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| Main Authors: | , , , , , , , |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Water research
2026
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| Subjects: | |
| Online Access: | https://pubmed.ncbi.nlm.nih.gov/41850170/ |
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Table of Contents:
- Thermal stress drives coastal microbiome transitions from phototrophic carbon fixation to energy-conserving chemotrophy. Ren, Lijuan Zhu, Ying Chen, Haiming He, Dan Li, Biao Song, Xingyu Yang, Yang Wu, Qinglong L Microbiota Carbon Cycle Phototrophic Processes Photosynthesis Seawater Cyanobacteria Localized thermal discharge offers a natural analog for extreme warming, providing unique insights into how thermal stress shape microbial metabolism in coastal ecosystems. By examining taxonomic and functional dynamics across a pronounced thermal gradient (30-36°C), we identified a distinct transition near 33°C, marked by a systematic decline in phototrophic cyanobacteria (e.g., Synechococcus) and concurrent downregulation of genes involved in oxygenic photosynthesis and the Calvin-Benson-Bassham (CBB) cycle in subtropical Daya Bay. This phototrophic collapse coincided with enrichment of chemoautotrophic (Rhodobacteraceae, Halieaceae) and heterotrophic (SAR11 Ia) lineages, alongside upregulation of energy-efficient chemolithoautotrophic pathways (Wood-Ljungdahl and HP/HB cycle). This metabolic transition near 33°C was reinforced by enhanced energy-generating metabolism (glycolysis, TCA cycle, β-oxidation), dissimilatory nitrogen/sulfur reduction (DNRA: narH/nirB/nirD; DSR: aprA/aprB), and thiosulfate oxidation (SOX: soxY/soxZ/soxD), accelerating nutrient cycling. Microbial adaptation was further reinforced by the upregulation of thermal stress-response genes, including hspR, hspQ, rpoH, and cytochrome oxidases. Collectively, local seawater warming induces a survival strategy prioritizing energy conservation and chemotrophy over phototrophic carbon fixation, reprogramming ecosystem function at the expense of primary production and carbon sequestration while accelerating nitrogen/sulfur turnover. This metabolic transition underscores microbial plasticity but signals vulnerability in critical coastal blue carbon sinks under thermal stress.