Evolutionary consequences of many-to-one mapping of jaw morphology to mechanics in labrid fishes
Evolutionary consequences of many-to-one mapping of jaw morphology to mechanics in labrid fishes
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DOI：
10.1086/429564
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发表时间：
2005-06-01
影响因子：
2.9
通讯作者：
Wainwright, PC
中科院分区：
文献类型：
--
作者：
Alfaro, ME;Bolnick, DI;Wainwright, PC
许多生理性状由两个层次相关的水平：物理结构和这些结构的新兴功能特性。由于选择倾向于作用于涌现的功能性状，结构表型的进化将取决于形式-功能关系的性质。复杂的生理或生物力学特征通常以多对一映射为特征：许多结构表型可以产生等效功能。我们认为，这种冗余可以促进表型多样性的进化，我们说明了这种效果与一个复杂的生物力学特性，四连杆机构的实验和分析研究相结合的labrid鱼的下巴。我们发现，唇颚是受多对一映射的形式，以颚的机械性能，但某些机械类型有更高的水平比其他形态冗余。这种冗余的变化影响了labrid颌骨形状的多样性和分布：labrid物种不成比例地集中在功能特征具有较高的冗余潜力。多对一映射还可以通过允许物种同时优化多个功能特性来减轻机械权衡所施加的进化限制。多对一作图可能是产生生理性状多样性不均匀模式的一个重要因素。
Many physiological traits consist of two hierarchically related levels: physical structures and the emergent functional properties of those structures. Because selection tends to act on the emergent functional traits, the evolution of structural phenotypes will depend on the nature of the form-function relationship. Complex physiological or biomechanical traits are often characterized by many-to-one mapping: numerous structural phenotypes can yield equivalent functions. We suggest that this redundancy can promote the evolution of phenotypic diversity, and we illustrate this effect with a combination of empirical and analytical studies of a complex biomechanical trait, the four-bar linkage found in the jaws of labrid fishes. We show that labrid jaws are subject to many-to-one mapping of form-to-jaw mechanical properties but that some mechanical types have higher levels of morphological redundancy than others. This variation in redundancy has affected the diversity and distribution of labrid jaw shapes: labrid species are disproportionately concentrated around functional traits with higher potential for redundancy. Many-to-one mapping can also mitigate evolutionary constraints imposed by mechanical trade-offs by allowing a species to simultaneously optimize multiple functional properties. Many-to-one mapping may be an important factor in generating the uneven patterns of diversity in physiological traits.