Decoupled growth and grazing rates of diatoms and green algae drive increased phytoplankton productivity on HNLC sub-Antarctic plateaux

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Andres Gutiérrez-Rodríguez, Mikel Latasa, Karl Safi, Matthew H. Pinkerton, Scott D. Nodder
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Abstract

The combination of iron limitation and microzooplankton grazing controls phytoplankton productivity and taxonomic composition in high-nutrient low-chlorophyll (HNLC) regions. While increased productivity and diatom contribution triggered by iron enrichment support this view, direct measurements of underpinning group-specific growth and grazing rates are scarce for the Southern Ocean. To assess these rates, we conducted dilution experiments coupled to high-performance liquid chromatography and flow-cytometry in sub-Antarctic waters on and off Campbell Plateau, southeast of Aotearoa-New Zealand. Off the plateau, growth and grazing were closely balanced for all groups despite a two-fold difference between slow- and fast-growing groups. On Campbell Plateau, where HNLC conditions were alleviated, the balance was disrupted, mainly by the preferential growth of diatoms and green algae, which was stimulated beyond grazing. Our results expand the recognized ability of diatoms to escape grazing control to picoplanktonic green algae that also avoid grazing and contribute significantly to phytoplankton productivity and biomass accumulation.

Abstract Image

硅藻和绿藻的生长和放牧速率的解耦驱动了亚南极高原浮游植物生产力的提高
在高营养低叶绿素区,限铁和微浮游动物放牧的组合控制着浮游植物的生产力和分类组成。虽然铁富集引发的生产力提高和硅藻贡献支持这一观点,但对南大洋特定种群的生长和放牧率的直接测量很少。为了评估这些比率,我们在新西兰奥特罗瓦东南部坎贝尔高原附近的亚南极水域进行了稀释实验,并结合了高效液相色谱和流式细胞术。在高原以外,尽管生长缓慢和生长迅速的群体之间存在两倍的差异,但所有群体的生长和放牧都接近平衡。在坎贝尔高原,HNLC条件有所缓解,但平衡被破坏,主要是受放牧以外的刺激,硅藻和绿藻优先生长。我们的研究结果将硅藻逃避放牧控制的能力扩展到微浮游绿藻,微浮游绿藻也可以避免放牧,并对浮游植物的生产力和生物量积累做出重大贡献。
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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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