Scaling of the Ballistic Tongue Apparatus in Chameleons
Scaling of the Ballistic Tongue Apparatus in Chameleons
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DOI：
10.1002/jmor.20053
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发表时间：
2012-11-01
影响因子：
1.5
通讯作者：
Deban, Stephen M.
中科院分区：
文献类型：
--
作者：
Anderson, Christopher V.;Sheridan, Thomas;Deban, Stephen M.
生物体的尺寸可以对其功能和结构特性产生深远的影响。我们研究了7属23种105只变色龙标本的摄食器官的形态比例，跨越了1,000倍的体重范围，以测试摄食器官是否符合几何相似性的零假设，该假设是基于其他变温脊椎动物中几何相似性的普遍性。我们使用了一个复合系统发育假说的基础上，以确定种间缩放模式的摄食器的遗传校正回归分析。我们还确定了种内（个体发育）缩放模式的摄食器在三个物种。我们发现，无论是种内和种间，肌肉骨骼组成部分的喂养装置规模之间的等距，独立的体长。因此，无论总体长度如何，喂食装置都具有保守的比例。与此相反，我们发现，舌器作为一个整体，其肌肉骨骼组件规模与负异速生长相对于口鼻排气长度较小的个人有一个proportionalgreater喂养装置比较大的个人，无论是在物种内和物种之间。最后，舌器作为一个整体的规模与负异速生长相对于身体质量通过个体发育，但种间等距。我们认为，所观察到的异速生长可能是由自然选择，因为在小的身体尺寸放大的摄食器可以最大限度地提高投影距离和猎物的大小，更小的动物具有更高的质量特定的代谢率可以捕获。J. Morphol. 273：1214-1226，2012. (C)2012 Wiley Periodicals，Inc.
Body dimensions of organisms can have a profound impact on their functional and structural properties. We examined the morphological proportions of the feeding apparatus of 105 chameleon specimens representing 23 species in seven genera, spanning a 1,000-fold range in body mass to test whether the feeding apparatus conforms to the null hypotheses of geometric similarity that is based on the prevalence of geometric similarity in other ectothermic vertebrates. We used a phylogenetically corrected regression analysis based on a composite phylogenetic hypothesis to determine the interspecific scaling patterns of the feeding apparatus. We also determined the intraspecific (ontogenetic) scaling patterns for the feeding apparatus in three species. We found that both intraspecifically and interspecifically, the musculoskeletal components of the feeding apparatus scale isometrically among themselves, independent of body length. The feeding apparatus is thus of conserved proportions regardless of overall body length. In contrast, we found that the tongue apparatus as a whole and its musculoskeletal components scale with negative allometry with respect to snout-vent length-smaller individuals have a proportionately larger feeding apparatus than larger individuals, both within and among species. Finally, the tongue apparatus as a whole scales with negative allometry with respect to body mass through ontogeny, but with isometry interspecifically. We suggest that the observed allometry may be maintained by natural selection because an enlarged feeding apparatus at small body size may maximize projection distance and the size of prey that smaller animals with higher mass-specific metabolic rates can capture. J. Morphol. 273:1214-1226, 2012. (C) 2012 Wiley Periodicals, Inc.