Identification of optimum scopes of environmental factors for snails using spatial analysis techniques in Dongting Lake Region, China

Particle and Fibre Toxicology

Qing-Wu Jiang⁶  Jia-Bian You²  Bin Cai⁷  Zhong He¹  Xiu-Xia Song⁶  Guang-Hui Ren⁴  Ashley Coatsworth⁵  Song Liang³  Sheng-Bang Zheng⁶  Lin-Han Li⁶  Yi-Biao Zhou⁶  Jin-Yi Wu⁶ 

[1] Junshan office of Leading Group for Schistosomiasis Control, Yueyang, Hunan province 414000, China;Qianlianghu station for Schistosomiasis Control, Yueyang, Hunan Province 414000, China;Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA;Hunan station for Schistosomiasis Control, Changsha, Hunan Province 410000, China;Department of Epidemiology, College of Public Health and Health Professions, University of Florida, Gainesville, FL, USA;Center for Tropical Disease Research, Fudan University, 138 Yi Xue Yuan Road, Shanghai 200032, China;Junshan station for Schistosomiasis Control, Yueyang, Hunan Province 414000, China

关键词: GWR;    Spatial clustering;    Environmental factors;    Oncomelania hupensis;    Schistosomiasis japonica;   

Others  :  806829
DOI  :  10.1186/1756-3305-7-216

 received in 2014-01-03, accepted in 2014-05-01,  发布年份 2014

【 摘 要 】

Background

Owing to the harmfulness and seriousness of Schistosomiasis japonica in China, the control and prevention of S. japonica transmission are imperative. As the unique intermediate host of this disease, Oncomelania hupensis plays an important role in the transmission. It has been reported that the snail population in Qiangliang Lake district, Dongting Lake Region has been naturally declining and is slowly becoming extinct. Considering the changes of environmental factors that may cause this phenomenon, we try to explore the relationship between circumstance elements and snails, and then search for the possible optimum scopes of environmental factors for snails.

Methods

Moisture content of soil, pH, temperature of soil and elevation were collected by corresponding apparatus in the study sites. The LISA statistic and GWR model were used to analyze the association between factors and mean snail density, and the values in high-high clustered areas and low-low clustered areas were extracted to find out the possible optimum ranges of these elements for snails.

Results

A total of 8,589 snail specimens were collected from 397 sampling sites in the study field. Besides the mean snail density, three environmental factors including water content, pH and temperature had high spatial autocorrelation. The spatial clustering suggested that the possible optimum scopes of moisture content, pH, temperature of the soil and elevation were 58.70 to 68.93%, 6.80 to 7.80, 22.73 to 24.23°C and 23.50 to 25.97 m, respectively. Moreover, the GWR model showed that the possible optimum ranges of these four factors were 36.58 to 61.08%, 6.541 to 6.89, 24.30 to 25.70°C and 23.50 to 29.44 m, respectively.

Conclusion

The results indicated the association between snails and environmental factors was not linear but U-shaped. Considering the results of two analysis methods, the possible optimum scopes of moisture content, pH, temperature of the soil and elevation were 58.70% to 68.93%, 6.6 to 7.0, 22.73°C to 24.23°C, and 23.5 m to 26.0 m, respectively. The findings in this research will help in making an effective strategy to control snails and provide a method to analyze other factors.

【 授权许可】

   
2014 Wu et al.; licensee BioMed Central Ltd.

【 图 表 】

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