Correspondence between the distribution of hydrodynamic time parameters and the distribution of biological and chemical variables in a semi-enclosed coral reef lagoon

Torréton, Jean-Pascal; Rochelle-Newall, Emma; Jouon, Aymeric; Faure, Vincent; Jacquet, Séverine; Douillet, Pascal

doi:10.1016/j.ecss.2007.05.018

Cited by 66 publications

(50 citation statements)

References 33 publications

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“…The difference between offshore and backreef DOC and bacterioplankton concentrations is significantly less when wave energy was greatest in the Austral summer ( Figure 3, Hench et al, 2008) and wave energy flux (the product of the square of significant wave height and the wave period averaged over the 24 h before sampling) was a strong and significant predictor of backreef DOC and bacterioplankton proportional depletion (backreef:offshore) among sampling dates 2005-2009 (DOC: n ¼ 7, r 2 ¼ 0.63, P ¼ 0.032; Bacterioplankton: n ¼ 9, r 2 ¼ 0.66, P ¼ 0.008). In addition, the potential for water exiting the reef passes to be retained and recycled back across the reef crest (Hench et al, 2008) has the potential to increase the practical reef residence time of water beyond estimates based solely on flushing rates or control volumes (Lenhardt, 1991;Delesalle and Sournia, 1992;Reidenbach et al, 2002;Torréton et al, 2007), thus increasing contact time with reef heterotrophic organisms.…”

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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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: 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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“…Previous research on pigments in New Caledonian waters concerned mainly the south west lagoon (SWL, Figure 1) and was limited to bulk chl a concentration distribution and variations [3][4][5][6][7][8][9][10]. Early work reported increasing Tchl a concentration from the ocean through the coastal lagoon to the estuaries with maxima found after flooding and in urban effluent areas [3].…”

Section: Introductionmentioning

confidence: 99%

Chlorophylls and Phycoerythrins as Markers of Environmental Forcings Including Cyclone Erica Effect (March 2003) on Phytoplankton in the Southwest Lagoon of New Caledonia and Oceanic Adjacent Area

Neveux

Tenório

Jacquet

et al. 2009

International Journal of Oceanography

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Recommended by Robert FrouinSpatio-temporal variations of chlorophylls and phycoerythrins, inferred by spectrofluorometric methods, were studied from April 2002 to June 2003 in the southwest lagoon and oceanic waters of New Caledonia. Trade winds blew 75% of the time and appeared as the main factor influencing surface Tchla (sum of monovinyl-and divinyl-chlorophyll a) variations in the ocean, near the barrier reef. Lagoon and oceanic waters differed in the composition of picoplanktonic cyanobacteria with a relative dominance of Prochlorococcus and high-phycourobilin Synechococcus in the ocean, and a relative dominance of high-phycoerythrobilin Synechococcus in the lagoon. Main pigment variations in the lagoon were associated with cyclone Erica in March 2003 and showed a 5-6 fold Tchla increase around Nouméa. The cyclone stimulated mainly diatom growth as indicated by the high chlorophyll (c 1 + c 2 )/chlorophyll a ratio and by the lowest values for the other pigment ratios. The relative importance of divinyl-chlorophyll a concentration and fluorescence excitation spectra of phycoerythrins appeared as useful tools for characterizing lagoon-ocean exchanges.

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“…Correlations between biological and chemical data and hydrological time parameters are shown by many authors [5,[15][16][17], even if few studies focus on harbour areas [2,18]. Montero et al [18] showed that the metal contamination gradient is in accordance with the residence time calculated within the Pasaia harbour (Spain) and along the channel of the estuary.…”

Section: Introductionmentioning

confidence: 70%

“…The water circulation within lagoons, lakes and semi-enclosed areas (e.g. harbours) is analysed by many authors through the use of hydrodynamical models [3][4][5][6][7]. The model results are then used to calculate the hydrodynamic time parameters (age, flushing time (FT), residence time, transit time and turnover time) that are considered synthetic indicators to relate the dynamic processes with contaminant distribution in marine environment and consequently with the health status of aquatic ecosystems [3].…”

Section: Introductionmentioning

confidence: 99%

Water renewal time and trace metal concentration in civitavecchia port (rome), italy

Bonamano¹,

Piazzolla²,

Madonia³

et al. 2018

Int. J. EI

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Most of the harbours can be considered as semi-enclosed areas where water stagnation leads to physical and chemical alterations due to anthropogenic activities. These features affect the quality of the port waters as well as the environmental health of coastal ecosystems in the surrounding areas. In order to understand the potential degradation of water quality within the harbour area it is essential to evaluate the hydrodynamic behaviour of the system. In this study, the DELFT3D-FLOW model, which allows to estimate the three-dimensional field velocity, was used to spatially characterize the water renewal time within the harbour. In particular, the flushing time (FT), which represents the time required for the total mass of a conservative tracer originally within the water body to be reduced to a factor 1/e, was examined. The concentration of contaminants in sediments is indeed a proper parameter to test the reliability of the calculated water renewal time within the semi-enclosed basins, since it relies on time-integrated measurements compared to single observations of water column. This research aims at studying the relation between the FT and the pollution due to trace metals in marine sediments. For this purpose, surface sediment samples were collected along a series of stations located in the innermost part and near the mouth of the Civitavecchia harbour. As, Cr, Hg, Ni, Cu, zn, Pb and Al concentrations were analysed to calculate the enrichment factor, which provides an estimate of the heavy metal contamination in the harbour surface sediment. The obtained results show a high correlation between the FT and the enrichment factor within the Civitavecchia port, confirming that water renewal can be used as an indicator of water quality degradation in semi-enclosed areas.

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Correspondence between the distribution of hydrodynamic time parameters and the distribution of biological and chemical variables in a semi-enclosed coral reef lagoon

Cited by 66 publications

References 33 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

Chlorophylls and Phycoerythrins as Markers of Environmental Forcings Including Cyclone Erica Effect (March 2003) on Phytoplankton in the Southwest Lagoon of New Caledonia and Oceanic Adjacent Area

Water renewal time and trace metal concentration in civitavecchia port (rome), italy

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