Case where a mesoscale cyclonic eddy suppresses primary production: A Stratification-Lock hypothesis

Mikaelyan, Alexander S.; Зацепин, А. Г.; Kubryakov, A. A.; Подымов, О. И.; Мошаров, С. А.; Паутова, Л. А.; Fedorov, Alexey V.; Ocherednik, Oksana A.

doi:10.1016/j.pocean.2023.102984

Cited by 5 publications

(1 citation statement)

References 69 publications

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“…In October 2017, three cyclonic eddies in the deep‐water basin increased Chl and stimulated the growth of large‐celled diatoms P. calcar‐avis and Hemiaulus hauckii (Mikaelyan et al., 2020). On the contrary, in August 2021, a cyclonic eddy in the centre of the sea limited the growth of phytoplankton, suppressing vertical turbulence under special meteorological and hydrological conditions (Mikaelyan et al., 2023).…”

Section: Introductionmentioning

confidence: 99%

Effect of a cyclonic eddy on phytoplankton: A bioassay experiment

Mikaelyan,

Lifanchuk,

Mosharov

et al. 2024

Marine Ecology

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Cyclonic eddies often increase the primary productivity of marine ecosystems. However, the study of their influence on the taxonomic structure and productivity of plankton is complex due to the short‐term and mesoscale nature of the action of eddies. In a laboratory bioassay experiment, we simulated two mechanisms of eddy's effect on the deep phytoplankton maximum: an increase in the upward flow of deep nutrients and illumination. Doubling of nutrient additions compared to control increased chlorophyll's specific growth rate (SGR) 1.7‐fold over 12 days while doubling the light intensity increased SGR by 3.5 times. During the first 4 days of the experiment, at the exponential growth stage, SGR of carbon biomass was maximum with the simultaneous doubling of nutrients and light (0.44 day−1). It was statistically significantly higher than at increased nutrients but not light. These results suggest that nutrient deficiencies were less crucial for phytoplankton growth than light. The increase in the phytoplankton biomass was mainly due to the growth of a large‐celled diatom Pseudosolenia calcar‐avis. It showed the highest SGR (1.15–1.28 day−1) at increased nutrients and/or light, resulting in high wet biomass of 2–3 g m−3 over 4 days. The ecological meaning of the obtained results is as follows. First, in the eddy, where the deep phytoplankton maximum is located close to the nutricline, its rise to more illuminated layers results in higher phytoplankton growth than the shortening distance to the nutricline. Second, increases in the upward flow of nutrients and light intensity, separate or simultaneous, stimulate the rapid reproduction of large‐celled diatoms that increase the carbon‐to‐chlorophyll ratio by 2–4 times. Third, exposure to a typical Black Sea mesoscale cyclonic eddy can lead to phytoplankton blooms in the thermocline within a few days.

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Section: Introductionmentioning

confidence: 99%

Effect of a cyclonic eddy on phytoplankton: A bioassay experiment

Mikaelyan,

Lifanchuk,

Mosharov

et al. 2024

Marine Ecology

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Investigation of the Benguela upwelling eddies using Lagrangian modeling methods

Belonenko,

Budyansky,

Akhtyamova

et al. 2024

Ocean Dynamics

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Elevated Heterotrophic Prokaryotic Production Supported by Low Nucleic Acid Prokaryotes at a Cyclonic Eddy Edge in the Northwest Pacific

Ni,

Chen,

Shen

et al. 2024

JGR Oceans

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The cyclonic eddy uplifts nutrient‐rich seawater into the euphotic zone, typically directly enhancing phytoplankton abundance and primary production. However, its impact on heterotrophic prokaryotic production (HPP) remains unclear due to the complex interplay of multiple indirect factors governing this process. Here, we conducted a comprehensive investigation of the distribution of picophytoplankton and heterotrophic prokaryotes, prokaryotic community structure, and HPP within a cyclonic eddy in the western North Pacific subtropical gyre. The results indicated that despite the higher abundance of picophytoplankton accompanied by nutrient upwelling at the eddy core compared to the edge, higher levels of HPP were observed at the eddy edge between 100 and 200 m, consistent with the distribution of the low nucleic acid content (LNA) prokaryotes. The significant positive correlation between HPP and the proportion of LNA group in total heterotrophic prokaryotes suggested a primary contribution from the LNA group over the high nucleic acid content (HNA) group. SAR11, a typical member of the LNA group, may primarily contribute to the elevated HPP observed at the eddy edge. The changes in temperature, nutrients, and light intensity induced by the cyclonic eddy may significantly influence the distribution and activity of HNA and LNA groups, potentially exerting a greater impact on HPP compared to phytoplankton‐related factors. These findings contribute to understanding the underlying mechanisms of HPP responses to cyclonic eddies in the oligotrophic open ocean.

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Case where a mesoscale cyclonic eddy suppresses primary production: A Stratification-Lock hypothesis

Cited by 5 publications

References 69 publications

Effect of a cyclonic eddy on phytoplankton: A bioassay experiment

Effect of a cyclonic eddy on phytoplankton: A bioassay experiment

Investigation of the Benguela upwelling eddies using Lagrangian modeling methods

Elevated Heterotrophic Prokaryotic Production Supported by Low Nucleic Acid Prokaryotes at a Cyclonic Eddy Edge in the Northwest Pacific

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