Studies on the mechanisms of ionic regulation in mosquito larvae : II. The changes and regulation of the concentrations of Na and Cl in the haemolymph of larvae kept in various sea waters

MATSUMOTO Akira, MATUTANI Kozi, KITADA Jinichi, OKADA Minoru

doi:10.7601/mez.27.405

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Other Title

蚊類幼虫の塩分調節機構に関する研究 : 第 2 報海水による体液濃度の変動と調節
蚊類幼虫の塩分調節機構に関する研究-2-海水による体液濃度の変動と調節
カルイヨウチュウノエンブンチョウセツキコウニカンスルケンキュウ 2

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Abstract

The changes of concentrations of Na and Cl in the haemolymph of fourth instar larvae of Culex pipiens pallens Coquillet, Culex pipiens molestus Forskal, Aedes albopictus Skuse and Aedes togoi Theobald, which were caused by treatment with artificial sea waters of various concentrations, were measured by radioactivation analysis. C. p. pallens showed no salt regulation (Fig. 1), but those reared in 20% sea water from first to fourth instar acquired a little ability of the salt regulation (Fig. 6). C. p. molestus was superior a little to C. p. pallens in salt regulation (Fig. 2), and A. albopictus was much more superior than the formers (Fig. 3). A. togoi reared in fresh water has an excellent ability of salt regulation (Fig. 4). In the highly concentrated 140% sea water, Na and Cl increased to the maximum values in about 10 hours. After 22 hours they decreased to ordinary concentrations (Fig. 5). This phenomenon shows that the additional strong function of salt regulation is prepared in 10 hours by their acclimation to the highly concentrated sea water. Water temperature renders much influence for the larvae to aquire this function. The concentrations of Na and Cl changed at different rates, and Cl always changed faster than Na.

Journal

Medical Entomology and Zoology

Medical Entomology and Zoology 27 (4), 405-410, 1976

The Japan Society of Medical Entomology and Zoology

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