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11 results for “photoacclimation”
Data for Final Revised Version of "Photoacclimation and Photoadaptation Sensitivity in a Global Ecosystem Model"
<p>This repository contains the data and codes used to create the figures for the REVISED VERSION of the manuscript "Photoacclimation and Photoadaptation Sensitivity in a Global Earth System Model", by Charles A. Stock, John P. Dunne, Jessica Y. Luo, Andrew C. Ross, Nicolas Van Oostende, Niki Zadeh, Theresa J. Cordero, Xiao Liu and Yi-Cheng Teng. It also contains the COBALT Fortran codes used to generate the simulations. </p> <p>This article has been accepted to the Journal of Advances in Modeling the Earth System (JAMES). This update includes minor corrections implemented during proof corrections to ensure that all Figures and Tables were consistent in their treatment of data from the high Arctic (> 85 deg. N Latitude). The updates can be seen in minor changes to the "residual_and_skill" files.</p> <p>The codebase used for this work can be found in the following Github repository:</p> <p>https://github.com/NOAA-CEFI-Regional-Ocean-Modeling/ocean_BGC/releases/tag/COBALTv3_202501</p>
Data from: Photoacclimation and induction of light-enhanced calcification in the mesophotic coral Euphyllia paradivisa
Corals and their photosymbionts experience inherent changes in light along depth gradients, leading them to have evolved several well-investigated photoacclimation strategies. As coral calcification is influenced by light (a process described as LEC-"light enhanced calcification"), studies have sought to determine the link between photosynthesis and calcification, but many puzzling aspects still persist. Here we examine the physiology of Euphyllia paradivisa, a coral species found at a wide range of depths but that is strictly mesophotic in the Red Sea; and also examines the coupling between photosynthesis and light-enhanced calcification by investigating the response of the coral under several controlled light regimes during a long-term experiment. E. paradivisa specimens were collected from 40-50 m depth and incubated under three light conditions for a period of one year: full-spectrum shallow-water light (~3 m, e.g. shallow-light treatment); blue deep-water light (~40 m, e.g. mesophotic-light treatment); or total darkness (e.g. dark treatment). Net photosynthesis remained similar in the shallow-light treated corals compared to the mesophotic-light treated corals, under both low and high light. However, calcification increased dramatically with increasing light intensity in the shallow-light treated corals suggesting a decoupling between these processes. Photoacclimation to shallow-water conditions was indicated by enhanced respiration, a higher density of zooxanthellae per polyp, and lower chlorophyll a content per cell. The dark-treated corals became completely bleached but did not lower their metabolism below that of the mesophotic-light treated corals. No Symbiodinium clade shift was found following the year-long light treatments. We conclude that E. paradivisa, and its original symbiont clade, can adapt to various light conditions by controlling its metabolic rate and growth energy investment, and consequently induce LEC.
Data from: Resolving coral photoacclimation dynamics through coupled photophysiological and metabolomic profiling
Corals continuously adjust to short term variation in light availability on shallow reefs. Long-term light alterations can also occur due to natural and anthropogenic stressors, as well as management interventions such as coral transplantation. Although short term photophysiological responses are relatively well-understood in corals, little information is available regarding photoacclimation dynamics over weeks of altered light availability. We coupled photophysiology and metabolomic profiling to explore changes that accompany longer-term photoacclimation in a key Great Barrier Reef coral species (Acropora muricata). High (HL) and low light (LL) acclimated corals were collected from the reef and reciprocally exposed to high and low light ex situ. Rapid light curves using Pulse Amplitude Modulation (PAM) fluorometry revealed photophysiological acclimation of LL to HL and HL to LL shifted corals within 21 days. A subset of colonies sampled at 7 and 21 days for untargeted LC-MS and GC-MS metabolomic profiling revealed metabolic reorganization before acclimation was detected using PAM fluorometry. Metabolomic shifts were more pronounced for LL to HL treated corals than their HL to LL counterparts. Compounds driving metabolomic separation between HL-exposed and LL control colonies included amino acids, organic acids, fatty acids and sterols. Reduced glycerol and campesterol suggest decreased translocation of photosynthetic products from symbiont to host in LL to HL shifted corals, with concurrent increases in fatty acid abundance indicating reliance on stored lipids for energy. We discuss how these data provide novel insight into environmental regulation of metabolism and implications for management strategies that drive rapid changes in light availability.
Data and code for: Photoacclimation dynamics in coral holobionts responding to thermal and irradiance changes correlate with photon pressure per symbiont
<p>Code and data used in the publication "Photoacclimation dynamics in coral holobionts responding to thermal and irradiance changes correlate with photon pressure per symbiont". For queries about this dataset please email robert.mason1@uq.net.au</p>
Data from: Photoacclimation and induction of light-enhanced calcification in the mesophotic coral Euphyllia paradivisa
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Data from: Resolving coral photoacclimation dynamics through coupled photophysiological and metabolomic profiling
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Data from: Intraspecific and interspecific variation in thermotolerance and photoacclimation in Symbiodinium dinoflagellates
Light and temperature are major drivers in the ecology and biogeography of symbiotic dinoflagellates living in corals and other cnidarians. We examined variations in physiology among 11 strains comprising five species of clade A Symbiodinium. We grew cultures at 26°C (control) and 32°C (high temperature) over a duration of 18 days while measuring growth and photochemical efficiency (Fv/Fm). Responses to thermal stress ranged from susceptible to tolerant across species and strains. Most strains exhibited a decrease in cell densities and Fv/Fm when grown at 32°C. Tolerance to high temperature (T32) was calculated for all strains, ranging from 0 (unable to survive at high temperature) to 1 (able survive at high temperature). There was substantial variation in thermotolerance across species and among strains. One strain had a T32 close to 1, indicating that growth was not reduced at 32°C for only this one strain. To evaluate the combined effect of temperature and light on physiological stress, we selected three strains with different levels of thermotolerance (tolerant, intermediate and susceptible) and grew them under five different light intensities (65, 80, 100, 240 and 443 µmol quanta m−2 s−1) at 26 and 32°C. High irradiance exacerbated the effect of high temperature, particularly in strains from thermally sensitive species. This work further supports the recognition that broad physiological differences exist not only among species within Symbiodinium clades, but also among strains within species demonstrating that thermotolerance varies widely between species and among strains within species.
Data from: Intraspecific and interspecific variation in thermotolerance and photoacclimation in Symbiodinium dinoflagellates
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Bilin-dependent photoacclimation in Chlamydomonas reinhardtii
GEO Series GSE77388. Chlamydomonas reinhardtii. 20 samples. Type: Expression profiling by high throughput sequencing.
The retrograde signals responsible for photoacclimation in the marine diatom Phaeodactylum tricornutum
GEO Series GSE133301. Phaeodactylum tricornutum. 6 samples. Type: Expression profiling by high throughput sequencing.
Transcriptome analysis reveals regulation of gene expression during photoacclimation to high irradiance levels in Dunaliella salina (Chlorophyceae)
GEO Series GSE120965. Dunaliella salina. 9 samples. Type: Expression profiling by high throughput sequencing.
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