北海道のヤブカOchlerotatus亜属2種
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概要
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In the present paper I reported the following two species of Aedes. 1. Aedes (Ochlerotatus) hexodontus Dyar (Fig. 1) hitherto unknown from Japan. Locality : Zenibako (Hokkaido). 2. Aedes (Ochlerotatus) intrudens Dyar (Fig. 2), pupa and larva of which hitherto unknown from Japan. Adults were recorded by Hattori (1958) from Maruyama and Teine (Hokkaido). Locality of examined specimens : Zenibako (Hokkaido). In the middle of April, 1956 I collected larvae of these two species from transient ground pools (ca. 1-10m^2) which occurred due to melting snow in the woods of oak-tree, Quercus, which stood ca. 200m apart from the coast of Zenibako facing Ishikari Bay. First instar larvae appeared in the pools mentioned above in the middle of March, 1958. Every year they emerged in the middle of May and their adults were captured in the woods till the end of June. Probably they emerge once a year. Females of both species attack human being for blood-sucking in daytime. The inhabitation of A. hexodontus was restricted to shaded pools (max. water temp. 19℃) in the woody area. Larvae of A. intrudens inhabited together with A. hexodontus in shaded pools and with A. excrucians in sunny shallow pool at the margin of the woods ; in the latter, water temperature reached more than 30℃ in daytime. Water of larval habitats had colour from light to dark brown and its chemical characters were as follows : chlor, consumption of KMnO_4, ammonia nitrogen and pH were 15-23mg/l, 50-110mg/l, 0.08-0.24mg/l and 6.8-7.2 respectively. It was likely that one of the principal factors governing the inhabitation of A. hexodontus is amount of sunshine.
- 社団法人日本動物学会の論文
- 1959-08-15