| Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour | |
Zheng, Xiaoting1,2; O'Connor, Jingmai3; Huchzermeyer, Fritz4; Wang, Xiaoli1; Wang, Yan1; Wang, Min3; Zhou, Zhonghe3 ; [email protected]
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| 2013-03-28 | |
| 发表期刊 | NATURE
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| ISSN | 0028-0836 |
| 卷号 | 495期号:7442页码:507-511 |
| 文章类型 | Article |
| 摘要 | The two groups of archosaurs, crocodilians and birds, form an extant phylogenetic bracket for understanding the reproductive behaviour of dinosaurs. This behaviour is inferred from preserved nests and eggs, and even gravid individuals(1). Data indicate that many 'avian' traits were already present in Paraves-the clade that includes birds and their close relatives-and that the early evolution of the modern avian form of reproduction was already well on its way(2,3). Like living neornithine birds, non-avian maniraptorans had daily oviposition and asymmetrical eggs with complex shell microstructure, and were known to protect their clutches(4-6). However, like crocodilians, non-avian maniraptorans had two active oviducts (one present in living birds), relatively smaller eggs, and may not have turned their eggs in the way that living birds do(1,6). Here we report on the first discovery of fossilized mature or nearly mature ovarian follicles, revealing a previously undocumented stage in dinosaur reproduction: reproductively active females near ovulation. Preserved in a specimen of the long bony-tailed Jeholornis and two enantiornithine birds from the Early Cretaceous period lacustrine Jehol Biota in northeastern China, these discoveries indicate that basal birds only had one functional ovary, but retained primitive morphologies as a result of their lower metabolic rate relative to living birds. They also indicate that basal birds reached sexual maturity before skeletal maturity, as in crocodiles and paravian dinosaurs. Differences in follicular morphology between Jeholornis and the enantiornithines are interpreted as forming an evolutionary gradient from the reproductive condition in paravian dinosaurs towards neornithine birds. Furthermore, differences between the two enantiornithines indicate that this lineage might also have evolved advanced reproductive traits in parallel to the neornithine lineage. |
| 关键词 | Alligator-mississippiensis Dinosaur China Growth Gender Size |
| WOS标题词 | Science & Technology |
| URL | 查看原文 |
| 关键词[WOS] | ALLIGATOR-MISSISSIPPIENSIS ; DINOSAUR ; CHINA ; GROWTH ; GENDER ; SIZE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Science & Technology - Other Topics |
| WOS类目 | Multidisciplinary Sciences |
| WOS记录号 | WOS:000316682800045 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.205/handle/311034/4187 |
| 专题 | 古低等脊椎动物研究室 |
| 通讯作者 | [email protected] |
| 作者单位 | 1.Linyi Univ, Inst Geol & Paleontol, Linyi 276000, Shandong, Peoples R China 2.Tianyu Nat Hist Museum Shandong, Pingyi 273300, Shandong, Peoples R China 3.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origin, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 4.Univ Pretoria, Fac Vet Sci, Dept Paraclin Sci, ZA-0110 Onderstepoort, South Africa |
| 推荐引用方式 GB/T 7714 | Zheng, Xiaoting,O'Connor, Jingmai,Huchzermeyer, Fritz,et al. Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour[J]. NATURE,2013,495(7442):507-511. |
| APA | Zheng, Xiaoting.,O'Connor, Jingmai.,Huchzermeyer, Fritz.,Wang, Xiaoli.,Wang, Yan.,[email protected].(2013).Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour.NATURE,495(7442),507-511. |
| MLA | Zheng, Xiaoting,et al."Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour".NATURE 495.7442(2013):507-511. |
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