DOI: 10.1016/j.palaeo.2014.10.027
论文题名: Spore diversity trends in the Middle Devonian of the Chaco-Salteño Plain, northwestern Argentina
作者: Noetinger S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417 起始页码: 151
结束页码: 163
语种: 英语
英文关键词: Argentina
; Diversity trends
; Middle devonian
; Palynostratigraphy
; Tonono formation
英文摘要: Devonian deposits in northwestern Argentina were historically studied with stratigraphical purposes, since these layers conform the source rocks of the producing basins of the region. A fairly well preserved palynomorph assemblage, from the Tonono Formation, provides an opportunity to perform the first quantitative analysis to study the evolution of diversity in the succession. Two associations are here defined by both, stratigraphic distribution of species and cluster analysis, ranging from the lower Eifelian to the lower Givetian. Rarefaction analysis reveals the existence of a relatively rich miospore population. Species richness increases while there is a drop in diversity and evenness towards the top of the column. The increment of the marine components towards the latter section indicates shifts in the shoreline. The influx of warmer water into higher latitudes, as highlighted by the arrival of the brachiopod Tropidoleptus, could have favored the inception of new spore species in the settled community. These results add to evidence that some groups build up the number of species in disturbed settings, and evenness is reduced with each new species introduced. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69137
Appears in Collections: 过去全球变化的重建
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作者单位: Museo Argentino de Ciencias Naturales Bernardino Rivadavia-CONICET, Angel Gallardo 470, Ciudad A. de Buenos Aires, Argentina
Recommended Citation:
Noetinger S.. Spore diversity trends in the Middle Devonian of the Chaco-Salteño Plain, northwestern Argentina[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417