@misc{Hillbricht-Ilkowska_Anna_The_1970,
 author={Hillbricht-Ilkowska, Anna and Węgleńska, Teresa},
 editor={Polish Academy of Sciences, Institute of Ecology},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 howpublished={online},
 year={1970},
 language={eng},
 abstract={Together with a decreasing sampling frequency the variability of calculated values of production and biomass of three species (Eudiaptomus graciloides, Daphnia cucullata, Keratella cochlearis) increase in comparise to the value obtained on the basis of very frequently taken samples, i.e. everyday. Especially great deviations are noticed, when the sampling interval is longer than 6 days. Assessments of production and biomass on the basis of the mean parameters for the given sampling interval give less variable values as compared with the values calculated on the basis of initial parameters. An effect of the character of population dynamics on the relation "calculated production values - sampling frequency" was noticed. The production values of rotifers calculated according to the three different methods were compared.},
 title={The effect of sampling frequency and the method of assessment on the production values obtained for several zooplankton species},
 type={Text},
 URL={http://rcin.org.pl/Content/71177/PDF/WA058_86366_P2840-T18_Eko-Pol-A-Nr-27.pdf},
 volume={18},
 number={27},
 journal={Ekologia Polska},
 publisher={Państwowe Wydawnictwo Naukowe},
 keywords={freshwater zooplankton, lakes, research, Poland, Masurian Lakeland},
}