Phytoplankton driven distribution of dissolved and particulate lipids in a semi-enclosed temperate sea (Mediterranean): Spring to summer situation
Phytoplankton driven distribution of dissolved and particulate lipids in a semi-enclosed temperate sea (Mediterranean): Spring to summer situation
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DOI：
10.1016/j.ecss.2011.04.017
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发表时间：
2011-07-20
影响因子：
2.8
通讯作者：
Kozarac, Zlatica
中科院分区：
文献类型：
--
作者：
Frka, Sanja;Gasparovic, Blazenka;Kozarac, Zlatica
2008年春夏期间，在两个具有不同营养水平的站点（即西部中营养区和东部寡营养区）对亚得里亚海北部脂质类别变化与浮游植物组成和丰度之间的关系进行了研究。浮游植物群落的变化取决于表面养分的暂时消耗和底部积累；也就是说，微型浮游植物，主要是硅藻拟菱形藻，在春季在中营养区域营养较丰富的表层发育，在夏末在贫营养区域的较深层发育。在其他时期，微型浮游植物占主导地位。两个站的溶解有机碳（DOC）和脂质含量相当，而中营养侧的颗粒有机碳（POC）更丰富。溶解部分和颗粒部分中的总脂质浓度分别在8.0至92.2μgl(-1)和16.9至76.9μgl(-1)范围内变化。 DOC和POC含量分别为0.77～1.58 mg·l(-1)和0.06～0.56 mg·l(-1)。脂质和有机碳的分布并不遵循浮游植物的进展，表明在整个调查期间有机物的产生和分解之间存在脱钩。脂质的主要来源是海洋浮游植物和细菌。低营养条件导致脂质生物合成增加。此外，寡营养的增加导致浮游植物类群数量的增加。发达类群的糖脂合成和积累在养分耗尽期间得到增强，在夏末的颗粒部分中，平均在中营养站和贫营养站分别贡献了 20.2% 和 22.0%。细菌脂质和脂质分解产物的分布表明细菌脂质降解在春季显着，而脂质非生物降解很可能发生在夏季。 (C) 2011 Elsevier Ltd. 保留所有权利。
The relationship between changes in lipid classes and phytoplankton composition and abundance in the northern Adriatic was studied during spring and summer 2008 at two stations with different nutrient levels, i.e. at the western mesotrophic and eastern oligotrophic areas. Changes in the phytoplankton community depended on temporal surface nutrient depletion and bottom accumulation; that is, microphytoplankton, mainly diatoms Pseudo-nitzschia sp., developed at nutrient richer surface layers of the mesotrophic area in spring and at deeper layers of the oligotrophic site in late summer. In other periods nanophytoplankton dominated. Dissolved organic carbon (DOC) and lipid content were comparable for the two stations, while particulate organic carbon (POC) was richer at the mesotrophic side. Total lipid concentrations varied in the range from 8.0 to 92.2 mu g l(-1) and from 16.9 to 76.9 mu g l(-1) in the dissolved and particulate fractions, respectively. DOC and POC contents were in the ranges from 0.77 to 1.58 mg l(-1) and from 0.06 to 0.56 mg l(-1), respectively. Lipid and organic carbon distribution did not follow phytoplankton progression, indicating decoupling between organic matter production and decomposition throughout the investigation period. The main sources of lipids were marine phytoplankton and bacteria. Low nutrient conditions caused increased biosynthesis of lipids. Also, increasing oligotrophy led to an increasing number of phytoplankton taxa. The synthesis and accumulation of glycolipids by the developed taxa were enhanced during nutrient exhaustion, contributing in late summer, on average, 20.2 and 22.0% at the mesotrophic and oligotrophic stations, respectively, in the particulate fraction. The distribution of bacterial lipids and lipid breakdown products implies that bacterial lipid degradation was significant in spring, while very probably lipid abiotic degradation took place during summer. (C) 2011 Elsevier Ltd. All rights reserved.