20.A low number of algal cells in the presence of a high number of grazers suggested,but did not prove,that the grazers had removed most of the algae。
在存在大量食草动物的同时却只有少量的水藻花粉囊,这暗示出但没能证明食草动物已吞噬了大部分水藻。
21.Studies by Hargrave and Geen estimated natural community graz-ing rates by measuring feeding rates of individual zooplankton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers。
由哈格雷夫和吉恩所进行的研究,对自然条件下的群落食草比例进行了估计,其手段是通过测量出实验室内单独的浮游动物种类的结食比例,然后利用已知的食草动物种群密度,计算出实地状况下的群落食草比例。
22.In the periods of peak zooplankton abundance,that is,in the late spring and in the summer,Haney recorded maximum daily com-munity grazing rates,for nutrient-poor lakes and bog lakes,respectively,of 6。6 percent and 114 percent of daily phytoplankton production。
在浮游动物数量激增的高峰期,亦即在春季后期以及夏季,哈尼记录了最大程度上的每日群落食草比率,对于营养物不充足的湖和沼泽湖而言,分别为每日浮游植物繁殖量的6。6%和114%。
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