气候变化领域集成服务门户(CCPortal): Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef

CCPortal

DOI	10.1007/s10533-021-00802-x
	Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef
	Carreira C.; Talbot S.; Lønborg C.
发表日期	2021
ISSN	1682563
起始页码	489
结束页码	508
卷号	154 期号:3
英文摘要	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. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Dissolved organic carbon; Great Barrier Reef; Heterotrophic bacteria; Organic carbon cycling; Total organic carbon; Tropical coastal waters
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184579
作者单位	ECOMARE, CESAM-The Centre for Environmental and Marine Studies, University of Aveiro, Campus de Santiago, Aveiro, Portugal; Department of Environmental Science, Aarhus University, Roskilde, 4000, Denmark; Australian Institute of Marine Science, PMB No 3, Townsville, QLD, Australia; Section for Applied Marine Ecology and Modelling, Department of Bioscience, Aarhus University, Aarhus, Denmark
推荐引用方式 GB/T 7714	Carreira C.,Talbot S.,Lønborg C.. Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef[J],2021,154(3).
APA	Carreira C.,Talbot S.,&Lønborg C..(2021).Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef.Biogeochemistry,154(3).
MLA	Carreira C.,et al."Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef".Biogeochemistry 154.3(2021).