Seasonal Photophysiological Performance of Adult Western Baltic Fucus vesiculosus (Phaeophyceae) Under Ocean Warming and Acidification

Graiff, Angelika; Bartsch, Inka; Glaser, Karin; Karsten, Ulf

doi:10.3389/fmars.2021.666493

Cited by 10 publications

(5 citation statements)

References 111 publications

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“…Complementary energy dissipation pathway results (Figure 4 (Klughammer and Schreiber, 2008;Graiff et al, 2021). In fact, our pigment content results (Figure 5) demonstrated that increased light conditions caused damage of the photosynthetic apparatus of B. montagnei and B. calliptera.…”

Section: Discussionmentioning

confidence: 61%

Photosynthetic performance, growth, pigment content, and photoprotective compounds of the mangrove macroalgae Bostrychia calliptera and Bostrychia montagnei (Rhodophyta) under light stress

Borburema

Graiff²,

Marinho‐Soriano³

et al. 2022

Front. Mar. Sci.

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Increased solar radiation on the Earth’s surface is expected due to global change. Mangrove macroalgae can be negatively affected by increased solar radiation, since some species, such as Bostrychia spp. have been characterized as typical “shade” plants. Thus, we investigated the effects of increasing photon flux densities (PFDs: 170, 267, 443, 638, and 1155 µmol photons m–2 s–1) on the physiological performance of Bostrychia calliptera and Bostrychia montagnei from a tropical mangrove. Several photosynthesis–related parameters indicated that both species decreased their photosynthetic performance under increasing PFDs, with photosynthesis of B. montagnei being more affected than that of B. calliptera. Bostrychia calliptera exhibited highest growth under 638 µmol photons m–2 s–1 while at 1155 µmol photons m–2 s–1 it was inhibited. The highest growth of Bostrychia montagnei was observed under 267 µmol photons m–2 s–1. Higher PFDs led to growth inhibition. The phycobiliprotein and chlorophyll a content of B. montagnei was degraded under increased PFDs. In B. calliptera only chlorophyll a degradation was observed. The mycosporine-like amino acid contents (photoprotective metabolites) of both species were degraded under increasing PFDs, which was more pronounced in B. montagnei. Our results demonstrated that increased solar radiation on estuarine tropical ecosystems will be detrimental to the physiological performance of B. calliptera and B. montagnei. Our results also demonstrated that B. montagnei was more negatively affected by increased light stress than B. calliptera. This can explain its preferential occurrence in more shaded microhabitats compared to B. calliptera. Our data document for the first time light acclimation in the studied macroalgae and the deleterious effects of increased light stress on the genus Bostrychia.

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Section: Discussionmentioning

confidence: 61%

Photosynthetic performance, growth, pigment content, and photoprotective compounds of the mangrove macroalgae Bostrychia calliptera and Bostrychia montagnei (Rhodophyta) under light stress

Borburema

Graiff²,

Marinho‐Soriano³

et al. 2022

Front. Mar. Sci.

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“…This might be an acclimation response to reduced irradiance at the onset of the dark period. Similarly, Graiff et al (2021) reported that the maximum Chl a in the ochrophyte Fucus vesiculosus from the Baltic Sea was found in winter. A different behavior appeared in A. esculenta, showing a very significant decrease of Chl a during the first weeks of dark incubation.…”

Section: Discussionmentioning

confidence: 80%

A Warmer Arctic Compromises Winter Survival of Habitat-Forming Seaweeds

2022

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Continuous winter darkness at a latitude of 79°N was simulated in cultures of four species of Arctic seaweeds at 3 and 8°C. The laminarians Saccharina latissima and Alaria esculenta, and the rhodophytes Phycodrys rubens and Ptilota gunneri were monitored for 4 months in total darkness and after 1 week following light return in early spring, under controlled laboratory conditions. Biomass loss during darkness was enhanced by the high temperature in all species. At 8°C, the two laminarians were unable to resume growth upon re-illumination. Alaria esculenta showed new blade production by the end of the dark period, but only at 3°C. In all species, the photosynthetic ability was sustained, not suspended, during the whole dark period. P. rubens exhibited lower photosynthetic potential at 8°C than at 3°C during the darkness period, but it was able to recover its O2 evolving potential upon re-illumination, as P. gunneri and S. latissima did, but the latter only at 3°C. The reactivation of photosynthesis seemed to involve photosystem II over photosystem I, as 7 d of photoperiod after the prolonged darkness was not enough to fully recover the PAM-related photosynthetic parameters. Only small changes were recorded in the internal chemical composition (total C, total N, carbohydrates, proteins, and lipids), but species-specific differences were observed. Unlike subarctic areas with an operating photoperiod along the year, a warmer polar night might pose a limit to the ability of multi-year seaweeds to occupy the new ice-free illuminated areas of the Arctic coasts, so that newcomers will potentially be restricted to the spring-summer season.

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“…However, during the winter experiment, elevated temperatures increased the degree of lipid peroxidation and SOD activity significantly, indicating intensified oxidative stress for F. vesiculosus . The observed negative effect of experimental winter warming on overall F. vesiculosus performance [ 65 , 95 , 96 ] appeared contradictorily, as the experimental warming elevated temperatures from ambient 4–7 °C to 8–12 °C (December to January) and thus towards the optimal temperature range for F. vesiculosus growth in the western Baltic Sea (15–20 °C, [ 68 ]). These conflicting results might be explained by the energy imbalance between restricted photosynthesis at low-light winter conditions and acceleration of metabolic activity at elevated winter temperatures [ 97 ].…”

Section: Discussionmentioning

confidence: 99%

“…This energetic imbalance at the elevated winter temperature might then be enhanced by an increased production of ROS in F. vesiculosus , requiring biosynthesis of antioxidative enzymes indicated by increasing SOD activity. This additional energy investment in the biosynthesis of antioxidative enzymes may finally cause a reduction in photosynthetic carbon gain and growth of F. vesiculosus under elevated winter temperatures [ 65 , 96 ].…”

Section: Discussionmentioning

confidence: 99%

“…During summer, the impacts of predicted warming on F. vesiculosus will be most severe, as indicated by the present study and Wahl et al [ 104 ]. The projected co-occurring increase in seawater temperatures and pCO 2 will probably have beneficial impacts in spring, autumn, and winter on F. vesiculosus , as indicated by antioxidative properties (this study), photo-physiological performance [ 96 ], growth [ 65 ], and fertility [ 95 ]. Thus, at tested joint warming and acidification, F. vesiculosus populations may slightly benefit in distinct seasons, thereby supporting an improved start into the next period of growth.…”

Section: Discussionmentioning

confidence: 99%

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Antioxidative Properties of Baltic Sea Keystone Macroalgae (Fucus vesiculosus, Phaeophyceae) under Ocean Warming and Acidification in a Seasonally Varying Environment

Graiff

Karsten

2021

Biology

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The keystone macroalga Fucus vesiculosus (Phaeophyceae), dominating shallow hard bottom zones, encounters a strongly and rapidly changing environment due to anthropogenic change over the last decades in the Baltic Sea. Thus, in four successive benthic mesocosm experiments, the single and joint effects of increased temperature (Δ + 5 °C) and pCO2 (1100 ppm) under ambient irradiances were experimentally tested on the antioxidative properties of western Baltic F. vesiculosus in all seasons. The antioxidative properties (superoxide dismutase activity and lipid peroxidation) as well as the sensitivity of F. vesiculosus photosynthetic performance (i.e., effective quantum yield) to oxidative stress under these global change scenarios were seasonally examined. F. vesiculosus exhibited high and relatively constant photosynthetic performance under artificial hydrogen peroxide (H2O2) stress in all seasons. High activities of superoxide dismutase and a relatively low degree of the biomarker for lipid peroxidation (malondialdehyde concentration) were found in F. vesiculosus. Thus, Baltic F. vesiculosus is equipped with a high antioxidative potential to tolerate strong oxidative stress for at least short periods. Antioxidative properties of F. vesiculosus were more strongly affected by warming than by acidification, resulting in significantly increased malondialdehyde concentrations under elevated temperature levels in all seasons. Oxidative stress was enhanced in F. vesiculosus under warming but seem to be modulated by seasonally varying environmental conditions (e.g., high and low irradiances) and pCO2 levels. However, more frequent summer heatwaves reaching and surpassing lethal temperatures in shallow coastal waters may determine the F. vesiculosus population’s overall persistence in the Baltic Sea.

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Seasonal Photophysiological Performance of Adult Western Baltic Fucus vesiculosus (Phaeophyceae) Under Ocean Warming and Acidification

Cited by 10 publications

References 111 publications

Photosynthetic performance, growth, pigment content, and photoprotective compounds of the mangrove macroalgae Bostrychia calliptera and Bostrychia montagnei (Rhodophyta) under light stress

Photosynthetic performance, growth, pigment content, and photoprotective compounds of the mangrove macroalgae Bostrychia calliptera and Bostrychia montagnei (Rhodophyta) under light stress

A Warmer Arctic Compromises Winter Survival of Habitat-Forming Seaweeds

Antioxidative Properties of Baltic Sea Keystone Macroalgae (Fucus vesiculosus, Phaeophyceae) under Ocean Warming and Acidification in a Seasonally Varying Environment

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