Solar radiation (PAR and UVA) and water temperature in relation to biochemical performance of Gelidium corneum (Gelidiales, Rhodophyta) in subtidal bottoms off the Basque coast

Quintano, E.; Ganzedo, Unai; Díez, I.; Figueroa, Félix L.; Gorostiaga, J.M.

doi:10.1016/j.seares.2013.05.008

Cited by 25 publications

(22 citation statements)

References 59 publications

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“…In our study, nitrogen supply was tentatively kept the same during the week and, at least for the treatment of 600 μmol photons m −2 s −1 , more rigid individuals were observed. Morphological similarities between our results and Quintano et al (2013) were verified only by the end of the 1000 μmol photons m −2 s −1 culture treatment, associated with a reduction on the growth rate. It suggests that, above a critical point, light intensity turns prejudicial to algae development.…”

Section: Discussionsupporting

confidence: 79%

“…Therefore, it is possible to suggest that the loss of pigmentation by G. tenuifrons, at least in the experimental design adopted here, is not necessarily associated with severe damage to the photosynthetic apparatus; on the contrary, the loss of color may reflect photoacclimation and photoprotection strategies. Quintano et al (2013), in a field study with Gelidium corneum, suggested that pigment lost could be associated with nitrogen deficiency, resulting in more fragile individuals. In our study, nitrogen supply was tentatively kept the same during the week and, at least for the treatment of 600 μmol photons m −2 s −1 , more rigid individuals were observed.…”

Section: Discussionmentioning

confidence: 99%

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Growth and photosynthetic pigments of Gracilariopsis tenuifrons (Rhodophyta, Gracilariaceae) under high light in vitro culture

2014

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High levels of irradiance may affect the growth and development of photosynthetic organisms, changing concentrations of carotenoids and chlorophylls. These changes may indicate different photoprotection strategies. In this study, gametophytic apical portions of Gracilariopsis tenuifrons were cultivated under controlled laboratory conditions for 1 week, at different light irradiances: 60 (control), 600, and 1,000 μmol photons m −2 s −1 . Growth rate, amount, and composition of pigments were analyzed daily. Color of seaweeds exposed to 600 and 1000 μmol photons m −2 s −1 varied along the days, from red to yellowish, suggesting a decrease in vital processes as photosynthesis and growth. However, no decrease in biomass was observed. Actually, there was an increase at growth rates for the algae kept under higher light intensities. The main registered pigments were chlorophyll a, β-carotene, and zeaxanthin. β-carotene and chlorophyll a levels were lower in algae exposed to high light intensity. In treatment exposed to 600 μmol photons m −2 s −1 , this reduction was 42 and 35 %, respectively, while in those exposed to 1000 μmol photons m −2 s −1 the values were 55 and 50 % lower than the control. The lower levels of these pigments may be associated with the reduction in energy harvesting by the photosynthetic complexes-antennae, in an effort to dissipate the high excitation impinged over the photosynthesis system as a whole. For zeaxanthin levels, a 20 % increase was observed in the beginning of the experiment, which was followed by a drop to the initial levels, suggesting the role of this pigment in this alga's photoprotection process.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Growth and photosynthetic pigments of Gracilariopsis tenuifrons (Rhodophyta, Gracilariaceae) under high light in vitro culture

2014

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“…Attenuation coefficients in water (Kd PAR and Kd UVA ) were measured using PAR (QSO-SUN 2.5V) and UV-R (USB-SU 100, Onset Computer) sensors sealed within a waterproof polycarbonate box (OtterBox3000). Kd UVB was not measured due to the high absorption of the polycarbonate box in the UVB spectral band (Quintano et al 2013).…”

Section: Environmental Conditionsmentioning

confidence: 99%

Short-term ecophysiological and biochemical responses of Cystoseira tamariscifolia and Ellisolandia elongata to environmental changes

Celis-Plá¹,

Martínez²,

Quintano³

et al. 2014

Aquat. Biol.

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Short-term ecophysiological and biochemical responses of Cystoseira tamariscifolia and Ellisolandia elongata to changes in solar irradiance and nutrient levels were analyzed in situ in oligotrophic coastal waters by transferring macroalgae collected at 0.5 and 2.0 m depth and exposing them to 2 irradiance levels (100 and 70% of surface irradiance) and nutrient conditions (nutrient-enriched and non-enriched). Both species were affected by changes in irradiance and nutrient levels. Few interactive effects between these 2 physical stressors were found, suggesting major additive effects on both species. C. tamariscifolia collected at 0.5 m and exposed to 70% irradiance had the highest maximal electron transport rate (ETR max ), saturated irradiance (Ek ETR ) and chl a content and the lowest antioxidant activity. Under the same conditions, E. elongata had increased Ek ETR , antheraxanthin and β-carotene content. At 100% irradiance, C. tamariscifolia collected at 2.0 m had higher maximal quantum yield (F v /F m ), photosynthetic efficiency (α ETR ), ETR max , maximal non-photochemical quenching (NPQ max ), saturation irradiance for NPQ (Ek NPQ ), and antheraxanthin and polyphenol content increased, whereas in E. elongata only α ETR increased. In nutrient-enriched conditions, phenolic compounds, several carotenoids and N content increased in C. tamariscifolia at both depths. E. elongata from 2.0 m depth at 100% irradiance and nutrient-enriched conditions showed increased N content and total mycosporine-like amino acids (MAAs). Our results show rapid photophysiological responses of C. tamariscifolia to variations in in situ irradiance and nutrient conditions, suggesting efficient photoacclimation to environmental changes. In E. elongata, F v /F m and ETR max did not change in the transplant experiment; in contrast, N content, pigment and MAAs (biochemical variables) changed. The responses of these macroalgae to nutrient enrichment indicate oligotrophic conditions at the study site and environmental stress.

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“…Exposure to UVR and PAR will also depend on the bio-optical proper-ties of the water column, though these can be complex and quite varied between sites. For example, decreased turbidity of seawater in regions of the Bay of Biscay led to increased UV penetration with impacts on the physiological performance of the red alga Gelidium corneum (Quintano et al 2013). Phytoplankton in waters with faster mixing rates exhibit different responses to UVA and UVB irradiances compared with those in less mixed or static conditions , Jin et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Interactive effects of nutrient supply and other environmental factors on the sensitivity of marine primary producers to ultraviolet radiation: implications for the impacts of global change

Beardall¹,

Stojkovic²,

Gao

2014

Aquat. Biol.

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Understanding the effects of global climate change on the algae that form the basis of most aquatic food chains is of paramount importance in our ability to make informed decisions about the future of production systems, marine ecosystems, and the global carbon cycle. Despite the Montreal Protocol to restrict the release of harmful chlorofluorocarbons into the atmosphere, ozone levels have not recovered at all latitudes, and in some regions levels of UVB are still rising due to interactions with phenomena related to climate change. However, the effects of UV radiation may be modulated by other environmental changes. In this review, we discuss how factors such as elevated CO 2 and ocean acidification, increasing temperature, and reduced nutrient supply associated with enhanced stratification can interact with UV radiation to affect algal physiological performance and growth. For instance, nutrient limitation enhances UV-induced inhibition due to the reduced capacity of algae to screen out UVB and/or impairment of their capacity to repair damage. Higher temperatures tend to promote repair more than photochemical damage so result in a net reduction of UV inhibition. Elevated CO 2 and ocean acidification has complex interactions with UV radiation, with mixed net outcomes for algal productivity. Differential effects of UVA and UVB have been shown to depend on their irradiance levels; while moderate levels of UVA stimulate growth and photosynthesis of some algae, UVB almost always results in harm to marine primary producers.

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Solar radiation (PAR and UVA) and water temperature in relation to biochemical performance of Gelidium corneum (Gelidiales, Rhodophyta) in subtidal bottoms off the Basque coast

Cited by 25 publications

References 59 publications

Growth and photosynthetic pigments of Gracilariopsis tenuifrons (Rhodophyta, Gracilariaceae) under high light in vitro culture

Growth and photosynthetic pigments of Gracilariopsis tenuifrons (Rhodophyta, Gracilariaceae) under high light in vitro culture

Short-term ecophysiological and biochemical responses of Cystoseira tamariscifolia and Ellisolandia elongata to environmental changes

Interactive effects of nutrient supply and other environmental factors on the sensitivity of marine primary producers to ultraviolet radiation: implications for the impacts of global change

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