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As water becomes increasingly scarce, water managers are seeking new and sustainable solutions to water supply problems. Any inappropriate human activity in a river basin can bring about a series of irreversible changes that may completely influence the character of water resources and the way of their downstream usage. The presented methodical principle represents an attempt to solve problems of...
The aim of this study was to identify empirical relationships among 12 water chemistry parameters, microcystins, and coliform bacteria at four beaches in Lake Winnipeg, Canada. While microcystin fluctuations were not synchronized among the different sites, concentrations were marginally correlated with concurrent nitrate levels at individual sites, but lagged more significantly behind soluble inorganic...
Transformation into shallow lakes can be a major post-harvesting land-use option for cutaway peatlands. We focused on lakes created on areas of a cutaway bog in the Seda Mire, Latvia, and the aim of our study was to analyse factors influencing water quality and communities in the cutaway lakes. It has been found that the residual peat amount and the lake feeding conditions (the balance between ground...
The tenor in organic matter has been assessed in an urban aquatic ecosystem the Mfoundi River Basin of Cameroon.The double technique of the Biochemical Oxygen Demand (BOD5) and the Oxydability test have been employed in this assessment. The results obtained indicate a high content of organic matter in the watershed with the highest values of BOD 297.5 mg O2 dm-3 and Oxydability 50.255 mg O2 dm-3 observed...
The aim of this study was to analyze and compare the relationship between environmental factors (temperature; pH; total phosphorus - TP and nitrogen - TN and their ratio) and occurrence of microcystin producing cyanobacteria in two shallow, eutrophic Polish water bodies, Sulejów Reservoir (Central Poland) and Bnińskie Lake (Western Poland). Samples for analyses were collected from June till October...
Two approaches are proposed for developing adapted metrics, proposing realistic and sustainable ecologic objectives, and suggesting a management strategy for stream rehabilitation. The first approach implemented a harmonization system of French standardized biotic indices. The second one was based on the development of functional traits (FTrs), which were defined by oligochaete assemblages inhabiting...
Ecohydrology has the potential to make a significant contribution to the global need for improved water resources management. An investigation was conducted into educational and capacity building activities related to ecohydrology in an effort to better integrate understanding, promote awareness of existing activities, and to recommend action for global knowledge translation. Based on a survey of...
Invasion of Impatiens glandulifera was reconstructed along rivers in the Czech Republic, central Europe, based on floristic records. The occurrence was assessed along river banks, outside the river banks, and along tributaries downstream from the first records of the species in 1902, 1903, 1978 and 1995, respectively. The following main results were obtained: (a) The species nowadays occupies 77%...
A total of 272 specimens of R. amarus caught in Siahroud River at the southern Caspian Sea from March 2006 to February 2007 were examined for life history attributes. Length-at-age was different between sexes. The von Bertalnffy growth function fit to backcalculated size at age data were: Lt= 94.16 [1-e-0.31(t+0.321)] and Lt=92.33[1-e-0.32(t+0.488)] for males and females respectively. WLR was estimated...
This review paper presents the results of many years’ research and field observations on ecological status of the catchment of Lake Tana in relation to the socioeconomic issues. There are a number of wetlands in Lake Tana region such as shore areas, head springs, permanent and temporary floodplains (riverine and manmade) which serve as crop production, fisheries, sand mining, wetland products harvesting,...
The rapid population growth of Addis Ababa poses the city with many environmental challenges. The current fragmented approach to sanitation and poor waste management has brought serious environmental and health problems. The study deployed purposive and stratified cluster sampling techniques in diagnosing the institutional arrangements for waste management through personal interviews and focus group...
Several cases of the developing water crisis in semi-arid regions of Tanzania are described. Some cases have transboundary causes. These include Lake Victoria and the riparian population as a result of hydroelectricity developments in Uganda, the Serengeti ecosystem threatened by deforestation of the Mau forest and irrigation in Kenya, and several national parks threatened by irrigation projects within...
We sampled fishes of the rivers Gendwuha, Guang, Shinfa, and Ayima with 6, 8, 10, 12 and 14 cm stretched mesh gillnet, monofilament of different mesh sizes, hook and line, fykenet and castnet. During October 2007 through January 2008 in both dry and wet seasons. 27 fish species were identified from the four rivers represented by the families: Centropomidae, Cichlidae, Bagridae, Schilbeidae, Clariidae,...
The water resources of the Lake Tana catchment are largely untapped. Currently, water resource development is being promoted to stimulate economic growth. This study utilized the WEAP model to determine the likely impact of a number of possible development scenarios on lake water levels. For each scenario, the model was used to simulate water demand in three sectors (i.e. irrigation, hydropower and...
Fishery and aquaculture play an enormous role in reducing poverty and alleviating food insecurity at household level. The first fish stocking program in Ethiopia was reported as early as 1925. Indigenous Oreochromis niloticus, Tilapia zilli, Clarias gariepinus and non-native Cyprinus carpio, Carassius carassius, Carassius auratus, Ctenopharyngodon idella and Salmo trutta fish species were used for...
The distribution of Lake Tana fish species was studied from January 2000 to December 2003. Samples were collected monthly using gill-nets of 60, 80, 100, 120 and 140 mm stretched mesh size. Labeobarbus spp., Oreochromis niloticus, Claris gariepinus and Varicorhinus beso are commercially important fish species and form 77%, 13%, 9% and 1% of the pooled experimental fish catch. There was significant...
The significance of solid waste management in ecohydrology research is obvious given the potential threat that solid waste poses on the intrinsic services of water purification, particularly in areas of high temperatures and precipitation levels. Improper waste disposal systems have adverse repercussions on environmental sanitation and impede water quality management efforts. The potential risk to...
Semi-intensive aquaculture practice started in 2005 in the Amhara region of Ethiopia. An evaluation survey was undertaken in September 2009. Beneficiaries, key informants and various groups were interviewed. Constructed aquaculture ponds were different in source of water, structure, age, original purpose, level of integration and the type of fish stocked. Farming households integrated aquaculture...
Land degradation caused by soil erosion (sheet and rill erosion) and soil fertility decline is a serious threat in the Ethiopian highlands, especially in the Gumara watershed. In this study the SWAT (Soil and Water Assessment Tool) model was applied to the Gumara watershed to predict sediment yield and runoff, to establish the spatial distribution of sediment yield and to test the potential of watershed...
The input of rain water to the forest floor and the composition of rainfall and throughfall water were monitored between October 2001 and September 2002 in a natural and two plantation (Eucalyptus globulus and Cupressus lusitanica) forests at Munesa, southeastern highlands of Ethiopia. The proportions of throughfall to annual incident rainfall that passed through the different forest canopies were...
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