VERTICAL-DISTRIBUTION AND ISOTOPIC FRACTIONATION OF LIVING PLANKTONIC-FORAMINIFERA FROM THE PANAMA BASIN
VERTICAL-DISTRIBUTION AND ISOTOPIC FRACTIONATION OF LIVING PLANKTONIC-FORAMINIFERA FROM THE PANAMA BASIN
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DOI：
10.1038/298841a0
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发表时间：
1982-01-01
期刊：
影响因子：
64.8
通讯作者：
BE, AWH
中科院分区：
文献类型：
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作者：
FAIRBANKS, RG;SVERDLOVE, M;BE, AWH
利用北大西洋西部的资料，建立了一个解释浮游有孔虫垂直分布和季节分布的模式1,2，该模式由三个原则组成：(1)光区（80-100米以上）的条件完全决定了整个水体浮游有孔虫的种类组成和丰度。(2)在光带内，物种根据其温度偏好垂直分层。一些作者基于沉积物的同位素分析提出了根据温度偏好的深度分布。由于季节温度变化、海水δ 18o组成的季节变化以及物种特异性同位素分馏，仅凭沉积物分析无法提供这一假设的严格证据。(3)叶绿素最大值是主要的食物来源区，有孔虫优先利用。这里展示的巴拿马盆地的数据证实了这一模型。赤道东太平洋的巴拿马盆地有一个浅而陡峭的温跃层，对浮游有孔虫进行了取样。采用多重开闭网和环境传感系统（momoness）4采集了13组8个垂直分层倾斜样本。我们报告的定量分布和稳定同位素组成浮游有孔虫从四个MOCNESS牵引接管了5天,在1979年8月(RVKnorrcruise 73)在5°20的N, 8°50 w .每个牵引由8个样本综合∼12.5 - m 126年商务部间隔从0到100,25米间隔127年商务部从0到200,100 - 150米的间隔从0到在商务部128年和250 - 1000区间,从0到2000在131年商务部。
A model1,2, which explains the vertical and seasonal distribution of planktonic foraminifera was developed using data from the western North Atlantic and is comprised of three tenets: (1) The conditions in the photic zone (upper 80–100 m) exclusively dictate planktonic foraminifera species composition and abundance throughout the water column. (2) Species are vertically stratified within the photic zone according to their temperature preference. Depth distribution according to temperature preference has been proposed by several authors3based on isotope analyses of sediments. Due to seasonal temperature variations, seasonal variations in theδ18O composition of seawater, and species-specific isotope fractionation, rigorous proof of this hypothesis cannot be provided from sediment analyses alone. (3) The chlorophyll maximum is a major food source zone, which is preferentially exploited by foraminifera. Our data from the Panama Basin, which are presented here, are confirmation of this model. The Panama Basin in the eastern equatorial Pacific, which has a shallow and steep thermocline, was sampled for living planktonic foraminifera. A multiple opening–closing net and environmental sensing system (MOCNESS)4was used to collect 13 sets of eight vertically stratified oblique samples. We report here the quantitative distribution and stable isotopic composition of planktonic foraminifera from four MOCNESS tows taken over 5 days, during August 1979 (RVKnorrcruise 73) at 5°20′ N, 8°50′ W. Each tow consisted of eight samples which integrated ∼12.5-m intervals from 0 to 100 m for MOC 126, 25-m intervals from 0 to 200 m for MOC 127, 100–150-m intervals from 0 to 1,000 m on MOC 128 and 250-m intervals from 0 to 2,000 m on MOC 131.