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The VanSickle equation is derived from the Von Foerster equation by a change of variable from age to weight with growth not depending on time explicitly.
The author's, previous treatment of Pechen's first graphical method for calculating production is corrected.
The diatoms of two Dutch lowland streams were studied. The stream Beerze is heavily polluted by the effluent of a sewage treatment plant, causing a change in the pH from less than 4 to more than 6. The acidobiontic diatomEunotia exigua is replaced by more alkaline and eutraphentic species such...
Two marine crabs, the osmoconforming velvet crab (Macropipus puber) and the hyperregulating shore crab (Carcinus maenas), have been exposed to different salinitytemperature combinations.
In Macropipus puber temperature does not influence the blood osmoconcentration within the...
An interstitial water sampler, capable of taking samples throughout entire tidal cycles, is described.
The sampler can operate at high water depths of up to three metres.
Salinity data from within the Ythan estuary, Scotland, are presented.
Im Flachlands ist es möglich, wenn die passenden Milieufaktoren zusammen treffen, auch Organismen anzutreffen, welche bisher als typisch für alpine gegenden betrachtet wurden.
So wurden verschiedene dieser alpinen und für die Niederlande neuen Formen in der Einleitung beschriebenen...
The division of the associations of rhizopods fromSphagnum swamps into three types by HARNISCH (1929) has been in general confirmed by later investigations (HOOGENRAAD, 1935).
The absence or presence of many species ofNebela indicates differences between the environmental conditions...
Chemostat and batch grownOscillatoria agardhii Gomont were exposed to darkness for a prolonged period of time. The specific decay rate in the dark was measured in order to find if it matched the specific maintenance rate constant. It did not; indeed the specific decay rate was found to be...
A cheap, light and simple device is described for the sampling of physico-chemical microgradients in the free-water zone of shallow water bodies. The sampler is commercialized by ATS, Mariastraat 42, The Hague, The Netherlands.
The macrophyte production and the transport of particulate organic matter between march and adjacent estuary have been investigated for a 30 ha salt marsh along the Oosterschelde estuary, The Netherlands.
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