The trophic habits of early birds

doi:10.1016/j.palaeo.2018.03.006

	The trophic habits of early birds
	O'Connor, Jingmai K.1,2
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2019
卷号	513 页码:178-195
关键词	Ayes Mesozoic Alimentary canal Teeth Stomach contents Gastroliths
ISSN号	0031-0182
DOI	10.1016/j.palaeo.2018.03.006
通讯作者	O'Connor, Jingmai K.(jingmai@ivpp.ac.cn)
英文摘要	Although direct associations that reveal diet are extremely rare in the fossil record, the rich Lower Cretaceous Jehol Lagerstatte has produced dozens of specimens preserving ingested items, which together reveal important information regarding the early evolution of the avian alimentary canal. Direct evidence indicates Jeholornis and Sapeornis ate seeds and like living granivores utilized a gastric mill although only the more derived Sapeornis possessed a crop for food storage. Despite their smaller numbers in the Early Cretaceous, most direct evidence pertains to the Omithuromorpha, indicating a structurally and functionally modern alimentary canal was present in even the earliest members of this Glade. Similar evidence is altogether lacking in the Enantiornithes suggesting this Glade was characterized by a primitive alimentary canal, potentially factoring into the ultimate extinction of this successful Cretaceous lineage. The role of the gizzard in the loss of teeth in Ayes is more complex than in non-avian theropod lineages. As in neornithines, the presence of gastroliths in basal ornithuromorphs may not be entirely indicative of herbivory although this diet does appear to correlate with complete tooth loss in this Glade. Positive selection for specialized tooth morphologies persists throughout the evolution of Ayes and in the Ornithuromorpha appears to be linked to piscivory. Although represented by the greatest numbers, no direct indicator of diet preference is preserved in any confuciusornithiform or enantiornithine suggesting these clades utilized different nutritional strategies. The absence of teeth and gastroliths in all confuciusornithiforms suggest this lineage may have secondarily switched to a non-herbivorous, soft diet. Similarly, the absence of gizzard stones in enantiomithines also suggests a soft diet while their small body size suggests Early Cretaceous species would have fed on invertebrates. The diversity of recognized dental patterns including enamel specializations observed in Jehol enantiomithines suggests effective resource partitioning of available invertebrate faunas and that teeth had an active participation in enantiornithine feeding strategies.
资助项目	National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[91514302] ; IVPP[KN214404]
WOS关键词	EARLY CRETACEOUS BIRD ; AVES ORNITHOTHORACES ; THEROPOD DINOSAUR ; ORNITHURINE BIRD ; YIXIAN FORMATION ; EARLY EVOLUTION ; CHINA ; ENANTIORNITHINE ; ARCHAEOPTERYX ; INFORMATION
WOS研究方向	Physical Geography ; Geology ; Paleontology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000454964700014
资助机构	National Natural Science Foundation of China ; IVPP
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/9233]
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	O'Connor, Jingmai K.
作者单位	1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 10010, Peoples R China 2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 10010, Peoples R China
推荐引用方式 GB/T 7714	O'Connor, Jingmai K.. The trophic habits of early birds[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2019,513:178-195.
APA	O'Connor, Jingmai K..(2019).The trophic habits of early birds.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,513,178-195.
MLA	O'Connor, Jingmai K.."The trophic habits of early birds".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 513(2019):178-195.