Ulnar dimensions and fossoriality in armadillos
Ulnar dimensions and fossoriality in armadillos
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犰狳的尺骨尺寸和化石
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
G. V. Mazzetta
中科院分区：
文献类型：
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作者：
S. Vizcaino;R. Fariña;G. V. Mazzetta
对14种犰狳（Xenarthra: dasy足科）的尺部尺寸进行了测量。建立了鹰嘴突长度与尺骨剩余长度之间的隐骨能力指数（IFA）。为了比较起见，对其他14种哺乳动物进行了同样的测量，这些哺乳动物大多来自南美洲，属于3目11科。这些哺乳动物的穴居习性可分为3类：(1)以穴居和非穴居为主；(2)经常挖洞的物种，但对这些物种来说，挖洞在它们的饮食策略中不起重要作用，它们不是穴居动物；(3)穴居物种。利用对数变换数据的单向方差分析，比较了所研究哺乳动物目的IFA均值。通过对数变换数据的拟合（最小二乘和几何平均）线性回归来评估尺骨尺寸和体重之间的二元尺寸异速。结果表明，蚁群分类是根据蚁群在目内的穴居习性来区分物种的，但对于不同目之间的穴居物种的区分却不是同样有效。在犰狳中，尺骨尺寸和体重之间的关系是等距的。最后，IFA与体型无关。
Ulnar dimensions were measured in 14 species of armadillos (Xenarthra: Dasypodidae). An index of fossorial ability (IFA) was constructed, relating the length of the olecranon process to the remaining length of the ulna. For comparative purposes, the same measurements were taken in 14 other species of mostly South American mammals belonging to 3 orders and 11 families. The fossorial habits of these mammals were classified into 3 categories: (1) species mostly cursorial and non-digging; (2) species that often dig, but to which digging plays no essential part in their alimentary strategy and are not burrowers; and (3) species that are burrowers. IFA means of the studied mammal orders were compared using one-way analysis of variance on log-transformed data. Bivariate size allometry between ulnar dimensions and body mass was assessed by fitting (least squares and geometric mean) linear regressions of log-transformed data. It is concluded that the IFA discriminates among the species according to their fossorial habits within orders, but it is not equally useful in distinguishing fossorial species between orders. In armadillos, the relationships between ulnar dimensions and body mass are isometrical. Finally, the IFA is independent of body size.