Nutrient availability influences the thermal response of marine diatoms

作者：Mengwen Pang, Kailin Liu, Bingzhang Chen, Xiaodong Zhang, Zuyuan Gao, Zhimeng Xu, Yehui Tan, Jing Yang, Hongbin Liu · 发表于：Limnology and Oceanography · 年份：2024 · DOI：10.1002/lno.12671 · 被引用次数：10 · 研究领域：Marine and coastal ecosystems、Marine Bivalve and Aquaculture Studies、Physiological and biochemical adaptations

Abstract Understanding how phytoplankton growth responds to temperature is critical for forecasting marine productivity in a warming ocean. While previous laboratory studies have shown that phytoplankton thermal traits such as optimal temperature ( T opt ) can be affected by nutrient availability, it is unclear whether this can be extrapolated to natural communities. To address this, we tested the impacts of nutrient availability on the thermal responses of two cosmopolitan diatom genera, Pseudo‐nitzschia and Leptocylindrus , through a series of in situ manipulation experiments on natural phytoplankton communities. Analysis of the thermal performance curves revealed that nutrient limitation during summer not only limited the growth of these two genera but also reduced their T opt and the maximum growth rates ( μ max ). T opt was close to or lower than in situ temperature under ambient nutrient conditions, suggesting that further warming may have a detrimental effect on their growth. However, increasing nutrient supply could counteract this by enhancing T opt and μ max . To further confirm the interactive effects of nutrients and temperature on diatoms, we analyzed a 20‐yr monitoring dataset on Pseudo‐nitzschia , Leptocylindrus , and the whole diatom assembly in Hong Kong coastal waters. We found that the abundances of marine diatoms were significantly higher at high temperatures under nutrient‐rich environments while relatively low under low nutrient concentrations. Findings ...