The Relationship Between Species Diversity of Fish and Basin Characteristics of Main Rivers in the Upper Reaches of the Yangtze River

Abstract

Abstract: The effects of the characteristics of the river basin on species numbers of fish had been studied by using regression analysis and principal components analysis ( PCA) .The number of endemic fishes related positively with the number of all species ( p < 0. 01) .The diversity of all species related positively with basin area ( p < 0. 01) , length of mainstream ( p < 0. 05) , and the average river discharge ( p < 0. 01) respectively; related negatively with the falling
gradient ( p< 0. 05) . The diversity of all species per unit area or per unit length related negatively with length of main stream or basin area ( p< 0. 01) , average river discharge ( p < 0. 05) respect ively; related positively with the falling gradient ( p< 0. 01) , the runfall of the rivers ( p < 0. 01) respectively. There were posit ive significant correlationships among the diversity of endemic f ishes and the basin area ( p < 0. 05) , length of mainstream ( p< 0. 05) , and average river discharge ( p< 0. 01) respectively.The diversity of endemic species per unit area related negatively with length of mainstream ( p < 0. 01) , average river discharge ( p < 0. 05) respectively; related positively with the falling gradient ( p< 0. 01) , the runfall of the rivers ( p < 0. 01) respectively. The diversity of endemic species per unit length related negatively with basin area ( p< 0. 05) ; related positively with the falling gradient ( p< 0. 01) , the runfall of the rivers (p < 0. 01) respectively. The result of PCA showed that the 1st and 2nd principal components revealed correlat ions among relative and absolute numbers of fish species and the characteristics of the river basin respect ively.

Key words: f ish, basin characteristics, rivers, upper reaches of the Yangtze River, statistic analysis

LIU Jun, CAO Wen-Xuan, CHANG Jian-Bo. The Relationship Between Species Diversity of Fish and Basin Characteristics of Main Rivers in the Upper Reaches of the Yangtze River[J]. journal6, 2004, 25(1): 42-47.

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