Ecomorphological analysis of the astragalo-calcaneal complex in rodents and inferences of locomotor behaviours in extinct rodent species.
Ecomorphological analysis of the astragalo-calcaneal complex in rodents and inferences of locomotor behaviours in extinct rodent species.
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DOI：
10.7717/peerj.2393
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发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
Vianey-Liaud M
中科院分区：
文献类型：
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作者：
Ginot S;Hautier L;Marivaux L;Vianey-Liaud M
将哺乳动物的颅后形态与运动联系起来的研究很常见。然而，这类研究大多局限于啮齿类动物的海绵体。我们在这里提供了来自不同科的数据，属于三个主要的啮齿动物群体(石鼠总科、肌齿目和线虫)。这项研究的目的是定义黄芪和跟骨的形态指标，以允许对啮齿动物的运动行为做出推断。对几个标本进行了解剖和描述，以连接腿部肌学和感兴趣骨骼的形态。骨学特征被描述、比较、机械解释，并与包括与生活方式和运动(跳跃、曲度、多面手、化石、攀登者和半水上运动)相关的六个类别的“功能序列”相关联。一些特征状态是这些类别中的一些典型，特别是树栖攀缘植物、化石和“花序跳跃”分类群。这种可靠的特征可能被用来推断灭绝物种的运动行为。线性判别分析(LDAS)用于更广泛的物种样本，并表明黄星状和跟骨特征可用于区分现存物种的类别，而对灭绝物种的后验推断应谨慎检验。
Studies linking postcranial morphology with locomotion in mammals are common. However, such studies are mostly restricted to caviomorphs in rodents. We present here data from various families, belonging to the three main groups of rodents (Sciuroidea, Myodonta, and Ctenohystrica). The aim of this study is to define morphological indicators for the astragalus and calcaneus, which allow for inferences to be made about the locomotor behaviours in rodents. Several specimens were dissected and described to bridge the myology of the leg with the morphology of the bones of interest. Osteological characters were described, compared, mechanically interpreted, and correlated with a “functional sequence” comprising six categories linked to the lifestyle and locomotion (jumping, cursorial, generalist, fossorial, climber and semi-aquatic). Some character states are typical of some of these categories, especially arboreal climbers, fossorial and “cursorial-jumping” taxa. Such reliable characters might be used to infer locomotor behaviours in extinct species. Linear discriminant analyses (LDAs) were used on a wider sample of species and show that astragalar and calcaneal characters can be used to discriminate the categories among extant species whereas a posteriori inferences on extinct species should be examined with caution.