Effect of light availability on dissolved organic carbon release by Caribbean reef algae and corals

2014 ◽  
Vol 90 (3) ◽  
pp. 875-893 ◽  
Author(s):  
B Mueller ◽  
RM van der Zande ◽  
PJM van Leent ◽  
EH Meesters ◽  
MJA Vermeij ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Light Availability ◽  
Caribbean Reef ◽  
Carbon Release ◽  
Effect Of Light

scholarly journals High dissolved organic carbon release by benthic cyanobacterial mats in a Caribbean reef ecosystem

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Hannah J. Brocke ◽  
Frank Wenzhoefer ◽  
Dirk de Beer ◽  
Benjamin Mueller ◽  
Fleur C. van Duyl ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Cyanobacterial Mats ◽  
Caribbean Reef ◽  
Carbon Release ◽  
Reef Ecosystem

Rates of carbon fixation, organic carbon release and translocation in a reef-building foraminifer, Marginopora vertebralis

1977 ◽  
Vol 28 (3) ◽  
pp. 311 ◽  
Author(s):  
DF Smith ◽  
WJ Wiebe
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Particulate Organic Carbon ◽  
Carbon Fixation ◽  
Turnover Time ◽  
In Situ Incubation ◽  
Carbon Release ◽  
Hermatypic Corals ◽  
Shell Carbonate

Rate measurements obtained in this study and the population densities of foraminifera reported elsewhere suggest that such organisms may well exceed the hermatypic corals in their contribution to reef biogensis and energy fluxes. The average rates at which M. vertebralis photosynthetically fixes carbon into particulate organic carbon, dissolved organic carbon, and shell carbonate, per square centimetre of organism, were estimated to be 50, 1 .5, and 26 ng C min-1 respectively. Exogenously supplied dissolved organic carbon was taken up by M. vertebralis at a rate of 0.05 ng C min-1 in the light, and 0.09 ng C min-1 in the dark per square centimetre of organism. The turnover time of particulate organic carbon (91 h) was measured in a long-term in situ incubation during which 19% of the radioactivity lost from the particulate organic carbon entered the calcareous foraminiferal shell.

scholarly journals Trade-offs Between Light and Nutrient Availability Across Gradients of Dissolved Organic Carbon Lead to Spatially and Temporally Variable Responses of Lake Phytoplankton Biomass to Browning

Ecosystems ◽  
2021 ◽  
Author(s):  
Peter D. F. Isles ◽  
Irena F. Creed ◽  
Anders Jonsson ◽  
Ann-Kristin Bergström
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Nutrient Availability ◽  
Phytoplankton Biomass ◽  
Light Availability ◽  
Nutrient Stoichiometry ◽  
Spatial Gradients ◽  
Trade Offs ◽  
Lower Light ◽  
The Relationship

AbstractNorthern lakes are experiencing widespread increases in dissolved organic carbon (DOC) that are likely to lead to changes in pelagic phytoplankton biomass. Pelagic phytoplankton biomass responds to trade-offs between light and nutrient availability. However, the influence of DOC light absorbing properties and carbon–nutrient stoichiometry on phytoplankton biomass across seasonal or spatial gradients has not been assessed. Here, we analyzed data from almost 5000 lakes to examine how the carbon–phytoplankton biomass relationship is influenced by seasonal changes in light availability, DOC light absorbing properties (carbon-specific visual absorbance, SVA420), and DOC–nutrient [total nitrogen (TN) and total phosphorus (TP)] stoichiometry, using TOC as a proxy for DOC. We found evidence for trade-offs between light and nutrient availability in the relationship between DOC and phytoplankton biomass [chlorophyll (chl)-a], with the shape of the relationship varying with season. A clear unimodal relationship was found only in the fall, particularly in the subsets of lakes with the highest TOC:TP. Observed trends of increasing TOC:TP and decreasing TOC:TN suggest that the effects of future browning will be contingent on future changes in carbon–nutrient stoichiometry. If browning continues, phytoplankton biomass will likely increase in most northern lakes, with increases of up to 76% for a 1.7 mg L−1 increase in DOC expected in subarctic regions, where DOC, SVA420, DOC:TN, and DOC:TP are all low. In boreal regions with higher DOC and higher SVA420, and thus lower light availability, lakes may experience only moderate increases or even decreases in phytoplankton biomass with future browning.

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