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Light respiratory processes and gross photosynthesis in two scleractinian corals.

Schrameyer V, Wangpraseurt D, Hill R, Kühl M, Larkum AW, Ralph PJ - PLoS ONE (2014)

Bottom Line: Light respiration in Pocillopora damicornis was higher than in Pavona decussata under low irradiance, indicating species-specific differences in light-dependent metabolic processes.Overall, the coral P. decussata exhibited higher CO2 uptake rates than P. damicornis over the experimental irradiance range.Differences in light respiration and CO2 availability could be due to host-specific characteristics that modulate the symbiont microenvironment, its photosynthesis, and hence the overall performance of the coral holobiont.

View Article: PubMed Central - PubMed

Affiliation: Plant Functional Biology and Climate Change Cluster, School of the Environment, University of Technology, Sydney, Ultimo, New South Wales, Australia.

ABSTRACT
The light dependency of respiratory activity of two scleractinian corals was examined using O2 microsensors and CO2 exchange measurements. Light respiration increased strongly but asymptotically with elevated irradiance in both species. Light respiration in Pocillopora damicornis was higher than in Pavona decussata under low irradiance, indicating species-specific differences in light-dependent metabolic processes. Overall, the coral P. decussata exhibited higher CO2 uptake rates than P. damicornis over the experimental irradiance range. P. decussata also harboured twice as many algal symbionts and higher total protein biomass compared to P. damicornis, possibly resulting in self-shading of the symbionts and/or changes in host tissue specific light distribution. Differences in light respiration and CO2 availability could be due to host-specific characteristics that modulate the symbiont microenvironment, its photosynthesis, and hence the overall performance of the coral holobiont.

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Light respiration (Rlight O2 micro) of the hard coral species Pocillopora damicornis (clear circle) and Pavona decussata (clear triangle) are displayed as a function of 6 irradiances (mean ±s.e.m.; n = 2).Tukey honest significance difference test results are indicated, where capital letters are describing groupings for P. damicornis and lower case letters groupings of P. decussata (p<0.05).
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pone-0110814-g002: Light respiration (Rlight O2 micro) of the hard coral species Pocillopora damicornis (clear circle) and Pavona decussata (clear triangle) are displayed as a function of 6 irradiances (mean ±s.e.m.; n = 2).Tukey honest significance difference test results are indicated, where capital letters are describing groupings for P. damicornis and lower case letters groupings of P. decussata (p<0.05).

Mentions: Light respiration (Rlight O2 micro) increased with increasing irradiance (Fig. 2), with a maximum Rlight O2 micro of ∼0.5 nmol O2 cm−2 s−1 for both coral species (one-way ANOVA, F(5,6)  = 10.26; p = 0.007 for P. decussata and F(5)  = 101.08; p<0.001 for P. damicornis). However, Rlight O2 micro increased more rapidly with irradiance in P. damicornis than in P. decussata (Fig. 2, also see Table S1).


Light respiratory processes and gross photosynthesis in two scleractinian corals.

Schrameyer V, Wangpraseurt D, Hill R, Kühl M, Larkum AW, Ralph PJ - PLoS ONE (2014)

Light respiration (Rlight O2 micro) of the hard coral species Pocillopora damicornis (clear circle) and Pavona decussata (clear triangle) are displayed as a function of 6 irradiances (mean ±s.e.m.; n = 2).Tukey honest significance difference test results are indicated, where capital letters are describing groupings for P. damicornis and lower case letters groupings of P. decussata (p<0.05).
© Copyright Policy
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4216011&req=5

pone-0110814-g002: Light respiration (Rlight O2 micro) of the hard coral species Pocillopora damicornis (clear circle) and Pavona decussata (clear triangle) are displayed as a function of 6 irradiances (mean ±s.e.m.; n = 2).Tukey honest significance difference test results are indicated, where capital letters are describing groupings for P. damicornis and lower case letters groupings of P. decussata (p<0.05).
Mentions: Light respiration (Rlight O2 micro) increased with increasing irradiance (Fig. 2), with a maximum Rlight O2 micro of ∼0.5 nmol O2 cm−2 s−1 for both coral species (one-way ANOVA, F(5,6)  = 10.26; p = 0.007 for P. decussata and F(5)  = 101.08; p<0.001 for P. damicornis). However, Rlight O2 micro increased more rapidly with irradiance in P. damicornis than in P. decussata (Fig. 2, also see Table S1).

Bottom Line: Light respiration in Pocillopora damicornis was higher than in Pavona decussata under low irradiance, indicating species-specific differences in light-dependent metabolic processes.Overall, the coral P. decussata exhibited higher CO2 uptake rates than P. damicornis over the experimental irradiance range.Differences in light respiration and CO2 availability could be due to host-specific characteristics that modulate the symbiont microenvironment, its photosynthesis, and hence the overall performance of the coral holobiont.

View Article: PubMed Central - PubMed

Affiliation: Plant Functional Biology and Climate Change Cluster, School of the Environment, University of Technology, Sydney, Ultimo, New South Wales, Australia.

ABSTRACT
The light dependency of respiratory activity of two scleractinian corals was examined using O2 microsensors and CO2 exchange measurements. Light respiration increased strongly but asymptotically with elevated irradiance in both species. Light respiration in Pocillopora damicornis was higher than in Pavona decussata under low irradiance, indicating species-specific differences in light-dependent metabolic processes. Overall, the coral P. decussata exhibited higher CO2 uptake rates than P. damicornis over the experimental irradiance range. P. decussata also harboured twice as many algal symbionts and higher total protein biomass compared to P. damicornis, possibly resulting in self-shading of the symbionts and/or changes in host tissue specific light distribution. Differences in light respiration and CO2 availability could be due to host-specific characteristics that modulate the symbiont microenvironment, its photosynthesis, and hence the overall performance of the coral holobiont.

Show MeSH