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

Publikation: KonferencebidragPosterFormidling

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. 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 (TOC) and dissolved organic carbon (DOC) simultaneously. Therefore, in this study we followed dissolved and total organic carbon cycling over 12 days dark incubations. The study was performed at three sites along the middle stretch of the Great Barrier Reef (Australia) 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. However, 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 the GBR is a heterotrophic system.
Udgivelsesår25 jun. 2021
StatusUdgivet - 25 jun. 2021
BegivenhedASLO 2021 Aquatic Sciences Meeting - Virtual Meeting
Varighed: 22 jun. 202127 jun. 2021


KonferenceASLO 2021 Aquatic Sciences Meeting
LokationVirtual Meeting

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