Fossil pollen indicates an explosive radiation of basal Asteracean lineages and allied families during Oligocene and Miocene times in the Southern Hemisphere
Fossil pollen indicates an explosive radiation of basal Asteracean lineages and allied families during Oligocene and Miocene times in the Southern Hemisphere
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DOI：
10.1016/j.revpalbo.2010.02.004
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发表时间：
2010-05-01
影响因子：
1.9
通讯作者：
Crisci, Jorge V.
中科院分区：
文献类型：
--
作者：
Barreda, Viviana;Palazzesi, Luis;Crisci, Jorge V.
我们对菊科及其近缘科过去的分布和辐射的认识主要依赖于化石花粉记录。近年来，在非洲南部、澳大利亚、新西兰和南美洲南部（巴塔哥尼亚）有新的发现。明确分配morphotaxa从准确的沉积物年代允许第一次全面审查过去的分布最重要的核心的向日葵联盟的家庭（Menyanthaceae，Goodeniaceae，Calyceraceae和Asteraceae）。本文的主要目的是根据世界范围内的花粉化石记录，探讨菊科（Mutisioideae和Barnadesioideae）及其近缘属（Menyanthaceae、Goodeniaceae和Calyceraceae）的基底谱系的主要进化辐射。几个分类群，今天仅限于孤立的地理区域，在古近纪时期广泛分布于南半球。例如，Menyanthaceae，Goodeniaceae和Mutisioideae（菊科）在渐新世广泛分布于冈瓦纳大陆，现在其地理范围急剧减少。与此相反，新第三纪早期的记录表明，灭绝和多样化事件逐渐导致了今天的配置。从广义上讲，中新世化石分配到这个分支（Barnadesioideae，Nassauvieae和Calyceraceae）的分布与它们现在的分布一致。主要的植物区系更替与南极洲的最终隔离相吻合，导致更冷，更干燥，更季节性的气候，并迫使这些冈瓦纳元素的进化和分布。(C)2010 Elsevier B.V.保留所有权利。
Much of our knowledge of the past distribution and radiation of Asteraceae and allied families depends on the fossil pollen record. In recent years, new discoveries are coming to light from southern Africa, Australia, New Zealand, and southern South America (Patagonia). Unequivocally assigned morphotaxa from accurately dated sediments have permitted for the first time a comprehensive review of the past distribution of the most important core of the sunflower alliance of families (Menyanthaceae, Goodeniaceae, Calyceraceae and Asteraceae). The main goal of this contribution is to explore the major evolutionary radiation of the basal lineages of Asteraceae (Mutisioideae and Barnadesioideae) and allied relatives (Menyanthaceae, Goodeniaceae and Calyceraceae) on the basis of the worldwide fossil pollen records. Several taxa, which today are restricted to isolated geographic regions, were widespread in the Southern Hemisphere during Paleogene times. Menyanthaceae, Goodeniaceae and Mutisioideae (Asteraceae), for example, had a wide distribution over Gondwanan landmasses in the Oligocene and are now drastically reduced in their geographic range. Early Neogene records, in contrast, suggest extinction and diversification events that progressively led to the present day configuration. In broad terms, the distribution of Miocene fossils assigned to this clade (Barnadesioideae, Nassauvieae, and Calyceraceae) agrees with that of their present distribution. The major floristic turnovers coincided with the final isolation of Antarctica, leading to cooler, drier, and more seasonal climates and forced the evolution and distribution of these Gondwanan elements. (C) 2010 Elsevier B.V. All rights reserved.