Evolutionary consequences of the latest Paleocene thermal maximum for tropical planktonic foraminifera
Evolutionary consequences of the latest Paleocene thermal maximum for tropical planktonic foraminifera
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DOI：
10.1016/s0031-0182(98)00017-0
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发表时间：
1998-08-01
影响因子：
3
通讯作者：
Zachos, JC
中科院分区：
文献类型：
--
作者：
Kelly, DC;Bralower, TJ;Zachos, JC
对赤道太平洋中部(ODP865站)保存的浮游有孔虫组合的研究表明，在最近的古新世最热盛期(LPTM)，居住在近地表混合层的属种类多样化。这种短暂的变化导致了一套仅限于LPTM间期的短暂(50至几百ka)、独特的形态类型(AlisononMorosvella sp.，nov.，M.africana和Acarinina sibai yaensis)。平行的形态计量学和稳定的同位素数据已经被记录在维拉斯科支原体/大蒜支原体和西白杨支原体谱系的个体贝壳中。单样品同位素数据证实，大蒜和西白杨在地层上确实受LPTM碳同位素漂移的限制；所有样品都记录到异常低的(13)C值。来自三角洲(13)C漂移区间内的单样本同位素数据的地层序列被用来重建复杂的种群动力学，这些动力学调节了快速(
Study of planktonic foraminiferal assemblages preserved in the central, equatorial Pacific (ODP Site 865) reveal that genera which inhabited the near-surface, mixed layer diversified during the latest Paleocene thermal maximum (LPTM). This transient diversification gave rise to a suite of short-lived (50 to several 100 ka), distinctive morphotypes (Morozovella allisonensis sp, nov., M. africana, and Acarinina sibaiyaensis) that are restricted to the LPTM interval. Parallel morphometric and stable isotopic data have been recorded from individual shells of members of the M. velascoensis/M. allisonensis and A. soldadoensis/A. sibaiynensis lineages. The single-specimen isotope data confirm that M. allisonensis and A. sibaiynensis are indeed stratigraphically restricted to the LPTM carbon isotope excursion; all specimens recorded anomalously low delta(13)C values. A stratigraphic succession of single-specimen isotope data from within the delta(13)C excursion interval was used to reconstruct the complex population dynamics which mediated the rapid (