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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The relative importance of sloppy feeding, excretion, and fecal pellet leaching in the release of dissolved carbon and nitrogen by Acartia tonsa copepods
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The relative importance of sloppy feeding, excretion, and fecal pellet leaching in the release of dissolved carbon and nitrogen by Acartia tonsa copepods

机译：A螨，pe足动物pe粪，排泄和粪便颗粒浸出释放溶解的碳和氮的相对重要性

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摘要

Crustacean zooplankton produce dissolved organic matter (DOM) and inorganic nutrients via sloppy feeding, excretion, and fecal pellet leaching. These different mechanisms of the release of metabolic products, however, have never been individually isolated. Our study was designed to determine the relative importance of these different modes on release of dissolved organic carbon (DOC), ammonium (NH_4~+), and urea from Acartia tonsa calanoid copepods feeding on the diatom Thalassiosira weissflogii. Excretion and sloppy feeding were the dominant modes of DOC production (80 and 20% of total DOC release, respectively) and NH_4~+ release (93 and 7% of total NH_4~+ release, respectively). Urea, however, was predominately produced via sloppy feeding and fecal pellet leaching (25% and 62% of total urea release, respectively). Urea contributed 20% of total measured nitrogen (TMN; NH_4~++ urea) released from copepods, and constituted 100% of TMN released via fecal pellet leaching, 47% of TMN released via sloppy feeding, and only 3.5% of TMN released via excretion. TMN release was >100% of copepod body Nd~(-1) resulting in low DOC;TMN release ratios (4.1 for sloppy feeding, 2.1 for cumulative release of sloppy feeding, excretion, and fecal pellet leaching). Our results suggest that the mechanism of release plays an important role in the amount of different forms of DOM, NH_4~+, and urea available to bacteria and phytoplankton.
机译：甲壳类动物的浮游生物通过马虎喂食，排泄和粪便颗粒浸出产生溶解的有机物（DOM）和无机营养。然而，从未单独分离出这些代谢产物释放的不同机制。我们的研究旨在确定这些不同模式对以硅藻Thalasiosira weissflogii为食的A螨的an足类co足类动物释放溶解有机碳（DOC），铵（NH_4〜+）和尿素的相对重要性。排泄和粪便喂养是DOC产生的主要方式（分别占总DOC释放的80％和20％）和NH_4〜+释放（分别占NH_4〜+释放的93％和7％）。然而，尿素主要是通过马虎喂食和粪便颗粒浸出而产生的（分别占尿素总释放量的25％和62％）。尿素占co足类动物释放的总测得氮（TMN; NH_4〜++尿素）的20％，占粪便颗粒浸出释放的TMN的100％，via草喂养释放的TMN的47％，以及粪尿中释放的TMN的3.5％排泄。 TMN释放量大于pe足动物体内Nd〜（-1）的100％，从而导致DOC; TMN释放率低（lop饲料为4.1，cumulative饲料，排泄物和粪便颗粒浸出的累积释放为2.1）。我们的结果表明，释放机制在细菌和浮游植物可利用的不同形式的DOM，NH_4〜+和尿素的数量中起着重要作用。

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