Characterization of a Southern Ocean deep chlorophyll maximum: Response of phytoplankton to light, iron, and manganese enrichment

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Pauline Latour, Sam Eggins, Pier van der Merwe, Lennart T. Bach, Philip W. Boyd, Michael J. Ellwood, Andrew R. Bowie, Kathrin Wuttig, Robert F. Strzepek
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引用次数: 0

Abstract

Southern Ocean phytoplankton growth is limited by low iron (Fe) supply and irradiance, impacting the strength of the biological carbon pump. Unfavorable upper ocean conditions, such as low nutrient concentrations, can lead to the formation of deep chlorophyll or biomass maxima (DCM/DBM). While common in the Southern Ocean, these features remain understudied due to their subsurface location. To increase our understanding of their occurrence, we studied the responses of phytoplankton communities from a Southern Ocean DCM to increasing light, Fe, and manganese (Mn) levels. The DCM communities were light- and Fe-limited, but light limitation did not increase phytoplankton Fe requirements. The greatest physiological responses were observed under combined Fe/light additions, which stimulated macronutrient drawdown, biomass production and the growth of large diatoms. Combined Mn/light additions induced subtle changes in Fe uptake rates and community composition, suggesting species-specific Mn requirements. These results provide valuable information on Southern Ocean DCM phytoplankton physiology.

Abstract Image

Abstract Image

南大洋深海叶绿素最大值的特征:浮游植物对光、铁和锰富集的响应
南大洋浮游植物的生长受到低铁(Fe)供应量和辐照度的限制,影响了生物碳泵的强度。低营养浓度等不利的上层海洋条件会导致深层叶绿素或生物量最大值(DCM/DBM)的形成。虽然这些现象在南大洋很常见,但由于其位于次表层,对它们的研究仍然不足。为了加深对这些现象的了解,我们研究了南大洋 DCM 浮游植物群落对增加光照、铁和锰(Mn)含量的反应。DCM 群落受光照和铁元素的限制,但光照限制并不增加浮游植物对铁元素的需求。在联合添加铁/光的情况下,观察到最大的生理反应,这刺激了宏量营养素的减少、生物量的产生和大型硅藻的生长。锰/光联合添加会引起铁吸收率和群落组成的微妙变化,表明物种对锰有特定的需求。这些结果为南大洋 DCM 浮游植物生理学提供了宝贵的信息。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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