Light respiratory processes and gross photosynthesis in two scleractinian corals

Verena Schrameyer; Daniel Wangpraseurt; Ross Hill; Michael Kühl; Anthony W.D. Larkum; Peter J. Ralph

doi:10.1371/journal.pone.0110814

Light respiratory processes and gross photosynthesis in two scleractinian corals

Verena Schrameyer, Daniel Wangpraseurt, Ross Hill, Michael Kühl, Anthony W.D. Larkum, Peter J. Ralph

Marine Biology

16 Citations (Scopus)

301 Downloads (Pure)

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.

Original language	English
Article number	e110814
Journal	P L o S One
Volume	9
Issue number	10
Number of pages	9
ISSN	1932-6203
DOIs	https://doi.org/10.1371/journal.pone.0110814
Publication status	Published - 31 Oct 2014

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title = "Light respiratory processes and gross photosynthesis in two scleractinian corals",

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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AU - Schrameyer, Verena

AU - Wangpraseurt, Daniel

AU - Hill, Ross

AU - Kühl, Michael

AU - Larkum, Anthony W.D.

AU - Ralph, Peter J.

PY - 2014/10/31

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AB - 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 respiratory processes and gross photosynthesis in two scleractinian corals

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