海洋微生物之间建立的相互作用,即浮游植物-细菌,是有机物出口到表层海洋深度和再循环平衡的关键。尽管如此,它们在浮游植物对CO2浓度升高的反应中的作用知之甚少。这里,我们表明,世界主义的艾米利亚·赫克斯莱伊(E.huxleyi)增加的CO2受到与细菌共存的影响。具体来说,在盛开期(可能也与营养浓度有关)以及与苦参素共存的情况下,胡氏大肠杆菌在CO2浓度升高时的生长速率降低(I.深渊)和短杆菌属。此外,二氧化碳浓度的增加也影响了胡氏大肠杆菌的细胞含量估计,增加有机碳和减少无机碳,在我的深渊面前,但不是短杆菌属。同时,细菌分离株只在与E.huxleyi共存的情况下存活,但目前二氧化碳浓度完全是深渊。细菌物种或特定群体对预计的二氧化碳上升的反应,以及对E.huxleyi的伴随作用,可能会影响微生物循环和有机物出口之间的平衡,对大气中的二氧化碳有影响。
The interactions established between marine microbes, namely phytoplankton-bacteria, are key to the balance of organic matter export to depth and recycling in the surface ocean. Still, their role in the response of phytoplankton to rising CO2 concentrations is poorly understood. Here, we show that the response of the cosmopolitan Emiliania huxleyi (E. huxleyi) to increasing CO2 is affected by the coexistence with bacteria. Specifically, decreased growth rate of E. huxleyi at enhanced CO2 concentrations was amplified in the bloom phase (potentially also related to nutrient concentrations) and with the coexistence with Idiomarina abyssalis (I. abyssalis) and Brachybacterium sp. In addition, enhanced CO2 concentrations also affected E. huxleyi\'s cellular content estimates, increasing organic and decreasing inorganic carbon, in the presence of I. abyssalis, but not Brachybacterium sp. At the same time, the bacterial isolates only survived in coexistence with E. huxleyi, but exclusively I. abyssalis at present CO2 concentrations. Bacterial species or group-specific responses to the projected CO2 rise, together with the concomitant effect on E. huxleyi, might impact the balance between the microbial loop and the export of organic matter, with consequences for atmospheric carbon dioxide.