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Organic matter partitioning and stoichiometry in response to rising water temperature and copepod grazing

机译：响应水温升高和co足类动物放牧，有机物分配和化学计量

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Rising ocean temperature is expected to change the balance between production and degradation of organic matter due to different temperature sensitivities of auto-and heterotrophic processes. Copepods are the most prominent zooplankton group, and elevated temperature increases their growth and grazing rates. So far, it is unknown to what extent copepods affect the partitioning and stoichiometry of organic matter in a warmer surface ocean. We therefore conducted a mesocosm experiment with 3 copepod densities and 2 temperature scenarios to determine effects on the pools of dissolved and particulate organic matter and their C:N:P ratios. Here we show that particulate organic C (POC) concentrations decreased with increasing copepod abundance. This effect was more pronounced at elevated temperature, yielding a decrease in the POC to particulate nitrogen ratio (POC:PN) from 26 to 13 and in the POC: particulate organic phosphorus (POP) ratio from 567 to 257, from low to high copepod density. Dissolved organic carbon (DOC) accumulation was positively affected by temperature. However, increasing copepod abundance decreased the accumulation of DOC at elevated temperature. Copepod grazing and egestion enhanced the recycling of N and P, thereby increasing the availability of these nutrients for autotrophs. In concert with temperature-induced shifts in the phytoplankton community composition and size, changes in copepod abundance may therefore have contributed to altering the elemental composition of seston. Our findings suggest combined effects of zooplankton grazing and temperature on the composition and recycling of organic matter that should be taken into account when simulating biogeochemical cycles in a future ocean.
机译：由于自生和异养过程对温度的敏感性不同，海洋温度的上升有望改变有机物生产与降解之间的平衡。 pe足类是最突出的浮游动物群，温度升高会增加它们的生长和放牧率。迄今为止，尚不知道co足类动物在多大程度上影响了较温暖的表层海洋中有机物的分配和化学计量。因此，我们用3种co足类动物的密度和2种温度情景进行了介观试验，以确定对溶解性和颗粒性有机物池及其C：N：P比率的影响。在这里我们表明，随着co足类的丰度增加，有机碳（POC）的浓度降低。这种影响在高温下更为明显，POC与颗粒氮的比率（POC：PN）从26降低到13，POC：颗粒有机磷（POP）的比率从567降低到较高的pe足类动物密度。温度对溶解有机碳（DOC）的积累有积极影响。但是，co足类的丰度增加会降低高温下DOC的积累。 pe足类的放牧和放牧促进了氮和磷的循环利用，从而增加了这些营养素对自养生物的利用。与温度引起的浮游植物群落组成和大小的变化相一致，co足类的丰度变化可能因此导致了芝麻素元素组成的改变。我们的发现表明，在模拟未来海洋中的生物地球化学循环时，应考虑浮游动物放牧和温度对有机物组成和再循环的综合影响。

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