Strong far-field coherent scattering of ultraviolet radiation by holococcolithophores

Quintero-Torres, Rafael; Aragón, J. L.; Torres, M.; Estrada, Marta; Cros, Lluïsa

doi:10.1103/physreve.74.032901

Cited by 39 publications

(27 citation statements)

References 15 publications

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“…Von Dassow et al (2009) showed for Emiliania huxleyi that transcript levels of genes whose products are involved in coccolithogenesis (Ca 2+ , H + and HCO 3 − transporters) are expressed much more in the diploid (heterococcolith) than in the haploid (holococcolith) phase which has non-calcified coccoliths. The few studies concerning environmental effects on holococcoliths (Quintero-Torres et al 2007, Fiorini et al 2011a, Pedrotti et al 2012 will be discussed in the relevant sections.…”

Section: Heterococcoliths and Holococcolithsmentioning

confidence: 99%

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Environmental controls on coccolithophore calcification

Raven

Crawfurd²

2012

Mar. Ecol. Prog. Ser.

116

107

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Coccolithophores are major contributors to global marine planktonic calcification, and in nature coccolithophores are invariably calcified through almost all of their life cycle. The response of calcification to environmental factors is essential in understanding the persistence of coccolithophores through at least 220 million years of changing global environments, and their prospects for current environmental change. So far the responses examined have been at the level of acclimation rather than adaptation in evolution. Variation in results of CO 2 manipulation experiments can be tentatively attributed to variation among genotypes rather than differences in experimental procedure. Comparisons of methods using the same genotype, and of several genotypes using a single method, suggest significant variation among genotypes. The general response is a decreased particulate inorganic carbon (PIC) to particulate organic carbon (POC) ratio in higher than present CO 2 concentrations and vice versa for lower CO 2 concentrations. Fewer studies have investigated the effect of other environmental factors. Decreased availability of phosphorus and, to a lesser extent, nitrogen, as well as decreasing photosynthetically active radiation (PAR) down to a certain low value increase PIC:POC, while variable results have been found for changes in ultraviolet radiation (UVR). Many of these results can be accommodated by considering the restriction of calcification to the G1 phase of the cell cycle and the length of this phase under different growth conditions. Fewer studies have investigated the interactions among environmental factors which change with increased CO 2 and increasing sea surface temperature; the shoaling of the thermocline will increase the mean PAR and UVR whilst decreasing nitrogen and phosphorus availability. More studies of these interactions, as well as of genetic adaptation in response to changed environmental factors, are needed.

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Section: Heterococcoliths and Holococcolithsmentioning

confidence: 99%

“…Holococcoliths have been much less studied; an exception is Quintero Torres et al (2007), who modelled the probable scattering of radiation by their structure. They found that this would cause greater scattering of radiation in the 200 to 300 and 700 to 900 nm ranges.…”

Section: Influence Of Ultraviolet Radiation On Calcificationmentioning

confidence: 99%

Environmental controls on coccolithophore calcification

Raven

Crawfurd²

2012

Mar. Ecol. Prog. Ser.

116

107

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“…These characteristics could have paleoceanographic implications and consequences in relation to ocean warming and the increasing acidification of the world oceans (Gibbs et al 2016). Estrada's interest in this phytoplankton group helped to show that some holococcolith structures (not present in all holococcoliths) can have the ability to scatter ultraviolet radiation (Quintero-Torres et al 2006), suggesting a possible strategy of increasing the reflection of UV light away from the cell, thus enhancing the ability of the organism to live higher in the water column. The studies in Mediterranean waters led to the description of a new coccolithophore, Picarola margalefii, dedicated to Ramon Margalef (Cros and Estrada 2004), which is now the symbol of the Margalef Award for Ecology (Fig.…”

Section: Insight Into the Taxonomy And Life Cycle Of Coccolithophoresmentioning

confidence: 99%

The ecology of plankton in biological oceanography: a tribute to Marta Estrada’s task

et al. 2016

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Summary:Plankton ecology has been the object of intense research and progress in the last few decades. This has been partly due to technological advances that have facilitated the multidisciplinary and high-resolution sampling of ecosystems and improved experimentation and analytical methodologies, and to sophisticated modelling. In addition, exceptional researchers have had the vision to integrate all these innovative tools to form a solid theoretical background in ecology. Here we provide an overview of the outstanding research work conducted by Professor Marta Estrada and her pioneering contribution to different areas of research in the last four decades. Her research in biological oceanography has mainly focussed on phytoplankton ecology, taxonomy and physiology, the functional structure of plankton communities, and physical and biological interactions in marine ecosystems. She has combined a variety of field and laboratory approaches and methodologies, from microscopy to satellite observations, including in-depth statistical data analysis and modelling. She has been a reference for scientists all over the world. Here, her contributions to plankton ecology are summarized by some of her students and closest collaborators, who had the privilege to share their science and everyday experiences with her.Keywords: phytoplankton ecology; taxonomy; functional structure of plankton communities; physical-biological interactions.La ecología del plancton en la oceanografía biológica: un homenaje a la labor de Marta Estrada Resumen: La ecología del plancton ha experimentado una intensa investigación y progreso en las últimas décadas. Esta se ha debido, en parte, a los avances tecnológicos que han facilitado la toma de muestras multidisciplinar y de alta resolución de los ecosistemas, la mejora de la experimentación y metodologías analíticas y el modelado matemático/numérico. El papel de investigadores excepcionales que han tenido la visión de integrar todas estas herramientas innovadoras a una sólida formación teórica en la ecología ha sido clave en este avance. A continuación hemos elaborado un resumen de la tarea de investigación llevada a cabo por la profesora Marta Estrada y su contribución pionera a diferentes áreas de investigación en las últimas cuatro décadas. Su investigación, en el marco de la oceanografía biológica, se ha centrado principalmente en la ecología del fitoplancton, su taxonomía y fisiología, la estructura funcional de las comunidades de plancton y las interacciones físicas y biológicas en los ecosistemas marinos. Ha combinado una variedad de enfoques y metodologías de campo y de laboratorio, desde observaciones por satélite, hasta el análisis en profundidad de datos estadísticos y el uso del modelado tanto analítico como numérico. La profesora Estrada ha sido una referencia para los científicos alrededor del mundo. Aquí, su contribución a la ecología del plancton la resumen algunos de sus alumnos y colaboradores más cercanos que han tenido el privilegio de compartir ciencia y vivencias con ella.Pa...

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“…UVR can decrease phytoplankton productivity through direct damage to proteins and DNA or indirectly through stimulation of oxidative stress . Several studies , using different degrees of calcification of coccolithophores obtained by a variety of methods, have suggested that coccoliths may play a protective role to keep cells from being damaged by high levels of UVR. Xu et al .…”

Section: Introductionmentioning

confidence: 99%

“…UVR can decrease phytoplankton productivity through direct damage to proteins and DNA (8) or indirectly through stimulation of oxidative stress (9). Several studies (10)(11)(12)(13), using different degrees of calcification of coccolithophores obtained by a variety of methods, have suggested that coccoliths may play a protective role to keep cells from being damaged by high levels of UVR. Xu et al obtained different levels of calcification by adjusting the Ca 2+ concentration (14), whereas Guan et al adjusted the dissolved inorganic carbon (DIC) concentration (15).…”

Section: Introductionmentioning

confidence: 99%

Calcification Moderates the Increased Susceptibility to UV Radiation of the Coccolithophorid Gephryocapsa oceanica Grown under Elevated CO₂ Concentration: Evidence Based on Calcified and Non‐calcified Cells

Miao

Beardall

Gao

2018

Photochem & Photobiology

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The physiological performance of calcified and non-calcified cells of Gephyrocapsa oceanica (NIES-1318) and their short-term responses to UV radiation were compared for cultures grown under present-day (LC, 400 μatm) and high pCO (HC, 1000 μatm) conditions. Similar growth rates and F /F values were observed in both types of cell under LC conditions, indicating that the loss of calcification in the non-calcified cells did not lead to a competitive disadvantage under such conditions. Detrimental effects of elevated pCO were observed in both cell types, with the growth rate of non-calcified cells decreasing more markedly, which might reflect a negative impact of higher cytoplasmic H . When exposed to short-term UV radiation, similar trends in effective quantum yield were observed in both cell types acclimated to LC conditions. Elevated pCO and associated seawater chemical changes strongly reduced effective quantum yield in non-calcified cells but no significant influence was observed in calcified cells. Based on these findings and comparisons with previous studies, we suggest that the negative impact of elevated cytoplasmic H would exacerbate the detrimental effects of UV radiation while the possession of calcification attenuated this influence.

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Strong far-field coherent scattering of ultraviolet radiation by holococcolithophores

Cited by 39 publications

References 15 publications

Environmental controls on coccolithophore calcification

Environmental controls on coccolithophore calcification

The ecology of plankton in biological oceanography: a tribute to Marta Estrada’s task

Calcification Moderates the Increased Susceptibility to UV Radiation of the Coccolithophorid Gephryocapsa oceanica Grown under Elevated CO₂ Concentration: Evidence Based on Calcified and Non‐calcified Cells

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Strong far-field coherent scattering of ultraviolet radiation by holococcolithophores

Cited by 39 publications

References 15 publications

Environmental controls on coccolithophore calcification

Environmental controls on coccolithophore calcification

The ecology of plankton in biological oceanography: a tribute to Marta Estrada’s task

Calcification Moderates the Increased Susceptibility to UV Radiation of the Coccolithophorid Gephryocapsa oceanica Grown under Elevated CO2 Concentration: Evidence Based on Calcified and Non‐calcified Cells

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Calcification Moderates the Increased Susceptibility to UV Radiation of the Coccolithophorid Gephryocapsa oceanica Grown under Elevated CO₂ Concentration: Evidence Based on Calcified and Non‐calcified Cells