Cell Size-Dependent Effects of Solar UV Radiation on Primary Production in Coastal Waters of the South China Sea

Li, Gang; Gao, Kunshan

doi:10.1007/s12237-013-9591-6

Cited by 32 publications

(15 citation statements)

References 39 publications

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“…Likewise, the vulnerability of microalgae to UVR damage may be dependent on cell size, which determines light absorption properties (Agustí, 1991). Photosynthetic carbon fixation of small phytoplankton species was reported to be much more sensitive to UVB radiation than that of large species in a coastal ecosystem (Li and Gao, 2013), and a recent laboratory study also revealed that the UVB sensitivity of diatoms decreased with increasing cell size (Wu et al, 2015). Small cells are also vulnerable to the accumulation of cyclobutane pyrimidine dimers but photosynthesis is less inhibited by UVB radiation, which may be caused by faster photo-repair in small cells (Buma et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Contrasting Responses of Marine and Freshwater Photosynthetic Organisms to UVB Radiation: A Meta-Analysis

2017

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Ultraviolet-B (UVB) radiation is a global stressor that has profound impacts on freshwater and marine ecosystems. However, an analysis of the patterns of sensitivity to UVB radiation across aquatic photosynthetic organisms has not yet been published. Here, we performed a meta-analysis on results reported in 214 studies compiled from the published literature to quantify and compare the magnitude of responses of aquatic photosynthetic organisms to changes in UVB radiation. The meta-analysis was conducted on observations of marine (n = 893) and freshwater macroalgae (n = 126) and of marine (n = 1,087) and freshwater (n = 2,889) microalgae (total n = 4,995). Most of these studies (85%) analyzed the performance of organisms exposed to natural solar radiation when UVB was partially or totally reduced compared with the organismal performance under the full solar radiation spectrum, whereas the remaining 15% of the studies examined the responses of organisms to elevated UVB radiation mostly using artificial lamps. We found that marine photosynthetic organisms tend to be more sensitive than freshwater photosynthetic organisms to UVB radiation; responses to either decreased or increased UVB radiation vary among taxa; the mortality rate is the most sensitive of the trait responses to elevated UVB radiation, followed by changes in cellular and molecular traits; the sensitivity of microalgae to UVB radiation is dependent on size, with small-celled microalgae more sensitive than large-celled microalgae to UVB radiation. Thick macroalgae morphotypes were the less sensitive to UVB, but this effect could not be separated from phylogenetic differences. The high sensitivity of marine species, particularly the smallest photosynthetic organisms, to increased UVB radiation suggests that the oligotrophic ocean, a habitat comprising 70% of the world's oceans with high UVB penetration and dominated by picoautotrophs, is extremely vulnerable to changes in UVB radiation.

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Section: Introductionmentioning

confidence: 99%

Contrasting Responses of Marine and Freshwater Photosynthetic Organisms to UVB Radiation: A Meta-Analysis

2017

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“…UVR can decrease phytoplankton growth and photosynthesis as well as nutrients uptake (Sobrino et al 2004, Gao et al 2007a, Korbee et al 2010, harm DNA or protein molecules (Roy 2000, Wei et al 2004 and even lead to cell death (Agustí and Llabrés 2007), and therefore, can alter community structures (Marcoval et al 2008, Beardall et al 2009). On the other hand, longer UV-A wavebands (320-400 nm) are known to function in photorepairing the UV-B induced damages to DNA (Buma et al 2003), trigger chlorophyll fluorescence (Halldal 1967) and energize the photosynthesis of coastal phytoplankton assemblages (Helbling et al 2003, Mengelt and Prézelin 2005, Gao et al 2007b, Li and Gao 2013.…”

Section: Introductionmentioning

confidence: 99%

Effects of solar UV radiation on photosynthetic performance of the diatom Skeletonema costatum grown under nitrate limited condition

Li¹,

Gao²

2014

ALGAE

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Availability of nutrients is known to influence marine primary production; and it is of general interest to see how nutrient limitation mediates phytoplankton responses to solar ultraviolet radiation (UVR, 280-400 nm). The red tide diatom Skeletonema costatum was cultured under nitrate (N)-limited and N-replete conditions and exposed to different solar irradiation treatments with or without UV-A (315-400 nm) and UV-B (280-315 nm) radiation. Its photochemical quantum yield decreased by 13.6% in N-limited cells as compared to that in N-replete ones under photosynthetically active radiation (PAR)-alone treatment, and the presence of UV-A or UV-B decreased the yield further by 2.8 and 3.1%, respectively. The non-photochemical quenching (NPQ), when the cells were exposed to stressful light condition, was higher in N-limited than in N-replete grown cells by 180% under PAR alone, by 204% under PAR + UV-A and by 76% under PAR + UV-A + UV-B treatments. Our results indicate that the N limitation exacerbates the UVR effects on the S. costatum photosynthetic performance and stimulate its NPQ.

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“…Phytoplankton species (especially those in the upper mixing layer), while utilizing light energy for photosynthesis, are also exposed to UVR that is known to reduce their growth, photosynthesis and calcification, damage DNA or D1 protein and pigments (Helbling et al 1992, Buma et al 2003, Bouchard et al 2005, Gao et al 2009. Moderate levels of UV radiation A (UVA, 315-400 nm) also have positive effects, such as photo-repair of UV radiation B (UVB)-damaged DNA (Buma et al 2003) and stimulate photosynthetic CO 2 -fixation at low photosynthetically active radiation (PAR) (Mengelt andPrézelin 2005, Li et al 2011) or at PAR absence conditions (Gao et al 2007, Li andGao 2013). Mixing that moves phytoplankton up and down the water column causes fluctuation of the levels of solar radiation, enhancing non-photochemical quenching (Milligan et al 2012) and lowering synthesis of UV-screening compounds (e.g., mycosporine-like amino acids [MAAs]) (Hernando et al 2006), and also mitigating the negative effects of UVR (Neale et al 1998).…”

Section: Environmental Measurementsmentioning

confidence: 99%

“…Following this insight, extensive studies were conducted on these coral reefs (e.g., Li et al 2008, Dong et al 2009, Huang et al 2011, Hughes et al 2012; however, rather less attention was paid to phytoplankton in these coral reef waters (Zhang et al 2009, Shen et al 2010, Li and Gao 2013. As a habitat sharing counterpart to corals, phytoplankton may indirectly affect the survival of corals (discussed earlier); in view of this point, it is essential to evaluate the physiological effects of environments on these organisms.…”

Section: Environmental Measurementsmentioning

confidence: 99%

Photosynthetic carbon fixation by tropical coral reef phytoplankton assemblages: a UVR perspective

Li¹,

Che²,

Gao³

2013

ALGAE

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Photosynthetic carbon fixation regulates air-sea CO 2 fluxes in the waters of coral reefs. However, little has been documented on the effects of solar UV radiation (UVR, 280-400 nm) upon photosynthetic behaviors of phytoplankton dwelling in these ecosystems. In order to evaluate the aforesaid, surface dwelling tropical coral reef phytoplankton assemblages collected from the South China Sea were exposed to solar radiation (i.e., photosynthetically active radiation [PAR] + UV radiation A [UVA] + UV radiation B [UVB], 280-700 nm; PAR + UVA, 320-700 nm; and PAR, 400-700 nm) under static or simulated-mixing conditions. Under the static condition, UVA and UVB significantly reduced the carbon fixation with the maximum of 22.4 and 15.3%, respectively; while lower UVR-related photosynthetic inhibition was observed in case of phytoplankton samples being subjected to mixing. At a moderate level of mixing (i.e., circulation time 80 min), the UVA and UVB caused inhibition were lowered by 52.1 and 79.6%, respectively. Based on this it could be stated that vertical mixing induced by winds and/or tides in the natural environments could reduce the inhibitory effect of solar UVR on phytoplankton productivity in the coral reefs water.

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Cell Size-Dependent Effects of Solar UV Radiation on Primary Production in Coastal Waters of the South China Sea

Cited by 32 publications

References 39 publications

Contrasting Responses of Marine and Freshwater Photosynthetic Organisms to UVB Radiation: A Meta-Analysis

Contrasting Responses of Marine and Freshwater Photosynthetic Organisms to UVB Radiation: A Meta-Analysis

Effects of solar UV radiation on photosynthetic performance of the diatom Skeletonema costatum grown under nitrate limited condition

Photosynthetic carbon fixation by tropical coral reef phytoplankton assemblages: a UVR perspective

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