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    Effects of UVB radiation on net community production in the upper global ocean

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    Type
    Article
    Authors
    Garcia-Corral, Lara S. cc
    Holding, Johnna M.
    Carrillo-de-Albornoz, Paloma cc
    Steckbauer, Alexandra
    Pérez-Lorenzo, María
    Navarro, Nuria
    Serret, Pablo
    Duarte, Carlos M. cc
    Agusti, Susana cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2016-08-31
    Online Publication Date
    2016-08-31
    Print Publication Date
    2017-01
    Permanent link to this record
    http://hdl.handle.net/10754/622539
    
    Metadata
    Show full item record
    Abstract
    Aim Erosion of the stratospheric ozone layer together with oligotrophication of the subtropical ocean is leading to enhanced exposure to ultraviolet B (UVB) radiation in ocean surface waters. The impact of increased exposure to UVB on planktonic primary producers and heterotrophs is uncertain. Here we test the null hypothesis that net community production (NCP) of plankton communities in surface waters of the tropical and subtropical ocean is not affected by ambient UVB radiation and extend this test to the global ocean, including the polar oceans and the Mediterranean Sea using previous results. Location We conducted experiments with 131 surface communities sampled during a circumnavigation cruise along the tropical and subtropical ocean and combined these results with 89 previous reports encompassing the Atlantic, Pacific, Arctic and Southern Oceans and the Mediterranean Sea. Methods The use of quartz (transparent to UVB radiation) and borosilicate glass materials (opaque to most UVB) for incubations allowed us to compare NCP between communities where UVB is excluded and those receiving natural UVB radiation. Results We found that NCP varies when exposed to natural UVB radiation compared to those where UVB was removed. NCP of autotrophic communities tended to decrease under natural UVB radiation, whereas the NCP of heterotrophic communities tended to increase. However, these variations showed the opposite trend under higher levels of UVB radiation. Main conclusions Our results suggest that earlier estimates of NCP for surface communities, which were hitherto derived using materials blocking UVB radiation were biased, with the direction and magnitude of this bias depending on the metabolic status of the communities and the underwater penetration of UVB radiation.
    Citation
    Garcia-Corral LS, Holding JM, Carrillo-de-Albornoz P, Steckbauer A, Pérez-Lorenzo M, et al. (2016) Effects of UVB radiation on net community production in the upper global ocean. Global Ecology and Biogeography 26: 54–64. Available: http://dx.doi.org/10.1111/geb.12513.
    Sponsors
    This is a contribution to the Malaspina Expedition 2010, funded by the INGENIO 2010 CONSOLIDER programme (ref. CDS2008-00077) of the Spanish Ministry of Economy and Competitiveness. We thank the captain and the crew of R/V Hesperides and the UTM for their help onboard and technical support. We also want to thank A. M. Cabello, P. Rial, M. Estrada, M. Latasa, F. Rodrıguez and P. Mozetic for providing chlorophyll-a data, J. M. Gasol and X. A. G. Moran for provid- ing HPA data, E. Fraile-Nuez and V. Benıtez-Barrios for their work analysing the CTD data and all the Malaspina Expedition participants for their support. L.S.G.-C. was supported by a JAE Pre-doc fellowship from the Spanish National Research Council (CSIC) and the BBVA Foundation, Spain.
    Publisher
    Wiley
    Journal
    Global Ecology and Biogeography
    DOI
    10.1111/geb.12513
    Additional Links
    http://onlinelibrary.wiley.com/doi/10.1111/geb.12513
    ae974a485f413a2113503eed53cd6c53
    10.1111/geb.12513
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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