健全な食料生産をめざして : I. 水田における水生甲殻類の消長
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概要
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Temporal changes of the germination of aquatic crustaceans such as Triopsidae, Chirocephalidae, Limnadiidae, Daphniidae, and Cypridae in paddy field were investigated. Soil samples were collected from the plowed layer of around the inlet for irrigation water of paddy fields at Imabari and its boundary region, Ehime, during duration of the year '91 to 97. About 15mL volumes of each soil samples collected was added in a 100mL beaker, submerged with around 100mL tap water, and incubated at 22℃ for a week under condition of 14h light - 10h dark photoperiod. All the tests of germination were performed in duplicate. Larvae, metanauplius or nauplius, of crustaceans being germinated during a week were observed and recognized with the naked eyes the germination of aquatic crustaceans. Aquatic crustaceans of such as Triopsidae, Chirocephalidae, Daphniidae, and Cypridae showed almost positive correlation between the germination in the lavatory (in vitro) and that in the corresponded paddy field (in vivo), while.Limnadiidae, didn't. Hence, in this paper temporal change of the germination of the former four families was surveyed among years or paddy fields by using above germination test in vitro. The results showed as follows: 1) All of the germination ratios of Triopsidae, Chirocephalidae, Daphniidae, and Cypridae were significantly different at p<0.001 among every years and paddy fields. 2) On the germination of every aquatic crustaceans, those ratios of Triopsidae and Chirocephalidae were significantly different among paddy fields at p<0.001 and p<0.01 respectively, and its ratio of Cypridae among years at p<0.001. On the other hand, the germination ratio of Daphniidae was no difference among paddy fields and years. 3) Time course of the germination of each aquatic crustacean every paddy field groups was examined, and in consequence both ratios of Chirocephalidae and Cypridae were significantly different of 3 and 4 paddy field groups respectively, especially the latter exhibited highly difference, but Triopsidae and Daphniidae no difference.
- 2005-03-29