Character displacement and ecomorphological analysis of two long-eared Myotis (M auriculus and M evotis)
Character displacement and ecomorphological analysis of two long-eared Myotis (M auriculus and M evotis)
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DOI：
10.1644/05-mamm-a-140r1.1
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发表时间：
2006-02-01
影响因子：
1.7
通讯作者：
Rácz, GR
中科院分区：
文献类型：
--
作者：
Gannon, WL;Rácz, GR
应用生态形态学方法对耳蝠和鼠耳蝠的生态关系进行了研究。Evotis。我们成像的颌骨和头骨的242个标本从20个地方的范围内的两个类群，强调其西南地区的同域。利用传统的形态测量和几何形态测量方法，从两个物种的牙齿的字符值进行了详细的分析。这两种方法检测字符位移，并允许LIS检测两个物种内的颌骨大小和形状的差异。同域种群中颌骨形状的形态差异更加突出。evotis比M.耳廓这可能表明竞争选择作用更强. Evotis。在同域分布区，M. Evotis显示出向更专门的营养状态的转变，其营养结构（更高位置的关节突和强壮的臼齿）可能更善于捕捉甲虫，而M.耳形目昆虫在捕捉蛾类等软体动物方面可能具有更大的优势。而M的关节突相对于齿列的位置较低。耳廓而且这个物种下颚的形状表明咬合力较弱，剪切力较大，张口较宽.所有的形状差异，强调在同域分布，确认积极的竞争这2个物种之间的相互作用。
Ecomorphological analysis was used to evaluate ecological relationships between 2 species of bats, Myotis auriculus and M. evotis. We imaged jaws and skulls of 242 specimens from 20 localities within the range of both taxa, emphasizing their Southwestern regional area of sympatry. Using traditional morphometric and geometric morphometric methods, values for characters taken from dentaries of both species were analyzed in detail. Both methods detected character displacement and allowed LIS to detect differences in jaw size and shape within both species. The morphological difference in jaw shape is more emphasized within sympatric populations of M. evotis than in M. auriculus. This may indicate that competitive selection acts more oil M. evotis. At sympatric localities, M. evotis displayed a shift to a more specialized trophic state with a trophic architecture (more highly placed articular process and robust molars) likely better at capturing beetles, whereas M. auriculus may have a greater advantage for capturing soft-bodied prey such as moths. Oil the other hand, the articular process is located lower relative to the toothrow of the dentary in M. auriculus. Also the shape of the jaw in this species Suggests a weaker bite, more shearing force, and wider gape. All shape differences in jaw morphology are emphasized in sympatry, confirming active competitive interactions between these 2 species.