钙化增加了碳供应、光合作用和一种全球分布的嗜茧动物的生长

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Austin R. Grubb, Christopher T. Johns, Matthew G. Hayden, Adam V. Subhas, Kimberlee Thamatrakoln, Kay D. Bidle
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引用次数: 0

摘要

嗜钙珊瑚能固定有机碳,并产生方解石板(钙化球),压载有机物,促进碳输出。光合作用会消耗二氧化碳,而钙化作用则会产生二氧化碳,这就引起了关于褐藻是碳净汇还是碳源的问题。我们描述了 Emiliania huxleyi(CCMP374)钙化和非钙化("裸体")表型的生理学特征,并研究了钙化与光合作用之间的关系。两种表型的生长和光生理参数都随光照增加而增加,直至达到中光照(150 μmol photons m-2 s-1)最大值。钙化细胞的特点是光生理学增强,光抑制减少。此外,与裸细胞相比,钙化细胞在中光照到高光照(150-2000 μmol photons m-2 s-1)条件下,碳酸氢盐运输的增强导致了更高的颗粒有机碳固定和生长速率。在中强光照条件下,茧石产量同样很高,但在强光条件下,茧石脱落率要低 3 倍(1.2 个茧石 cell-1 h-1 与 0.35 个茧石 cell-1 h-1)。这种不同脱落的细胞机理尚不清楚,但它是与光有关的茧壳维持控制的基础。我们的数据表明,在强光下,茧石会遮蔽细胞,而与钙化相关的碳酸氢盐运输增强会增加可用于有机碳固定的内部碳供应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Calcification increases carbon supply, photosynthesis, and growth in a globally distributed coccolithophore

Calcification increases carbon supply, photosynthesis, and growth in a globally distributed coccolithophore

Coccolithophores fix organic carbon and produce calcite plates (coccoliths) that ballast organic matter and facilitate carbon export. Photosynthesis consumes carbon dioxide, while calcification produces it, raising questions about whether coccolithophores are a net sink or source of carbon. We characterized the physiology of calcified and noncalcified (“naked”) phenotypes of Emiliania huxleyi (CCMP374) and investigated the relationship between calcification and photosynthesis across a gradient of light (25–2000 μmol photons m−2 s−1) spanning the euphotic zone. Growth and photophysiological parameters increased with light until reaching a mid-light (150 μmol photons m−2 s−1) maximum for both phenotypes. Calcified cells were characterized by enhanced photophysiology and less photoinhibition. Further, enhanced bicarbonate transport in calcified cells led to higher rates of particulate organic carbon fixation and growth compared to naked cells at mid-light to high light (150–2000 μmol photons m−2 s−1). Coccolith production was similarly high at mid and high light, but the rate of coccolith shedding was >3-fold lower at high-light (1.2 vs. 0.35 coccoliths cell−1 h−1). The cellular mechanims(s) of this differential shedding remain unknown and underly light-related controls on coccosphere maintenance. Our data suggest coccoliths shade cells at high light and that enhanced bicarbonate transport associated with calcification increases internal carbon supplies available for organic carbon fixation.

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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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