The ciliate-copepod link in marine ecosystems
The ciliate-copepod link in marine ecosystems
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DOI：
10.3354/ame038157
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发表时间：
2005-02-09
影响因子：
1.4
通讯作者：
Saiz, E
中科院分区：
文献类型：
--
作者：
Calbet, A;Saiz, E
我们展示了对纤毛虫作为桡足类碳源的相对重要性的跨生态系统比较分析的结果，并且特别评估了纤毛虫-桡足类营养联系的强度。尽管浮游植物在全球范围内的生物量远高于纤毛虫（>1 个数量级），但纤毛虫的消耗平均占桡足类每日碳配给量的 30%（纤毛虫 + 浮游植物）。桡足类纤毛虫消耗的相对重要性显然取决于系统的营养状态。在浮游植物浓度较低的地区（分别为 500 mugC l(-1)）。从生物地球化学的角度来看，我们的碳预算估计表明，桡足类在全球范围内加工 5.5 至 8.1 十亿吨（Gt）浮游植物来源的 C yr(-1)；从异养方面来看，这一通量将代表 2.0 至 2.4 Gt 纤毛虫衍生的 C yr-1 ，如果包括其他微异养生物，如异养甲藻，可能会获得更高的值。因此，在海洋生物地球化学循环和中上层食物网模型中，绝对应该考虑纤毛虫和其他微型浮游动物向上层营养层的碳通量。
We show the results of a comparative, cross-ecosystem, analysis of the relative importance of ciliates as carbon sources for copepod, and, specifically, evaluated the strength of the ciliate-copepod trophic link. Although phytoplankton represent, globally, a far higher biomass than ciliates (>1 order of magnitude), the consumption of the latter nevertheless comprises, on average, 30% of copepod daily carbon rations (ciliates + phytoplankton). The relative importance of ciliate consumption by copepods clearly depends on the trophic state of the system. In regions where phytoplankton concentrations are low (500 mugC l(-1), respectively. From a biogeochemical point of view, our carbon budget estimates indicate that copepods process, on a global scale, 5.5 to 8.1 gigaton (Gt) phytoplankton-derived C yr(-1); from the heterotrophic side, this flux would represent 2.0 to 2.4 Gt ciliate-derived C yr-1 and, probably, a higher value would be obtained if other microheterotrophs, like heterotrophic dinoflagellates, were included. Hence, the flux of carbon from ciliates, and other microzooplankton, towards upper trophic levels should definitely be considered in oceanic biogeochemical cycles and pelagic food web models.