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VERTICAL DISTRIBUTION OF CHAETOGNATHS IN THE EAST CHINA SEA IN SUMMER OF 1978 PROCESS AND DRIVING FORCES OF ADVERSE SEPARATION OF THE DISTRIBUTING AREA OF WILD RICE AND RICE ( O.sativa .L)DURING PAST 2000 YEARS Ⅰ.RELATIONSHIP BETWEEN THE DISTRIBUTING AREA OF WILD RICE AND RICE ( O.sativa. L)AND POPULATION DISTRIBUTION IN A