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首页> 外文期刊>Marine ecology progress series >Pigment transfer from phytoplankton to zooplankton with emphasis on astaxanthin production in the Baltic Sea food web
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Pigment transfer from phytoplankton to zooplankton with emphasis on astaxanthin production in the Baltic Sea food web

机译：色素从浮游植物转移到浮游动物，重点是波罗的海食物网中虾青素的产生

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The carotenoid astaxanthin is a powerful antioxidant and a compound of vital importance for many marine organisms such as crustaceans and salmonids. Although astaxanthin deficiency may have serious consequences for ecosystem functioning, its origin and transfer in the food web have been little studied. Astaxanthin is produced by planktonic crustaceans, but these cannot synthesise carotenoid pigments de novo; they rely on the availability of astaxanthin precursors through the consumption of phytoplankton algae. We performed 4 laboratory experiments to test how the production of astaxanthin in wild pelagic copepod communities (mainly consisting of Acar-tia) is affected when different phytoplankton communities (unfertilised, fertilised with N and P, or fertilised with N, P and Si) are supplied as prey. We show that phytoplankton community composition and biomass have profound effects on the production of astaxanthin in calanoid copepods. When they were grazing on a diverse phytoplankton community with high biomass dominated by chlorophytes, dinoflagellates and diatoms with thin silica frustules, astaxanthin production in the copepods was highest. It was lower when the copepods were fed with low phytoplankton biomass or high biomass dominated by large heavily silicified diatoms; these diatoms were not consumed and grazing was mainly on prymnesiophytes. When the astaxanthin production was high, maximum astaxanthin content per copepod individual of about twice the initial level was reached during sunrise. These results suggest increased feeding activity and astaxanthin production during the night and utilisation of astaxanthin for photoprotection and other antioxidant activities during the day.
机译：类胡萝卜素虾青素是一种强大的抗氧化剂，对许多海洋生物（例如甲壳类和鲑鱼类）至关重要。尽管虾青素缺乏可能对生态系统功能产生严重影响，但对其来源和在食物网中的转移的研究很少。虾青素是由浮游甲壳类动物产生的，但是它们不能从头合成类胡萝卜素色素。他们依靠浮游植物藻类的消耗来获得虾青素前体。我们进行了4个实验室实验，以测试当不同的浮游植物群落（未受精，受N和P肥或受N，P和Si肥）时，野生上层co足动物群落（主要由Acar-tia组成）中虾青素的生产如何受到影响。作为猎物提供。我们表明浮游植物群落组成和生物量对在cal足类pe足类虾青素生产中有深远的影响。当他们在多样化的浮游植物群落中放牧时，它们的高生物质以叶绿素，鞭毛藻和带有薄硅壳的硅藻为主，the足类中的虾青素产量最高。当the足类动物以低浮游植物生物量或以大量严重硅化的硅藻为主的高生物量时，lower足动物的摄食量较低；这些硅藻没有被消耗掉，放牧主要集中在褐藻类植物上。当虾青素产量高时，每个co足类个体的最大虾青素含量约为日出时初始水平的两倍。这些结果表明，夜间的摄食活性和虾青素的产生增加，白天利用虾青素进行光保护和其他抗氧化活性。

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