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• W2182303502 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 535:47-61 (2015) - DOI: https://doi.org/10.3354/meps11414 Effect of solar UVR on the production of particulate and dissolved organic carbon from phytoplankton assemblages in the Indian Ocean Antonio Fuentes-Lema1,*, Cristina Sobrino1, Natalia González2, Marta Estrada3, Patrick J. Neale4 1Department of Ecology and Animal Biology, University of Vigo, 36310 Vigo, Spain 2Department of Biology and Geology, Rey Juan Carlos University, 28933 Madrid, Spain 3Department of Marine Biology and Oceanography, Institut de Ciències del Mar (CSIC), 08003 Barcelona, Spain 4Smithsonian Environmental Research Center, PO Box 28, Edgewater, MD 21037, USA *Corresponding author: antonio.fuentes@uvigo.es ABSTRACT: This study shows the effects of solar UVR on the photosynthetic parameters and the production of both particulate and dissolved organic carbon (POC and DOC, respectively) of phytoplankton assemblages from oligotrophic areas of the southeastern Indian Ocean. Samples from the 20% PAR depth were incubated on deck under different intensities of 2 different light regimes: full solar radiation (PAR+UVR) and excluding UVR (PAR). Phytoplankton production was measured by the 14C method, obtaining size-fractionated POC (0.2, 2 and 20 µm), total POC and DOC. POC values were fit to a photosynthesis-irradiance (P-E) model that includes photoinhibition. Phytoplankton populations under PAR+UVR had a 10% lower maximum photosynthetic rate (PsB) and an 86% higher sensitivity to inhibition (β) than populations incubated under only PAR exposures. For some stations, cells larger than 2 µm showed higher PsB and photosynthetic efficiency (measured as the P-E slope, α) than smaller cells, but no significant differences were found for β. In contrast, DOC production was significantly higher under PAR+UVR than under PAR exposures and did not follow the P-E model used for fitting POC. The analysis of the P-E values for DOC production showed that values remained constant under PAR intensities but increased with increasing irradiance in the presence of UVR. In some cases, inhibition of DOC production at high irradiances was also observed. These results demonstrate the relevance of UVR irradiance as an environmental driver for phytoplanktonic DOC production in oligotrophic waters and reinforce the important role of UVR on the physiology and ecology of tropical plankton. KEY WORDS: Ultraviolet radiation · Phytoplankton · POC · DOC · P-E curve · Photoinhibition · Indian Ocean Full text in pdf format PreviousNextCite this article as: Fuentes‑Lema A, Sobrino C, González N, Estrada M, Neale PJ (2015) Effect of solar UVR on the production of particulate and dissolved organic carbon from phytoplankton assemblages in the Indian Ocean. Mar Ecol Prog Ser 535:47-61. https://doi.org/10.3354/meps11414 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 535. Online publication date: September 15, 2015 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2015 Inter-Research." @default.
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• W2182303502 title "Effect of solar UVR on the production of particulate and dissolved organic carbon from phytoplankton assemblages in the Indian Ocean" @default.
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