-Authors: Xuhui Dong, Thomas A. Davidson, Xiangdong Yang, Xu Chen, Qinghui Zhang, Qian Liu, Rong Wang, Min Yao, Erik JeppesenAbstract:Significantly increased sedimentation rates (SRs) in Lakes worldwide in recent decades due to higher inputs of silt and eutrophication have led to significant environmental problems such as Lake size diminishment and degraded water quality. Many Lakes in the middle and lower reaches of the Yangtze River basin (MLYB) have followed this pattern. For effective Lake Management, it is essential to understand the pattern and drivers of SRs in these Lakes. Fourteen typical Lakes in the MLYB were chosen to examine the spatiotemporal patterns of SRs and identify the drivers over different time periods. Since 1900, SRs increased from
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Lake restoration and Management in a climate change perspective an introduction
Water, 2017Co-Authors: Erik Jeppesen, Martin Sondergaard, Zhengwen LiuAbstract:Lakes all around the globe are under severe pressure due to an increasing anthropogenic impact from a growing population in a more developed world. Accordingly, today, many Lakes are highly eutrophic and suffer from severe blooms of often toxic cyanobacteria and may become even more eutrophic in the future unless strong Lake Management actions are taken. Recent research has further shown that global warming and subsequent changes in water use will further exacerbate the eutrophication process in Lakes. There is therefore a growing demand for Lake restoration and insight into sustainable Lake Management. The measures to be taken, however, depend on the climate and other local conditions. This special issue addresses Lake restoration and Management with special emphasis on the restoration of eutrophicated Lakes within a climate change perspective. The papers included collectively highlight that the ongoing climate change affects Lake water quality by (1) changes in external and internal nutrient loading; (2) higher frequency of extreme events (such as hurricanes); (3) temperature‐induced changes in biota, biotic interactions; and (4) water level. Lower nutrient loading is therefore needed in a future warmer world to achieve the same ecological state as today. Several papers discuss Lake restoration methods within a climate change perspective and show practical results, notably of various attempts of biomanipulation. Finally, some papers discuss the effects of other anthropogenic stressors and their interaction with climate.
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Effects of benthic-feeding common carp and filter-feeding silver carp on benthic-pelagic coupling: Implications for shallow Lake Management
Ecological Engineering, 2016Co-Authors: Xiufeng Zhang, Erik Jeppesen, Zhengwen Liu, William D. Taylor, Lars G. RudstamAbstract:Abstract Benthic–pelagic coupling is a key factor in the dynamics of shallow Lakes. A 12-week mesocosm experiment was set up to test the hypotheses that benthic-feeding common carp (Cyprinus carpio) reduce the growth of benthic algae and promote eutrophication and that filter-feeding silver carp (Hypophthalmichthys molitrix) stimulate benthic algae growth and promote the establishment of a clear-water state. Compared to the controls, the common carp treatment had higher concentrations of total nitrogen (TN) and total phosphorus (TP) in the water column, higher biomass of pelagic algae (measured as chlorophyll a), higher total suspended solids (TSS) concentrations, lower light intensity, and lower biomass of benthic algae at the sediment surface. Silver carp did not change the chlorophyll a of pelagic algae relative to the controls, but they did decrease the biomass of benthic algae and increase TP and TSS. A microcosm experiment using 32P radiotracer was conducted to examine effects of the two carp species on the release of sediment phosphorus (P). The P release to the water column was higher with common carp present than without common carp. This was not the case in the silver carp experiments. Our findings show that both common carp and silver carp deteriorate water quality by increasing TP and TSS concentrations and decreasing the biomass of benthic algae at the sediment surface. Common carp had a larger negative effect on water quality than silver carp, perhaps because only common carp enhanced P release from the sediment. The implications for Lake Management are that removal of both common carp and silver carp from shallow Lakes may enhance the growth of benthic algae and help promote the establishment of a clear-water state.
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Effects of hypolimnetic oxygenation on water quality: results from five Danish Lakes
Hydrobiologia, 2009Co-Authors: Lone Liboriussen, Inge Thorsgaard, Simon Grünfeld, Tue S. Jakobsen, Martin Sondergaard, Erik Jeppesen, Kim HansenAbstract:Stratified eutrophic Lakes often suffer from hypolimnetic oxygen depletion during summer. This may lead to low redox conditions and accumulation of phosphate and ammonia in the hypolimnion. Hypolimnetic oxygenation has been used as a Lake Management strategy to improve the water quality in five eutrophic dimictic Danish Lakes where oxygenation was conducted for 4–20 years. In one Lake, the hypolimnetic oxygen concentration clearly improved by oxygenation, whereas the other four Lakes still exhibited low mean summer levels (
Yuchao Zhang - One of the best experts on this subject based on the ideXlab platform.
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fourteen year record 2000 2013 of the spatial and temporal dynamics of floating algae blooms in Lake chaohu observed from time series of modis images
Remote Sensing, 2015Co-Authors: Yuchao Zhang, Min Zhang, Hongtao Duan, Steven Arthur Loiselle, Jinduo XuAbstract:As the fifth largest freshwater Lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and Lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle Lake areas show that water quality conditions are deteriorating. This has occurred at the same time as Lake Management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for Lake Management.
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Fourteen-Year Record (2000–2013) of the Spatial and Temporal Dynamics of Floating Algae Blooms in Lake Chaohu, Observed from Time Series of MODIS Images
Remote Sensing, 2015Co-Authors: Yuchao Zhang, Min Zhang, Hongtao Duan, Steven Arthur LoiselleAbstract:As the fifth largest freshwater Lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and Lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle Lake areas show that water quality conditions are deteriorating. This has occurred at the same time as Lake Management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for Lake Management.
Steven Arthur Loiselle - One of the best experts on this subject based on the ideXlab platform.
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fourteen year record 2000 2013 of the spatial and temporal dynamics of floating algae blooms in Lake chaohu observed from time series of modis images
Remote Sensing, 2015Co-Authors: Yuchao Zhang, Min Zhang, Hongtao Duan, Steven Arthur Loiselle, Jinduo XuAbstract:As the fifth largest freshwater Lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and Lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle Lake areas show that water quality conditions are deteriorating. This has occurred at the same time as Lake Management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for Lake Management.
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Fourteen-Year Record (2000–2013) of the Spatial and Temporal Dynamics of Floating Algae Blooms in Lake Chaohu, Observed from Time Series of MODIS Images
Remote Sensing, 2015Co-Authors: Yuchao Zhang, Min Zhang, Hongtao Duan, Steven Arthur LoiselleAbstract:As the fifth largest freshwater Lake in China, Lake Chaohu has drawn increasing attention due to the decline in water quality and the occurrence of massive algal blooms. We applied an algae pixel-growing algorithm to MODIS Terra or Aqua data (2100 images) to characterize surface floating algae bloom dynamics from 2000 to 2013 with respect to meteorological and Lake nutrient conditions. The results show an increase in surface algal bloom coverage, frequency, and duration with a trend toward earlier bloom formation. Importantly, spatial and temporal patterns in the historically less compromised eastern and middle Lake areas show that water quality conditions are deteriorating. This has occurred at the same time as Lake Management has made a catchment scale effort to reduce impact. Our results show that nutrient concentrations were not the main driver of inter-annual bloom variations. Local meteorological conditions, in particular wind speed and temperature, played an important role in the dynamics of floating algal bloom. This highlights the important challenges for Lake Management.
