title: [Spatial distribution pattern of Oncomelania hupensis population in marshland and lake area].
abstract: OBJECTIVE
  To explore the spatial pattern of the distribution of Oncomelania hupensis population in marshland and lake region.
  
  
  METHODS
  Four bottomlands were selected randomly for the investigation along the Qiupu River in Guichi District, Anhui Province. The quadrats were placed randomly for snail survey, and the mean crowding, mean density, aggregation indices (diffusion coefficient (C), morisita index (Idelta), index of patchiness (m*/m) ), Taylor's power law and Iwao's m*-m regression index were analyzed.
  
  
  RESULTS
  For 4 bottomlands in different time, the diffusion coefficients, Morisita indices, and m*/m indices were all more than one. There was a close linear relationship between the logarithm of the snail density and its variance (P < 0.01), and the correlation coefficient was 0.972. In Taylor's power law, the lg a was 0.602 and b was 1.427. There was a close linear relationship between the mean crowding (m*) and the snail density (m) (P < 0.01), and the correlation coefficient, alpha and beta was 0.984, 2.367 and 1.617 respectively.
  
  
  CONCLUSIONS
  The spatial pattern of Oncomelania hupensis population shows an aggregation distribution in marshland and lake region, and the basic components of snail distribution are in colonies.
authors.affiliation: Department of Epidemiology, School of Public Health, Fudan University-Key Laboratory of Public Health Safety, Ministry of Education, Shanghai 200032, China.
authors.forename: Yi-Biao
authors.initials: YB
authors.lastname: Zhou
authors.forename: Geng-Xin
authors.initials: GX
authors.lastname: Chen
authors.forename: Wen-Xiang
authors.initials: WX
authors.lastname: Peng
authors.forename: Zhi-Jie
authors.initials: ZJ
authors.lastname: Zhang
authors.forename: Jian-Lin
authors.initials: JL
authors.lastname: Zhuang
authors.forename: Dao-Yong
authors.initials: DY
authors.lastname: Cui
authors.forename: Ying
authors.initials: Y
authors.lastname: Ni
authors.forename: Gen-Ming
authors.initials: GM
authors.lastname: Zhao
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Wei
authors.forename: Qing-Wu
authors.initials: QW
authors.lastname: Jiang
mesh_terms: D000818:Animals; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D005618:Fresh Water / Q000469:parasitology; D011156:Population Density; D011157:Population Dynamics; D012908:Snails / Q000254:growth & development*; D053833:Wetlands