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Evolutionary stasis, constraint and other terminology describingevolutionary patterns

机译:演化停滞,约束和描述演化模式的其他术语

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Current use of terms to describe evolutionary patterns is vague and inconsistent. In this paper, logical definitions of terms that describe specific evolutionary patterns are proposed. Evolutionary inertia is defined in a manner analogous to inertia in physics. A character in a static state of evolutionary inertia represents evolutionary stasis while a character showing consistent directional evolutionary change represents evolutionary thrust. I argue that evolutionary stasis should serve as the null hypothesis in all character evolution studies. Deviations from this null model consistent with alternative hypotheses (e.g. random drift, adaptation) can then give us insight into evolutionary processes. Failure to reject a null hypothesis of evolutionary stasis should not be used as a serious explanation of data. The term evolutionary constraint is appropriate only when a selective advantage for a character state transition is established but this transition is prevented by specific, identified factors. One type of evolutionary constraint discussed is evolutionary momentum. A final pattern of evolutionary change discussed is closely related to evolutionary thrust and is referred to as evolutionary acceleration. I provide examples of how this set of definitions can improve our ability to communicate interpretations of evolutionary patterns.
机译:当前使用术语来描述进化模式是模糊且不一致的。在本文中,提出了描述特定进化模式的术语的逻辑定义。演化惯性的定义类似于物理学中的惯性。处于进化惯性静止状态的角色代表演化停滞,而表现出一致的方向演化变化的角色则代表进化推力。我认为在所有角色进化研究中,进化停滞应作为无效假设。然后,与其他假设(例如随机漂移,适应)相一致的这种零模型的偏差可以使我们深入了解进化过程。未能拒绝进化停滞的零假设不能被用作对数据的认真解释。仅当确立了角色状态转换的选择优势但特定的,已识别的因素阻止了这种转换时,术语“进化约束”才适用。讨论的一种进化约束类型是进化动量。讨论的进化变化的最终模式与进化推力密切相关,被称为进化加速。我提供了一些示例,说明这套定义如何提高我们交流进化模式解释的能力。

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