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.
Related projects:	Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL) Diversity of Biotic Communities and Populations: Causal Analysis of variation in space and time