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Dissolved Organic Carbon Source Influences Tropical Coastal Heterotrophic Bacterioplankton Response to Experimental Warming

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dc.contributor King Abdullah Univ Sci & Technol
dc.contributor Univ Otago
dc.contributor Dept Limnol & Biooceanog
dc.contributor University of Otago
dc.contributor University of Vienna
dc.contributor Australian Institute of Marine Science
dc.contributor Dept Marine Sci
dc.contributor Red Sea Res Ctr
dc.contributor Univ Aveiro
dc.contributor Universidade de Aveiro
dc.contributor Australian Inst Marine Sci
dc.contributor King Abdullah University of Science & Technology
dc.contributor Univ Vienna
dc.contributor CESAM
dc.contributor Dept Biol Moran, Xose Anxelu G. Baltar, Federico Carreira, Catia Lonborg, Christian 2020-01-05T18:57:05Z 2020-01-16T06:14:54Z 2020-01-05T18:57:05Z 2020-01-16T06:14:54Z 2019-12-05
dc.identifier.citation Lonborg C, Baltar F, Carreira C, Moran XAG (2019) Dissolved organic carbon source influences tropical coastal heterotrophic bacterioplankton response to experimental warming. Frontiers in Microbiology 10: 2807
dc.identifier.issn 1664-302X
dc.description.abstract Global change impacts on marine biogeochemistry will be partly mediated by heterotrophic bacteria. Besides ocean warming, future environmental changes have been suggested to affect the quantity and quality of organic matter available for bacterial growth. However, it is yet to be determined in what way warming and changing substrate conditions will impact marine heterotrophic bacteria activity. Using short-term (4 days) experiments conducted at three temperatures (-3 degrees C, in situ, +3 degrees C) we assessed the temperature dependence of bacterial cycling of marine surface water used as a control and three different dissolved organic carbon (DOC) substrates (glucose, seagrass, and mangrove) in tropical coastal waters of the Great Barrier Reef, Australia. Our study shows that DOC source had the largest effect on the measured bacterial response, but this response was amplified by increasing temperature. We specifically demonstrate that (1) extracellular enzymatic activity and DOC consumption increased with warming, (2) this enhanced DOC consumption did not result in increased biomass production, since the increases in respiration were larger than for bacterial growth with warming, and (3) different DOC bioavailability affected the magnitude of the microbial community response to warming. We suggest that in coastal tropical waters, the magnitude of heterotrophic bacterial productivity and enzyme activity response to warming will depend partly on the DOC source bioavailability.
dc.description.sponsorship This study was co-financed by the AIMS visiting fellowship program to XM as part of the capability development fund (CDF). FB was supported by a University of Otago Research Grant. Thanks are due for the financial support to CESAM (UID/AMB/50017-POCI-01-0145-FEDER-007638), to FCT/MCTES through national funds (PIDDAC), and the co-funding by the FEDER, within the PT2020 Partnership Agreement and Compete 2020. CC was supported by the Foundation for Science and Technology (SFRH/BPD/117746/2016).
dc.language English
dc.subject temperature
dc.subject microbial carbon cycling
dc.subject TEMPERATURE
dc.subject DYNAMICS
dc.subject extracellular enzymatic activity
dc.subject Great Barrier Reef
dc.subject RESPIRATION
dc.subject OCEAN
dc.subject dissolved organic carbon
dc.subject MATTER
dc.subject tropical coastal waters
dc.subject Microbiology
dc.title Dissolved Organic Carbon Source Influences Tropical Coastal Heterotrophic Bacterioplankton Response to Experimental Warming
dc.type journal article
dc.identifier.doi 10.3389/fmicb.2019.02807
dc.identifier.wos WOS:000503499400001

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