The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Authors present the hypothesis that freshwater fish diversity, recruitment and production depend greatly on riparian ecotones. These boundary environments are usually the most diverse elements of aquatic systems. Riparian ecotones moderate the transfer of energy and materials from the land, provide a high load of organic matter including invertebrate food, and moderate competition and predation among...
Lake Kortowskie is restored by the hypolimnetic withdrawal method: rich in nutrients near-bottom waters are removed by a pipeline directly to the outflow instead of the natural outflow of surface waters. It has been found out that the amount of water discharged through the pipeline and therefore the amount of removed phosphorus depends on the surface inflow. The water balance of the lake in summer...
Higher nutrients concentrations were observed into the surface microlayer then in the subsurface of estuarine, shallow lake water. The thinner the surface microlayer, which means the closer it is to the water-atmosphere contact zone, the higher are concentrations of organic and inorganic phosphorus, as well as organic and ammonia nitrogen. Mean values of enrichment coefficients were usually positive...
In a mosaic landscape moderately affected by agriculture and tourism, such as found in the Masurian Lakeland (north-eastern Poland) external input of nutrients (TP, TN, NNO3) and their retention were compared in a cascade of shallow in-river lakes, between several years of different weather conditions. The average and maximum air temperature in the summer and winter months and that of the freshet...
The adverse changes to Ireland’s rivers and lakes, that result from deterioration in water quality, channelization and alteration of natural hydrological features, have impacted on the habitats of a variety of important fish stocks. These anthropogenic effects, and the recent changes in landscape management, which also threaten the other aspects of aquatic biodiversity of many Irish river catchments...
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 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...
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...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.