NONPHOSPHORUS LIPIDS IN PERIPHYTON REFLECT AVAILABLE NUTRIENTS IN THE FLORIDA EVERGLADES, USA
NONPHOSPHORUS LIPIDS IN PERIPHYTON REFLECT AVAILABLE NUTRIENTS IN THE FLORIDA EVERGLADES, USA
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DOI：
10.1111/j.1529-8817.2012.01125.x
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发表时间：
2012-04-01
影响因子：
2.9
通讯作者：
Van Mooy, Benjamin A. S.
中科院分区：
文献类型：
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作者：
Bellinger, Brent J.;Van Mooy, Benjamin A. S.
藻类和植物产生非磷脂质代替磷脂是对低磷（P）可用性的生理反应。这种反应已经在养殖和海洋浮游生物研究中得到证实，但淡水藻类的例子仍然很少。在此，我们分析了整个佛罗里达大沼泽生态系统中附着生物群落的营养成分和脂质组成。我们假设，在磷酸盐贫乏的地区，在高和低硫酸盐沃茨的附着生物将不同的比例sulfolipids（SL）和甜菜碱脂质（BL），分别。在富磷区，附着生物会产生更多的磷脂（PL）。我们观察到，在低磷网站，PL是一个次要的脂质成分。在蓝藻为主的附着生物硫酸盐丰富，BL只是略多于SL丰富。然而，在低磷，低硫酸盐地区，周丛生物包括在更大程度上的绿色藻类和硅藻，和BL代表了大部分的总脂质。即使在一个P-丰富的地区，PLs是一个小组成部分的浮游生物脂质配置文件。尽管大沼泽地的磷限制，附着生物可以发展巨大的生物量。我们的研究结果表明，在贫营养条件下，附着生物的生理反应，附着生物增加非磷脂质的丰度，并减少比例的PL。
Algal and plant production of nonphosphorus lipids in place of phospholipids is a physiological response to low phosphorus (P) availability. This response has been shown in culture and in marine plankton studies, but examples from freshwater algae remain minimal. Herein, we analyzed the nutrient contents and lipid composition of periphyton communities across the Florida Everglades ecosystem. We hypothesized that in phosphate-poor areas, periphyton in high- and low-sulfate waters would vary the proportion of sulfolipids (SLs) and betaine lipids (BLs), respectively. In phosphate-enriched areas, periphyton would produce more phospholipids (PLs). We observed that at low-P sites, PLs were a minor lipid component. In cyanobacteria-dominated periphyton where sulfate was abundant, BLs were only slightly more abundant than SLs. However, in the low-P, low-sulfate area, periphyton were comprised to a greater degree green algae and diatoms, and BLs represented the majority of the total lipids. Even in a P-rich area, PLs were a small component of periphyton lipid profiles. Despite the phosphorus limitations of the Everglades, periphyton can develop tremendous biomass. Our results suggest a physiological response by periphyton to oligotrophic conditions whereby periphyton increase abundances of nonphosphorus lipids and have reduced proportions of PLs.