澳大利亚减肢石龙子的腰形模式及其相关性。

IF 3.8 1区 生物学 Q1 BIOLOGY Proceedings of the Royal Society B: Biological Sciences Pub Date : 2024-10-01 Epub Date: 2024-10-02 DOI:10.1098/rspb.2024.1653
Marco Camaiti, Mark N Hutchinson, Christy A Hipsley, Rocio Aguilar, Jay Black, David G Chapple, Alistair R Evans
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引用次数: 0

摘要

有鳞类动物的缩肢进化是趋同进化的一个典型例子,但与之相关的骨骼形态模式却未得到充分探索。为了深入了解肢体变小对生物力学和发育的影响,我们利用几何形态计量学研究了 90 种肢体变小的石龙子及其全肢近缘种的胸骨和骨盆腰的形态。当前肢消失而后肢保留时,锁骨的形状趋向于前部急弯--这是典型的沙泳动物的形态。这可能是对在精细基质中运动的功能性适应,也可能是完全丧失肢体的发育结果。两个腰带(冠状骨和骨盆)的肢体承载要素的形状与肢体的减少密切相关,当起伏运动取代肢体运动时,肢体承载要素的形状变得更加简化。在缺乏前肢而非后肢的类群中,腰带之间的整合程度降低,这表明针对不同的运动策略对每种腰带进行了不同的选择。然而,当考虑到系统发育历史时,这种模式就不那么清晰了,这可能是因为它仅限于一个特定的支系(Lerista)。我们展示了运动的功能需求如何在生物体组织的不同层次(包括外部和内部结构)引起变化。
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Patterns of girdle shape and their correlates in Australian limb-reduced skinks.

The evolution of limb reduction in squamates is a classic example of convergence, but the skeletal morphological patterns associated with it are underexplored. To provide insights on the biomechanical and developmental consequences of transitions to limb reduction, we use geometric morphometrics to examine the morphology of pectoral and pelvic girdles in 90 species of limb-reduced skinks and their fully limbed relatives. Clavicle shapes converge towards an acute anterior bend when forelimbs are lost but hindlimbs are retained-a morphology typical of sand-swimmers. This may either indicate functional adaptations to locomotion in fine substrates, or a developmental consequence of complete limb loss. The shape of limb-bearing elements of both girdles (coracoid and pelvis) instead closely mirrors limb reduction, becoming more simplified as undulation replaces limbed locomotion. Integration between girdles decreases in taxa lacking elements of the forelimbs but not hindlimbs, indicating differential selection on each girdle in response to distinct locomotory strategies. However, this pattern becomes less clear when considering phylogenetic history, perhaps because it is limited to one specific clade (Lerista). We show how the functional demands of locomotion can induce changes at different levels of organismal organization, including both external and internal structures.

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来源期刊
CiteScore
7.90
自引率
4.30%
发文量
502
审稿时长
1 months
期刊介绍: Proceedings B is the Royal Society’s flagship biological research journal, accepting original articles and reviews of outstanding scientific importance and broad general interest. The main criteria for acceptance are that a study is novel, and has general significance to biologists. Articles published cover a wide range of areas within the biological sciences, many have relevance to organisms and the environments in which they live. The scope includes, but is not limited to, ecology, evolution, behavior, health and disease epidemiology, neuroscience and cognition, behavioral genetics, development, biomechanics, paleontology, comparative biology, molecular ecology and evolution, and global change biology.
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