The aim of this study was to assess the interaction between Daphnia similis and various organisms related to the rice paddy ecosystem. We selected several organisms that are likely to prey on D. similis and evaluate predation rate as well as responses of D. similis to the chemical compounds exuded by these organisms. As a result of predation experiment, larval dragonfly (Anax parthenope) and Triops longicaudatus were clearly shown decreasing abundances of D. similis. Especially, Triops longicaudatus was observed higher feeding rates on D. similis than larval dragonfly. Chemical compounds from the vertebrates such as fish (Misgurnus anguillicaudatus, Pseudorasbora parva, Micropterus salmoides) and tadpole of frog (Rana nigromaculata) did not affect the life history of Daphnia. However, a potential predatory fish P. parva induced significantly longer tail spine in Daphnia. In addition, among the invertebrates (T. longicaudatus, A. Parthenope, Micronecta spp., Palaemon paucidens), chemical compounds exuded by T. longicaudatus induced shorter body and significantly longer tail spine in D. similis.

• 나긍환(순천대학교 환경교육과) | La, Geung- Hwan
• 한은진(순천대학교 환경교육과) | Eun-Jin Han
• 원두희((주)생태조사단 부 설 두희생태연구소) | Doo Hee Won
• 김정희(순천대학교 환경교육과) | Jeong-Hui Kim
• 정쥬리(순천대학교 환경교육과) | Jyoo-Ri Jeong
• 김현우(순천대학교 환경교육과) | Hyun-Woo Kim Corresponding author