Functional evolution of the feeding system in rodents.
Functional evolution of the feeding system in rodents.
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DOI：
10.1371/journal.pone.0036299
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Jeffery N
中科院分区：
文献类型：
--
作者：
Cox PG;Rayfield EJ;Fagan MJ;Herrel A;Pataky TC;Jeffery N
啮齿类动物的咀嚼肌已经进化到能够啃咬门牙和咀嚼臼齿。特别是咬肌是高度专业化的，向前延伸，起源于喙。所有现存的啮齿类动物都以三种方式之一实现了咬肌扩张，这三种方式被称为sciuromorph，hystricomorph和myomorph条件。在这里，我们使用有限元分析（FEA）来研究这三种形态的生物力学意义，在松鼠，豚鼠和大鼠。特别是，我们希望确定这三种形态中的每一种是否更适合啃食或咀嚼。结果表明，松鼠是更有效的肌肉咬合力传递过程中的门牙啃比豚鼠，豚鼠是更有效的磨牙咀嚼比松鼠。这与松鼠啃食坚果和种子以及豚鼠用磨牙磨碎的草的已知饮食相匹配。令人惊讶的是，研究结果还表明，大鼠比松鼠和豚鼠更有效，也更多才多艺。似乎没有妥协的咬效率，以适应更广泛的食物和更普遍的喂养行为所采取的大鼠。我们的研究结果表明，头骨和咀嚼肌的形态允许松鼠专门作为啃食者和豚鼠作为咀嚼者，但大鼠是高性能的多面手，这有助于解释它们作为一个群体的压倒性成功。
The masticatory musculature of rodents has evolved to enable both gnawing at the incisors and chewing at the molars. In particular, the masseter muscle is highly specialised, having extended anteriorly to originate from the rostrum. All living rodents have achieved this masseteric expansion in one of three ways, known as the sciuromorph, hystricomorph and myomorph conditions. Here, we used finite element analysis (FEA) to investigate the biomechanical implications of these three morphologies, in a squirrel, guinea pig and rat. In particular, we wished to determine whether each of the three morphologies is better adapted for either gnawing or chewing. Results show that squirrels are more efficient at muscle-bite force transmission during incisor gnawing than guinea pigs, and that guinea pigs are more efficient at molar chewing than squirrels. This matches the known diet of nuts and seeds that squirrels gnaw, and of grasses that guinea pigs grind down with their molars. Surprisingly, results also indicate that rats are more efficient as well as more versatile feeders than both the squirrel and guinea pig. There seems to be no compromise in biting efficiency to accommodate the wider range of foodstuffs and the more general feeding behaviour adopted by rats. Our results show that the morphology of the skull and masticatory muscles have allowed squirrels to specialise as gnawers and guinea pigs as chewers, but that rats are high-performance generalists, which helps explain their overwhelming success as a group.
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DOI：
10.1111/j.1096-3642.1971.tb00754.x
发表时间：
1971-01-01
影响因子：
2.8
作者：
HIIEMAE, K
通讯作者：
HIIEMAE, K
影响因子：
2.8
作者：
Eng, C. M.;Ward, S. R.;Taylor, A. B.
通讯作者：
Taylor, A. B.
DOI：
10.1002/ar.21358
发表时间：
2011-04-01
影响因子：
2
作者：
Bright, Jen A.;Rayfield, Emily J.
通讯作者：
Rayfield, Emily J.
影响因子：
4.1
作者：
Adkins, RM;Walton, AH;Honeycutt, RL
通讯作者：
Honeycutt, RL
影响因子：
10.7
作者：
Huchon, D;Madsen, O;Douzery, EJP
通讯作者：
Douzery, EJP