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- W1484958498 abstract "Objective To understand the distribution and diffusion regularity of Oncomelania and formulate techniques and provide scientific support for Oncomelania monitoring.Methods Ditches 50 cm wide × 30 cm deep were used to square off 666 m2 of unused land in a chessboard pattern at intervals of 2 m2;1 600 imported snails were observed in a certain plot,and the monthly percentage of squares with snails,density of living snails,density of young snails,mating,distribution distance,weather,temperature,humidity,etc.were observed.Result From March to December 2008,the percentage of squares with snails was between 20.00%-38.18%;this percentage was 22.88% for sunny days and 29.24% for cloudy and rainy days(χ2=4.113,P0.05)and 9.38% for unused land and terraces and 35.99% for the sides or bottom of ditches(χ2 = 67.246,P0.01).The percentage of squares with snails was closely related to the weather and environment.Theas indicated by 9 months of observation,changes in squares with snails ranged from 2.17-5.71 snails/square and changes in the density of living snails and young snails of the second generation ranged from 2.03-5.54 snails/square and 0-4.56 snails/square.There were markedly fewer living snails and young snails of the second generation in unused land and terraces than on the sides or bottom of ditches(1.22 and 0.78 snails/square vs.3.72 and 2.82 snails/square).Calculations indicated that Oncomelania took 5 months to enter and produce a second generation mature enough to mate.In the course of observation,snails were not found outside ditch 3,and the farthest distance of unilateral diffusion was 4.5 m.Conclusion Oncomelania was mainly distributed in unused land bordering aquatic areas,e.g.with pools of water,damp areas with adequate moisture such as the sides or bottom of ditches,and along ditches.Imported Oncomelania was active on cloudy and rainy days and was detected rather frequently." @default.
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- W1484958498 date "2009-01-01" @default.
- W1484958498 modified "2023-09-27" @default.
- W1484958498 title "Preliminary observation of imported Oncomelania hupensis distribution and diffusion regularity in areas without snails" @default.
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