Alba Filella, Jacqueline Umbricht, Angelina Klett, Angela Vogts, Thomas Vannier, Olivier Grosso, Maren Voss, Lasse Riemann, Mar Benavides
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引用次数: 0
摘要
重氮营养盐是海洋中重要的活性氮源。未来变暖和分层的加剧可能会减少营养物质的供应,从而迫使微生物群落利用溶解有机物(DOM)。由于不依赖于活性氮的供应,重氮营养盐可能会成为营养缺乏海洋中的 "赢家"。不过,它们利用 DOM 的能力可能会影响这种成功。在控制或添加 DOM 的条件下,我们将广泛分布的 Crocosphaera 培养物暴露于低度(26°C,pH 值 8.1)、中度(28°C,pH 值 8.0)和极端(30°C,pH 值 7.9)气候变化情景中。在低度和极度处理中,生长情况不理想,而在中度处理中,生长情况良好。无论在哪种处理条件下,DOM 都是首选的碳源,并在极端条件下促进了 N2 固定。这反映在光合作用基因的表达增加,以获得能量。DOM 为 Crocosphaera 提供了关键的生态优势,可能会决定未来海洋中来自重氮营养体的氮输入。
Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen-fixing cyanobacterium Crocosphaera
Diazotrophs provide a significant reactive nitrogen source in the ocean. Increased warming and stratification may decrease nutrient availability in the future, forcing microbial communities toward using dissolved organic matter (DOM). Not depending on reactive nitrogen availability, diazotrophs may be “winners” in a nutrient-depleted ocean. However, their ability to exploit DOM may influence this success. We exposed cultures of the widespread Crocosphaera to low (26°C, pH 8.1), moderate (28°C, pH 8.0), and extreme (30°C, pH 7.9) climate change scenarios, under control or DOM-amended conditions. Growth was suboptimal in the low and extreme treatments and favored in the moderate treatment. DOM was preferred as a carbon source regardless of the treatment and promoted N2 fixation in extreme conditions. This was reflected in the increased expression of photosynthesis genes to obtain energy. DOM provides Crocosphaera with a key ecological advantage, possibly dictating diazotroph-derived nitrogen inputs in the future ocean.
期刊介绍:
Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.