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In the period 1977–1981 a study was carried out in a lowland stream to investigate the effect of P-removal in a sewage treatment plant on the biomass production by aquatic macrophytes. Biomass development, the role of the sediment, the ‘natural’ phosphate concentrations of streams, the...
Highest uptake of32P by young shoots of three plant species was observed and lowest by old ones. The uptake of32P was highest inHydrilla shoots, followed byVallisneria andPotamogeton.
Ecologists are nowadays frequently involved as experts in environmental decisionmaking. On the basis of eleven case-studies of the Dutch situation this article discusses the main problems they meet.
The feeding strategies and feeding techniques of 12 nematode species, isolated from the Ems-Dollard estuary, were investigated in agar cultures. In the consumption of bacteria, algae, diatoms, protozoa and small metazoa, two main strategies are distinghuished: the non-selective strategy,...
To compare the reproduction rhythmicity ofP.amnicum, P.subtruncatum, P.personatum andP.casertanum from two localities in South Poland, diagrams of length frequency were made. Most data were collected forP.personatum and the index of domination of the young (P) was calculated.
During a hydrobiological investigation in the polder area ‘Midden-Delfland’ (Province of Zuid-Holland), ecological parameters of the habitat ofHydrobius niger (Zschach, 1788) andHydrobius fuscipes (Linnaeus, 1758) were gathered at localities of similar morphogenesis. Out of 50 localities,H.niger...
Substantial numbers of predominantly O+ fish were impinged on the cooling water screens of Harculo, Gelderland, Merwedehaven and Amer power stations. Low numbers were impinged at the two stations located on the river Meuse (Maas and Claus). Two possible reasons for this difference are...
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