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JPR Advance Access published online on May 27, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn059
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Dynamics of phosphorus in the Venice lagoon during a picocyanobacteria bloom

Yu.I. Sorokin1,3,* and F. Dallocchio2

1 Ca'Foscari University of Venice, Campo Santa Marta2137, Venice, 30123, Italy 2 Departamento di Biochimica e Biologia Molecolare, Universita di Ferrara, Via Borsari 46, Ferrara, Italy 3 Shirshov Oceanology Institute of RAS (Southern branch), Gelendzhik, Kransnodar district, 353467, Russia

* Corresponding author (present address): Shirshov Oceanology Institute of RAS (Southern branch), Gelendzhik, Kransnodar district, 353467, Russia. e-mail: sorokina{at}sbsio.coast.ru

Received on March 8, 2008; revised on May 23, 2008; accepted on May 26, 2008


  Abstract

The lagoon of Venice experienced dense blooms of picocyanobacteria in the summer of summer 2001. The dynamics of soluble reactive inorganic phosphorus (DIP) was studied in these blooms in the lagoon. DIP uptake and regeneration rates were measured in situ using a 32P-radiotracer. DIP content remained high even during the bloom (0.2 to 0.7 µM), at Ptot concentrations from 4 to 8 µM. The DIP uptake rate by microplankton varied between 20 and 73 nM min–1, depending mainly on the bloom density. The DIP residence time varied from 5 to 20 min, while in the waters of the coastal Adriatic, where picocyanobacteria were also present, it was 2.5 hours. The DIP regeneration rate varied from 18 to 59 nM min–1. The picocyanobacterial bloom assemblage was able to consume and to store in its biomass up to 10 µM of phosphorus in the samples of lagoon water enriched with DIP at up to 17 µM.

The results demonstrate the capability of picocyanobacterial blooms to recycle DIP rapidly and to accumulate high stocks of phosphorus in their biomass. This feature of their physiology enables assemblages of picocyanobacteria to produce dense blooms in shallow marine basins experiencing the impact of eutrophication.

Key Words: picocyanobacterial bloom • phosphorus dynamics

Communicating Editor: Dr John Dolan


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