Ecological studies on mosquitoes in the bamboo groves of Tochigi Prefecture : IV. Mosquito larvae in the bamboo groves in summer

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  • 栃木県の竹林における蚊の生態学的研究 : 第 4 報夏季の竹林における蚊幼虫
  • 栃木県の竹林における蚊の生態学的研究-4-
  • トチギケン ノ チクリン ニ オケル カ ノ セイタイガクテキ ケンキュウ 4

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In August, 1957, the writer made the investigation on the mosquito larvae in the 'Mosochiku' bamboo stumps, the split 'Mosochiku' bamboos and the 'Madake' bamboo stumps in and around Utsunomiya. 1. From the 'Mosochiku' stumps, 1, 050 larvae belonging to three genera and five species were collected. Of these, Aedes flavopictus was the largest in unmber, 53.4% of the total larvae, Tripteroides bambusa 33.7%, Armigeres subalbatus and Ae. albopictus was few, and Ae. japonicus was the least. 2. Many larvae were found in the split bamboos and 863 larvae blonging to three genera and four species were collected from three split 'Mosochiku' bamboos. Of these, Ae. flavopicus was the largest in number, 36.6% of the total. Ar. subalbatus followed it, and Ae. albopictus and Tr. bambusa were collected few. 3. The larval fauna of the mosquitoes in the 'Madake' bamboo stumps was poor, and the number of species and individuals was by far smaller than that in the 'Mosochiku' bamboo stumps. 4. 12 kinds and 86 larval associations were formed in the 'Mosochiku' stumps. Of these, Ae. flavopictus associations and Tr. bambusa-Ae. flavopictus associations were the largest in number. Seven kinds and 13 larval associations were formed in the split 'Mosochiku' bamboos. Of these, Ae. flavopictus-Ar. subalbatus associations and Ae. flavopictus-Ae. albopictus-Ar. subalbatus associations were the largest in number. Four kinds and 22 associations were formed in 'Madake' bamboo stumps. Of these, Ae. flavopictus-Ae. albopictus associations were the largest in number. 5. The phenomenon of "habitat segregation" between Ae. flavopictus and Ae. albopictus was not found out in the present investigation on the 'Mosochiku' stumps, the split 'Mosochiku' and the 'Madake' stumps just as in the previous reports.

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