Seasonal photoacclimation patterns in the intertidal macroalga &lt;em&gt;Cystoseira tamariscifolia&lt;/em&gt; (Ochrophyta)

Celis-Plá, Paula S. M.; Korbee, Nathalie; Gómez‐Garreta, Amelia; Figueroa, Félix L.

doi:10.3989/scimar.04053.05a

Cited by 48 publications

(36 citation statements)

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“…In other Cystoseira species, such as C. tamariscifolia, both F v /F m and ETR max also decrease in nutrient enriched treatments in field experiments at various depths (Celis-Plá et al, 2014a). In another experiment, Celis-Plá et al (2014b) found the highest ETR max in C. tamariscifolia in thalli with the lowest internal nitrogen stores i.e., winter compared to summer grown algae. On the other hand, Ek NPQ increased in all cases with the increased CO 2 as an acclimation to high light levels.…”

Section: Discussionmentioning

confidence: 87%

“…Fucoxanthin and violaxanthin levels were not affected in C. compressa whereas in P. pavonica fucoxanthin and violaxanthin increased under 70% PAB conditions, nutrient enrichment and medium CO 2 levels. We used NPQ max as an indicator of photoprotective energy dissipation efficiency (Celis-Plá et al, 2014b), and we also measured phenolic content and antioxidant activity (EC 50 ), both of which can be used as photoprotectors (Celis-Plá et al, 2014a). In C. compressa and P. pavonica NPQ max was higher in all shaded treatments with nutrient enrichment, but not in the fully lit treatments, indicating higher photoprotection when nutrients were elevated and light was reduced.…”

Section: Discussionmentioning

confidence: 99%

“…Values of DPPH concentration (mM) were plotted against plant extract concentration expressed as the EC 50 value (oxidation index, mg DW mL −1 ) required to scavenge 50% of the DPPH in the reaction mixture. Ascorbic acid was used as a control (Celis-Plá et al, 2014b).…”

Section: Physiological and Biochemical Variablesmentioning

confidence: 99%

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Macroalgal responses to ocean acidification depend on nutrient and light levels

et al. 2015

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Ocean acidification may benefit algae that are able to capitalize on increased carbon availability for photosynthesis, but it is expected to have adverse effects on calcified algae through dissolution. Shifts in dominance between primary producers will have knock-on effects on marine ecosystems and will likely vary regionally, depending on factors such as irradiance (light vs. shade) and nutrient levels (oligotrophic vs. eutrophic). Thus experiments are needed to evaluate interactive effects of combined stressors in the field. In this study, we investigated the physiological responses of macroalgae near a CO 2 seep in oligotrophic waters off Vulcano (Italy). The algae were incubated in situ at 0.2 m depth using a combination of three mean CO 2 levels (500, 700-800 and 1200 μatm CO 2 ), two light levels (100 and 70% of surface irradiance) and two nutrient levels of N, P, and K (enriched vs. non-enriched treatments) in the non-calcified macroalga Cystoseira compressa (Phaeophyceae, Fucales) and calcified Padina pavonica (Phaeophyceae, Dictyotales). A suite of biochemical assays and in vivo chlorophyll a fluorescence parameters showed that elevated CO 2 levels benefitted both of these algae, although their responses varied depending on light and nutrient availability. In C. compressa, elevated CO 2 treatments resulted in higher carbon content and antioxidant activity in shaded conditions both with and without nutrient enrichment-they had more Chla, phenols and fucoxanthin with nutrient enrichment and higher quantum yield (F v /F m ) and photosynthetic efficiency (α ETR ) without nutrient enrichment. In P. pavonica, elevated CO 2 treatments had higher carbon content, F v /F m , α ETR , and Chla regardless of nutrient levels-they had higher concentrations of phenolic compounds in nutrient enriched, fully-lit conditions and more antioxidants in shaded, nutrient enriched conditions. Nitrogen content increased significantly in fertilized treatments, confirming that these algae were nutrient limited in this oligotrophic part of the Mediterranean. Our findings strengthen evidence that brown algae can be expected to proliferate as the oceans acidify where physicochemical conditions, such as nutrient levels and light, permit.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

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Macroalgal responses to ocean acidification depend on nutrient and light levels

et al. 2015

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“…Persistent high irradiance may also lead algae to suffer nutrient stress, as red algae need nitrogen to produce more antioxidant compounds (De la Coba, Aguilera, Figueroa, de Gálvez, & Herrera, 2009). In this regard, nutrient ratios (C:N) have been widely proposed as an indicator for nutrient status in macroalgae (Celis-Plá, Korbee, Gómez-Garreta, & Figueroa, 2014;Figueroa & Korbee, 2010).…”

Section: Introductionmentioning

confidence: 99%

Depth influence on biochemical performance and thallus size of the red alga Gelidium corneum

et al. 2018

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Recent declines in the foundation species Gelidium corneum (Hudson) J.V. Lamouroux in pristine coastal stretches of the Southeastern Bay of Biscay have been documented in which individuals showed a high bleaching incidence. Among the potential factorsthat may be responsible for these changes in G. corneum abundance, it has been suggested that high levels of irradiance may be imposing stressful environmental conditions for shallow populations. Given that light is reduced exponentially as depth increases, in this investigation we examined the influence of depth on the stress of G. corneum by comparing the performance of several biochemical parameters and thallus size in plants collected at three different depths. The results revealed that plants growing in shallow waters showed lower antioxidant activity, lower concentrations of photosynthetic pigments (Chl‐a, total carotenoids, phycoerythrin), lower internal nitrogen levels (higher C:N ratio) and shorter thallus lengths than those living in deeper waters. Some of these results may be an expression of photoacclimation, but the low antioxidant activity and total carotenoid concentration detected in plants living in shallow waters suggest that the photoprotective mechanisms of G. corneum may have failed to offset photodamage. If so, our findings support previous studies that suggest that recent changes in solar radiation are partially responsible for G. corneum declines. Nevertheless, given that the metabolic performance of macroalgae is determined by the inter‐play of irradiance with other factors, including temperature and nutrient availability, further research is needed to reach a better understanding of the factors causing stress in G. corneum.

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“…the synthesis and accumulation of UV-absorbing compounds such as trihidroxicoumarins in green algae [17], polyphenols in brown algae [15,[18][19][20][21], and mycosporine-like amino acids (MAAs) in red algae species [22][23][24][25][26][27][28].…”

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confidence: 99%

Sunscreens of red algae from Patagonia: a biotechnological perspective

Navarro

2015

Pure and Applied Chemistry

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Red algae can synthesize UV-absorbing mycosporine-like amino acid (MAA) compounds to minimize the damage caused by UV radiation. MAAs are molecules with low molecular weight and absorption maxima in the UV region (310-360 nm). Combined with their antioxidant activities, these features suggest a potential application in the prevention and therapeutic treatment of afflictions related to freeradical production and UV irradiation in humans. However, the use of MAAs in biotechnological products is limited by the low concentrations of these compounds in macroalgae harvested from the wild. Thus, species with high MAA concentrations are desirable. Information on red algae from Patagonia generally shows low concentrations of MAAs. However, increased MAA or at least changes in individual MAA concentration have been observed in certain species under stressful conditions. Additionally, methanolic extracts show an interesting absorption in the UVB region in certain red algae species, such as Lophurella hoockeriana.Some marine algae that inhabit the intertidal zone are exposed to highly variable light environments. Changes in solar radiation could have important implications for the ecophysiology of algae because they influence key metabolic processes that not only affect the individual but also the population and community behaviors. UV radiation has been reported to have adverse effects on DNA [1, 2], growth [3], photosynthesis, pigments, enzyme activities [4][5][6], and increased reactive oxygen species (ROS) [7], among other indirect effects. A discussion of the UV radiation effects on algae is beyond the scope of this work, but the reader is referred to Franklin and Forster [3], Bischof et al. [8], and Pessoa [9] for more information. However, through evolution, the macrophyte metabolism has adapted to strongly changing conditions, especially in the upper intertidal zone.Most macrophytes that are frequently exposed to solar radiation have various repair and protective mechanisms to minimize the damage caused by UVB. These mechanisms include the photorepair of DNA mediated by PAR and UVA [10,11], the accumulation of antioxidant substances and antioxidant enzymes [12][13][14][15], dynamic photoinhibition [6], and increased thickness and density of the cell walls [16], which can help the organisms cope with and potentially adapt to high UVR conditions. Other UV protective mechanisms include Article note: A collection of invited papers based on presentations at the

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Seasonal photoacclimation patterns in the intertidal macroalga <em>Cystoseira tamariscifolia</em> (Ochrophyta)

Cited by 48 publications

References 65 publications

Macroalgal responses to ocean acidification depend on nutrient and light levels

Macroalgal responses to ocean acidification depend on nutrient and light levels

Depth influence on biochemical performance and thallus size of the red alga Gelidium corneum

Sunscreens of red algae from Patagonia: a biotechnological perspective

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