Bacterial consumption of total and dissolved organic carbon in the Great Barrier Reef

2021 ◽  
Author(s):  
Cátia Carreira ◽  
Sam Talbot ◽  
Christian Lønborg
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Great Barrier Reef ◽  
Barrier Reef

scholarly journals Small-scale distribution of microbes and biogeochemistry in the Great Barrier Reef

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e10049
Author(s):  
Cátia Carreira ◽  
Júlia Porto Silva Carvalho ◽  
Samantha Talbot ◽  
Isabel Pereira ◽  
Christian Lønborg
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Great Barrier Reef ◽  
Temporal Distribution ◽  
Small Scale ◽  
Barrier Reef ◽  
Dissolved Nitrogen ◽  
Total Dissolved Nitrogen ◽  
Dissolved Inorganic Nutrients ◽  
Small Scales

Microbial communities distribute heterogeneously at small-scales (mm-cm) due to physical, chemical and biological processes. To understand microbial processes and functions it is necessary to appreciate microbes and matter at small scales, however, few studies have determined microbial, viral, and biogeochemical distribution over space and time at these scales. In this study, the small-scale spatial and temporal distribution of microbes (bacteria and chlorophyll a), viruses, dissolved inorganic nutrients and dissolved organic carbon were determined at five locations (spatial) along the Great Barrier Reef (Australia), and over 4 consecutive days (temporal) at a coastal location. Our results show that: (1) the parameters show high small-scale heterogeneity; (2) none of the parameters measured explained the bacterial abundance distributions at these scales spatially or temporally; (3) chemical (ammonium, nitrate/nitrite, phosphate, dissolved organic carbon, and total dissolved nitrogen) and biological (chl a, and bacterial and viral abundances) measurements did not reveal significant relationships at the small scale; and (4) statistically significant differences were found between sites/days for all parameter measured but without a clear pattern.

Light and Dark Respiration and Release of Organic Carbon in Marine Macrophytes of the Great Barrier Reef Region

1976 ◽  
Vol 3 (1) ◽  
pp. 63 ◽  
Author(s):  
RA Hough
Keyword(s):  
Organic Carbon ◽  
Dissolved Oxygen ◽  
Great Barrier Reef ◽  
Vascular Plants ◽  
Dark Respiration ◽  
Marine Macroalgae ◽  
Barrier Reef ◽  
Marine Macrophytes ◽  
Carbon Release ◽  
Cymodocea Rotundata

Respiration and organic carbon release were examined in several submersed marine macroalgae and vascular plants of the Great Barrier Reef region by use of a 14C assay. Loss of 14CO2 and organic 14C from prelabelled plants was followed in the light and dark at low and high dissolved oxygen concentrations. While refixation of respired carbon in the light was substantial in some cases, rates of loss of CO2 in the light were significant and suggested presence of photorespiration, particularly in Cymodocea rotundata and Halophila ovata, in which respiration in the light was enhanced by high dissolved oxygen concentration. Release of dissolved organic carbon was relatively low, and lack of enhancement by high oxygen suggested minimal involvement of glycollate excretion.

Feeding of Holothuria atra and Stichopus chloronotus on bacteria, organic carbon and organic nitrogen in sediments of the Great Barrier Reef

1982 ◽  
Vol 33 (2) ◽  
pp. 255 ◽  
Author(s):  
DJW Moriarty
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Great Barrier Reef ◽  
Organic Nitrogen ◽  
Bacterial Biomass ◽  
Gut Contents ◽  
Barrier Reef ◽  
Muramic Acid ◽  
Blue Green Algae ◽  
Carbon And Nitrogen

Organic carbon and nitrogen and bacterial biomass were measured in the sediments and gut contents of H. atra and S. chloronotuson the Great Barrier Reef. Organic carbon averaged from 3.4 to 4.7 mg g-1, organic nitrogen from 0.20 to 0.31 mg g-1 and muramic acid from 1.4 to 3.3�g g-1 dry weight of surface sandy sediments. Bacterial biomass, determined by muramic acid measurements, averaged 3-8% of organic carbon in the sediments; blue-green algae accounted for 3-7% of muramic acid. Significantly higher values of organic carbon and nitrogen and muramic acid were found in foregut contents of the holothurians, indicating selective feeding on organically rich components of the sediment. Carbon values were 16-34% higher in the foregut than in the sediment. nitrogen values 35-111% higher and muramic acid values 33-300% higher. These values indicate that bacteria and nitrogenous components of the organic matter were selectively eaten. Values for organic carbon and nitrogen and muramic acid were generally lower in the hindgut than in the foregut, due to digestion and assimilation. Assimilation efficiencies averaged 30% for organic carbon, 40% for organic nitrogen and 30-40% for muramic acid (bacteria). Detritus (non-living matter) probably constituted 60-80% of the organic matter in the sediment and thus the food of the holothurians.

scholarly journals The Physiological Response of Two Green Calcifying Algae from the Great Barrier Reef towards High Dissolved Inorganic and Organic Carbon (DIC and DOC) Availability

PLoS ONE ◽  
2015 ◽  
Vol 10 (8) ◽  
pp. e0133596 ◽  
Author(s):  
Friedrich Wilhelm Meyer ◽  
Nikolas Vogel ◽  
Mirta Teichberg ◽  
Sven Uthicke ◽  
Christian Wild
Keyword(s):  
Organic Carbon ◽  
Great Barrier Reef ◽  
Physiological Response ◽  
Barrier Reef ◽  
Inorganic And Organic

scholarly journals Effects of High Dissolved Inorganic and Organic Carbon Availability on the Physiology of the Hard Coral Acropora millepora from the Great Barrier Reef

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0149598 ◽  
Author(s):  
Friedrich W. Meyer ◽  
Nikolas Vogel ◽  
Karen Diele ◽  
Andreas Kunzmann ◽  
Sven Uthicke ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Great Barrier Reef ◽  
Barrier Reef ◽  
Hard Coral ◽  
Acropora Millepora ◽  
Carbon Availability ◽  
Inorganic And Organic
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