Ecophysiological strategies in response to UV-B radiation stress in cultures of temperate microalgae isolated from the Pacific coast of South America

Montecino, Vivian; Molina, Ximena Paola Cervantes; Martínez, G. Rodríguez; Olmedo, Maria Isabel; Retamal, Leira; Hannach, Gabriela; Orellana, Mónica V.

doi:10.4067/s0716-078x2001000200007

Cited by 8 publications

(6 citation statements)

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“…Solar UVR had a significant impact on P max during the prebloom but not during the postbloom, with UV‐A accounting for most of the inhibition with the exception of some few samples. This variability in responses to UVR of P vs E parameters agrees with previous studies: Furgal and Smith (93) and Montecino et al (94) have determined significant effects of UVR on P max , whereas Montecino and Pizarro (8), working with phytoplankton off the Chilean coast collected at different seasons, did not find significant differences in P max between radiation treatments.…”

Section: Seasonal Cycle Of Phytoplankton and Dynamics Of Uvr‐induced supporting

confidence: 92%

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶

Helbling

Barbieri

Marcoval³

et al. 2005

Photochem & Photobiology

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Patagonia area is located in close proximity to the Antarctic ozone “hole” and thus receives enhanced ultraviolet B (UV‐B) radiation (280–315 nm) in addition to the normal levels of ultraviolet A (UV‐A; 315–400 nm) and photosynthetically available radiation (PAR; 400‐700 nm). In marine ecosystems of Patagonia, normal ultraviolet radiation (UVR) levels affect phytoplankton assemblages during the three phases of the annual succession: (1) prebloom season (late summer‐fall), (2) bloom season (winter‐early spring) and (3) postbloom season (late spring‐summer). Small‐size cells characterize the pre‐and postbloom communities, which have a relatively high photosynthetic inhibition because of high UVR levels during those seasons. During the bloom, characterized by micro‐plankton diatoms, photosynthetic inhibition is low because of the low UVR levels reaching the earth's surface during winter; this community, however, is more sensitive to UV‐B when inhibition is normalized by irradiance (i.e. biological weighting functions). In situ studies have shown that UVR significantly affects not only photosynthesis but also the DNA molecule, but these negative effects are rapidly reduced in the water column because of the differential attenuation of solar radiation. UVR also affects photosynthesis versus irradiance (P vs E) parameters of some natural phytoplankton assemblages (i.e. during the pre‐ but not during the postbloom season). However, there is a significant temporal variability of P vs E parameters, which are influenced by the nutrient status of cells and taxonomic composition; taxonomic composition is in turn associated with the stratification conditions (e.g. wind speed and duration). In Patagonia, wind speed is one of the most important variables that conditions the development of the winter bloom by regulating the depth of the upper mixed layer (UML) and hence the mean irradiance received by cells. Studies on the interactive effects of UVR and mixing show that responses of phytoplankton vary according to the taxonomic composition and cell structure of assemblages; therefore cells use UVR if >90% of the euphotic zone is being mixed. In fact, cell size plays a very important role when estimating the impact of UVR on phytoplankton, with large cells being more sensitive when determining photosynthesis inhibition, whereas small cells are more sensitive to DNA damage. Finally, in long‐term experiments, it was determined that UVR can shape the diatom community structure in some assemblages of coastal waters, but it is virtually unknown how these changes affect the trophody‐namics of marine systems. Future studies should consider the combined effects of UVR on both phytoplankton and grazers to establish potential changes in biodiversity of the area.

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Section: Seasonal Cycle Of Phytoplankton and Dynamics Of Uvr‐induced supporting

confidence: 92%

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶

Helbling

Barbieri

Marcoval³

et al. 2005

Photochem & Photobiology

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“…Cellular Chl a content of strain ACDH analyzed in the current study was lower than those analyzed in previous studies (Carlsson et al, 1998;Montecino et al, 2001;Carignan et al, 2002;Navarro et al, 2006), but comparable to the values of Alexandrium tamarense treated with similar concentration of nitrogen . The addition of three N substrates to the Nstarved cells led to a rapid increase of cellular Chl a content in strain ACDH, suggesting that all the three N substrates could be utilized efficiently for the algal growth.…”

Section: Responses Of Cellular N C and Chl A To Different Nitrogen Scontrasting

confidence: 61%

Short-term effects of different nitrogen substrates on growth and toxin production of dinoflagellate Alexandrium catenella Balech (strain ACDH)

Zhou

2011

Harmful Algae

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“…UVB (290nm-320nm) radiation has raised concerns for its effects on marine ecosystems [23,24]. An increase in UVB can alter species composition and standing crop of microalgae [25][26][27]. Though, species with micosporin-like-aminoacids (MAA) cellular content are more tolerant to higher UVB levels [24,[28][29][30].…”

Section: Oceanography and Fisheries Open Access Journalmentioning

confidence: 99%

An Unusual and Massive Bloom of Tetraselmis Sp. in the Valparaiso Bay, Chile

Pizarro

2018

OFOAJ

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An intense bloom of Tetraselmis sp., producing strong water discoloration was observed from December 28th of 2005 through January 10th of 2006 in the Valparaiso Bay (32º 57'S; 71º 33'W). Blooms of Tetraselmis sp. have never been reported in this bay, or along the coast of Chile. The confluence of a series of environmental conditions observed before and during the bloom such as: high solar radiation, anomalous UV radiation levels, high sea surface temperatures, water stratification and high nutrient concentrations may have contributed to the development of this unique event.

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Ecophysiological strategies in response to UV-B radiation stress in cultures of temperate microalgae isolated from the Pacific coast of South America

Cited by 8 publications

References 0 publications

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶

Short-term effects of different nitrogen substrates on growth and toxin production of dinoflagellate Alexandrium catenella Balech (strain ACDH)

An Unusual and Massive Bloom of Tetraselmis Sp. in the Valparaiso Bay, Chile

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Ecophysiological strategies in response to UV-B radiation stress in cultures of temperate microalgae isolated from the Pacific coast of South America

Cited by 8 publications

References 0 publications

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina¶

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina¶

Short-term effects of different nitrogen substrates on growth and toxin production of dinoflagellate Alexandrium catenella Balech (strain ACDH)

An Unusual and Massive Bloom of Tetraselmis Sp. in the Valparaiso Bay, Chile

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Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶

Impact of Solar Ultraviolet Radiation on Marine Phytoplankton of Patagonia, Argentina^¶