ギシギシを摂食する3種ハムシ類の資源利用様式
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概要
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SUZUKI, Nobuhiko (Dept. Biol., Fac. Sci., Kyushu Univ., Fukuoka). 1985. Resource utilization of three chrysomelid beetles feeding on Rumex plants with diverse vegetational background. Jap. J. Ecol., 35 : 225-234. Resource utilization and patch use of three chrysomelid beetles, Gastrophysa atrocyanea, Galerucella vittaticollis and Mantura clavareaui, feeding on Rumex plants, were investigated in a habitat with a diverse vegetational background. Mantura, having the shortest food demand among the three species, preoccupied the food resource by the earliest appearance after overwintering, and utilized all food patches regardless of size. The feeding specialist, Gastrophysa, having the largest food demand among the three species, occurred in relatively large patches. Gastrophysa adults appeared even in the patches with a relatively low level of resource abundance in the early stage of the reproductive period, but thereafter gradually became concentrated in the large patches (resource concentration). On the other hand, the feeding generalist, Galerucella, showed no concentration in large patches. In many cases, the resource was preoccupied by Gastrophysa and Mantura because of the latest appearance of Galerucella. However, Galerucella adults lived long and deposited eggs in many patches, resulting in the condition of "spreading of risk" for food shortage. Movement among patches was frequently found, with Galerucella utilizing the patches one after another (opportunistic resource utilization). It was concluded that the difference in resource utilization patterns resulting from different ecological properties and requirements among the three species enabled them to coexist in the same habitat.
- 日本生態学会の論文
- 1985-06-30