Original Articles: Sources of Dissolved Organic Carbon Supporting Planktonic Bacterial Production in the Tidal Freshwater Hudson River

Ecosystems ◽  
1998 ◽  
Vol 1 (3) ◽  
pp. 227-239 ◽  
Author(s):  
Stuart Findlay ◽  
Robert L. Sinsabaugh, David T. Fischer
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Bacterial Production ◽  
Hudson River ◽  
Tidal Freshwater

Metabolism and Organic Carbon Fluxes in the Tidal Freshwater Hudson River

Estuaries ◽  
1996 ◽  
Vol 19 (4) ◽  
pp. 848 ◽  
Author(s):  
R. W. Howarth ◽  
R. Schneider ◽  
D. Swaney
Keyword(s):  
Organic Carbon ◽  
Hudson River ◽  
Carbon Fluxes ◽  
Tidal Freshwater ◽  
Organic Carbon Fluxes

Effects of clay mineral turbidity on dissolved organic carbon and bacterial production

2005 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Todd Tietjen ◽  
Anssi V. Vähätalo ◽  
Robert G. Wetzel
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Clay Mineral ◽  
Bacterial Production

scholarly journals Biologically labile photoproducts from riverine non-labile dissolved organic carbon in the coastal waters

2015 ◽  
Vol 12 (11) ◽  
pp. 8199-8234
Author(s):  
V. Kasurinen ◽  
H. Aarnos ◽  
A. Vähätalo
Keyword(s):  
Organic Carbon ◽  
Solar Radiation ◽  
Dissolved Organic Carbon ◽  
Water Samples ◽  
Bacterial Production ◽  
Growth Efficiency ◽  
Bacterial Growth Efficiency ◽  
Quantum Yields ◽  
Bacterial Respiration ◽  
Doc Flux

Abstract. In order to assess the production of biologically labile photoproducts (BLPs) from non-labile riverine dissolved organic carbon (DOC), we collected water samples from ten major rivers, removed labile DOC and mixed the residual non-labile DOC with artificial seawater for microbial and photochemical experiments. Bacteria grew on non-labile DOC with a growth efficiency of 11.5% (mean; range from 3.6 to 15.3%). Simulated solar radiation transformed a part of non-labile DOC into BLPs, which stimulated bacterial respiration and production, but did not change bacterial growth efficiency (BGE) compared to the non-irradiated dark controls. In the irradiated water samples, the amount of BLPs stimulating bacterial production depended on the photochemical bleaching of chromophoric dissolved organic matter (CDOM). The apparent quantum yields for BLPs supporting bacterial production ranged from 9.5 to 76 (mean 39) (μmol C mol photons−1) at 330 nm. The corresponding values for BLPs supporting bacterial respiration ranged from 57 to 1204 (mean 320) (μmol C mol photons−1). According to the calculations based on spectral apparent quantum yields and local solar radiation, the annual production of BLPs ranged from 21 (St. Lawrence) to 584 (Yangtze) mmol C m−2 yr−1 in the plumes of the examined rivers. Complete photobleaching of riverine CDOM in the coastal ocean was estimated to produce 10.7 Mt C BLPs yr−1 from the rivers examined in this study and globally 38 Mt yr−1 (15% of riverine DOC flux from all rivers), which support 4.1 Mt yr−1 of bacterial production and 33.9 Mt yr−1 bacterial respiration.

Effects of whole-lake manipulations of nutrient loading and food web structure on planktonic respiration

2000 ◽  
Vol 57 (2) ◽  
pp. 487-496 ◽  
Author(s):  
Michael L Pace ◽  
Jonathan J Cole
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Food Web ◽  
Bacterial Production ◽  
Nutrient Loading ◽  
Nutrient Loads ◽  
Food Web Structure ◽  
Eutrophic Lakes ◽  
Dark Bottle ◽  
Web Structure

We assessed planktonic respiration in whole-lake manipulations of nutrient loading and food web structure in three manipulated and one unmanipulated lake over 7 years. The manipulations created strong contrasts in zooplankton body size across a series of nutrient loads. Large-bodied zooplankton were suppressed by planktivorous fish in one lake, while in the other two manipulated lakes, large-bodied zooplankton dominated community biomass. Nutrients were added as inorganic N and P. Nutrient loads ranged from background to conditions resembling eutrophic lakes. Planktonic respiration was measured weekly in each lake by dark bottle oxygen consumption. Respiration was low when lakes were not fertilized (average 8.5 µmol O2·L-1·day-1) and was correlated with differences in dissolved organic carbon among the lakes. Respiration increased with nutrient addition to a mean range of 12-25 µmol O2·L-1·day-1; however, respiration differed among lakes at the same nutrient loading. Further, respiration was independent of dissolved organic carbon in the fertilized lakes. Differences in the intensity of zooplankton grazing as determined by food web structure strongly regulated primary and bacterial production across the range of nutrient loads. Consequently, respiration was positively related to primary production, phytoplankton biomass, and bacterial production and inversely related to the average size of crustacean zooplankton.

Heterotrophic bacterial production in the lower Murray River, south-eastern Australia

2005 ◽  
Vol 56 (6) ◽  
pp. 835 ◽  
Author(s):  
Gavin N. Rees ◽  
Gillian Beattie ◽  
Patricia M. Bowen ◽  
Barry T. Hart
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Particulate Organic Carbon ◽  
Chlorophyll A ◽  
Bacterial Production ◽  
Bacterial Abundance ◽  
South Eastern ◽  
Murray River ◽  
Eastern Australia ◽  
South Eastern Australia

Bacterial production is important in aquatic carbon cycles because it represents a key component whereby dissolved and particulate carbon can be recycled back into food webs. Despite its acknowledged importance, few studies have examined bacterial production in lowland rivers. Since studies have suggested bacterial production is closely related to some carbon pools, we anticipated this to be the case in the Murray River, but that the timing and type of carbon inputs in the Murray River may lead to bacterial dynamics that differ from studies from other sites. Bacterial abundance and production were measured at three contrasting sites of the lowland Murray River, south-eastern Australia, over an 18-month period. Bacterial abundance varied across the three sites on the Murray River and was correlated with chlorophyll a concentrations but not with temperature, nutrients, particulate organic carbon and dissolved organic carbon concentrations. Bacterial production also varied across the sites. Lowest production was at the site most immediately downstream of a large reservoir, with production generally ranging from 0.88 to 8.00 μg C L−1 h−1. Bacterial production in a reach within a large forest ranged from 4.00 to 17.38 μg C L−1 h−1. Production at the reach furthest downstream ranged from 1.04 to 23.50 μg C L−1 h−1. Bacterial production in the Murray River was generally greater than in the European River Spree, reaches of the Meuse and Rhine without immediate impacts from major urban centres and the Amazon River, but was similar to the concentration measured in the Mississippi and Hudson Rivers. Bacterial production was closely correlated with chlorophyll a concentration and total phosphorus, but not with temperature, dissolved organic carbon, particulate organic carbon or inorganic nitrogen. Despite the differences in production and respiration measured at different sites across the Murray River, bacterial growth efficiency was very similar at the three sites. Bacterial populations in the Murray River appear to be influenced by reach-specific conditions rather than broad-scale drivers such as temperature, carbon and nutrient concentrations.

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