How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments

Oliver Müller; Lena Seuthe; Bernadette Pree; Gunnar Bratbak; Aud Larsen; Maria Lund Paulsen

doi:10.3390/microorganisms9112378

How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments

Oliver Müller^*, Lena Seuthe, Bernadette Pree, Gunnar Bratbak, Aud Larsen, Maria Lund Paulsen

^*Corresponding author for this work

Arctic Research Centre

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

3 Citations (Scopus)

Abstract

In the Arctic, seasonal changes are substantial, and as a result, the marine bacterial community composition and functions differ greatly between the dark winter and light‐intensive sum-mer. While light availability is, overall, the external driver of the seasonal changes, several internal biological interactions structure the bacterial community during shorter timescales. These include specific phytoplankton–bacteria associations, viral infections and other top‐down controls. Here, we uncover these microbial interactions and their effects on the bacterial community composition during a full annual cycle by manipulating the microbial food web using size fractionation. The most profound community changes were detected during the spring, with ‘mutualistic phytoplank-ton’—Gammaproteobacteria interactions dominating in the pre‐bloom phase and ‘substrate‐de-pendent phytoplankton’—Flavobacteria interactions during blooming conditions. Bacterivores had an overall limited effect on the bacterial community composition most of the year. However, in the late summer, grazing was the main factor shaping the community composition and transferring carbon to higher trophic levels. Identifying these small‐scale interactions improves our understand-ing of the Arctic marine microbial food web and its dynamics.

Original language	English
Article number	2378
Journal	Microorganisms
Volume	9
Issue	11
Number of pages	21
ISSN	2076-2607
DOIs	https://doi.org/10.3390/microorganisms9112378
Publication status	Published - Nov 2021

Keywords

Arctic Ocean
Bacterial community structure
Experimental manipulations
Microbial food web
Microbial resilience
Phytoplankton–bacteria association
Seasonal changes
Trophic interactions

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10.3390/microorganisms9112378Licence: CC BY

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title = "How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments",

abstract = "In the Arctic, seasonal changes are substantial, and as a result, the marine bacterial community composition and functions differ greatly between the dark winter and light‐intensive sum-mer. While light availability is, overall, the external driver of the seasonal changes, several internal biological interactions structure the bacterial community during shorter timescales. These include specific phytoplankton–bacteria associations, viral infections and other top‐down controls. Here, we uncover these microbial interactions and their effects on the bacterial community composition during a full annual cycle by manipulating the microbial food web using size fractionation. The most profound community changes were detected during the spring, with {\textquoteleft}mutualistic phytoplank-ton{\textquoteright}—Gammaproteobacteria interactions dominating in the pre‐bloom phase and {\textquoteleft}substrate‐de-pendent phytoplankton{\textquoteright}—Flavobacteria interactions during blooming conditions. Bacterivores had an overall limited effect on the bacterial community composition most of the year. However, in the late summer, grazing was the main factor shaping the community composition and transferring carbon to higher trophic levels. Identifying these small‐scale interactions improves our understand-ing of the Arctic marine microbial food web and its dynamics.",

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author = "Oliver M{\"u}ller and Lena Seuthe and Bernadette Pree and Gunnar Bratbak and Aud Larsen and Paulsen, {Maria Lund}",

year = "2021",

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doi = "10.3390/microorganisms9112378",

language = "English",

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journal = "Microorganisms",

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How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments. / Müller, Oliver; Seuthe, Lena; Pree, Bernadette et al.
In: Microorganisms, Vol. 9, No. 11, 2378, 11.2021.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

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T1 - How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments

AU - Müller, Oliver

AU - Seuthe, Lena

AU - Pree, Bernadette

AU - Bratbak, Gunnar

AU - Larsen, Aud

AU - Paulsen, Maria Lund

PY - 2021/11

Y1 - 2021/11

N2 - In the Arctic, seasonal changes are substantial, and as a result, the marine bacterial community composition and functions differ greatly between the dark winter and light‐intensive sum-mer. While light availability is, overall, the external driver of the seasonal changes, several internal biological interactions structure the bacterial community during shorter timescales. These include specific phytoplankton–bacteria associations, viral infections and other top‐down controls. Here, we uncover these microbial interactions and their effects on the bacterial community composition during a full annual cycle by manipulating the microbial food web using size fractionation. The most profound community changes were detected during the spring, with ‘mutualistic phytoplank-ton’—Gammaproteobacteria interactions dominating in the pre‐bloom phase and ‘substrate‐de-pendent phytoplankton’—Flavobacteria interactions during blooming conditions. Bacterivores had an overall limited effect on the bacterial community composition most of the year. However, in the late summer, grazing was the main factor shaping the community composition and transferring carbon to higher trophic levels. Identifying these small‐scale interactions improves our understand-ing of the Arctic marine microbial food web and its dynamics.

AB - In the Arctic, seasonal changes are substantial, and as a result, the marine bacterial community composition and functions differ greatly between the dark winter and light‐intensive sum-mer. While light availability is, overall, the external driver of the seasonal changes, several internal biological interactions structure the bacterial community during shorter timescales. These include specific phytoplankton–bacteria associations, viral infections and other top‐down controls. Here, we uncover these microbial interactions and their effects on the bacterial community composition during a full annual cycle by manipulating the microbial food web using size fractionation. The most profound community changes were detected during the spring, with ‘mutualistic phytoplank-ton’—Gammaproteobacteria interactions dominating in the pre‐bloom phase and ‘substrate‐de-pendent phytoplankton’—Flavobacteria interactions during blooming conditions. Bacterivores had an overall limited effect on the bacterial community composition most of the year. However, in the late summer, grazing was the main factor shaping the community composition and transferring carbon to higher trophic levels. Identifying these small‐scale interactions improves our understand-ing of the Arctic marine microbial food web and its dynamics.

KW - Arctic Ocean

KW - Bacterial community structure

KW - Experimental manipulations

KW - Microbial food web

KW - Microbial resilience

KW - Phytoplankton–bacteria association

KW - Seasonal changes

KW - Trophic interactions

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DO - 10.3390/microorganisms9112378

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SN - 2076-2607

VL - 9

JO - Microorganisms

JF - Microorganisms

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How microbial food web interactions shape the arctic ocean bacterial community revealed by size fractionation experiments

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