Movement Responses of Sludge Worm Tubifex tubifex (Annelida, Oligochaeta) in Three Different Copper Concentrations

서지정보

ㆍ발행기관 : 한국하천호수학회 ㆍ수록지정보 : 생태와 환경 / 55권 / 3호
ㆍ저자명 : Hyejin Kang, Mi-Jung Bae, Young-Seuk Park

목차

Abstract
INTRODUCTION
MATERIALS AND METHODS
1. Test organisms
2. Observation of movement behaviors
3. Measurement of parameters in the movementbehaviors
4. Statistical analysis
RESULTS AND DISCUSSION
REFERENCES

영어 초록

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.

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