震災後の石巻市内におけるハエ類成虫の捕獲成績

抄録

After the Great East Japan Earthquake fly abundance was investigated in the tsunami-devastated area in Ishinomaki, Miyagi Prefecture from early June. The fly infestation level was evaluated by the number of flies captured on sticky sheets (30 cm×30 cm) installed on inside and outside walls of evacuation facilities. The mean outside fly density during 8 to 17 June was 35 flies/sheet/day, and increased to 128 flies during 24 to 30 June. The fly density increased continuously until mid-July when the investigation was relocated to another facility. The maximum fly density was 248 flies/sheet/day during 13 to 19 July. The population density dropped steeply in the end of July and did not increase until mid-October. Species composition of the Family Muscidae exceeded 90% inside the facility from early June to the middle of July. The Family Muscidae also predominated outside, but the composition of the Family Calliphoridae reached 50% in total during 13 to 19 July. Several reasons for the fly reduction were proposed, but the cause remained unclear. Ecological studies on fly population will be required in 2012 to clarify factors determining fly density in the tsunami-devastated areas.