Study on morphologic quantitative characteristics of Oncomelania hupensis Ⅰ. Relationshi p between reliability of information of genetic diversity and sample size
- VernacularTitle:湖北钉螺数量性状研究Ⅰ.遗传变异信息的可靠性与样本量的关系
- Author:
Yibiao ZHOU
;
Qingwu JIANG
;
Genming ZHAO
;
Jianguo WEI
;
- Publication Type:Journal Article
- Keywords:
Oncomelania hupensis;
Quantitative characteristics;
Genetic diversity;
Sample size
- From:
Chinese Journal of Schistosomiasis Control
1989;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the relati onship between the reliability of information of genetic diversity and sample si ze in morphologic quantitative characteristics of Oncomelania h upensis. Methods Sixty snails ( smooth shell) from Dali City, Yunnan Province and sixty snails (ribbed shell) f rom Yueyang City, Hunan Province were sampled at random, and the morphologic qua ntitative characteristics of the snails were measured, and then the coefficient of variation, proportion of variation between the two groups and Shannon's infor mation index were computed respectively. Results Among 11 indices of morphologic quantitative characteristics, the coefficient of variation of thickness of labra brim was th e largest, and those of ribbed-shell and smooth-shell population were 20.57% and 14.14% respectively, and the next was length of hypo-body whorl, and those of ri bbed-shell and smooth-shell snails were 12.98% and 11.49% respectively. Amon g 11 morphologic quantitative characteristics indices, there were nearly three out of four indices which the coefficients of variation of ribbed-shell snails were m o re than those of smooth-shell population, and the average coefficient of variat i on of ribbed-shell population was also more than those of smooth-shell populat io n. The average Shannon's information indices of ribbed-shell and smooth-shell po pulation were 1.541 and 1.220 respectively, and the former was the bigger. Whe n the sample size was less than 30, the result of genetic diversity gained from th e study was not very reliable, and with the increase of sample size the reliabil ity of the information of genetic diversity was also augmented. When the sample size was more than 55, the result of genetic diversity was reliable. Conclusion In order to get reliable information of genetic variation in the study of morphologic quantitative charac-teristics of Oncomelania hupensis, at least 55 individual s should be investigated for each population.
