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Seasonal organic matter dynamics in the Great Barrier Reef lagoon: Contribution of carbohydrates and proteins

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dc.contributor Sch Math & Phys
dc.contributor University Of Queensland
dc.contributor Univ Queensland
dc.contributor Australian Inst Marine Sci
dc.contributor Australian Institute Of Marine Science CARREIRA, CATIA LONBORG, CHRISTIAN DOYLE, JASON FURNAS, MILES MENENDEZ, PATRICIA BENTHUYSEN, JESSICA A. 2017-07-20T22:23:07Z 2017-07-20T22:23:07Z 2019-05-09T01:19:23Z 2017-07-20T22:23:07Z 2017-07-20T22:23:07Z 2019-05-09T01:19:23Z 2017-04-15
dc.identifier.citation Lonborg C, Doyle J, Furnas M, Menendez P, Benthuysen JA, Carreira C (2017) Seasonal organic matter dynamics in the Great Barrier Reef lagoon: contribution of carbohydrates and proteins. Continental Shelf Research 138: 95-105
dc.identifier.issn 0278-4343
dc.description.abstract Organic matter (OM) plays a fundamental role in sustaining the high productivity of coral reef ecosystems. Carbohydrates and proteins constitute two of the major chemical classes identified in the OM pool and are used as indicators of bioavailability due to their fast turn-over. We conducted three cruises across the southern shelf of the Great Barrier Reef (GBR) during the early dry, late dry and wet seasons in 2009-2010 to 1) assess the relative bioavailability of particulate (POM) and dissolved (DOM) organic matter, 2) track the temporal and spatial variability in the carbohydrate and protein contribution to the OM pool, and 3) assess factors influencing protein and carbohydrate fractions of the OM pool. Generally, higher concentrations of particulate carbohydrates were found during the wet season, while similar concentrations of particulate protein were found during the three seasons. Both the dissolved carbohydrates and proteins had highest levels during the early dry season and lowest during the wet season, suggesting seasonal variations in the chemical composition of the DOM pool. Spatially, carbohydrates showed higher concentrations at the inshore stations, while no clear spatial pattern was found for the protein concentrations. On average carbohydrates and proteins accounted for a similar fraction (13 +/- 5 and 12 +/- 6% respectively) of POM, while carbohydrates accounted for a smaller fraction of the DOM than the proteins (6 3 and 13 +/- 10%). This suggests that the POM bioavailability was similar between seasons, while the DOM bioavailability varied seasonally with highest levels during the early dry season. This demonstrates that carbohydrates and proteins in the GBR have temporal and spatial variations. Our statistical analysis showed that 1) both carbohydrates and proteins were related with the POM and DOM C:N:P stoichiometry, demonstrating that both bulk estimates (stoichiometry) and specific compounds (CHO and Prot) provide useful measures of OM bioavailability in the GBR and 2) the carbohydrates and proteins levels were controlled by the amount of nutrients and POM, which in this system is mainly of plankton origin. Overall this study shows that the POM and DOM pools contain highly bioavailable compounds and that carbohydrate and proteins could play an important role in sustaining the productivity of the GBR.
dc.description.sponsorship Financial support was provided by the Australian Institute of Marine Science. We thank the crew of the R.V. Cape Ferguson for help at sea. The authors are grateful to the anonymous reviewers who provided valuable comments on the manuscript.
dc.language English
dc.subject Phytoplankton
dc.subject Proteins
dc.subject Tropical
dc.subject Chemical-composition
dc.subject Bacterial-degradation
dc.subject Oceanography
dc.subject Particulate Organic Matter
dc.subject Dissolved Organic Matter
dc.subject Submicron Particles
dc.subject Seawater
dc.subject Marine
dc.subject Carbon
dc.subject Carbohydrates
dc.subject Great Barrier Reef
dc.subject Nitrogen
dc.subject Waters
dc.subject Arctic-ocean
dc.title Seasonal organic matter dynamics in the Great Barrier Reef lagoon: Contribution of carbohydrates and proteins
dc.type journal article
dc.identifier.doi 10.1016/j.csr.2017.01.010
dc.identifier.wos WOS:000401202000008

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