【摘要】 根据太湖1973～2002年的鱼类分类产量统计资料,应用逐步回归分析方法,研究了太湖主要鱼类产量变化对银鱼的影响。结果表明:太湖银鱼和主要鱼类产量间的最优化回归模型为W=225.084 3+1.486 0 W3+0.087 7 W7(W为银鱼产量,W3为鲌鱼产量,W7为其他鱼类产量,n=30,R=0.868 0,P<0.000 1)。通径分析结果表明:鲌鱼对银鱼产量变化影响最大,其次是“其他鱼类,”其通径系数分别为:Py.3=0.890 8,P<0.000 1,Py.7=0.388 7,P=0.000 6。而鲚鱼、鲤鲫鱼、鲢鳙鱼、青草鱼产量变化对银鱼的影响不显著。更多还原

【Abstract】 Based on the statistics of fish catches from 1973 to 2002 in Lake Taihu,with the methods of stepwise regression analysis and path analysis,the effects of catches of main fishes on the changes of catches of ice fishes in Lake Taihu had been studied.The results showed that: the optimization regression model was W=225.084 3+1.486 0W3+0.0877W7(n=30,R=0.836 4,P<0.000 1),and the results of path analysis were: the catches of topmouth culter have the maximal effects on catches of ice fishes,and the catches of other fishes follow that.The path coefficient respectively was Py.3=0.890 8,P<0.000 1 and Py.7=0.388 7,P=0.000 6.更多还原