[1].Endocast Morphological Variation and Its Driving Forces in Scutiger boulengeri[J].Asian Herpetological Research,2022,13(4):269-283.[doi:10.16373/j.cnki.ahr.220005]
 Yinmeng HOU,Xiaoxiao SHU,Shengchao SHI,et al.Endocast Morphological Variation and Its Driving Forces in Scutiger boulengeri[J].Asian Herpetological Research(AHR),2022,13(4):269-283.[doi:10.16373/j.cnki.ahr.220005]
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Endocast Morphological Variation and Its Driving Forces in Scutiger boulengeri()
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Asian Herpetological Research[ISSN:2095-0357/CN:51-1735/Q]

卷:
13
期数:
2022年4期
页码:
269-283
栏目:
出版日期:
2022-12-20

文章信息/Info

Title:
Endocast Morphological Variation and Its Driving Forces in Scutiger boulengeri
文章编号:
AHR-2022-0005
Author(s):
Yinmeng HOU123 Xiaoxiao SHU123 Shengchao SHI123 Xiuqin LIN13 Luyao XIAO13 Jianping JIANG134 Jianghong RAN2 and Feng XIE13*
1 CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
2 College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, China
3 University of the Chinese Academy of Sciences, Beijing 100049, China
4 Mangkang Biodiversity and Ecological Station, Tibet Ecological Safety Monitor Network, Changdu 854500, Tibet, China
Keywords:
aquatic preference cranial endocast ecological adaptation phylogenetic history shape variation
DOI:
10.16373/j.cnki.ahr.220005
Abstract:
Cranial endocasts can be used as a reliable proxy for brain size, reflecting the evolutionary and environmental selection pressure of species. Although studies on endocasts in amphibians have increased in recent years, those performed on endocasts of Anura are comparatively rare, especially at the intraspecific level. Here, using a high-altitude endemic toad—Scutiger boulengeri—as a model, through the application of integrative methods (morphology, anatomy, phylogeny, and ecology), we studied intraspecific variations in endocast morphology and explored its driving forces. Three-dimensional reconstruction and the brain-to-endocranial cavity (BEC) index suggested that the endocast of S. boulengeri can reflect brain morphology to a large extent. Elliptic Fourier analysis and principal component analysis revealed great variability in the cranial endocast morphology among individuals, as well as the variation concentrated in the regions of telencephalon and optic tectum. In the species, individuals with large bodies are accompanied by a larger endocast size; the relative endocast sizes have significant clade differences but no sexual dimorphism. Additionally, the relative endocast sizes of S. boulengeri were not associated with phylogenetic history and aquatic preference but were positively correlated with altitude and negatively correlated with oxygen content, temperature, and precipitation factors (annual mean temperature, temperature seasonality, annual precipitation, and precipitation seasonality). These findings suggested that high-altitude and extreme environmental conditions acted as important selective forces in morphological variation of the cranial endocast of S. boulengeri.

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更新日期/Last Update: 2022-12-25