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AbstractIsopods Asellus hilgendorfi were collected from a small lake in northern Japan and examined to determine whether their body size and reproduction were affected by infection with larval acanthocephalans (Acanthocephalus sp.). Seasonal changes in the breeding ratio of isopods and the prevalence of larval acanthocephalan infection showed a reverse trend. Acanthocephalan larvae occurred mainly...
AbstractThe echinorhynchid acanthocephalan Acanthocephalus sp. was collected and described from four species of fishes (rainbow trout Oncorhynchus mykiss, Sakhalin huchen Hucho perryi, Japanese pond smelt Hypomesus nipponensis, and threespine stickleback Gasterosteus aculeatus) from a lake system, the Tsugaru-Jniko Lakes, in Aomori Prefecture, northern Japan. In rainbow trout, the prevalence and intensity...
Abstract The hydrograph of a small drainage basin was separated into the components of direct runoff, soil water runoff, and ground water runoff, by a method using a stable isotope (18O and deuterium) to analyze its hydrological characteristics. It shows that the direct runoff consists of rainwater during the event, soil water runoff originating from the latest rainwater before the event, and groundwater...
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