@misc{Hillbricht_Anna_Dynamika_1960,
 author={Hillbricht, Anna},
 editor={Polska Akademia Nauk. Komitet Ekologiczny},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 howpublished={online},
 year={1960},
 language={pol},
 abstract={As a result of observations, lasting one and a half years, on the quantitative dynamics of a spontaneously developing population of Philodina citrina in thirteen aquaria containing higher green vegetation and algae, the variable occurrence of this rotifer was established. In the majority of the aquaria (9) Ph. citrina is a scarce species (i. e. often occurs in single specimens) or sporadic species (i. e. occurs rarely and then only single specimens). Ph. citrina occurs in the four remaining aquaria also, usually in small numbers, with the exception of certain periods, varying in duration, of intensive development of the population of this species. During the periods of intensive development of Ph. citrina, the algae present in the aquarium form the basis on which the eggs are laid and individuals of varying size were grouped. The numerical level of occurrence, however, of this rotifer in aquaria, and also its quantitative dynamics, are not strictly bound up with the development dynamics of algae.Three classes of size were established (small -up to 150 μ, medium -150300 μ, large -over 300 μ). It was found that during the period of occurrence in small numbers (the most frequent periods in the materiał examined) -about 20 individuals per litr -and also certain periods of greater numbers, the population of Ph. citrina consists solely of large individuals. In periods when numbers are several times greater than this (up to 900 individuals per litr) differences in the size of individuals occur as the result of intensive reproduction. In phases of increase in population numbers, small and medium individuals predominate, and in the peak phase and in phases of decrease in numbers, large individuals predominate. The above cycles of population development took place most clearly in two of the series of 13 aquaria in which Ph. citrina occurred in the greatest numbers. In the remaining aquaria in which Ph citrina occurred chiefly in small numbers with small and short-lived increases in numbers -large individuals always predominated.},
 type={Text},
 title={Dynamika populacji Philodina citrina Ehr. (Rotatoria) w hodowli akwariowej},
 URL={http://rcin.org.pl/Content/120508/PDF/WA058_98143_P3259-6_Eko-Pol-B.pdf},
 volume={6},
 number={2},
 journal={Ekologia Polska. Seria B},
 publisher={Państwowe Wydawnictwo Naukowe},
 keywords={Rotifera, Rotatoria, Philodina citrina},
}