[Spatial distribution pattern of Oncomelania hupensis population in marshland and lake area].
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.
Zhou
Yi-Biao
YB
Department of Epidemiology, School of Public Health, Fudan University-Key Laboratory of Public Health Safety, Ministry of Education, Shanghai 200032, China.
Chen
Geng-Xin
GX
Peng
Wen-Xiang
WX
Zhang
Zhi-Jie
ZJ
Zhuang
Jian-Lin
JL
Cui
Dao-Yong
DY
Ni
Ying
Y
Zhao
Gen-Ming
GM
Wei
Jian-Guo
JG
Jiang
Qing-Wu
QW
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