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자료유형
학술저널
저자정보
Jeon, Mun-Jang (Department of Forest Resources, College of Life and Environmental Science, Daegu University) Choi, Won-Il (Division of Forest Disease and Insect Pests, Korea Forest Research Institute) Choi, Kwang-Sik (Division of Forest Disease and Insect Pests, Korea Forest Research Institute) Chung, Yeong-Jin (Division of Forest Disease and Insect Pests, Korea Forest Research Institute) Shin, Sang-Chul (Division of Forest Disease and Insect Pests, Korea Forest Research Institute)
저널정보
한국응용곤충학회 Journal of Asia-Pacific Entomology Journal of asia-pacific entomology 제9권 제3호
발행연도
2006.1
수록면
269 - 274 (6page)

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To understand influence of two species of parasitoids on host population dynamics, adult population dynamics of pine needle gall midge (PNGM), Thecodiplosis japonensis and two species of parasitoids, Inostemma matsutama and Inostemma seoulis were observed using emergence traps from 1986 to 2005. Density of PNGM decreased after outbreaks in 1986 and 1987 and showed density-dependent regulation. Relationships between density of PNGM and its parasitoids were linear except the period of outbreak regardless of parasitoids species. Relationships between host density and parasitism of I. matsutama and I. seoulis were density-independent and inverse density-dependent, respectively. I. seoulis was the dominant parasitoid against PNGM. Interspecific competition between two parasitoids was not strong and temporal niche segregation between two parasitoids was a possible mechanism for coexistence of two parasitoids. The parasitoid complex responded to changes in host density more sensitively than single parasitoid species. These results suggested that two parasitoid can stabilize PNGM population density without strong negative effects on each species of parasitoids.

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