クロゴキブリの産卵と孵化についての 2, 3 の考察
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概要
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Observations were made on the oothecae of Periplaneta picea Shiraki, with respect to the period of incubation and the rate of natality. Ninety-four oothecae, deposited during the period from late May to the end of June, 1955, were marked respectively, and kept in the incubation (30-32℃, 70% R.H.) for 120 days. Adult females deposited ootheca at 3-10 days interval. The ootheca is the well-known 'purse' (11.7mm×5.4mm) with a ridge or seam on the upper edge. A single ootheca weighed 113mg in average. Its frequency distribution is bimodal as shown in Fig. 1. Number of eggs per ootheca is shown in Table 2, which shows that about 30% contain 24 eggs. Only 36 out of total 94 oothecae (33-47% at the 90% confidence) hatched, the period of incubation varying from 25 to 42 days (Table 3). Number of nymphs hatched from each of these 36 purses fell between 13 and 25. It showed no correlation with egg number (Fig. 2), initial weight of egg case, and period of incubation. Average number was 20 nymphs, which corresponds to 79-84% of the total eggs per ootheca. Frequency distributions of initial weight of the hatched and unhatched oothecae are shown in Fig. 3. Extremely thin and light egg case at the left end of the latter histograms were easily recognized by their appearance. These frequency diagrams, however, widely overlap each other and it is impossible by weighing to distinguish the one from the other. Oothecae begin to loss water as soon as they are deposited as shown in Fig. 4. Hatching seems to occur at the water content of 70-80% of initial weight. Unhatched oothecae became completely dry and weighed only 49 mg after 90-120 days.
- 日本昆虫学会の論文
- 1956-10-01
著者
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