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JPR Advance Access published online on December 5, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm104
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Microbial dynamics during the decline of a spring diatom bloom in the Northeast Atlantic

Carole A. Llewellyn1,*, Glen A. Tarran1, Chris P. Galliene1, Denise G. Cummings1, Alex De Menezes2, Andy P. Rees1, Jo L. Dixon1, Claire E. Widdicombe1, Elaine S. Fileman1 and Willie H. Wilson3

1 Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth Pl1-3Dh, United Kingdom 2 School Of Biological Sciences, University Of Liverpool, P.O. Box 147, Liverpool, L69-3Bx, United Kingdom 3 Bigelow Laboratory For Ocean Sciences, 180 Mckown Point Road, Pob 475, Maine 04575, USA

* Corresponding author: call{at}pml.ac.uk

Received on July 16, 2007; revised on October 18, 2007; accepted on November 29, 2007


  Abstract

The microbial dynamics during a spring diatom bloom decline was monitored in the Northeast Atlantic during a five day Lagrangian study (8 - 12th April 2002). Phytoplankton abundance, composition and health status were related to viral and bacterial abundance, zooplankton abundance and grazing rates, and bacterial production. Phytoplankton reached maximum concentrations on Day 3 (Chl-a > 5 µg L–1) and declined on Day 5 (Chl-a ~2 µg L–1) and was dominated (70% of Chl-a) by diatoms. Bacterial production increased substantially to>20 µg C L–1 d–1 on Day 3 and concomitantly large viruses decreased in number by half to < 10 x 103 mL–1. This was followed by a five fold increase in large viruses on Day 5 indicating infection and subsequent lysis on Days 3 and 5 respectively. Micro- and mesozooplankton grazing were not the principal cause for the decline of the bloom and pheophorbide-a showing little variation in concentration from Days 1 to 4 (approx 100 ng L–1) although doubled on Day 5. The poor physiological status of the diatoms, indicated by the high chlorophyllide-a concentrations (50 - 480 ng L–1), likely promoted a series of closely interrelated events involving bacteria and viruses leading to the demise of the diatom bloom.

Key Words: Bloom • Diatoms • Microbes • Pigments

Communicating editor: Kevin J Flynn


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