原绿球藻和聚球藻生理反应的低氧阈值和微量金属配额

IF 3.7 1区 地球科学 Q1 LIMNOLOGY
Joan De Vera, Yuanyuan Feng, Feixue Fu, Shun-Chung Yang, Amjad Mansour, Nicholas J. Hawco, David A. Hutchins, Seth G. John
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引用次数: 0

摘要

持续的人类活动预计将加速海洋脱氧,导致缺氧区(odz)的扩大和变浅。氧气的减少可能会影响浮游植物的生长和微量金属的吸收。在不同的O2水平(36-242 μM)下,对海洋picocyanobacteria的两个数值优势属原绿球藻MIT9313和聚球藻XM-24进行了培养实验。这些实验提供了在不同氧培养条件下浮游植物微量金属配额的一些初步数据。中度脱氧,高于缺氧水平,对原绿球藻MIT9313和聚球菌XM-24的生长和微量金属配额均无负面影响(分别为80和85 μM O2)。事实上,一些参数(如生长速率、碳固定和叶绿素荧光)表明,在这些中等脱氧水平下,生长略有增强。然而,缺氧条件(36 μM O2)显著抑制原绿球藻MIT9313的生长,这表明需要最低的O2阈值来防止O2依赖过程的中断。Synechococcus XM-24对pco2升高(1054 μatm)无显著响应,表明可能适应了变化的沿海CO 2环境。当原绿球藻MIT9313在缺氧条件下培养时,还观察到微量金属配额(金属磷比;金属/P)的变化,包括与缺氧条件相比,Fe/P增加48%,Ni/P降低48%,Co/P降低27%。这些结果与臭氧臭氧区自养相关颗粒中金属/磷比率升高形成对比,表明低氧区域浮游植物的金属摄取策略不同,或者升高的颗粒金属受到其他浮游生物类型(如异养生物)的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A low oxygen threshold for physiological responses and trace metal quotas of Prochlorococcus and Synechococcus

A low oxygen threshold for physiological responses and trace metal quotas of Prochlorococcus and Synechococcus

A low oxygen threshold for physiological responses and trace metal quotas of Prochlorococcus and Synechococcus

A low oxygen threshold for physiological responses and trace metal quotas of Prochlorococcus and Synechococcus

Continued human activity is expected to accelerate ocean deoxygenation, leading to the expansion and shallowing of oxygen-deficient zones (ODZs). This decline in oxygen may impact both phytoplankton growth and trace metal uptake. We conducted culture experiments with Prochlorococcus MIT9313 and Synechococcus XM-24, two numerically dominant genera of marine picocyanobacteria, under varying O2 levels (36–242 μM). These experiments provide some of the first data on trace metal quotas in phytoplankton under varying O2 conditions in culture. Moderate deoxygenation, above hypoxic levels, did not negatively impact the growth and trace metal quotas of either Prochlorococcus MIT9313 or Synechococcus XM-24 (80 and 85 μM O2, respectively). Indeed, some parameters (e.g., growth rate, carbon fixation and chlorophyll fluorescence) suggest slight growth enhancement at these moderate levels of deoxygenation. However, hypoxic conditions (36 μM O2) significantly inhibited the growth of Prochlorococcus MIT9313, suggesting a minimum O2 threshold needed to prevent disruptions in O2-dependent processes. Synechococcus XM-24 exhibited no significant response to elevated pCO₂ (1054 μatm), indicating possible adaptation to variable coastal CO₂ environments. Changes in trace-metal quotas (metal-to-phosphorous ratios; metal/P) were also observed when Prochlorococcus MIT9313 was cultured under hypoxia, including up to 48% increases in Fe/P, 48% decreases in Ni/P, and 27% decreases in Co/P, compared to oxic conditions. These results contrast with elevated metal/P ratios in autotrophic-associated particles from ODZs, suggesting either distinct metal uptake strategies by phytoplankton in low-O2 regions or that elevated particulate metals are influenced by other plankton types such as heterotrophs.

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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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