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Biologia

, 61:517 | Cite as

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

  • Jana Schenková
  • Jan Helešic
  • Jiří Jarkovský
Article

Abstract

The seasonal dynamics of Bythonomus lemani (Lumbriculidae) were studied for the first time and the knowledge of Bothrioneurum vejdovskyanum (Tubificidae) was extended based on four quantitative samples of oligochaetes taken monthly in the Rokytná River (Czech Republic) during a two-year study (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. The overall trend was an increase in density for Byth. lemani and a decrease in density for Both. vejdovskyanum. Byth. lemani showed a significant negative correlation between the trend of its density and BOD concentration.

Key words

Bythonomus lemani Bothrioneurum vejdovskaynum aquatic Oligochaeta seasonal dynamics time series analysis 

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Copyright information

© Institute of Zoology, Slovak Academy of Sciences 2006

Authors and Affiliations

  • Jana Schenková
    • 1
  • Jan Helešic
    • 1
  • Jiří Jarkovský
    • 2
  1. 1.Faculty of Science, Institute of Botany and ZoologyMasaryk UniversityBrnoCzech Republic
  2. 2.Centre of Biostatistics and Analyses, Faculty of Medicine and Faculty of ScienceMasaryk UniversityBrnoCzech Republic

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