Optical habitats of ultraphytoplankton groups in the Gulf of Eilat (Aqaba), Northern Red Sea

Dishon, Gal; Dubinsky, Zvy; Caras, Tamir; Rahav, Eyal; Bar‐Zeev, Edo; Tzubery, Yael; Iluz, David

doi:10.1080/01431161.2011.619209

Cited by 27 publications

(27 citation statements)

References 40 publications

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“…Irradiance levels at noon were 8.8 fold higher at 3 m than at 30 m during February (winter), 14 days after transfer, and only 6.8 fold higher during August (summer) 6 months later ( Table 1). Irradiance during August, compared to February, was only 9% higher at 3 m in respect to 41% at 30 m. That difference corresponds to the documented seasonal changes in phytoplankton densities between the stratified, oligotrophic summer and the nutrient enriched winter and results in the vertical light attenuation k d at 30 m increase from its summer minimum of 0.45 m −1 to 0.8 m −1 in winter (Dishon et al, 2012). Temperature mostly changed between seasons: 20 • C at both depths during February and between 25 and 27 • C during summertime seawater stratification in August.…”

Section: Resultsmentioning

confidence: 95%

Long term photoacclimation responses of the coral Stylophora pistillata to reciprocal deep to shallow transplantation: photosynthesis and calcification

Cohen

Dubinsky

2015

Front. Mar. Sci.

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Reciprocal transplantation of Stylophora pistillata coral fragments between deep (30 m) and shallow sites (3 m) was conducted gradually and resulted with 100% survival. Photoacclimation of transplants at both depths showed two distinct phases: at the first phase, within 2 weeks, zooxanthellae density decreased below (at 3 m) and increased beyond (at 30 m) these of the control values at the new depth, while chlorophyll a per zooxanthellae cell remained as in the original depths, thereby fully adjusting areal chlorophyll concentration. On the second phase, after 6 months, zooxanthellae chlorophyll and their quantum yield (Fv/Fm) were adjusted at both new depths. Such regulated acclimation was also observed in the maximal photosynthesis rate of both transplants, whereas respiration adjustment was rapid. These results differ from previously reported rapid shade and light acclimation strategies hence we suggest that acclimation mechanism changes when certain symbiont type is exposed to depth out of its boundary zone. Despite seemingly having become physiologically acclimated, calcification at both new depths was only half the rate achieved by the controls, suggesting that the coral host requires even longer time than the symbionts to acclimate.

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Section: Resultsmentioning

confidence: 95%

Long term photoacclimation responses of the coral Stylophora pistillata to reciprocal deep to shallow transplantation: photosynthesis and calcification

Cohen

Dubinsky

2015

Front. Mar. Sci.

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“…We measured the Ex 495:545 ratios to examine the capacity of 9916 to acclimate to a series of blue-green light ratios that closely mimic its natural environment (Fig. 4) (14). Cells continued to behave as if they were in a pure light color when slight amounts of the other color was also provided, such as at a ratio of 9 μmol green photons m −2 s −1 :1 μmol blue photons m −2 s −1 (9G:1B) or at a 1G:9B ratio.…”

Section: Fcia and Fcib Inversely Regulate Expression Of Several Genommentioning

confidence: 99%

“…CA4 and related chromatic acclimation responses are useful low-light acclimation processes, optimizing photon capture and photosynthetic activity, perhaps most importantly when irradiance levels limit photosynthesis (10)(11)(12)(13). Chromatic acclimation provides a fitness advantage and allows niche exploitation in freshwater and marine environments, where water depth and seasonal fluctuations change the ambient spectral distribution (14,15). CA4 occurs in approximately…”

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confidence: 99%

Self-regulating genomic island encoding tandem regulators confers chromatic acclimation to marine Synechococcus

Sanfilippo

Nguyen

Karty

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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The evolutionary success of marine Synechococcus, the second-most abundant phototrophic group in the marine environment, is partly attributable to this group’s ability to use the entire visible spectrum of light for photosynthesis. This group possesses a remarkable diversity of light-harvesting pigments, and most of the group’s members are orange and pink because of their use of phycourobilin and phycoerythrobilin chromophores, which are attached to antennae proteins called phycoerythrins. Many strains can alter phycoerythrin chromophore ratios to optimize photon capture in changing blue–green environments using type IV chromatic acclimation (CA4). Although CA4 is common in most marine Synechococcus lineages, the regulation of this process remains unexplored. Here, we show that a widely distributed genomic island encoding tandem master regulators named FciA (for type four chromatic acclimation island) and FciB plays a central role in controlling CA4. FciA and FciB have diametric effects on CA4. Interruption of fciA causes a constitutive green light phenotype, and interruption of fciB causes a constitutive blue light phenotype. These proteins regulate all of the molecular responses occurring during CA4, and the proteins’ activity is apparently regulated posttranscriptionally, although their cellular ratio appears to be critical for establishing the set point for the blue–green switch in ecologically relevant light environments. Surprisingly, FciA and FciB coregulate only three genes within the Synechococcus genome, all located within the same genomic island as fciA and fciB. These findings, along with the widespread distribution of strains possessing this island, suggest that horizontal transfer of a small, self-regulating DNA region has conferred CA4 capability to marine Synechococcus throughout many oceanic areas.

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“…They consist of both prokaryotic and eukaryotic phytoplankton (Sieburth et al 1978). The global distribution of ultraphytoplankton is extremely wide, and they are found in polar, temperate, and tropical waters (Dishon et al 2012;Girault et al 2013). Their quantity, biomass, and productivity can be used as a quality indicator of water ecosystem (Silva et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Characterization of ultraphytoplankton pigments and functional community structure in Xiangxi Bay, China, using HPLC-CHEMTAX

Liu

et al. 2016

Journal of Freshwater Ecology

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To characterize the ultraphytoplankton community structure and understand its succession, we investigated photosynthetic pigment concentration and composition; algae phyla composition and abundance; and environmental factors in Xiangxi Bay (XXB) from February to December 2013. High-performance liquid chromatography (HPLC) analyses revealed eight diagnostic pigments: Fucoxanthin, Neoxanthin, Violaxanthin, Alloxanthin, Lutein, Zeaxanthin, Chlorophyll b and Chlorophyll a. The temporal differences between seven of the pigments (all excepting Neoxanthin) were significant (P < 0.05), and there were no significant spatial differences between the eight pigments (P > 0.05). A chemical taxonomy (CHEMTAX) calculation identified seven phyla of ultraphytoplankton: cryptophytes, chlorophytes, cyanobacteria, diatoms, euglenophytes, chrysophytes, and dinoflagellates. The temporal differences between five of the phyla (except chlorophytes and euglenophytes) were significant (P < 0.05), and there was no significant spatial difference between the seven phyla (P > 0.05). The redundancy analyses demonstrated that the key environmental factors for the succession were N-NH 4 C and P-PO 4 3-. Application of the HPLC-CHEMTAX method has provided the first analysis of ultraphytoplankton community structure in XXB, and our findings also show that environmental factors influence the succession of ultraphytoplankton over time.

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Optical habitats of ultraphytoplankton groups in the Gulf of Eilat (Aqaba), Northern Red Sea

Cited by 27 publications

References 40 publications

Long term photoacclimation responses of the coral Stylophora pistillata to reciprocal deep to shallow transplantation: photosynthesis and calcification

Long term photoacclimation responses of the coral Stylophora pistillata to reciprocal deep to shallow transplantation: photosynthesis and calcification

Self-regulating genomic island encoding tandem regulators confers chromatic acclimation to marine Synechococcus

Characterization of ultraphytoplankton pigments and functional community structure in Xiangxi Bay, China, using HPLC-CHEMTAX

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