title: Some population characteristics of planktonic crustaceans in neusiedler see.
abstract: Between May 1970 and May 1972 the total standing crop of planktonic crustaceans was highest in summer (288-693 ind. x103·m-3), whilst winter values varied from 8 to 58 ind. x103·m-3. The dominant species are Arctodiaptomus spinosus Daday and Diaphanosoma brachyurum Liéven. For Arctodiaptomus 4-5 generations per year were found, resting stages were never present. Diaphanosoma starts its development from the resting eggs at the end of March or at the beginning of April; the first male individuals occur at the end of August or at the beginning of September. Production of resting eggs begins in the middle of September. The biomass of individuals at various stages was determined as dry weight. By multiplying these values with the numerical counts one arrives at a value for biomass in the lake. The daily production has been calculated from the turnover time; the annual mean for Arctodiaptomus was 10.3 mg dry weight·m-3·day-1(1970) and 26.8 mg dry weight·m-3·day-1(1971), and that for Diaphanosoma was 1.6 mg dry weight·m-3·day-1(1970), and 21.7 mg dry weight·m-3·day-1(1971).
authors.affiliation: Limnologisches Institut der Österreichischen Akademie der Wissenschaften, Wien.
authors.forename: Alois
authors.initials: A
authors.lastname: Herzig