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Taphonomic bias in the transition from life to death assemblages of marine phytoplanktor

海洋浮游植物从生到死组合转变的埋藏学偏差

基本信息

批准号：
07640628
负责人：
TANIMURA Yoshihiro
金额：
$ 1.28万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640628/
关键词：
plankton sediment traps taphonomic bias

项目摘要

Four sets of a time-series of thirteen consecutive 27 to 28 days-long samples representing one sediment trapping interval (Mar. 5,1991-Mar. 2,1992) were collected from four deferent depths in the northwest Pacific at station JT (34ﾟ9.802'N,141ﾟ59.268'E ; 916m, 3422m, 5429m and 8430m), and provided material to evaluate information loss in the transition from life to death assemblages of diatoms. Two sediment samples also provided material to evaluate the loss on sediment-water interface. Comparison in flux records among the four sets of trap samples distinguishes one high flux period found in two different dephts as conspicuous flux peaks ; 3442m and 5429m. A sinking velocity of diatom flux is calculated from a time lag between the two peaks ; more than 71m/day. Differences in diatom assemblages among the two peaks and the underlying sediments suggest that dissolution on sediment-water interface appears to be the prime factor in determining diatom assemblages preserved in sediments, and the following three diatom groups are distinguished as most susceptible forms to value dissolution in the Kuroshio water ; Nitzschia bicapitata-bifulcata complex, Neodelphineis indica, Chaetoceros species. These forms together comprise 55% to 60% of total sediment-trap floras which suggests that information loss from water column to sediments is at least 50%.

四组时间序列，13个连续的27至28天的样本，代表一个泥沙捕获间隔(1991年3月5日-3月。在西北太平洋JT站4个不同深度(34ﾟ9.802‘N，141ﾟ59.268’E；916m，3422m，5429m和8430m)采集的)，为评价硅藻从生到死的过渡过程中的信息损失提供了材料。两个沉积物样品也为评价沉积物-水界面上的损失提供了材料。对比四组圈闭样品的通量记录，发现在两个不同深度发现的一个高通量周期是明显的通量峰：3442米和5429米。硅藻通量的下沉速度是从两个峰值之间的时间滞后计算出来的，超过71m/天。两个峰和下伏沉积物之间硅藻组合的差异表明，沉积物-水界面上的溶解似乎是决定沉积物中保存的硅藻组合的主要因素，以下三个硅藻组被区分为最容易在黑潮水中溶解的形式：Nitzschia biapitata-biulcata复合体、Neodelphineis dica、Chaetoceros种。这些形态加在一起占总沉积物捕集植物群的55%-60%，这表明从水柱到沉积物的信息损失至少有50%。