introduction urmia lake in the northwestern corner of iran is one of the largest permanent hyper saline lakes in the world and the largest lake in the middle east. it is extended as much as 140 km from north to south and is as wide as 85 km east to west during high water periods. qualitative and quantitative degradation of water resources is one of the major challenges in the way of sustainable...

Monthly changes in water quality parameters (physicochemical) of a rain fed lake (Bilikere) in Mysore city, were investigated for two calendar years (2002 and 2003) to assess the suitability of this lake for pisciculture. Although there were monthly fluctuations in water temperature, total suspended solids (TSS), dissolved oxygen (DO), nitrite and ammonia, they were within the desirable limits....

a r t i c l e i n f o Numerous biological and chemical paleorecords have been used to infer paleoclimate, lake level fluctuation and faunal composition from the drill cores obtained from Lake Malawi, Africa. However, fish fossils have never been used to examine changes in African Great Lake vertebrate aquatic communities nor as indicators of changing paleolimnological conditions. Here we presen...

We reconstructed Holocene water-level and vegetation dynamics based on pollen and plant macrofossils from a coastal lake in Upper Michigan. Our primary objective was to test the hypothesis that major fluctuations in Great Lakes water levels resulted in part from climatic changes. We also used our data to provide temporal constraints to the mid-Holocene dry period in Upper Michigan. From 9600 to...

This paper begins with an overview of the African rainfall regime, noting in particular the contrast among various regions Ž . of the continent, followed by a description of the nature of climatic i.e., rainfall variability over Africa on time scales of decades and centuries. The decadal scale is examined using modern data covering the twentieth century. The century scale is examined using hist...

The geology of the Calumet River region is briefly reviewed to provide a background fo r applied research in the area . The review relies heavily upon research conducted by scientists affiliated with the Indiana and Illinois Geological Surveys . At the end of the Late Wisconsinan glacial epoch , fluctuations in the Lake Michigan Lobe of the Laurentide Ice Sheet resulted in the formation of thre...

Water-level fluctuations are critical in maintaining diversity of plant communities Great Lakes wetlands. Sedge-grass meadows especially sensitive to such fluctuations. We conducted vegetation sampling a sedge-grass dominated Lake Michigan drowned river mouth wetland 1995, 2002, and 2010 following high lake levels 1986 1997. also photointerpretation studies 16 years dating back 1965 include res...

In this paper, the water level fluctuations of eight Ethiopian Rift Valley lakes were analyzed for their hydrological stability in terms of water level dynamics and their controlling factors. Long-term water balances and morphological nature of the lakes were used as bases for the analyses. Pettit’s homogeneity test and Mann–Kendall trend analysis were applied to test temporal variations of the...

Hulun Lake is located in the Buir Grassland Inner Mongolia and an important component of northern ecological barrier China. Fluctuations its area directly affect stability surrounding environments. In this study, was taken as study object, meteorological data, water body area, level, reservoir capacity, runoff volume, social statistical data were used to dynamic changes critical driving forces....

The distribution and composition of wetland habitats for wintering waterbirds are heavily influenced by water level fluctuations. Through polder construction aquaculture activities, paddy fields ponds have decreased the lateral connectivity fluctuations in lake. However, impacts on habitat suitability, which can be seen using high-resolution images analysis, often cannot separate disturbances c...