femalepreferencepromotesasynchronoussexevolutioninelephantiformes

	femalepreferencepromotesasynchronoussexevolutioninelephantiformes
	Wang Shiqi; Deng Tao
刊名	古脊椎动物学报
	2016
卷号	54 期号:1 页码:51
ISSN号	1000-3118
英文摘要	Sexually dimorphic characters are usually thought to enhance copulatory success by intraspecific competition; for example, larger body size and stronger tusks are sexually dimorphic characters in fossil and extant male proboscideans. Here, we show that some sexually dimorphic characters in fossil Elephantiformes, the largest group of proboscideans, are strongly correlated with the evolution of this group rather than direct sexual competition. In Miocene Platybelodon grangeri and Gomphotherium angustidens, males tended to initially possess evolutionarily more derived characters than females, and females then evolved similar variation. This phenomenon may have occurred as a result of female preference. During the early evolutionary stage (thriving stage) of Elephantiformes, sexual selection pressure promoted development of more prominent derived characters in males than females. However, during their late evolutionary stage (declining stage), sexual selection pressure seems to have weakened; thus, the asynchrony between the two sexes diminished. This new discovery may help explain a common mechanism of large ungulate evolution and extinction, because substantial sexual dimorphism is often displayed in thriving groups, such as Cervidae and Bovidae, in contrast to little sexual dimorphism in declining groups, such as extant taxa of Equidae, Rhinoceridae, and Giraffidae.
语种	英语
内容类型	期刊论文
源URL	[http://119.78.100.205/handle/311034/15594]
专题	中国科学院古脊椎动物与古人类研究所
作者单位	中国科学院古脊椎动物与古人类研究所
推荐引用方式 GB/T 7714	Wang Shiqi,Deng Tao. femalepreferencepromotesasynchronoussexevolutioninelephantiformes[J]. 古脊椎动物学报,2016,54(1):51.
APA	Wang Shiqi,&Deng Tao.(2016).femalepreferencepromotesasynchronoussexevolutioninelephantiformes.古脊椎动物学报,54(1),51.
MLA	Wang Shiqi,et al."femalepreferencepromotesasynchronoussexevolutioninelephantiformes".古脊椎动物学报 54.1(2016):51.