Organic carbon flux in Shiraho coral reef (Ishigaki Island, Japan)

Harada, Hiroshi; Kudo, Setsuko; Yamano, Hiroya; Kurano, Norihide; Kayanne, Hajime

doi:10.3354/meps232129

Cited by 48 publications

(33 citation statements)

References 59 publications

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“…However, we are not aware of another study demonstrating consistently depleted DOC in reef environments relative to the open ocean, although recent observations indicate the potential for the phenomenon to be widespread (Suzuki et al, 2001;Dinsdale et al, 2008). Instead most studies in rapidly flushed reefs show either diel increases in DOC above offshore concentrations (Van Duyl and Gast, 2001;Hata et al, 2002) or consistently elevated concentrations of DOC (Torréton et al, 1997). Reef DOC depletion on residence timescales of hours to days is surprising and has significant biogeochemical implications because the bulk DOC pool in the surface waters of subtropical gyres (such as those surrounding Moorea) has been reported to be recalcitrant material resistant to rapid microbial degradation by surface water microbial assemblages (Carlson and Ducklow, 1996;Cherrier et al, 1996;Carlson, 2002;Carlson et al, 2004).…”

Section: Discussionmentioning

confidence: 91%

“…Corals may rapidly consume DOC and bacterioplankton (Sorokin, 1973), although many recent studies show corals to be sources, rather than sinks, for DOC (Ferrier-Pages et al, 1998;Van Duyl and Gast, 2001;Hata et al, 2002;Nakajima et al, 2009). Recent work has demonstrated the potential for sponges to consume both DOC and bacterioplankton at biogeochemically significant rates (Yahel et al, 2003;Van Duyl et al, 2006;de Goeij and Van Duyl, 2007;De Goeij et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

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Depleted dissolved organic carbon and distinct bacterial communities in the water column of a rapid-flushing coral reef ecosystem

et al. 2011

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Coral reefs are highly productive ecosystems bathed in unproductive, low-nutrient oceanic waters, where microbially dominated food webs are supported largely by bacterioplankton recycling of dissolved compounds. Despite evidence that benthic reef organisms efficiently scavenge particulate organic matter and inorganic nutrients from advected oceanic waters, our understanding of the role of bacterioplankton and dissolved organic matter (DOM) in the interaction between reefs and the surrounding ocean remains limited. In this study, we present the results of a 4-year study conducted in a well-characterized coral reef ecosystem (Paopao Bay, Moorea, French Polynesia) where changes in bacterioplankton abundance and dissolved organic carbon (DOC) concentrations were quantified and bacterial community structure variation was examined along spatial gradients of the reef:ocean interface. Our results illustrate that the reef is consistently depleted in concentrations of both DOC and bacterioplankton relative to offshore waters (averaging 79 lmol l À1 DOC and 5.5 Â 10 8 cells l À1 offshore and 68 lmol l À1 DOC and 3.1 Â 10 8 cells l À1 over the reef, respectively) across a 4-year time period. In addition, using a suite of culture-independent measures of bacterial community structure, we found consistent differentiation of reef bacterioplankton communities from those offshore or in a nearby embayment across all taxonomic levels. Reef habitats were enriched in Gamma-, Delta-, and Betaproteobacteria, Bacteriodetes, Actinobacteria and Firmicutes. Specific bacterial phylotypes, including members of the SAR11, SAR116, Flavobacteria, and Synechococcus clades, exhibited clear gradients in relative abundance among nearshore habitats. Our observations indicate that this reef system removes oceanic DOC and exerts selective pressures on bacterioplankton community structure on timescales approximating reef water residence times, observations which are notable both because fringing reefs do not exhibit long residence times (unlike those characteristic of atoll lagoons) and because oceanic DOC is generally recalcitrant to degradation by ambient microbial assemblages. Our findings thus have interesting implications for the role of oceanic DOM and bacterioplankton in the ecology and metabolism of reef ecosystems.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Depleted dissolved organic carbon and distinct bacterial communities in the water column of a rapid-flushing coral reef ecosystem

et al. 2011

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“…. G net at SIRM01 during the this study ( ), -Moorea (Gattuso et al, 1996), -Enewetak (Smith, 1973), -Shiraho (Hata et al, 2002); and -Red Sea, Eilat (Silverman et al, 2007), plotted vs. G i . In all studies the G net was measured using the alkalinity depletion method.…”

Section: Discussionmentioning

confidence: 99%

Community calcification in Lizard Island, Great Barrier Reef: A 33 year perspective

Silverman

Schneider

Kline

et al. 2014

Geochimica et Cosmochimica Acta

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Measurements of community calcification (G net)However, it should be noted that the uncertainty in the live coral coverage estimates in this study and in 1978 were fairly large and inherent to this methodology. Using the reef calcification rate equation while assuming that seawater above the reef was at equilibrium with atmospheric PCO 2 and given that live coral cover had not changed G net should have declined by 30±8% since the LIMER study as indeed observed. We note, however, that the error in estimated G net decrease relative to the 1970's could be much larger due to the uncertainties in the coral coverage measurements. Nonetheless, The similarity between the predicted and the measured decrease in G net suggests that ocean acidification may be the primary cause for the lower CaCO 3 precipitation rate on the Lizard Island reef flat.

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“…This is the first report on this difference of behaviors between DON and DOC in relation with biological processes. When considering previous works reported on organic matter contain in reef waters (Boyer et al, 1997, Van Duyl and Gast 2001, Hata et al, 2002, Wild et al, 2004 none of these studies mentioned the behavior of DOC and DON. In these studies dissolved organic matters were described using measurements of DOC, assuming that the behavior of DON is similar to DOC.…”

Section: Discussionmentioning

confidence: 99%

“…However the sources and behavior of dissolved organic nitrogen (DON) is often not well described as that of DOC in reef waters due to the limitation of available data until now. Because most of the studies described organic matter in coral reef water relation to the measurement of DOC without DON (Boyer et al, 1997, Van Duyl and Gast 2001, Hata et al, 2002, Wild et al, 2004. They thought the behavior of DON may be similar to that of DOC, therefore it is possible to calculate the concentration, flux and others from the results of DOC using DOC/DON ratio.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Dissolved Organic Matter in Coral Reef Waters in Relation with Biological Processes

Fairoz¹,

Casareto²,

Suzuki³

2011

MAS

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Behavior of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in coral reef waters in relation with biological processes was studied with incubation experiments and field observations in May 2008 and 2009 at the fringing reef of Sesoko Island, Okinawa, Japan. Reef sea water (RSW) and coral mucus added RSW collected from Acropora digitifera (AcrRSW) and Montipora digitata (MonRSW) were incubated for one day in situ and then for 77 days in the laboratory under dark condition. The results indicated that the behavior of DON was different compared to that of DOC in RSW and mucus added (AcrRSW and MonRSW) during dark incubation. Concentration of DON increased from 8. respectively. We assume that the increase of DON may be determined by difference between rates of inputs of organic matter mainly from mucus and rate of degradation of dissolved organic matter in the water column. These results suggest that recycling of DON is slow than that of DOC in coral reef ecosystem.

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Organic carbon flux in Shiraho coral reef (Ishigaki Island, Japan)

Abstract: Organic carbon flux and community production rates were estimated on Shiraho coral reef (Ishigaki Island, Japan) from 19 to 26 September 1998. The daily net community production (P n ) and respiration rate (R) during the study period were 3 to 79 and 596 mmol C m -2 d -1

Cited by 48 publications

References 59 publications

Depleted dissolved organic carbon and distinct bacterial communities in the water column of a rapid-flushing coral reef ecosystem

Depleted dissolved organic carbon and distinct bacterial communities in the water column of a rapid-flushing coral reef ecosystem

Community calcification in Lizard Island, Great Barrier Reef: A 33 year perspective

Behavior of Dissolved Organic Matter in Coral Reef Waters in Relation with Biological Processes

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