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JPR Advance Access originally published online on March 15, 2009
Journal of Plankton Research 2009 31(6):619-634; doi:10.1093/plankt/fbp018
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Interactive effects of phosphorus loads and ambient ultraviolet radiation on the algal community in a high-mountain lake

Jose Antonio Delgado-Molina1, Presentación Carrillo2,*, Juan Manuel Medina-Sánchez1, Manuel Villar-Argaiz1 and Francisco José Bullejos1

1 Departamento Ecología, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain 2 Instituto del Agua, Universidad de Granada, 18071 Granada, Spain

* CORRESPONDING AUTHOR: pcl{at}ugr.es

Received on December 17, 2008; accepted on February 18, 2009


  Abstract

Interactions among multiple stressors generated by global change exert cumulative effects on ecosystems. In order to identify the long-term interactive effects of ultraviolet radiation (UVR) and increasing atmospheric nutrient inputs (P-inputs) on aggregate (growth rate, chlorophyll a and abundance) and emergent (evenness and diversity) algal community variables, a 2 x 5 factorial experiment [two levels of light quality (+UVR, –UVR) and five levels of nutrient enrichment] was conducted using in situ mesocosms in a high-mountain lake in the Sierra Nevada (Spain) over a 70-day period. Addition of P suppressed and inverted the stimulatory UVR effect on the non-flagellate growth rate (mid-term scale). This interactive effect was propagated as increased harmful UVR effect on chlorophyll a and abundance across the P-gradient. Interestingly, P-pulse reversed the positive effect of UVR on phytoplankton evenness and diversity on the long-term scale. These findings support our hypothesis that the UVR x P interactive effect would favor a few UVR-tolerant rapid-growing species. We show that the algal community is acclimated to UVR-flux but not to high P-pulse. The loss of diversity and disappearance of mixotrophic flagellates may have important implications for the functioning of clear-water ecosystems.

Corresponding editor: William Li


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