Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen‐fixing cyanobacterium Crocosphaera
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Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen‐fixing cyanobacterium Crocosphaera. / Filella, Alba; Umbricht, Jacqueline; Klett, Angelina; Vogts, Angela; Vannier, Thomas; Grosso, Olivier; Voss, Maren; Riemann, Lasse; Benavides, Mar.
In: Limnology and Oceanography Letters, 2024.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Dissolved organic matter offsets the detrimental effects of climate change in the nitrogen‐fixing cyanobacterium Crocosphaera
AU - Filella, Alba
AU - Umbricht, Jacqueline
AU - Klett, Angelina
AU - Vogts, Angela
AU - Vannier, Thomas
AU - Grosso, Olivier
AU - Voss, Maren
AU - Riemann, Lasse
AU - Benavides, Mar
PY - 2024
Y1 - 2024
N2 - 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.
AB - 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.
U2 - 10.1002/lol2.10380
DO - 10.1002/lol2.10380
M3 - Journal article
JO - Limnology And Oceanography Letters
JF - Limnology And Oceanography Letters
SN - 2378-2242
ER -
ID: 384494279