Dynamic change in an ocean desert: Microbial diversity and trophic transfer along the 110 °E meridional in the Indian Ocean

Raes, EJ; Hörstmann, C; Landry, MR; Beckley, LE; Marin, M; Thompson, P; Antoine, D; Focardi, A; O'Brien, J; Ostrowski, M; Waite, AM

Dynamic change in an ocean desert: Microbial diversity and trophic transfer along the 110 °E meridional in the Indian Ocean

Raes, EJ Hörstmann, C Landry, MR Beckley, LE Marin, M Thompson, P Antoine, D Focardi, A

O'Brien, J Ostrowski, M

Waite, AM

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Publisher:: PERGAMON-ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Deep-Sea Research Part II: Topical Studies in Oceanography, 2022, 201
Issue Date:: 2022-07-01

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Field	Value	Language
dc.contributor.author	Raes, EJ
dc.contributor.author	Hörstmann, C
dc.contributor.author	Landry, MR
dc.contributor.author	Beckley, LE
dc.contributor.author	Marin, M
dc.contributor.author	Thompson, P
dc.contributor.author	Antoine, D
dc.contributor.author	Focardi, A https://orcid.org/0000-0002-0340-4225
dc.contributor.author	O'Brien, J
dc.contributor.author	Ostrowski, M https://orcid.org/0000-0002-4357-3023
dc.contributor.author	Waite, AM
dc.date.accessioned	2023-02-03T00:10:53Z
dc.date.available	2023-02-03T00:10:53Z
dc.date.issued	2022-07-01
dc.identifier.citation	Deep-Sea Research Part II: Topical Studies in Oceanography, 2022, 201
dc.identifier.issn	0967-0645
dc.identifier.issn	1879-0100
dc.identifier.uri	http://hdl.handle.net/10453/165868
dc.description.abstract	The eastern Indian Ocean is among the most oligotrophic regions in the world and has been described as an ocean desert. Limited information exists on microbial community profiles from marker gene data, and an open question in this system is how energy is transported from the base of the food web to higher trophic levels. Here we show that, along a 3300 km long transect in the ultra-oligotrophic eastern Indian Ocean, both alpha and beta diversity metrics for prokaryotic and eukaryotic trophic groups revealed remarkably strong latitudinal trends. The latitudinal Shannon diversity pattern for autotrophic eukaryotes furthermore aligned with the isotopic δ13C ratios of particulate organic carbon, fractionated zooplankton and hand-picked fish larvae, suggesting a close trophic linkage between autotrophic eukaryotes and higher trophic levels. Our data also showed an increasing contribution of eukaryotic mixotrophs and a high contribution of heterotrophic eukaryotes towards warmer waters. These findings highlight that not only the recycling of organic matter via bacterial regeneration is important in this system but that mixo- and heterotrophic eukaryotes play a major role in redistributing energy within the marine food web of these oligotrophic waters. Our data provide a baseline to understand how environmental changes such as warming surface waters might impact the open-ocean food web in this oligotrophic basin.
dc.language	English
dc.publisher	PERGAMON-ELSEVIER SCIENCE LTD
dc.relation	http://purl.org/au-research/grants/arc/DP150102326
dc.relation.ispartof	Deep-Sea Research Part II: Topical Studies in Oceanography
dc.relation.isbasedon	10.1016/j.dsr2.2022.105097
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0402 Geochemistry, 0405 Oceanography, 0602 Ecology
dc.subject.classification	Oceanography
dc.title	Dynamic change in an ocean desert: Microbial diversity and trophic transfer along the 110 °E meridional in the Indian Ocean
dc.type	Journal Article
utslib.citation.volume	201
utslib.for	0402 Geochemistry
utslib.for	0405 Oceanography
utslib.for	0602 Ecology
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access	*
dc.date.updated	2023-02-03T00:10:50Z
pubs.publication-status	Published
pubs.volume	201

Abstract:

The eastern Indian Ocean is among the most oligotrophic regions in the world and has been described as an ocean desert. Limited information exists on microbial community profiles from marker gene data, and an open question in this system is how energy is transported from the base of the food web to higher trophic levels. Here we show that, along a 3300 km long transect in the ultra-oligotrophic eastern Indian Ocean, both alpha and beta diversity metrics for prokaryotic and eukaryotic trophic groups revealed remarkably strong latitudinal trends. The latitudinal Shannon diversity pattern for autotrophic eukaryotes furthermore aligned with the isotopic δ13C ratios of particulate organic carbon, fractionated zooplankton and hand-picked fish larvae, suggesting a close trophic linkage between autotrophic eukaryotes and higher trophic levels. Our data also showed an increasing contribution of eukaryotic mixotrophs and a high contribution of heterotrophic eukaryotes towards warmer waters. These findings highlight that not only the recycling of organic matter via bacterial regeneration is important in this system but that mixo- and heterotrophic eukaryotes play a major role in redistributing energy within the marine food web of these oligotrophic waters. Our data provide a baseline to understand how environmental changes such as warming surface waters might impact the open-ocean food web in this oligotrophic basin.

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