Diatom abundance from CEAMARC coretop samples 2007/08

This dataset contains the abundance of diatom species found in the surface sediments from cores collected as part of the CEAMARC (Collaborative East Antarctic Marine Census) mission. The cores were collected from the George V basin along the Antarctic coast. Latitude, longitude and water depth data are included for each site. Sediments were prepared following standard diatom preparation techniques (Rathburn et al 1997). The purpose of the data set is to catalogue the distribution of diatoms within surface sediments along the Antarctic coast. The site codes are the names given to the individual sites by the CEAMARC mission. See other CEAMARC records for more information (particularly the "Events" metadata record). Tab 1 "Raw data" are the counts of the number of individuals of any given species found at each site, and also includes the absolute abundance data for diatom valves (not counting Chaetoceros resting spores) presented in valves per gram dry weight of sediment. Tab 2 "Percent format" is the same data, but converted to a percent relative abundance for each species. Tab 3 contains the location information.

本数据集收录了CEAMARC（Collaborative East Antarctic Marine Census，南极东海洋联合普查）项目所采集岩芯的表层沉积物中硅藻物种的丰度数据。所有岩芯采自南极沿岸的乔治五世海盆。每个采样位点均附带纬度、经度与水深参数。沉积物样品的制备遵循标准硅藻样品制备流程（Rathburn等，1997）。本数据集旨在编制南极沿岸表层沉积物中的硅藻分布名录。采样位点代码为CEAMARC项目为各独立采样位点所赋予的名称。如需获取更多相关信息，请查阅其他CEAMARC相关记录（尤其是‘Events’元数据记录）。表格1‘原始数据’记录了各采样位点处各硅藻物种的个体计数结果，同时包含硅藻壳瓣（不包含角毛藻休眠孢子）的绝对丰度数据，单位为壳瓣数/克沉积物干重。表格2‘百分比格式’收录了与表格1完全一致的数据集，但将各物种的丰度转换为相对百分比丰度。表格3包含所有采样位点的位置信息。