A preliminary analysis of correlations between chewing motor patterns and mandibular morphology across mammals.
A preliminary analysis of correlations between chewing motor patterns and mandibular morphology across mammals.
复制标题
哺乳动物咀嚼运动模式与下颌形态之间相关性的初步分析。
DOI：
10.1093/icb/icr066
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发表时间：
2011
影响因子：
2.6
通讯作者：
Hylander,WilliamL
中科院分区：
文献类型：
--
作者：
Vinyard,ChristopherJ;Williams,SusanH;Wall,ChristineE;Doherty,AlisonH;Crompton,AlfredW;Hylander,WilliamL
关于哺乳动物摄食的生理数据库的建立，即摄食实验终端用户数据库(FEED)的建立，以及对哺乳动物系统发育重建的改进，极大地提高了我们解决关于哺乳动物摄食进化的长期问题的能力。在这项研究中，我们使用比较系统发育的方法，研究了6目19种哺乳动物的下颌粗壮程度与浅咬肌、深咬肌和颞肌的相对募集和相对活动高峰时间的相关性。我们发现，几乎没有证据表明哺乳动物的颌骨粗壮程度和表层咬肌或颞肌的肌电活动之间存在联系。我们假设，未来的分析可能会在具有相似饮食、摄食行为和/或系统发育史的哺乳动物亚群中确定这些生理和形态变量之间的显著关联。或者，平衡侧(即非咀嚼侧)深咬肌(BDM)的相对峰值招募和时间与我们的哺乳动物样本中下颌联合的相对面积显著负相关。尽管与有蹄类动物相比，灵长类动物的BDM活动与不同的加载方式有关，但这种关系仍然存在，这表明这些哺乳动物之间的联合负载的大小和联合面积之间存在基本的关联。由于我们的样本主要代表在咀嚼过程中使用显著横向运动的哺乳动物，因此未来的研究应该解决BDM活动和联合形态之间的相关性是否适用于所有哺乳动物，还是应该仅限于这一“横向咀嚼”群体。最后，在这项研究中观察到的显著相关性表明，生理参数是整个哺乳动物摄食的一个完整和不断演变的组成部分。
The establishment of a publicly-accessible repository of physiological data on feeding in mammals, the Feeding Experiments End-user Database (FEED), along with improvements in reconstruction of mammalian phylogeny, significantly improves our ability to address long-standing questions about the evolution of mammalian feeding. In this study, we use comparative phylogenetic methods to examine correlations between jaw robusticity and both the relative recruitment and the relative time of peak activity for the superficial masseter, deep masseter, and temporalis muscles across 19 mammalian species from six orders. We find little evidence for a relationship between jaw robusticity and electromyographic (EMG) activity for either the superficial masseter or temporalis muscles across mammals. We hypothesize that future analyses may identify significant associations between these physiological and morphological variables within subgroups of mammals that share similar diets, feeding behaviors, and/or phylogenetic histories. Alternatively, the relative peak recruitment and timing of the balancing-side (i.e., non-chewing-side) deep masseter muscle (BDM) is significantly negatively correlated with the relative area of the mandibular symphysis across our mammalian sample. This relationship exists despite BDM activity being associated with different loading regimes in the symphyses of primates compared to ungulates, suggesting a basic association between magnitude of symphyseal loads and symphyseal area among these mammals. Because our sample primarily represents mammals that use significant transverse movements during chewing, future research should address whether the correlations between BDM activity and symphyseal morphology characterize all mammals or should be restricted to this “transverse chewing” group. Finally, the significant correlations observed in this study suggest that physiological parameters are an integrated and evolving component of feeding across mammals.