Kelps may compensate for low nitrate availability by using regenerated forms of nitrogen, including urea and ammonium

IF 2.8 3区 生物学 Q1 MARINE & FRESHWATER BIOLOGY Journal of Phycology Pub Date : 2024-05-04 DOI:10.1111/jpy.13459
Lauren E. Lees, Sydney N. Z. Jordan, Matthew E. S. Bracken
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Abstract

Nitrate, the form of nitrogen often associated with kelp growth, is typically low in summer during periods of high macroalgal growth. More ephemeral, regenerated forms of nitrogen, such as ammonium and urea, are much less studied as sources of nitrogen for kelps, despite the relatively high concentrations of regenerated nitrogen found in the Southern California Bight, where kelps are common. To assess how nitrogen uptake by kelps varies by species and nitrogen form in southern California, USA, we measured uptake rates of nitrate, ammonium, and urea by Macrocystis pyrifera and Eisenia arborea individuals from four regions characterized by differences in nitrogen availability—Orange County, San Pedro, eastern Santa Catalina Island, and western Santa Catalina Island—during the summers of 2021 and 2022. Seawater samples collected at each location showed that overall nitrogen availability was low, but ammonium and urea were often more abundant than nitrate. We also quantified the internal %nitrogen of each kelp blade collected, which was positively associated with ambient environmental nitrogen concentrations at the time of collection. We observed that both kelp species readily took up nitrate, ammonium, and urea, with M. pyrifera taking up nitrate and ammonium more efficiently than E. arborea. Urea uptake efficiency for both species increased as internal percent nitrogen decreased. Our results indicate that lesser-studied, more ephemeral forms of nitrogen can readily be taken up by these kelps, with possible upregulation of urea uptake as nitrogen availability declines.

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海带可利用尿素和铵等再生形式的氮来弥补硝酸盐供应不足的问题。
通常与海带生长有关的氮形式--硝酸盐,在夏季大型藻类大量生长期间通常含量较低。尽管在海带常见的南加州海湾(Southern California Bight)发现了相对较高浓度的再生氮,但作为海带氮源的铵和尿素等更短暂的再生氮形式的研究要少得多。为了评估美国南加州海带对氮的吸收如何因物种和氮的形式而异,我们在 2021 年和 2022 年的夏天测量了来自四个地区的海带个体对硝酸盐、铵和尿素的吸收率,这四个地区的特点是氮的可用性存在差异--橙县、圣佩德罗、圣卡塔利娜岛东部和圣卡塔利娜岛西部。在每个地点采集的海水样本显示,总体氮可用性较低,但铵和尿素的含量往往高于硝酸盐。我们还对采集到的每片海藻叶片的内部氮含量进行了量化,其与采集时的环境氮浓度呈正相关。我们观察到,两种海藻都很容易吸收硝酸盐、铵和尿素,其中M. pyrifera吸收硝酸盐和铵的效率高于E. arborea。两种海藻吸收尿素的效率都随着内部氮百分含量的降低而提高。我们的研究结果表明,这些海带很容易吸收研究较少的、更短暂的氮形式,随着氮供应量的减少,尿素的吸收可能会增加。
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来源期刊
Journal of Phycology
Journal of Phycology 生物-海洋与淡水生物学
CiteScore
6.50
自引率
3.40%
发文量
69
审稿时长
2 months
期刊介绍: The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, acquaculturist, systematist, geneticist, and biochemist. The Journal also welcomes research that emphasizes algal interactions with other organisms and the roles of algae as components of natural ecosystems.
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