Seasonal dynamics of Bythonomus lemani and Bothrioneurum vejdovskyanum (Oligochaeta, Annelida) in relation to environmental variables

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Authors

SCHENKOVÁ Jana HELEŠIC Jan JARKOVSKÝ Jiří

Year of publication 2006
Type Article in Periodical
Magazine / Source Biologia
MU Faculty or unit

Faculty of Science

Citation
Field Ecology
Keywords Bythonomus lemani; Bothrioneurum vejdovskaynum; aquatic Oligochaeta; seasonal dynamics; time series
Description The seasonal dynamics of Bythonomus lemani (Lumbriculidae) were studied for the first time and the knowledge of Bothrioneurum vejdovskyanum (Tubificidae) was extended in the Rokytná River (Czech Republic) during April 1999 – April 2001. The influence of water temperature, velocity, depth, discharge, pH, conductivity, dissolved oxygen amount and biochemical oxygen demand (BOD) on their life cycles was evaluated. Habitat preferences of the juvenile and adult stages were recorded. Time series analysis was used to determine the worm densities, seasonality and trends. For Byth. lemani one distinct reproduction cycle per year was found and this was regulated by temperature, while Both. vejdovskyanum showed a one-year cycle not significantly dependent on measured environmental variables. Byth. lemani showed a significant negative correlation between the trend of its density and BOD concentration.
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