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Different influences, like changes in salinity and temperature, the effects of heavy metals like copper and mercury, and the influences of nitrate and silicate deficiencies on the shape, generation time, and yield of the marine plankton diatomBiddulphia sinensis were tested in batch cultures....
Natural phytoplankton from Lake Constance was exposed to competition experiments in continuous culture at 6 different molar rations of P∶Si as potentially limiting nutrients. As predicted by theory there was competitive exclusion of all species but one at single nutrient limitation, and...
A number of developments in the Dutch inland fisheries during the last century are described. They indicate a structural change in the fishery as well as in the ecosystem. For the fishery management by sport fishermen a new set of criteria has to be developed along the existing one based on the...
About one third of the Dutch environmental research is concentrated on aquatic problems. The largest number of these projects is physicochemical (65%) and 47% of the aquatic projects contains an ecological component. The aquatic research projects are executed in a large number of different...
The gap between laboratory and nature is much smaller for ecotoxicity tests with microorganisms than for those with higher organisms, since more or less balanced, mixed populations as a whole are used and the test results are normally interpreted in close relation with realistic exposure...
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