Identification of factors affecting Oncomelania hupensis density in Eastern Dongting Lake regions
10.16250/j.32.1374.2021121
- VernacularTitle:东洞庭湖区钉螺密度影响因素研究
- Author:
Ying-Yan ZHENG
1
;
Na ZHANG
1
;
Zheng-Zhong WANG
1
;
Ying XIONG
1
;
Ying SHI
1
;
Chun-Lin LI
1
;
Yi-Xin TONG
1
;
Feng JIANG
1
;
Jie ZHOU
2
;
Zhong HE
2
;
Jie JIANG
2
;
Wen GUO
2
;
Qing-Wu JIANG
1
;
Yi-Biao ZHOU
1
Author Information
1. Department of Epidemiology, School of Public Health, Fudan University, Key Laboratory of Public Health Safety, Ministry of Education, Tropical Disease Research Center, Shanghai 200032, China
2. Junshan County Station for Schistosomiasis Control, Yueyang City, Hunan Province, China
- Publication Type:Journal Article
- Keywords:
Schistosomiasis;
Oncomelania hupensis;
Water pollutant;
Linear mixed model
- From:
Chinese Journal of Schistosomiasis Control
2021;33(5):457-463
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the impact of water pollutants, water levels and meteorological factors on the Oncomelania hupensis density in Eastern Dongting Lake regions, so as to provide insights into schistosomiasis control. Methods O. hupensis snails were surveyed using a systematic sampling method in snail-infested marshlands in Eastern Dongting Lake regions from 2007 to 2014, and data pertaining to water pollutants, water levels and meteorological factors were collected. The duration of submergence and the date of the start of submergence were calculated. The snail density and its influencing factors were descriptively analyzed, and a linear mixed model was generated to examine the impacts of variables on the snail density. In addition, smooth curves were fitted to investigate the relationship between snail density and variables. Results The snail density appeared a fluctuation in Eastern Dongting Lake regions during the period from 2007 to 2014, with the highest density on October, 2010 (52.79 snails/0.1 m2) and the lowest density on January 2009 (2.15 snails/0.1 m2). Linear mixed-model analysis showed that permanganate index, total phosphorus and the date of the start of submergence affected the snail density (t = 6.386, −2.920 and −3.892, all P values < 0.01). Smooth curve analysis revealed that the associations of the snail density with the permanganate index and total phosphorus appeared an approximately quadratic curve. After the end of April, the earlier date of the start of submergence resulted in a higher snail density. Conclusion Permenganate index, total phosphorus and the date of the start of submergence affect the O. hupensis snail density in Eastern Dongting Lake regions.
