期刊
JOURNAL OF ZOOLOGY
卷 309, 期 3, 页码 200-211出版社
WILEY
DOI: 10.1111/jzo.12714
关键词
Crocodylia; forelimb; hindlimb; presacral length; midshaft circumference; ontogeny; allometric growth; body size
类别
资金
- International Travel Grant from the Florida Museum of Natural History
- China Postdoctoral Science Foundation [2018M642511]
- JSPS Kakenhi [15J02626, 17K14411]
- NSFC [41772003, 41402015]
- Fundamental Research Funds for the Central Universities of China [PA2018GDQT0007]
- Hokkaido University Grant for Research Activities Abroad
- Hokkaido University Clark Memorial Foundation
- JSPS Oversea Challenge Program for Young Researchers
- Grants-in-Aid for Scientific Research [15J02626, 17K14411] Funding Source: KAKEN
Crocodylia is the sole extant remnant of quadrupedal archosaurs playing a pivotal role in understanding the evolution of growth allometry in the archosaur locomotor apparatus. However, among crocodylians, the postnatal growth of the postcranial skeleton has almost exclusively been examined in Alligator mississippiensis, and whether other species share the same growth pattern is unknown. Here, we tested whether the following allometric trends are conserved across Crocodylia: (1) forelimb length grows isometrically relative to hindlimb length; (2) fore- and hindlimb lengths become relatively shorter with increasing body size; and (3) long bone cross-sectional geometry becomes more robust relative to body size. We examined the relationships of limb lengths, stylopodial circumferences and presacral length (body size proxy) in extant crocodylians using reduced major axis regressions and compared the slopes among species. The result revealed non-uniform growth patterns of limb architecture among living crocodylians. Generally, the hindlimb grows with negative allometry against the forelimb in non-gavialid crocodylians, whereas two gavialids (Gavialis gangeticus and Tomistoma schlegelii) showed isometry in hind- vs. forelimb length scaling, potentially reflecting their unique locomotor ecology. Femur circumference scales negatively against humerus circumference in most of the species examined, which may be related to the anterior shift of the center of mass during growth. Stylopodial circumferences scale variously against stylopodial lengths and presacral length in crocodylians, lending little support to hypotheses that these allometries correlate with adult body size or metabolism (i.e. ectothermic or endothermic) in tetrapods.
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