Abstract
A survey of the distribution ofSigara selecta (Fieber) in the south-west Netherlands is reported. Some chemical, physical and biological parameters are presented. The species was found in about 20, for the greater part mesohaline and polyhaline, inland waters, usually accompanied bySigara stagnalis (Leach). In these waters an increase in the density of the vegetation is accompanied by a replacement ofS. stagnalis byS. selecta.
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