High‐frequency sampling captures variability in phytoplankton population‐specific periodicity, growth, and productivity

IF 3.8 1区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Pub Date : 2024-09-18 DOI:10.1002/lno.12683

Annette M. Hynes, Jordan Winter, Chris T. Berthiaume, Eric Shimabukuro, Kelsy Cain, Angelicque White, E. Virginia Armbrust, François Ribalet

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Abstract

The Hawaii Ocean Time‐series (HOT) at Station ALOHA (22.75°N, 158°W) in the North Pacific Subtropical Gyre (NPSG) serves as a critical vantage point for observing plankton biomass production and its ecological implications. However, the HOT program's near‐monthly sampling frequency does not capture shorter time scale variability in phytoplankton populations. To address this gap, we deployed the SeaFlow flow cytometer for continuous monitoring during HOT cruises from 2014 to 2021. This approach allowed us to examine variations in the surface abundance and cell carbon content of specific phytoplankton groups: the cyanobacteria Prochlorococcus, Synechococcus, and Crocosphaera as well as a range of small eukaryotic phytoplankton ( 5 μm). Our data showed that daily to monthly variability in Prochlorococcus and Synechococcus abundance matches seasonal and interannual variability, while small eukaryotic phytoplankton and Crocosphaera showed the highest seasonal and interannual fluctuations. The study also found that eukaryotic phytoplankton and Crocosphaera had higher median cellular growth rates (0.076 and , respectively) compared to Prochlorococcus and Synechococcus (0.037 and , respectively). These variances in abundance and growth rates indicate that shifts in the community structure significantly impact primary productivity in the NPSG. Our results underscore the importance of daily to monthly phytoplankton dynamics in ecosystem function and carbon cycling.

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高频采样捕捉浮游植物种群特定周期、生长和生产力的变异性

位于北太平洋亚热带环流（NPSG）ALOHA 站（北纬 22.75 度，西经 158 度）的夏威夷海洋时间序列（HOT）是观测浮游生物生物量生产及其生态影响的重要制高点。然而，HOT 计划的近月采样频率无法捕捉浮游植物种群在较短时间内的变化。为了弥补这一不足，我们在 2014 年至 2021 年的 HOT 巡航期间部署了 SeaFlow 流式细胞仪进行连续监测。通过这种方法，我们可以研究特定浮游植物群的表面丰度和细胞碳含量的变化：蓝藻原绿球藻、中链球藻和栉水母以及一系列小型真核浮游植物（5 μm）。我们的数据显示，原绿球藻和 Synechococcus 丰度的日至月变化与季节和年际变化相匹配，而小型真核浮游植物和 Crocosphaera 的季节和年际波动最大。研究还发现，真核浮游植物和 Crocosphaera 的细胞生长率中值（分别为 0.076 和Ⅴ）高于原绿球藻和 Synechococcus（分别为 0.037 和Ⅴ）。丰度和生长率的这些差异表明，群落结构的变化对 NPSG 的初级生产力有重大影响。我们的研究结果凸显了浮游植物日、月动态在生态系统功能和碳循环中的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.