Subtitle:

Dynamika populacji Philodina citrina ; Population dynamics of Philodina citrina Ehr. (Rotatoria) bred in aquaria

Contributor:

Polska Akademia Nauk. Komitet Ekologiczny

Publisher:

Państwowe Wydawnictwo Naukowe

Place of publishing:

Warszawa

Description:

Pages 161-170 ; 24 cm ; Bibliographical references (page 169) ; Abstract in English

Type of object:

Journal/Article

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.

Relation:

Ekologia Polska. Seria B

Volume:

6

Issue:

2

Start page:

161

End page:

170

Detailed Resource Type:

Article

Resource Identifier:

oai:rcin.org.pl:120508 ; ISSN 0424-7205

Source:

MiIZ PAN, call no. P.3259 ; click here to follow the link

Language:

pol

Language of abstract:

eng

Rights:

Creative Commons Attribution BY 3.0 PL license

Terms of use:

Copyright-protected material. [CC BY 3.0 PL] May be used within the scope specified in Creative Commons Attribution BY 3.0 PL license, full text available at: ; -

Digitizing institution:

Museum and Institute of Zoology of the Polish Academy of Sciences

Original in:

Library of the Museum and Institute of Zoology of the Polish Academy of Sciences

Projects co-financed by:

Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.

Access:

Open