Dynamics of planktonic prokaryotes and dissolved carbon in a subtropical coastal lake

Fontes, MLS; Tonetta, D; Dalpaz, L; Antônio, RV; Petrucio, MM

Dynamics of planktonic prokaryotes and dissolved carbon in a subtropical coastal lake

Fontes, MLS Tonetta, D Dalpaz, L Antônio, RV Petrucio, MM

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Publication Type:: Journal Article
Citation:: Frontiers in Microbiology, 2013, 4 (APR)
Issue Date:: 2013-01-01

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Field	Value	Language
dc.contributor.author	Fontes, MLS	en_US
dc.contributor.author	Tonetta, D	en_US
dc.contributor.author	Dalpaz, L	en_US
dc.contributor.author	Antônio, RV	en_US
dc.contributor.author	Petrucio, MM	en_US
dc.date.available	2013-03-13	en_US
dc.date.issued	2013-01-01	en_US
dc.identifier.citation	Frontiers in Microbiology, 2013, 4 (APR)	en_US
dc.identifier.uri	http://hdl.handle.net/10453/118008
dc.description.abstract	To understand the dynamics of planktonic prokaryotes in a subtropical lake and its relationship with carbon, we conducted water sampling through four 48-h periods in Peri Lake for 1 year. Planktonic prokaryotes were characterized by the abundance and biomass of heterotrophic bacteria (HB) and of cyanobacteria (coccoid and filamentous cells). During all samplings, we measured wind speed, water temperature (WT), pH, dissolved oxygen (DO), precipitation, dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and carbon dioxide (CO2). DOC was higher in the summer (average = 465 μM - WT = 27°C) and lower in the winter (average = 235 μM - WT = 17°C), with no significant variability throughout the daily cycles. CO2 concentrations presented a different pattern, with a minimum in the warm waters of the summer period (8.31 μM) and a maximum in the spring (37.13 μM). Daily trends were observed for pH, DO, WT, and CO2. At an annual scale, both biological and physical-chemical controls were important regulators of CO2. HB abundance and biomass were higher in the winter sampling (5.60 × 109 cells L-1 and 20.83 μmol C L-1) and lower in the summer (1.87 × 109 cells L-1 and 3.95 μmol C L-1). Filamentous cyanobacteria (0.23 × 108-0.68 × 108 filaments L-1) produced up to 167.16 μmol C L-1 as biomass (during the warmer period), whereas coccoid cyanobacteria contributed only 0.38 μmol C L-1. Precipitation, temperature, and the biomass of HB were the main regulators of CO2 concentrations. Temperature had a negative effect on the concentration of CO2, which may be indirectly attributed to high heterotroph activity in the autumn and winter periods. DOC was positively correlated with the abundance of total cyanobacteria and negatively with HB. Thus, planktonic prokaryotes have played an important role in the dynamics of both dissolved inorganic and organic carbon in the lake. © 2013 Fontes, Tonetta, Dalpaz, Antônio and Petrucio.	en_US
dc.relation.ispartof	Frontiers in Microbiology	en_US
dc.relation.isbasedon	10.3389/fmicb.2013.00071	en_US
dc.title	Dynamics of planktonic prokaryotes and dissolved carbon in a subtropical coastal lake	en_US
dc.type	Journal Article
utslib.citation.volume	APR	en_US
utslib.citation.volume	4	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0503 Soil Sciences	en_US
utslib.for	0605 Microbiology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	open_access
pubs.issue	APR	en_US
pubs.publication-status	Published	en_US
pubs.volume	4	en_US

Abstract:

To understand the dynamics of planktonic prokaryotes in a subtropical lake and its relationship with carbon, we conducted water sampling through four 48-h periods in Peri Lake for 1 year. Planktonic prokaryotes were characterized by the abundance and biomass of heterotrophic bacteria (HB) and of cyanobacteria (coccoid and filamentous cells). During all samplings, we measured wind speed, water temperature (WT), pH, dissolved oxygen (DO), precipitation, dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and carbon dioxide (CO2). DOC was higher in the summer (average = 465 μM - WT = 27°C) and lower in the winter (average = 235 μM - WT = 17°C), with no significant variability throughout the daily cycles. CO2 concentrations presented a different pattern, with a minimum in the warm waters of the summer period (8.31 μM) and a maximum in the spring (37.13 μM). Daily trends were observed for pH, DO, WT, and CO2. At an annual scale, both biological and physical-chemical controls were important regulators of CO2. HB abundance and biomass were higher in the winter sampling (5.60 × 109 cells L-1 and 20.83 μmol C L-1) and lower in the summer (1.87 × 109 cells L-1 and 3.95 μmol C L-1). Filamentous cyanobacteria (0.23 × 108-0.68 × 108 filaments L-1) produced up to 167.16 μmol C L-1 as biomass (during the warmer period), whereas coccoid cyanobacteria contributed only 0.38 μmol C L-1. Precipitation, temperature, and the biomass of HB were the main regulators of CO2 concentrations. Temperature had a negative effect on the concentration of CO2, which may be indirectly attributed to high heterotroph activity in the autumn and winter periods. DOC was positively correlated with the abundance of total cyanobacteria and negatively with HB. Thus, planktonic prokaryotes have played an important role in the dynamics of both dissolved inorganic and organic carbon in the lake. © 2013 Fontes, Tonetta, Dalpaz, Antônio and Petrucio.

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http://hdl.handle.net/10453/118008