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资料分析: 资料一 将大草履虫和核草履虫分别单独培养,其数量变化如图1所示,混合培养时的数量变化如图2所示(这两种草履虫都没有分泌杀死对方的物质)。 资料二 研究人员在90多年的时间里,对生活在加拿大北方森林中的猞猁和雪兔的种群数量做了研究,结果如图3所示。 (1)资料一说明大草履虫和核草履虫之间的关系是 ,产生这种关系的主要因素是 。 (2)分析猞猁和雪兔种群数量的波动情况,你能发现什么规律? 。 (3)资料一和资料二中,两个种群间的相互作用结果有什么不同? 。
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