Change in Spatial Dispersion of Daphnia magna (Cladocera: Daphniidae) Populations Exposed to Organophosphorus Insecticide, Diazinon

, Sang-Hee Lee; , Chang Woo Ji; , Tae-Soo Chon

Published online January 1, 1986

Journal of Environmental Toxicology 2009;24(3):231-240.

유기인계 살충제(다이아지논)에 대한 물벼룩, Daphnia magna(Cladocera: Daphniidae) 개체군의 공간분산 변이

이상희, 지창우, 전태수

Change in Spatial Dispersion of Daphnia magna (Cladocera: Daphniidae) Populations Exposed to Organophosphorus Insecticide, Diazinon

Sang-Hee Lee , Chang Woo Ji , Tae-Soo Chon

ABSTRACT

We explored collective behaviors of indicator species to elucidate the effect of the chemical stress. After the treatments of an insecticide, diazinon, at low concentrations (1.0 and 10.0 ㎍/L), spatial dispersion patterns of Daphnia magna were checked in a test chamber. The I-index was used to characterize the movement data before (0~1 h) and after (1~2 h) the treatments in laboratory conditions. The slopes of the frequency distribution of I-index in semi-log scale decreased significantly, and the test populations appeared to be more dispersed with a lower degree of aggregation after the treatments. The index was feasible in indicating decrease in the ability of the specimens to keep desirable distances with neighbor individuals under chemical stress and showed a possibility of monitoring presence of toxic chemicals in environment through group behavior measurement.

Keywords: Daphnia magna; spatial dispersion; I-index; biomonitoring; response behavior; multi-individual distance