邛海鱼类区系的形成及其演变

本文作者根据50-60年代的调查,分析和探讨了邛海的自然鱼类区系形成同演变的规律.并对其形成提出了应从四个方面去认识:(1)雅砻江原来向南的流向;(2)长江上游的袭夺;(3)喜马拉雅山的造山运动.(4)高原地势和平原气候的渗合.对其演变分析了四种趋向:(1)流水性种类消失,(2)鱼类食性中植物性比重加大;(3)肉食性鱼类比重加大;(4)出现了种一级的分化.提出邛海与程海在鱼类区系上可列为同一类型,可与除程海以外的其它云南高原湖泊所属的另一类型相对比.并对Worthington(1940)提出的关于种的分化论点作了补充.

FORMATION AND EVOLUTION OF FISH FAUNA OF QIONGHAI LAKE

Analysis on the formation and evolution of the fish fauna it made on the basis of the first hand survey during 1950-1960 on the fishes of the great Qionghai Lake located at the western-northern corner of Sichuan province and eastern border of the Hang Range, which abounds with animals and plants, The formation of the fish fauna can be analyzed :n four ways: (1) the original flowing line of the Yalong River; ( 2 ) the wresting of the upper reach of the Yangtze River; (3) the Himalayan orogenic movement; ( 4 ) the mixture of plateau geography and plain climate; The evolution of the fish fauna can be shown in four tendencies; (1) Flowing water fishes disappear; ( 2 ) The ratio of plants in the food composition in fishes enlarges; ( 3 ) The species of canivorus fishes increases; ( 4 )Specific differentiation in fishes appears. In view of the above analysis, specific differentiation of species by Worthington ( 1940 ) should be subtantiated.