Microbial dietary preference and interactions affect the export of lipids to the deep ocean

Author:

Behrendt Lars1ORCID,Alcolombri Uria2ORCID,Hunter Jonathan E.3ORCID,Smriga Steven4,Mincer Tracy5ORCID,Lowenstein Daniel P.3ORCID,Yawata Yutaka6,Peaudecerf François J.47ORCID,Fernandez Vicente I.4,Fredricks Helen F.3ORCID,Almblad Henrik8ORCID,Harrison Joe J.8ORCID,Stocker Roman4ORCID,Van Mooy Benjamin A. S.3ORCID

Affiliation:

1. Department of Organismal Biology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden.

2. Department of Plant and Environmental Sciences, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel.

3. Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.

4. Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, Eidgenössische Technische Hochschule Zürich (ETHZ), Zürich, Switzerland.

5. Florida Atlantic University, Wilkes Honors College, Jupiter, FL, USA.

6. Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan.

7. University of Rennes, CNRS, Institut de Physique de Rennes, Rennes, France.

8. Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada.

Abstract

Lipids comprise a significant fraction of sinking organic matter in the ocean and play a crucial role in the carbon cycle. Despite this, our understanding of the processes that control lipid degradation is limited. We combined nanolipidomics and imaging to study the bacterial degradation of diverse algal lipid droplets and found that bacteria isolated from marine particles exhibited distinct dietary preferences, ranging from selective to promiscuous degraders. Dietary preference was associated with a distinct set of lipid degradation genes rather than with taxonomic origin. Using synthetic communities composed of isolates with distinct dietary preferences, we showed that lipid degradation is modulated by microbial interactions. A particle export model incorporating these dynamics indicates that metabolic specialization and community dynamics may influence lipid transport efficiency in the ocean’s mesopelagic zone.

Publisher

American Association for the Advancement of Science (AAAS)

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