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JPR Advance Access originally published online on March 18, 2009
Journal of Plankton Research 2009 31(6):583-600; doi:10.1093/plankt/fbp019
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Responses of coastal osmotrophic planktonic communities to simulated events of turbulence and nutrient load throughout a year

Òscar Guadayol{dagger},*, Cèlia Marrasé, Francesc Peters, Elisa Berdalet, Cristina Roldán and Anna Sabata

Institut de Ciències del Mar (CSIC), Pg. Marítim de la Barceloneta 37–49, 08003 Barcelona, Catalonia, Spain

* CORRESPONDING AUTHOR: oscar{at}guadayol.cat

Received on November 17, 2008; accepted on February 22, 2009


  Abstract

A year-long series of monthly experiments with laboratory enclosures were conducted with water from Blanes Bay (NW Mediterranean) to analyse the change in the short-time response of the osmotrophic planktonic community to simulated turbulence and nutrient input events. Both experimental factors triggered a relative increase of biomass in the enclosures, in terms of chlorophyll a, bacteria and particulate organic matter. Ratios of particulate organic nitrogen to phosphorus became lower in the water than in the sediment, although turbulence partially smoothed out this difference. Initial physico-chemical conditions significantly influenced the short-time responses to experimental forcing. The response to turbulence, in terms of chlorophyll a, was maximum in spring. The response to nutrient enrichment was found to be seasonal, and was correlated with photoperiod and temperature, and also in situ nitrate and silicate concentrations and Secchi depth, which are proxies of recent inputs of nutrients resulting from episodes of resuspension and river discharge. This study shows robust qualitative regularities in the response of the osmotrophic planktonic community to episodes of turbulence and nutrient enrichment, with quantitative variability throughout the year, depending mostly on the recent record of hydrodynamic forcing.

{dagger} Present Address: College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331-5503, USA.

Corresponding editor: Roger Harris


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