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首页> 外文期刊>Marine Chemistry >Zooplankton nutrition, storage and fecal lipid composition in different water masses associated with the Agulhas and Subtropical Fronts
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Zooplankton nutrition, storage and fecal lipid composition in different water masses associated with the Agulhas and Subtropical Fronts

机译：与Agulhas和亚热带锋面有关的不同水团中浮游动物的营养，储藏和粪便脂质组成

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Fecal pellets of zooplankton can be important carriers of organic matter from surface to deep waters of the oceans. The summer cruise ANTARES 4 gave us the opportunity to collect zooplankton from the frontal subantarctic zone (station 7 or s-ant) and adjacent subtropical waters (station 8 or s-trop). Triglyceride fatty acid profiles were used to assess the trophic position of two copepods (Metridia lucens and Pleuromamma spp.), three euphausiids (Euphausia spinifera, Nematoscelis megalops, and Thysanoessa sp) and a decapod Acanthephyra sp. The euphausiid E. spinifera was studied at the two sites and its reaction to contrasting trophic environments and hydrology was highlighted by variations in its lipid composition. Most species showed various degree of omnivory: E. spinifera from subantarctic showed the highest degree of herbivory on phytoplankton (high proportion of 16:4(n-1), 18:5(n-3), 16:1(n-7)), while the same species at the subtropical station, as well as Thysanoessa sp and M. lucens from the subantarctic station displayed more omnivorous feeding characteristics, partly linked to the abundance of microzooplankton cells. Acanthephirasp, N. megalops and Pleummammasp from station 8 (s-trop) appear to be essentially carnivorous (high 18:1n-9/18:1n-7 ratio, high levels of 20:1(n-9) or 22:1(n-11)). The trophic position influenced the composition of feces, with higher PUFA percentages in fecal pellets from carnivorous species. Hence, the surface faunal assemblage and the season controlled not only the quantity but also the quality of the food supply as PUFA exported towards the benthic domain.
机译：浮游生物的粪便颗粒可以是海洋表层到深水中有机物的重要载体。夏季巡洋舰ANTARES 4给了我们一次从额南亚前锋带（站7或s-ant）和邻近的亚热带水域（站8或s-trop）收集浮游动物的机会。甘油三酸酯脂肪酸谱用于评估两个co足动物（Metridia lucens和Pleuromamma spp。），三个three虫（Euphausia spinifera，Nematoscelis megalops和Thysanoessa sp）和十足足棘藻的营养位置。在这两个地方研究了棘孢虫（Euphausiid）棘孢菌，并通过其脂质组成的变化突出了其对营养环境和水文状况的反应。大多数物种表现出不同程度的杂食性：南极亚种的棘孢菌在浮游植物上显示出最高的食草性（高比例为16：4（n-1），18：5（n-3），16：1（n-7） ）），而亚热带站的相同物种以及亚南极站的Thysanoessa sp和M. lucens则显示出更多的杂食性，部分与微浮游动物的丰富细胞有关。站8（s-trop）的棘皮动物，N。megalops和Pleummammasp似乎是肉食性的（高比例为18：1n-9 / 18：1n-7，高水平为20：1（n-9）或22：1 （n-11））。营养位置影响粪便的组成，食肉物种粪便中的PUFA含量较高。因此，随着PUFA向底栖区域的出口，地表动物的种类和季节不仅控制了食物供应的数量，而且还控制了食物供应的质量。

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