References

Biogeosciences

1726-4189

Copernicus Publications

Göttingen, Germany

10.5194/bg-9-1267-2012

Experimental assessment of the effect of UVB radiation on plankton community metabolism along the Southeastern Pacific off Chile

Godoy

¹ ³ Canepa

¹ Lasternas

² Mayol

¹ ² Ruíz-Halpern

² Agustí

² ⁴ Castilla

J. C.

¹ ³ Duarte

C. M.

² ⁵

LINCGlobal, CSIC-PUC, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile

Department of Global Change Research, IMEDEA, CSIC-UIB, Miquel Marqués 21, 07190 Esporles, Mallorca, Spain

ECIM, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Alameda 340, Santiago, Chile

The UWA Oceans Institute and School of Plant Biology, MBD: M470, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia

The UWA Oceans Institute, MBD: M470, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia

02 04 2012

9 4 1267 1276

2012

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://bg.copernicus.org/articles/9/1267/2012/bg-9-1267-2012.html

The full text article is available as a PDF file from https://bg.copernicus.org/articles/9/1267/2012/bg-9-1267-2012.pdf

The potential effects of UV on community metabolism (NCP, GPP and R) were assessed along the Southeast Pacific off the Chilean coast during the Humbold-2009 cruise (54.80° S–23.85° S) on board R/V Hespérides from 5 to 15 March 2009. Estimates of community metabolism were performed at eight stations, including three stations on Patagonian fjords and five stations on the Humboldt Current System. The effect of UVB radiation on net community production (NCP) was evaluated at the stations in the Humboldt Current system by comparing metabolic rates derived using quartz bottles, largely transparent to UVB, and borosilicate glass, which is opaque to UVB and part of UVA, incubated under the ambient solar radiation. Autotrophic planktonic communities with variable NCP prevailed along the area, with the highest NCP rates (7.1–11.1 mmol O2 m−3 d−1) observed in the Patagonian fjords and the northernmost station. All five experiments showed significantly different NCP rates between communities incubated under the full ambient radiation and those incubated under reduced UVB. One of the experiments showed elevated NCP when the community was exposed to the full solar radiation, while four experiments showed a significantly lower NCP in the presence of UVB. These results suggest that the intense UVB radiation in this area, partly inhibits NCP in the Southwest Pacific off Chile.

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