摘要
依据居群生态学的理论，采用大小－频率直方图和生存曲线，对采自滇东曲靖上志留统关底组的４种１４个腕足动物居群进行分析对比，尝试性地阐述了居群结构与沉积环境、居群形态变异与沉积环境之间的关系。
The Guandi Formation (Upper Silurian), about 664. 3m thick, composed of mudstones,sandstones,shales and thin-bedded marls,contains a large number of shelly fossilspredominatedy by brachiopods. The full brachiopod fauna includes MOlongia uniplicata(Grabau ), Atrypoidea foxi Jones, Atrypoidea phoca (Salter), Striispirifer yunnanensisRong et Yang, Howellella qujingensis (Fang), Nill'forovaena sinensis Rong et Yang andLingula sp.,which are distributed in several layers of marls and mudstones at the bottomand lower part of the formation. Fossils of one species in the same stratum are consideredas one population. A species might have several populations due to the isolation of its distributive strata by non-fossiliferous rocks in the Guandi Formation.
出处
《古生物学报》
CAS
CSCD
北大核心
1995年第6期742-754,共13页
Acta Palaeontologica Sinica
关键词
腕足动物
居群结构
关底组
晚志留世
size-frequency
survivorship curve
population structure
opportunistic species
equilibrium species
