Organic and inorganic nutrients modulate taxonomic diversity and trophic strategies of small eukaryotes in oligotrophic oceans.

Naomi Villiot, Amy E Maas, Alex J Poulton, Leocadio Blanco-Bercial
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Abstract

As the oligotrophic gyres expand due to global warming, exacerbating resource limitation impacts on primary producers, predicting changes to microbial assemblages and productivity requires knowledge of the community response to nutrient availability. This study examines how organic and inorganic nutrients influence the taxonomic and trophic composition (18S metabarcoding) of small eukaryotic plankton communities (< 200 µm) within the euphotic zone of the oligotrophic Sargasso Sea. The study was conducted by means of field sampling of natural microbial communities and laboratory incubation of these communities under different nutrient regimes. Dissimilarity in community composition increased along a depth gradient, with a homogeneous protist community within the mixed layer and distinct microbial assemblages at different depths below the deep chlorophyll maximum. A nutrient enrichment assay revealed the potential of natural microbial communities to rapidly shift in composition in response to nutrient addition. Results highlighted the importance of inorganic phosphorus availability, largely understudied compared to nitrogen, in constraining microbial diversity. Dissolved organic matter addition led to a loss of diversity, benefiting a limited number of phagotrophic and mixotrophic taxa. Nutrient history of the community sets the physiological responsiveness of the eukaryotic community to changing nutrient regimes and needs to be considered in future studies.

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有机和无机营养物调节寡营养海洋中小型真核生物的分类多样性和营养策略。
由于全球变暖导致的少营养环流扩大,加剧了资源限制对初级生产者的影响,预测微生物组合和生产力的变化需要了解群落对养分可用性的反应。本研究探讨了低营养马尾藻海富营养化带中有机和无机营养物如何影响小型真核浮游生物群落(< 200µm)的分类和营养组成(18S元条形码)。本研究通过野外取样和不同营养条件下的实验室微生物群落培养进行。群落组成差异沿深度梯度增大,混合层内原生生物群落均为均匀的,叶绿素最大值以下不同深度的微生物群落差异较大。一项营养富集试验揭示了天然微生物群落的潜力,以迅速改变组成,以响应营养添加。结果强调了无机磷有效性在限制微生物多样性方面的重要性,与氮相比,无机磷有效性在很大程度上尚未得到充分研究。溶解有机质的添加导致多样性的丧失,使有限数量的吞噬和混合营养类群受益。群落的营养史决定了真核生物群落对营养制度变化的生理反应,需要在未来的研究中加以考虑。
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3.30
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审稿时长
15 weeks
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