一个三维的几何形态分析的Caiman下的形态变化在化后的本体发生过程中
María Victoria Fernandez Blanco1,2, Guillermo Hernán Cassini2,3,4, Paula Bona1,2
1División Paleontología Vertebrados, Museo de La Plata, Unidades de Investigación Anexo II Museo, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
PeerJ
|July 17, 2023
概括
鱼下的形状在生长过程中发生变化,受到从无脊椎动物到脊椎动物的饮食转变的影响. 成人鱼更大,更坚固,与息地和食机制相关的物种特异性差异.
科学领域:
- 进化生物学 进化生物学
- 比较解剖学的比较解剖学
- 古生物学的古生物学
背景情况:
- 鱼下本体生理及其与饮食的关系尚不清楚.
- 凯曼物种内部和间的形态变异需要进一步研究.
研究的目的:
- 分析两种鱼 (Caiman yacare和Caiman latirostris) 的下的形状变化.
- 为了研究下形状转变和在本体发生过程中的饮食转变之间的相关性.
- 探索下形态的跨物种差异及其生态影响.
主要方法:
- 在下系列上使用地标和半地标的三维几何形态方法.
- 利用主要成分分析 (PCA),回归和部分最小方形 (PLS) 分析来确定形状和饮食的相关性.
- 检查了48个*C.yacare*和15个*C.latirostris*的标本.
主要成果:
- 沿PC1分离的物种,其中*C. yacare*表现出的下,而*C. latirostris*表现出强壮的下.
- PC2和回归分析显示了本体遗传的形状变化,成人下比青少年更高,更宽,特别是在*C. latirostris*.
- PLS分析证实了下形状和饮食之间的显著关系,形态变化与养肌肉和本体遗传饮食变化有关.
结论:
- 凯曼的本质性下形状变化反映了适应从无脊椎动物转向脊椎动物的饮食转变,需要特定的机械性能来食.
- 两之间的特异性差异与遗传性饮食变化,养机制和息地偏好有关,强壮的下巴适合各种环境,细的下巴适合水生息地.
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