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Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef

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Abstract

Heterotrophic bacteria typically take up directly dissolved organic matter due to the small molecular size, although both particulate and dissolved organic matter have labile (easily consumed) compounds. Tropical coastal waters are important ecosystems because of their high productivity. However, few studies have determined bacterial cycling (i.e. carbon uptake by bacteria and allocation for bacterial biomass and respiration) of dissolved organic carbon in coastal tropical waters, and none has determined bacterial cycling of total and dissolved organic carbon simultaneously. In this study we followed bacterial biomass and production, and organic carbon changes over short-term (12 days) dark incubations with (total organic carbon, TOC) and without particulate organic carbon additions (dissolved organic carbon, DOC). The study was performed at three sites along the middle stretch of the Great Barrier Reef (GBR) during the dry and wet seasons. Our results show that the bacterial growth efficiency is low (0.1–11.5%) compared to other coastal tropical systems, and there were no differences in the carbon cycling between organic matter sources, seasons or locations. Nonetheless, more carbon was consumed in the TOC compared to the DOC incubations, although the proportion allocated to biomass and respiration was similar. This suggests that having more bioavailable substrate in the particulate form did not benefit bacteria. Overall, our study indicates that when comparing the obtained respiration rates with previously measured primary production rates, the GBR is a heterotrophic system. More detailed studies are required to fully explore the mechanisms used by bacteria to cycle TOC and DOC in tropical coastal waters.

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Abbreviations

BA:

Bacterial abundance

BB:

Bacterial biomass

BDOC:

Bioavailable DOC

BGE:

Bacterial growth efficiency

BP:

Bacterial production

BCD:

Bacterial carbon demand

Cell BP:

Cell specific bacterial production

DOC:

Dissolved organic carbon

DOM:

Dissolved organic matter

OM:

Organic matter

POC:

Particulate organic carbon

POM:

Particulate organic matter

TOC:

Total organic carbon

TOM:

Total organic matter

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Acknowledgements

We thank the crew of the R.V. Cape Ferguson for help at sea. The help of the Cruise leader (Irena Zagorskis) and other participants (Paul Costello and Johnstone Davidson) in obtaining the field data is also acknowledged. Two anonymous reviewers are also acknowledged for their constructive comments that improved substantially the quality of this manuscript.

Funding

Financial support for this study was provided by the Australian Institute of Marine Science. The field data included in the manuscript was obtained with support from the Great Barrier Reef Marine Park Authority, through funding from the Australian Government Reef Program and from the Australian Institute of Marine Science. Thanks are due to FCT/MCTES for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020), through national funds. CC was supported by Fundação para a Ciência e a Tecnologia (FCT; SFRH/BPD/117746/2016).

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Correspondence to Cátia Carreira.

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Carreira, C., Talbot, S. & Lønborg, C. Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef. Biogeochemistry 154, 489–508 (2021). https://doi.org/10.1007/s10533-021-00802-x

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