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赤道西太平洋冬季浮游有孔虫分布与壳体同位素特征

, PP. 284-291

Keywords: 浮游拖网,浮游有孔虫,丰度,垂直分布,氧碳同位素,赤道西太平洋

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Abstract:

通过对2009年1月在赤道西太平洋暖池区6个站位、28个垂直分层拖网浮游有孔虫样品进行分析,在0~250m水层内共鉴定出14个浮游有孔虫属种,以热带暖水种为主、广适应性冷水种仅零星出现。表层种Globigerinoidesruber平均生活深度较Globigerinoidessacculifer深,可能是由于赤道地区强烈的太阳光照射或两个种食物来源差别的缘故。G.ruber与Pulleniatinaobliquiloculata壳体氧碳同位素协同变化,反映出海水碳酸盐化学体系是同位素变化的控制因子之一。此外,浮游有孔虫壳径也是壳体同位素值的重要影响因素,因而为了减小壳体壳径对壳体同位素值的影响,进行浮游有孔虫同位素分析时应尽量挑选壳径相近的壳体。

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