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首页> 外文期刊>Marine biology >Production of dissolved organic carbon by Oithona nana (Copepoda: Cyclopoida) grazing on two species of dinoflagellates
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Production of dissolved organic carbon by Oithona nana (Copepoda: Cyclopoida) grazing on two species of dinoflagellates

机译：放牧对两种鞭毛藻的Oithona nana（Copepoda：Cyclopoida）生产溶解的有机碳

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摘要

Production of dissolved organic carbon (DOC) by sloppy feeding copepods may represent an important source of DOC in marine food webs. By using the C-14-labeling technique, we quantify for the first time the production of DOC by the small cyclopoid copepod Oithona nana on two species of dinoflagellates, Oxyrrhis marina and Karlodinium sp. We found significant production of DOC when O. nana grazed on O. marina, corresponding to 6-15 % of the carbon ingested. When grazing the smaller Karlodinium sp., no DOC was produced. In additional experiments, we compared O. nana feeding rates on the dinoflagellate species Prorocentrum micans, Akashiwo sanguinea, Karlodinium sp. and O. marina. Clearance rates varied with prey size, with highest and lowest clearance rates on O. marina and Karlodinium sp., respectively. Our study indicates that even though O. nana feed efficiently on dinoflagellates, some of the carbon cleared can be lost as DOC. However, the DOC production by O. nana was lower than rates reported for calanoid copepods. We hypothesize that this is a result of the ambush feeding behavior of O. nana, which is considered a more specialized feeding mode than, for instance, suspension feeding. Due to high abundances and global distribution, we suggest that Oithona can represent an important source of DOC in marine ecosystems. This would particularly be the case during autumn and winter, where they may contribute to maintaining the microbial loop activities during periods of low primary production.
机译：食的pe足类动物产生溶解性有机碳（DOC）可能代表海洋食物网中DOC的重要来源。通过使用C-14标记技术，我们首次量化了小型独眼动物co足类Oithona nana对两种鞭毛藻（Oxyrrhis marina和Karlodinium sp）的DOC产量。当O.nana在O.marina上放牧时，我们发现DOC的大量产生，相当于所摄入碳的6-15％。当放牧较小的Karlodinium sp。时，没有产生DOC。在其他实验中，我们比较了鞭毛藻物种Prorocentrum micans，Akashiwo sanguinea和Karlodinium sp。的O. nana摄食率。和O. marina。清除率随猎物大小的不同而变化，分别以O. marina和Karlodinium sp。的清除率最高和最低。我们的研究表明，即使O. nana有效地捕食鞭毛鞭毛藻，清除的一些碳也可能作为DOC损失掉。但是，O。nana的DOC产量低于类cal足类足类的报告产量。我们假设这是O. nana埋伏进食行为的结果，该行为被认为比悬浮饲料更专业。由于丰度高和分布广泛，我们建议Oithona可以代表海洋生态系统中DOC的重要来源。在秋季和冬季尤其如此，它们可能有助于在初级生产量较低的时期维持微生物循环活动。

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    《Marine biology》 |2016年第11期|237.1-237.8|共8页
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    Svensen Camilla; Vernet Maria;

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    UiT Arctic Univ Norway, Fac Biosci Fisheries & Econ, N-9037 Tromso, Norway;

    Univ Calif San Diego, Scripps Inst Oceanog, 9500 Gilman Dr, La Jolla, CA 92093 USA;

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