The University of Southampton
University of Southampton Institutional Repository

Patterns of phytoplankton size structure and productivity in contrasting open-ocean environments

Maranon, E., Holligan, P.M., Barciela, R., Gonzalez, N., Mourino, B., Pazo, M.J. and Varela, M. (2001) Patterns of phytoplankton size structure and productivity in contrasting open-ocean environments Marine Ecology Progress Series, 216, pp. 43-56. (doi:10.3354/meps216043).

Record type: Article


A total of 94 vertical profiles of size-fractionated chlorophyll a concentration and primary production rate were obtained along a meridional transect from the United Kingdom to the Falkland Islands (50°N to 50°S) during 4 cruises carried out in April and October 1996 and in April and October 1997. This data set allowed us to characterize the patterns of phytoplankton size-structure and productivity in temperate, oligotrophic, upwelling and equatorial regions. On average, picophytoplankton (0.2 to 2 µm) accounted for 56 and 71% of the total integrated carbon (C) fixation and autotrophic biomass, respectively. Enhanced biomass and productivity contributions by nano- and microplankton took place in the temperate regions and in the upwelling area off Mauritania. Small (<2 µm in diameter) phytoplankton cells should not be regarded as a background, relatively invariant component of the microbial community, given that most of the latitudinal variability in total photoautotrophic biomass and production was driven by changes in the picophytoplankton. In temperate regions and in the upwelling area off Mauritania, small (<2 µm) and large (>2 µm) phytoplankton accounted for a proportion of total biomass that was similar to their shares of productivity. In the oligotrophic and equatorial regions, in contrast, large phytoplankton tended to account for a fraction of the total production that was significantly higher than their share of the biomass. We found that the equatorial upwelling causes an increase in phytoplankton biomass and productivity without altering the typical size structure found in less productive regions such as the subtropical gyres. In the oligotrophic ocean, significant changes in C fixation rates take place without accompanying variations in the magnitude of the phytoplankton standing stocks or the size structure of the microbial community.

Full text not available from this repository.

More information

Published date: 2001
Organisations: Ocean and Earth Science


Local EPrints ID: 7971
PURE UUID: bedb4c99-9d48-4897-8f2f-1f33f564094e

Catalogue record

Date deposited: 17 Aug 2004
Last modified: 17 Jul 2017 17:13

Export record



Author: E. Maranon
Author: P.M. Holligan
Author: R. Barciela
Author: N. Gonzalez
Author: B. Mourino
Author: M.J. Pazo
Author: M. Varela

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.