Evolutionary Processes in Neogene Planktonic Foraminifera atHigh Resolution and Paleoceanography

侦探他之前的研究为理解进化过程提供了许多新的数据，并重申了对新近纪晚期浮游有孔虫Globoconella群的研究具有很大潜力的信念。简而言之，有几个主要因素，结合起来，提供了机会，可以利用这个程序：1。在新近纪晚期（7 Ma至今）连续取心的沉积序列中，大量保存完好、可测量的标本为时间分辨率提供了很高的潜力，因为使用了液压活塞盖的岩心质量。2. 物种形态（生物计量学）调查表明，在所有纬度上都有明显的进化变化。3. 足够广泛的地理覆盖序列将揭示迁移和生物竞争在进化过程中的作用。4. 序列在不同的地表水团中的位置，这些地表水团被海洋锋面分隔开，作为浮游有孔虫物种的部分屏障，在过去的几百万年里，它们也作为基因流动的部分屏障。5. 从正在进行进化调查的同一地点获得的古海洋学资料的存在。这包括氧和碳同位素地层学以及浮游有孔虫组合的丰度变化。6. 一套易于识别的形态特征，现在可以使用完善的方法准确、快速地测量。

The P.I.'s previous studies have provided much new data towards an understanding of evolutionary processes and have reaffirmed the belief in the high potential of studies of the late Neogene planktonic foraminiferal Globoconella group for evolutionary insights. Briefly, there are several principal factors that, in combination, provide opportunities that may be exploited through this program: 1. Large numbers of well-preserved, measurable specimens in continuously cored sedimentary sequences of late Neogene age (7 Ma to present) offer a high potential for time resolution due to core quality resulting from use of the hydraulic piston corer. 2. Clear evolutionary changes at all latitudes shown by the species shape (biometric) investigations. 3. Sufficiently broad geographic coverage of the sequences will reveal the role of migration and biotic competition in the evolutionary process. 4. The location of sequences in distinct surface water masses separated by oceanographic fronts acting as partial barriers to planktonic foraminiferal species and which acted as partial barriers to gene flow during the last several million years. 5. The existence of paleoceanographic information from the same sites for which the evolutionary investigations are being conducted. This includes oxygen and carbon isotopic stratigraphy and abundance variations in planktonic foraminiferal assemblages. 6. A suite of easily recognized morphometric features that are now accurately and rapidly measured using the well-developed methodology.