Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Movement Responses of Sludge Worm Tubifex tubifex (Annelida, Oligochaeta) in Three Different Copper Concentrations

  • Received : 2022.09.08
  • Accepted : 2022.09.26
  • Published : 2022.09.30
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Abstract

Monitoring and assessing aquatic ecosystems using the behavior of organisms is essential for sustainable ecosystem management. Oligochaetes, which inhabit various freshwater ecosystems, are frequently used to evaluate the environmental conditions of freshwater ecosystems. Tubifex tubifex (Müller, 1774) (Oligochaeta, Tubificidae) is tolerant to organic pollution and has been used to evaluate the toxicity of toxicants, including heavy metals. We studied the behavioral responses of T. tubifex to three different copper concentrations (0.1, 0.5, and 1.0 mg L-1). The specimens were exposed to copper in an observation cage containing 150 mL of dechlorinated water. Movement behavior (diameter, speed, acceleration, meander, and turning rate) was continuously observed for two hours before and after the copper treatments. After the treatments, the diameter shrank and showed rapid twisting movement under all the copper conditions. The turning rate had a positive correlation with meander and acceleration both before and after treatment at all three concentrations, whereas speed and meander had a negative correlation. Length and turning rate also showed a negative correlation. The correlation coefficient between speed and acceleration in the highest copper concentration changed from positive before treatment (r=0.64) to negative (r= -0.52) after treatment. Our results present the possibility of using behavioral parameters to detect copper contamination in freshwater ecosystems.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) funded by the Korean government(NRF-2013R1A1A2009494 & NRF-2019R1A2 C1087099) and by Korea Environment Industry & Technology Institute (KEITI) through Aquatic Ecosystem Conservation Research Program funded by Korea Ministry of Environment(MOE)(2020003050003).

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