Relative tooth size at birth in primates: Life history correlates.
Relative tooth size at birth in primates: Life history correlates.
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灵长类动物出生时的相对牙齿大小：生活史相关。
DOI：
10.1002/ajpa.23302
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发表时间：
2017
影响因子：
2.8
通讯作者：
DeLeon,ValerieB
中科院分区：
文献类型：
--
作者：
Smith,TimothyD;Muchlinski,MagdalenaN;Bucher,WadeR;Vinyard,ChristopherJ;Bonar,ChristopherJ;Evans,Sian;Williams,LawrenceE;DeLeon,ValerieB
牙萌出时间表与生活史变量密切相关。在这里，我们研究了一个样本的50个围产期灵长类动物（28种），以确定是否生活史特征与相对牙齿大小在birth.Materials和MethodsNewborn灵长类动物进行了研究，使用系列组织切片。乳牙前磨牙（dp 2-dp 4），替换牙（如果有的话），和恒磨牙（M1-2/3）的上颌测量和残差从颅长计算与最小二乘回归，以获得相对的牙齿体积（RDVs.ResultsRelative dental volumes of d乳牙或恒牙有一个不明确的关系，相对新生儿的质量在所有灵长类动物。相对腭长（RPL），作为一个代理面中部的大小，是显着的，正相关较大的乳牙和恒牙后犬齿。然而，当单独检查链球菌时，较大的RPL与较小的恒牙RDV相关。在全样本中，乳前磨牙的RDV与相对妊娠长度（RGL）呈显著负相关，但与相对断奶年龄无明显关系。磨牙的RDV与RGL缺乏明确的关系;较晚的断奶与较大的磨牙RDV相关，尽管相关性不显著。当strepsirrhines单独进行分析，更清晰的趋势是存在的：较长的妊娠期或较晚的断奶与较小的乳牙和较大的永久postcanine牙齿（只有妊娠期长度的相关性是显着的）。DiscussionOur结果表明一个广泛的趋势，灵长类动物与最短的RGLs早熟乳牙;在strepsirrhines，相反的趋势是看到恒牙。类人猿会延迟恒牙的生长，而具有短RGL的链球菌会同时生长替换牙齿。新生儿的体积与现有的信息的牙尖矿化程度的比较表明，牙胚的生长和牙尖矿化可以独立选择。
ObjectivesDental eruption schedules have been closely linked to life history variables. Here we examine a sample of 50 perinatal primates (28 species) to determine whether life history traits correlate with relative tooth size at birth.Materials and methodsNewborn primates were studied using serial histological sectioning. Volumes of deciduous premolars (dp2–dp4), replacement teeth (if any), and permanent molars (M1–2/3) of the upper jaw were measured and residuals from cranial length were calculated with least squares regressions to obtain relative dental volumes (RDVs).ResultsRelative dental volumes of deciduous or permanent teeth have an unclear relationship with relative neonatal mass in all primates. Relative palatal length (RPL), used as a proxy for midfacial size, is significantly, positively correlated with larger deciduous and permanent postcanine teeth. However, when strepsirrhines alone are examined, larger RPL is correlated withsmallerRDV of permanent teeth. In the full sample, RDVs of deciduous premolars are significantly negatively correlated with relative gestation length (RGL), but have no clear relationship with relative weaning age. RDVs of molars lack a clear relationship with RGL; later weaning is associated with larger molar RDV, although correlations are not significant. When strepsirrhines alone are analyzed, clearer trends are present: longer gestations or later weaning are associated with smaller deciduous and larger permanent postcanine teeth (only gestational length correlations are significant).DiscussionOur results indicate a broad trend that primates with the shortest RGLs precociously develop deciduous teeth; in strepsirrhines, the opposite trend is seen for permanent molars. Anthropoids delay growth of permanent teeth, while strepsirrhines with short RGLs are growing replacement teeth concurrently. A comparison of neonatal volumes with existing information on extent of cusp mineralization indicates that growth of tooth germs and cusp mineralization may be selected for independently.
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影响因子：
3.2
作者：
C. Vinyard;Jandy B. Hanna
通讯作者：
Jandy B. Hanna
DOI：
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发表时间：
2003
期刊：
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作者：
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通讯作者：
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DOI：
--
发表时间：
2009
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影响因子：
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作者：
S. Zuckerman
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S. Zuckerman
胎儿变成男人
DOI：
--
发表时间：
1978
期刊：
影响因子：
--
作者：
J. Alexander;J. Tanner
通讯作者：
J. Tanner