Oncomelaniaの食性に関する一新検査方法とO.hupensisの食性に関する二, 三の知見 : Oncomelaniaの食性に関する研究 I

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The authors devised a simple new technic for studying the habit of Oncomelania, as follows. Oncomelania is put on the bottom of a Petri dish of ca. 10cm diameter and soon it attaches on the surface with its foot and begins to creep. Then the dish is put upside down under the dissecting microscope. So with the aid of the microscope the form and movement of its buccal mass is clearly observed and as a result of this its feeding aspect can be precisely persued. Applying such a technic we observed the feeding habit of Oncomelania hupensis and the result is as follows. 1. Among the artificial foodstuffs Oncomelania hupensis took the rice powder most rapidly, then wheat powder and lotus seed powder. 2. The mud from the habitat of Oncomelania is taken very rapidly by the latter ; at the same time the former is discharged frequently by the latter. Such facts suggest that Oncomelania usually feeds itself with the mud in its natural habitat. On the other hand a large quantity of diatoms (Naviculaceae) are found in its old feces as well as in the mud of its habitat, whereas they are rarely found in its feces immediatly after excretion. Such facts, suggest that Oncomelania in its habit at utilize those diatoms as its nutriments. 3. When Oncomelania was fed with calcium arsenate mixed with mud in various percentage, it took the mixture more rapidly as the percentage of calcium arsenate diminished. This fact indicates some facilities in case of applying this drug as a molluscacide.
日本生態学会の論文
1957-05-31

Oncomelaniaの食性に関する一新検査方法とO.hupensisの食性に関する二, 三の知見 : Oncomelaniaの食性に関する研究 I

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