A framework for understanding drag parameterizations for coral reefs

Rosman, Johanna H.; Hench, James L.

doi:10.1029/2010jc006892

Cited by 97 publications

(138 citation statements)

References 45 publications

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“…While it is currently unknown why upstream−downstream variation in pCO 2 in reef waters in Moorea was so small at the time of measurement, it is possible that contempo-rary values reflect the low coral cover in the back reef of Moorea (Edmunds et al 2010, Trapon et al 2011), the strong cross reef transport of seawater in Moorea that lessens residence time of water over the reef (e.g. Rosman & Hench 2011), and the greater depth of water (~2 m) compared to Lady Elliot Island (~0.4 m) where diel pCO 2 variation is strongly developed (Shaw et al 2012).…”

Section: Discussionmentioning

confidence: 99%

“…Colonies from an 'upstream' and 'downstream' habitat along a flow gradient across a back reef habitat in Moorea, French Polynesia (e.g. Rosman & Hench 2011) were compared to evaluate the potential role of habitat on the response to exposure to oscillatory pCO 2 of varying magnitudes. Our study was performed using the coral Acropora hyacinthus, which is found commonly in both upstream and downstream habitats on the back reef of Moorea.…”

Section: Introductionmentioning

confidence: 99%

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Diel pCO2 oscillations modulate the response of the coral Acropora hyacinthus to ocean acidification

Comeau¹,

Edmunds²,

Spindel³

et al. 2014

Mar. Ecol. Prog. Ser.

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To investigate the effect of diel variation in pCO 2 on coral calcification, branches of Acropora hyacinthus were collected in 2 habitats (upstream and downstream in a unidirectional flow) in a shallow back reef in Moorea, French Polynesia, where different diel amplitudes of pCO 2 oscillation were expected. Corals were maintained for 6 wk under different pCO 2 regimes (constant versus oscillatory), each delivered in 3 configurations: constant conditions of 400 µatm, 700 µatm, and 1000 µatm pCO 2 , or oscillatory conditions varying daily from 280 to 550 µatm, 550 to 1000 µatm, or 400 to 2000 µatm, with minima and maxima during the day and night, respectively. Calcification rates in all treatments tended to increase over time, and the interaction between Time and pCO 2 regime (i.e. constant versus oscillating) was significant (or close to significant) for upstream corals due to higher calcification in oscillatory pCO 2 . A significant pCO 2 regime effect was detected in the highest pCO 2 for downstream corals, with higher calcification in the 400 to 2000 µatm oscillatory pCO 2 treatment compared to the 1000 µatm constant pCO 2 treatment. After 6 wk, calcification of A. hyacinthus was affected significantly by habitat, the pCO 2 level, and the pCO 2 regime. Calcification generally was reduced by high pCO 2 and was ≥21% greater in 400 to 2000 µatm oscillatory pCO 2 versus 1000 µatm constant pCO 2 treatment. Increased calcification in the 400 to 2000 µatm oscillatory pCO 2 treatment suggests that natural diel oscillations in pCO 2 could play a role by reducing the locally negative effects of rising pCO 2 associated with ocean acidification on coral calcification.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diel pCO2 oscillations modulate the response of the coral Acropora hyacinthus to ocean acidification

Comeau¹,

Edmunds²,

Spindel³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…Wave set-up generates an across-reef horizontal pressure gradient force that drives a mean current toward the reef flat and lagoon. Currents and waves are modified and attenuated across the reef by turbulent dissipation over the rough coral substrate Hench 2011, Hench andRosman 2013). Thus offshore wave forcing and drag due to the coral substrate produce gradients in both mean and oscillatory flow on the back reef.…”

Section: Study Sitementioning

confidence: 99%

“…Thus offshore wave forcing and drag due to the coral substrate produce gradients in both mean and oscillatory flow on the back reef. This conceptual model has been previously studied in a number of reef flat systems (e.g., Hearn et al 1999), including the field site examined here , Rosman and Hench 2011.…”

Section: Study Sitementioning

confidence: 99%

Hydrodynamics influence coral performance through simultaneous direct and indirect effects

Lenihan

Hench

Holbrook

et al. 2015

Ecology

Self Cite

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Abstract. Hydrodynamic conditions can influence the distribution and abundance of aquatic species in many ways, including directly through disturbance and resource delivery, and indirectly by altering environmental cues and species interactions. In coral reef ecosystems, corallivory is an important top-down control of coral populations, while water motion can enhance coral performance via autotrophic and/or heterotrophic pathways. Using a large-scale field assay in Mo'orea, French Polynesia, we measured the extent to which the growth of a branching acroporid coral is influenced by hydrodynamics that deliver nutrients and food to corals but also impede corallivory. We explored two hydrodynamic properties that characterized our study system, mean current velocity and current velocity fluctuation (a measure of waves and turbulence). In treatments where predators were excluded, coral skeletal growth was positively related to mean current velocity, whereas no effect of velocity fluctuations was detected. In the presence of predators, growth was positively related to velocity fluctuations, but no relationship with mean velocity was detected. The major effect of velocity fluctuations was to reduce the attack rate of corallivores by lowering both their per capita bite rate and local density. Corals thus benefited directly from increased currents, probably through enhanced autotrophy and/or heterotrophy, and indirectly from velocity fluctuations through reduced corallivory. Our data indicate that for the coral and locale we examined, the indirect hydrodynamic effect on coral performance via reduction in corallivory was substantial, increasing daily growth rate by 4%. Hydrodynamic enhancement of acroporid coral growth via simultaneous direct and indirect effects can be important for the persistence of coral reefs as well as their recovery following disturbance.

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“…The range of values considered captures frictional coefficient estimated for a variety of reefs (e.g. Lowe et al, 2005a;Lowe et al, 2005b;Rosman and Hench, 2011;Van Dongeren et al, 2012). The hydrodynamic simulations produced a stationary time series of data suitable in duration to obtain the frequency resolution required for analysis of the low-frequency waves.…”

Section: Guam Modelmentioning

confidence: 99%

Low Frequency Wave Resonance in Fringing Reef Environments

Pomeroy

Dongeren

Lowe

et al. 2012

Int. Conf. Coastal. Eng.

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Low frequency wave resonance has been postulated to enhance damage to coral reef protected coastlines during storm events. This paper uses the numerical model XBeach to examine the dynamics that contribute to resonance that have been previously observed on a fringing reef on Guam during tropical storm Man-Yi (Péquignet et al., 2009). The methods to identify resonance in numerical (or field data) are comprehensively reviewed with three indicators of resonance proposed based upon data obtained at two locations in the model domain: 1. The water surface elevation must be highly coherent, 2. The phase difference must (closely) correspond to 0° or 180°, and 3. Amplification of the signal must be observed between the reef crest and the shoreline. XBeach simulations demonstrated that resonance could be reproduced under 'normal' wave conditions, but only when bottom friction was minimal and hence values that were atypically low for coral reefs. However, under tropical storm Man-Yi conditions, resonance was reproduced with reasonable bottom friction values. A sensitivity analysis demonstrated that, although the frequency associated with resonance was not affected by the choice of bottom friction coefficients, the magnitude of the amplification was significantly affected. Ongoing research is being undertaken to investigate the resonant response for a wider variety of reef morphologies and incident wave forcing conditions.

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A framework for understanding drag parameterizations for coral reefs

Cited by 97 publications

References 45 publications

Diel pCO2 oscillations modulate the response of the coral Acropora hyacinthus to ocean acidification

Diel pCO2 oscillations modulate the response of the coral Acropora hyacinthus to ocean acidification

Hydrodynamics influence coral performance through simultaneous direct and indirect effects

Low Frequency Wave Resonance in Fringing Reef Environments

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