【摘要】 目的探讨中国大陆钉螺种群内螺壳形态数量性状变异的空间分布特点。方法采集21个现场螺点的钉螺种群标本,分析形态多样性指数和钉螺种群内个体间的欧氏距离在空间上的分布。结果形态多样性指数和钉螺种群内个体间的欧氏距离均与经度明显相关,相关系数分别为0.719(P<0.01)和0.662(P<0.01),而与纬度均无明显相关性(P均>0.05);当纬度>29°时,这两个指标都随着经度的增加有逐渐增加的趋势,当经度为117°时达到高峰,以后又迅速下降。结论中国大陆钉螺种群内螺壳形态数量性状变异存在明显的空间分布特点。更多还原

【Abstract】 Objective To explore the geographic pattern of morphologic variation within snail populations across the mainland of China. Methods Twenty-one snail populations from the different regions were collected, and Shannon-Winer index and Euclidean distances within populations were used to analyze the spatial distribution of morphologic variation of Oncomelania hupensis. Results Longitude correlated significantly with Shannon-Winer index and Euclidean distances within populations, and the correlation coefficients were 0.719(P<0.01)and 0.662(P<0.01)respectively. However, latitude did not correlate significantly with them. In the regions with latitude more than 29°, Shannon-Winer index and Euclidean distances increased with the increasing longitude, and peaked when longitude reached 117°, and then decreased rapidly with the increasing longitude. Conclusion Morphologic variation within snail populations exhibites the pronounced characteristics of spatial distribution across the mainland of China.更多还原