【摘要】 2004年7月对杭州湾南岸慈溪自然滩涂的泥螺种群进行了取样调查,分别采用Taylor幂法则、Iwao聚集格局回归分析法及Morisita指数公式计算和统计分析。结果表明:杭州湾南岸7个样地间泥螺种群密度差异极显著,种群空间格局在局域斑块尺度属于聚集型负二项分布。造成样地间密度差异的主要原因是人为干扰,泥螺种群的空间分布格局主要与滩涂上积水区域呈斑块状分布有关。更多还原

【Abstract】 Population of Bullacta exarata was investigated at southern shore of Cixi City in Hangzhou Bay by Taylor’s power law,Morisita index and Taylor’s power law in July,2004.It was shown that the B.exarata population distributed extensively with clumped and negative binomial distribution theoretically(Morisita index I_δ=（1.13）,F=524.4>F_0.01（6,∞）=2.80).The regression equations of Taylor’s power law and Iwao’s patch regression were lns²=2.0688ln X-1.7971(r²=0.7834,n=7) and m= 1.2163X-0.6565（r²=0.9268,n=7） respectively.The population densities at 7 sample sites in the Hanghzou Bay（No.4 > No.3 > No.2 > No.7 > No.1 > No.5 > No.6） were significantly different by the analysis of variance [One-way ANOVA,F=6.1667> F_0.01（6,63）=3.1028],which were resulted obviously from human activities.The distributing pattern of B.exarata population was attributed to the distribution pattern of the seeper areas.更多还原