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Comparison of density estimates of Nematoda and Harpacticoida obtained by a Van veen grab and SCUBA diving from a sandy sediment in shallow water shows that Harpacticoida are sampled efficiently with the grab but nematoda are not. For the Nematoda, total density is underestimated. and the...
An experimental permanent quadrat study was carried out in a mosaic vegetation of algae in the undergrowth of theSalicornietum strictae in the saltmarsh of Holwerd (The Netherlands, prov. Friesland).
The developments in the algal vegetation units were described by means of mapping....
InUtricularia minor vegetation a number ofLecane spp. are found. Remarks are made regarding confusion resulting from the use of VOIGT's keys.
The salt tolerance, the salt preference and the blood sodium regulation at 15°C ofGammarus roeseli from running fresh water were studied.
It tolerates diluted sea water of 1‰ Cl' better than habitat water.
It prefers the habitat water when able to choose suparnormal...
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