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A modified, artificial substrate method was used to study the effects of laundry wastewater on benthic algae in a polder in the western part of the Netherlands. In a polluted ditch a clear chemical gradient was found with regard to the parameters conductivity, B.O.D., C.O.D., NH4, ortho-P,...
Potamogeton showed the highest rates of dark respiration, net photosynthesis, photorespiration, and Hill activity, and the highest chlorophyll a:b ratio, and the lowest photosynthesis:photorespiration ratio.Hydrilla showed the lowest dark respiration, photorespiration and chlorophyll a:b...
A predictive model for stratification has been evaluated using the data from a deep sand pit with no natural inflow or outflow of water. The general approach in the development of the predictive model has been given in detail.
Lake Timsah, which lies almost half-way the Suez Canal, is highly populated with fouling assemblages consisting of algae, sponges, coelenterates, tube worms, bryozoans, barnacles, amphipods, molluscs and ascidians.
Tube worms (Hydroides elegans), barnacles (Balanus eburneus andB....
The area investigated embraces Suez harbour, El Shalloufa, Geneva, Kebret (at the Bitter Lakes), Devresoir and Tossoum pilotage stations. It extends about 75 km along the Suez Canal.
The Suez-Geneva section is poorly fouled, mainly due to the high silt content of the water. At Suez...
Data about morphology, life history and habits ofGonionemus vertens A. Agassiz (Hydrozoa, Limnomedusae) are given. The distribution of the species is treated in more detail, especially its mechanism in relation to large-scale (global) and small-scale (local) range extensions.
Literature on the horizontal distribution patterns from the littoral zone into the open water of fresh-water zooplankton is reviewed. The results of experiments on the avoidance of macrophytes and of the shore are presented.
In the lightAcanthodiaptomus avoidedMyriophyllum...
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