古脊椎动物学报2007，Vol.45Issue(2)：145-160,16.
中国-中新世湖泊的古生态:根据山旺盆地植硅体的初步解释
PALAEOECOLOGY OF AN EARLY-MIDDLE MIOCENE LAKE IN CHINA: PRELIMINARY INTERPRETATIONS BASED ON PHYTOLITHS FROM THE SHANWANG BASIN
Caroline A.E.STR(O)MBERG 1Else Marie FRIIS 2梁明媚 3Lars WERDELIN 2张玉亮4
作者信息
- 1. 美国史密森研究院国家自然历史博物馆古生物部,华盛顿,20560-0121
- 2. 瑞典自然历史博物馆古植物部,斯德哥尔摩,50007,104 05
- 3. 瑞典自然历史博物馆古动物部,斯德哥尔摩,50007,104 05
- 4. 英国伯明翰大学地理、地球及环境学院,伯明翰,B15 2TT
- 折叠
摘要
Abstract
The lacustrine Early to Middle Miocene Shanwang Formation contains an exceptionally well-preserved biota including insects, plants, and vertebrates that has been subject to intense study. Palaeoecological work on plant macrofossils and palynofloras indicate that the locality represents a forest under a humid, warm-temperate to subtropical climate that remained rather stable during the deposition of the formation. This interpretation is supported by fossil vertebrates such as bats and tapirs discovered in the Shanwang section. However, to date no information has been available on the presence, abundance, and taxonomic composition of grasses at this locality. Here, we report on phytoliths extracted from six samples from the Shanwang Formation, providing new evidence of the vegetation that grew around the lake. The phytolith assemblages contain well-preserved and abundant grass phytoliths, forest indicator phytoliths from dicotyledonous plants, and infrequent palm phytoliths. The grass phytoliths consist of forms produced by C3/C4 PACCAD grasses and pooids, with a minor component of morphotypes thought to derive from closed-habitat grasses. Our preliminary interpretation of these phytolith assemblages is that they reflect a lake-side wooded habitat and abundant helophytic to niesophytic grasses, with drier areas supporting pooid ( and PACCAD) grasses. The data support the reconstruction of the Miocene Shanwang region as more humid and equable than presently. The Shanwang phytolith assemblages contrast with Miocene lacustrine phytolith assemblages from Turkey and the Great Plains of North America, which indicate grass communities characterized by diverse C3 pooids and different types of PACCAD grasses. Future research will determine whether this variability reflects large-scale biogeographic differences in grass communities or local, microclimate-related variation.关键词
中国山旺/中新世/禾本科/植硅体分析/古生态Key words
Shanwang, China/Miocene/Poaceae/phytolith analysis/palaeoecology分类
生物科学引用本文复制引用
Caroline A.E.STR(O)MBERG,Else Marie FRIIS,梁明媚,Lars WERDELIN,张玉亮..中国-中新世湖泊的古生态:根据山旺盆地植硅体的初步解释[J].古脊椎动物学报,2007,45(2):145-160,16.
