Bacteria-mediated aggregation of the marine phytoplankton Thalassiosira weissflogii and Nannochloropsis oceanica

Tran, NAT; Tamburic, B; Evenhuis, CR; Seymour, JR

Bacteria-mediated aggregation of the marine phytoplankton Thalassiosira weissflogii and Nannochloropsis oceanica

Tran, NAT Tamburic, B

Evenhuis, CR Seymour, JR

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: Journal of Applied Phycology, 2020, 32, (6), pp. 3735-3748
Issue Date:: 2020-12-01

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Field	Value	Language
dc.contributor.author	Tran, NAT
dc.contributor.author	Tamburic, B https://orcid.org/0000-0001-5720-9380
dc.contributor.author	Evenhuis, CR
dc.contributor.author	Seymour, JR
dc.date.accessioned	2020-12-03T04:48:43Z
dc.date.available	2020-12-03T04:48:43Z
dc.date.issued	2020-12-01
dc.identifier.citation	Journal of Applied Phycology, 2020, 32, (6), pp. 3735-3748
dc.identifier.issn	0921-8971
dc.identifier.issn	1573-5176
dc.identifier.uri	http://hdl.handle.net/10453/144484
dc.description.abstract	© 2020, The Author(s). The ecological relationships between heterotrophic bacteria and marine phytoplankton are complex and multifaceted, and in some instances include the bacteria-mediated aggregation of phytoplankton cells. It is not known to what extent bacteria stimulate aggregation of marine phytoplankton, the variability in aggregation capacity across different bacterial taxa or the potential role of algogenic exopolymers in this process. Here we screened twenty bacterial isolates, spanning nine orders, for their capacity to stimulate aggregation of two marine phytoplankters, Thalassiosira weissflogii and Nannochloropsis oceanica. In addition to phytoplankton aggregation efficiency, the production of exopolymers was measured using Alcian Blue. Bacterial isolates from the Rhodobacterales, Flavobacteriales and Sphingomonadales orders stimulated the highest levels of cell aggregation in phytoplankton cultures. When co-cultured with bacteria, exopolymer concentration accounted for 34.1% of the aggregation observed in T. weissflogii and 27.7% of the aggregation observed in N. oceanica. Bacteria-mediated aggregation of phytoplankton has potentially important implications for mediating vertical carbon flux in the ocean and in extracting phytoplankton cells from suspension for biotechnological applications.
dc.language	English
dc.publisher	SPRINGER
dc.relation	http://purl.org/au-research/grants/arc/DP180100838
dc.relation.ispartof	Journal of Applied Phycology
dc.relation.isbasedon	10.1007/s10811-020-02252-8
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0607 Plant Biology, 0704 Fisheries Sciences, 1002 Environmental Biotechnology
dc.subject.classification	Marine Biology & Hydrobiology
dc.title	Bacteria-mediated aggregation of the marine phytoplankton Thalassiosira weissflogii and Nannochloropsis oceanica
dc.type	Journal Article
utslib.citation.volume	32
utslib.for	0607 Plant Biology
utslib.for	0704 Fisheries Sciences
utslib.for	1002 Environmental Biotechnology
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Strength - ithree - Institute of Infection, Immunity and Innovation
utslib.copyright.status	open_access	*
dc.date.updated	2020-12-03T04:48:10Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	32
utslib.citation.issue	6

Abstract:

© 2020, The Author(s). The ecological relationships between heterotrophic bacteria and marine phytoplankton are complex and multifaceted, and in some instances include the bacteria-mediated aggregation of phytoplankton cells. It is not known to what extent bacteria stimulate aggregation of marine phytoplankton, the variability in aggregation capacity across different bacterial taxa or the potential role of algogenic exopolymers in this process. Here we screened twenty bacterial isolates, spanning nine orders, for their capacity to stimulate aggregation of two marine phytoplankters, Thalassiosira weissflogii and Nannochloropsis oceanica. In addition to phytoplankton aggregation efficiency, the production of exopolymers was measured using Alcian Blue. Bacterial isolates from the Rhodobacterales, Flavobacteriales and Sphingomonadales orders stimulated the highest levels of cell aggregation in phytoplankton cultures. When co-cultured with bacteria, exopolymer concentration accounted for 34.1% of the aggregation observed in T. weissflogii and 27.7% of the aggregation observed in N. oceanica. Bacteria-mediated aggregation of phytoplankton has potentially important implications for mediating vertical carbon flux in the ocean and in extracting phytoplankton cells from suspension for biotechnological applications.

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http://hdl.handle.net/10453/144484