Serveur d'exploration sur les relations entre la France et l'Australie

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Seasonal coupling and de‐coupling of net calcification rates from coral reef metabolism and carbonate chemistry at Ningaloo Reef, Western Australia

Identifieur interne : 005602 ( Main/Exploration ); précédent : 005601; suivant : 005603

Seasonal coupling and de‐coupling of net calcification rates from coral reef metabolism and carbonate chemistry at Ningaloo Reef, Western Australia

Auteurs : James L. Falter [Australie] ; Ryan J. Lowe [Australie] ; Marlin J. Atkinson [États-Unis] ; Pascale Cuet [France]

Source :

RBID : ISTEX:40B4BEE0DCA8A3BF6A5DF92BB32CD1634BB99E2F

Descripteurs français

English descriptors

Abstract

Rates of net production, net calcification, and nutrient uptake were measured in a coral‐dominated reef flat community on Ningaloo Reef in northwestern Australia under seasonally minimum and maximum light levels. Daily integrated light decreased twofold while water temperatures remained relatively constant increasing by only 1°C on average from summer to winter. Rates of daily community gross primary production (GPP) were only 33% ± 9% higher in summer than in winter (1400 ± 70 versus 1050 ± 60 mmol C m−2 d−1), far less than the twofold seasonal changes reported for most shallow reef communities. Rates of daily community net calcification (Gnet) were not significantly different between seasons (190 ± 40 mmol CaCO3 m−2 d−1 in summer versus 200 ± 10 mmol CaCO3 m−2 d−1 in winter). The average rate of total nitrogen uptake (dissolved + particulate) was also not significantly different between summer and winter (8.3 ± 3.8 versus 6.6 ± 3.4 mmol N m−2 d−1, respectively), despite evidence of sporadically high nitrate uptake in both seasons. In summer, rates of hourly net calcification (gnet) were linearly correlated with diurnal changes in net production, pH, and aragonite saturation state (Ωar); and were mostly correlated with light except at mid‐day under heavy cloud cover. However, in winter,gnet was independent of diurnal changes in light, net production, pH, and Ωar indicating that the reef flat community had possibly reached a threshold above which rates of net calcification were insensitive to diurnal changes in their environment.

Url:
DOI: 10.1029/2011JC007268


Affiliations:


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Le document en format XML

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<term>Acidification</term>
<term>Active filter feeders</term>
<term>Advection term</term>
<term>Alkalinity</term>
<term>Ambient carbonate chemistry</term>
<term>Aragonite</term>
<term>Aragonite saturation state</term>
<term>Atkinson</term>
<term>Benthic oxygen fluxes</term>
<term>Biogeochemical parameters</term>
<term>Biogeochemical variables</term>
<term>Biol</term>
<term>Caco3</term>
<term>Calcification</term>
<term>Calcification rate</term>
<term>Calcification rates</term>
<term>Carbon metabolism</term>
<term>Carbonate</term>
<term>Carbonate chemistry</term>
<term>Carbonic acid</term>
<term>Cloudless days</term>
<term>Community calcification rates</term>
<term>Community dissolution</term>
<term>Community metabolism</term>
<term>Community photosynthesis</term>
<term>Community respiration</term>
<term>Concentration scale</term>
<term>Constant light</term>
<term>Continuous measurements</term>
<term>Control volume</term>
<term>Coral</term>
<term>Coral acropora cervicornis</term>
<term>Coral calcification</term>
<term>Coral growth</term>
<term>Coral reef</term>
<term>Coral reef communities</term>
<term>Coral reef metabolism</term>
<term>Coral reef studies</term>
<term>Coral reefs</term>
<term>Cuet</term>
<term>Current directions</term>
<term>Daily community</term>
<term>Daily community respiration</term>
<term>Dickson</term>
<term>Diurnal changes</term>
<term>Diurnal variations</term>
<term>Ecol</term>
<term>Error bars</term>
<term>Eulerian approach</term>
<term>French polynesia</term>
<term>Fringing reef</term>
<term>Galaxea fascicularis</term>
<term>Gattuso</term>
<term>Geophys</term>
<term>Gnet</term>
<term>Gnet jno3</term>
<term>Great barrier reef</term>
<term>Gross calcification</term>
<term>Gross photosynthesis</term>
<term>Gross rates</term>
<term>Hawaii institute</term>
<term>Heavy cloud</term>
<term>Heterotrophic bacteria</term>
<term>High rates</term>
<term>Higher rates</term>
<term>Hourly</term>
<term>Hourly rates</term>
<term>Incident light</term>
<term>Indian ocean</term>
<term>Influence rates</term>
<term>Inorganic carbon</term>
<term>Kinsey</term>
<term>Late winter</term>
<term>Light incident</term>
<term>Light levels</term>
<term>Light sensor</term>
<term>Limnol</term>
<term>Marine biology</term>
<term>Mass transfer limitation</term>
<term>Metabolic rates</term>
<term>Metabolism</term>
<term>Mmol</term>
<term>Mmol caco3</term>
<term>Mmol mmol</term>
<term>Mmol mmol matm mmol</term>
<term>Mmol quanta</term>
<term>Monte carlo approach</term>
<term>Natural reef communities</term>
<term>Nighttime gnet</term>
<term>Nighttime rates</term>
<term>Ningaloo</term>
<term>Ningaloo reef</term>
<term>Nitrate</term>
<term>Nitrate concentrations</term>
<term>Nitrate phosphate</term>
<term>Nitrogen uptake</term>
<term>Nonlinear regressions</term>
<term>Nutrient</term>
<term>Nutrient enrichment</term>
<term>Nutrient uptake</term>
<term>Nutrient uptake rates</term>
<term>Ocean acidification</term>
<term>Oceanogr</term>
<term>Open circles</term>
<term>Organic carbon production</term>
<term>Other variables</term>
<term>Oxygen concentration</term>
<term>Oxygen time series</term>
<term>Pco2</term>
<term>Perfect relationship</term>
<term>Photosynthesis</term>
<term>Photosynthetic</term>
<term>Photosynthetic energy</term>
<term>Photosynthetic quotient</term>
<term>Physical chemical</term>
<term>Present reef</term>
<term>Present reef community</term>
<term>Present study</term>
<term>Primary production</term>
<term>Reef</term>
<term>Reef calcification</term>
<term>Reef calcification figure</term>
<term>Reef communities</term>
<term>Reef community</term>
<term>Reef crest</term>
<term>Reef systems</term>
<term>Reef transport</term>
<term>Respiration</term>
<term>Salinity</term>
<term>Same reef</term>
<term>Same time</term>
<term>Seasonal changes</term>
<term>Seasonal differences</term>
<term>Seaward location</term>
<term>Seawater</term>
<term>Seawater acidification</term>
<term>Shallow reef communities</term>
<term>Shallow reef environments</term>
<term>Silverman</term>
<term>Similar latitudes</term>
<term>Similar water temperatures</term>
<term>Solid lines</term>
<term>Square difference</term>
<term>Study area</term>
<term>Study period</term>
<term>Study periods</term>
<term>Study site</term>
<term>Stylophora pistillata</term>
<term>Surface waters</term>
<term>Survey period</term>
<term>Synthetic seawater</term>
<term>Time scales</term>
<term>Total alkalinity</term>
<term>Total hydrogen</term>
<term>Total nitrogen uptake</term>
<term>Transit time</term>
<term>Uptake</term>
<term>Volume transport</term>
<term>Water chemistry</term>
<term>Water column</term>
<term>Water motion</term>
<term>Water samples</term>
<term>Water temperature</term>
<term>Water temperatures</term>
<term>Waters incident</term>
<term>Wave heights</term>
<term>West cape</term>
<term>West coast</term>
<term>Western australia</term>
<term>Winkler titration</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en">
<term>Acidification</term>
<term>Active filter feeders</term>
<term>Advection term</term>
<term>Alkalinity</term>
<term>Ambient carbonate chemistry</term>
<term>Aragonite</term>
<term>Aragonite saturation state</term>
<term>Atkinson</term>
<term>Benthic oxygen fluxes</term>
<term>Biogeochemical parameters</term>
<term>Biogeochemical variables</term>
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<term>Calcification rates</term>
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<term>Carbonate chemistry</term>
<term>Carbonic acid</term>
<term>Cloudless days</term>
<term>Community calcification rates</term>
<term>Community dissolution</term>
<term>Community metabolism</term>
<term>Community photosynthesis</term>
<term>Community respiration</term>
<term>Concentration scale</term>
<term>Constant light</term>
<term>Continuous measurements</term>
<term>Control volume</term>
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<term>Coral acropora cervicornis</term>
<term>Coral calcification</term>
<term>Coral growth</term>
<term>Coral reef</term>
<term>Coral reef communities</term>
<term>Coral reef metabolism</term>
<term>Coral reef studies</term>
<term>Coral reefs</term>
<term>Cuet</term>
<term>Current directions</term>
<term>Daily community</term>
<term>Daily community respiration</term>
<term>Dickson</term>
<term>Diurnal changes</term>
<term>Diurnal variations</term>
<term>Ecol</term>
<term>Error bars</term>
<term>Eulerian approach</term>
<term>French polynesia</term>
<term>Fringing reef</term>
<term>Galaxea fascicularis</term>
<term>Gattuso</term>
<term>Geophys</term>
<term>Gnet</term>
<term>Gnet jno3</term>
<term>Great barrier reef</term>
<term>Gross calcification</term>
<term>Gross photosynthesis</term>
<term>Gross rates</term>
<term>Hawaii institute</term>
<term>Heavy cloud</term>
<term>Heterotrophic bacteria</term>
<term>High rates</term>
<term>Higher rates</term>
<term>Hourly</term>
<term>Hourly rates</term>
<term>Incident light</term>
<term>Indian ocean</term>
<term>Influence rates</term>
<term>Inorganic carbon</term>
<term>Kinsey</term>
<term>Late winter</term>
<term>Light incident</term>
<term>Light levels</term>
<term>Light sensor</term>
<term>Limnol</term>
<term>Marine biology</term>
<term>Mass transfer limitation</term>
<term>Metabolic rates</term>
<term>Metabolism</term>
<term>Mmol</term>
<term>Mmol caco3</term>
<term>Mmol mmol</term>
<term>Mmol mmol matm mmol</term>
<term>Mmol quanta</term>
<term>Monte carlo approach</term>
<term>Natural reef communities</term>
<term>Nighttime gnet</term>
<term>Nighttime rates</term>
<term>Ningaloo</term>
<term>Ningaloo reef</term>
<term>Nitrate</term>
<term>Nitrate concentrations</term>
<term>Nitrate phosphate</term>
<term>Nitrogen uptake</term>
<term>Nonlinear regressions</term>
<term>Nutrient</term>
<term>Nutrient enrichment</term>
<term>Nutrient uptake</term>
<term>Nutrient uptake rates</term>
<term>Ocean acidification</term>
<term>Oceanogr</term>
<term>Open circles</term>
<term>Organic carbon production</term>
<term>Other variables</term>
<term>Oxygen concentration</term>
<term>Oxygen time series</term>
<term>Pco2</term>
<term>Perfect relationship</term>
<term>Photosynthesis</term>
<term>Photosynthetic</term>
<term>Photosynthetic energy</term>
<term>Photosynthetic quotient</term>
<term>Physical chemical</term>
<term>Present reef</term>
<term>Present reef community</term>
<term>Present study</term>
<term>Primary production</term>
<term>Reef</term>
<term>Reef calcification</term>
<term>Reef calcification figure</term>
<term>Reef communities</term>
<term>Reef community</term>
<term>Reef crest</term>
<term>Reef systems</term>
<term>Reef transport</term>
<term>Respiration</term>
<term>Salinity</term>
<term>Same reef</term>
<term>Same time</term>
<term>Seasonal changes</term>
<term>Seasonal differences</term>
<term>Seaward location</term>
<term>Seawater</term>
<term>Seawater acidification</term>
<term>Shallow reef communities</term>
<term>Shallow reef environments</term>
<term>Silverman</term>
<term>Similar latitudes</term>
<term>Similar water temperatures</term>
<term>Solid lines</term>
<term>Square difference</term>
<term>Study area</term>
<term>Study period</term>
<term>Study periods</term>
<term>Study site</term>
<term>Stylophora pistillata</term>
<term>Surface waters</term>
<term>Survey period</term>
<term>Synthetic seawater</term>
<term>Time scales</term>
<term>Total alkalinity</term>
<term>Total hydrogen</term>
<term>Total nitrogen uptake</term>
<term>Transit time</term>
<term>Uptake</term>
<term>Volume transport</term>
<term>Water chemistry</term>
<term>Water column</term>
<term>Water motion</term>
<term>Water samples</term>
<term>Water temperature</term>
<term>Water temperatures</term>
<term>Waters incident</term>
<term>Wave heights</term>
<term>West cape</term>
<term>West coast</term>
<term>Western australia</term>
<term>Winkler titration</term>
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<term>Acidification</term>
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<front>
<div type="abstract">Rates of net production, net calcification, and nutrient uptake were measured in a coral‐dominated reef flat community on Ningaloo Reef in northwestern Australia under seasonally minimum and maximum light levels. Daily integrated light decreased twofold while water temperatures remained relatively constant increasing by only 1°C on average from summer to winter. Rates of daily community gross primary production (GPP) were only 33% ± 9% higher in summer than in winter (1400 ± 70 versus 1050 ± 60 mmol C m−2 d−1), far less than the twofold seasonal changes reported for most shallow reef communities. Rates of daily community net calcification (Gnet) were not significantly different between seasons (190 ± 40 mmol CaCO3 m−2 d−1 in summer versus 200 ± 10 mmol CaCO3 m−2 d−1 in winter). The average rate of total nitrogen uptake (dissolved + particulate) was also not significantly different between summer and winter (8.3 ± 3.8 versus 6.6 ± 3.4 mmol N m−2 d−1, respectively), despite evidence of sporadically high nitrate uptake in both seasons. In summer, rates of hourly net calcification (gnet) were linearly correlated with diurnal changes in net production, pH, and aragonite saturation state (Ωar); and were mostly correlated with light except at mid‐day under heavy cloud cover. However, in winter,gnet was independent of diurnal changes in light, net production, pH, and Ωar indicating that the reef flat community had possibly reached a threshold above which rates of net calcification were insensitive to diurnal changes in their environment.</div>
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