著者

津田 良夫 助廣 那由 梅澤 昌弘 稲垣 俊一 村上 隆行 木田 中 土屋 英俊 丸山 浩 沢辺 京子

出版者

日本衛生動物学会

雑誌

衛生動物 (ISSN:04247086)

巻号頁・発行日

vol.64, no.4, pp.209-214, 2013-12-25 (Released:2014-06-25)

参考文献数

13

被引用文献数

1 2

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Experiments exposing Aedes aegypti to winter conditions were conducted at Narita International Airport, Japan during December 2012 to March 2013 to evaluate the possible overwintering of the species. Four and 2 study sites were selected inside and outside the terminal buildings, respectively, and air temperature and relative humidity were recorded hourly at each site. Eggs were placed for 91 or 63 days at each study site, respectively, and the hatching rate and adult emergence rate were examined in March 2013. Under outdoor conditions (daily average of 5.2°C and 57.3%R.H.), 6% of the exposed eggs hatched but no adults emerged. Eggs exposed to indoor conditions (daily average of 14.3–19.4°C and 34.3–36.8%R.H.) showed 2 to 8% adult emergence. Exposure experiments using larvae were conducted for 1 week every month, and their development and survival rate were observed. Under outdoor conditions in January and February 2013, all the exposed larvae died within a week. Larvae placed inside the terminal building developed well and the threshold temperature for larval development was estimated as 10.6°C and 11.6°C for hatched larvae and 4-day-old larvae, respectively.

著者

津田 良夫 石田 恵一 山内 繁 新妻 淳 助廣 那由 梅澤 昌弘 柳 大樹 岡本 徳子 沢辺 京子

出版者

日本衛生動物学会

雑誌

衛生動物 (ISSN:04247086)

巻号頁・発行日

vol.64, no.3, pp.175-181, 2013-09-15 (Released:2014-03-15)

参考文献数

15

被引用文献数

1 1

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The distributions and abundance of mosquitoes were examined in 2012 in rice-field areas in north-eastern Japan where the tsunami caused by the Great East Japan Earthquake in March 2011 destroyed man-made as well as natural environments completely. Three study sites were selected for the mosquito study; southern Miyagi Prefecture, and northern and southern Fukushima Prefecture. Monthly mosquito collections were conducted by CO2 traps and the density was compared between the “Tsunami” area and “No tsunami” area. A total of 8,079 adults of 12 species in 7 genera were collected and Culex pipiens group, Cx. inatomii, and Aedes albopictus were dominant. The difference in adult density between the Tsunami area and No tsunami area was still significant for the dominant mosquitoes in 2012, the 2nd year after the tsunami disaster. The adult density in 2012 was significantly lower than that in the previous year; however, Cx. pipiens group and Cx. inatomii reached a high density of 100 and 30 females per trap per day, respectively, in July or August 2012, indicating that the outbreaks of these mosquitoes occurred again in tsunami areas in 2012. Mosquito larvae were found in 22 to 57% of water bodies examined in the tsunami area.