RUI: Analysis of the Post-Paleozoic Replacement of Cyclostome by Cheilostome Bryozoans

中生代最显著的大规模变化之一 海洋化石记录是狭唇目的衰落 圆口门和唇口苔藓虫的崛起 在海洋动物群中占主导地位的程度， 被狭纹动物占据 如此大规模的交易， 分类上相关和/或生态上相似的群体可能是由于 竞争性替代，积累“小规模”机会 偶然发生的有利于一个群体的事件，或者 在大规模的屠杀中， 灭绝，其次是辐射的第二次进入 腾出生态空间 圆口动物-唇口动物转换的时间并不 与一次大规模灭绝相对应 竞争性相互作用 在最近的圆口类和唇口类之间， 这表明竞争替代是一个可行的假设。 的 假设将通过预测的影响进行测试， 两个分支之间的竞争，如中生代至早期 新生代化石记录。 这项研究的意义要大得多 比更好地洞察这一模式更重要。 如果测试的 预测支持预测的变化，这应该提供 强有力的证据表明，有机相互作用在 决定宏观进化模式。

One of the conspicuous large-scale changes in the Mesozoic marine fossil record is the decline of the stenolaemate order Cyclostomata and the rise of cheilostome bryozoans to the same approximate level of dominance in marine faunas that had previously been occupied by stenolaemates. Such large-scale turnovers between taxonomically related and/or ecologically similar groups may be due to competitive replacement, to accumulated "small-scale" chance events that by happenstance favor one group over the other, or to the destruction of the formerly dominant group during a mass extinction, followed by the radiation of the second into the vacated ecospace. Timing of the cyclostome-cheilostome turnovers does not correspond with a major mass extinction. Competitive interactions between recent cyclostomes and cheilostomes favor cheilostomes, suggesting that competitive replace is a viable hypothesis. The hypothesis will be tested through predictions of the effects of competition between the two clades as seen in the Mesozoic to early Cenozoic fossil record. Implications of the study are much larger than better insight into this one pattern. If tests of the predictions support the predicted changes, this should provide strong evidence for the importance of organic interactions in determining macroevolutionary patterns.