The University of Southampton
University of Southampton Institutional Repository

The effects of grazing on the distribution and composition of low-shore algal communities on the central coast of Portugal and on the southern coast of Britain

Boaventura, Diana, Alexander, Matthew, Della Santina, Paolo, Smith, Nicholas D., Re, Pedro, Cancela da Fonseca, Luis and Hawkins, Stephen J. (2002) The effects of grazing on the distribution and composition of low-shore algal communities on the central coast of Portugal and on the southern coast of Britain Journal of Experimental Marine Biology and Ecology, 267, (2), pp. 185-206. (doi:10.1016/S0022-0981(01)00372-0).

Record type: Article

Abstract

A red algal turf is often found just below the barnacle/limpet zone of many European shores, especially on steep shores of moderate exposure. The hypothesis that grazing by limpets determines the upper limit of distribution of this red algal turf was tested on moderately exposed shores in Portugal and Britain. We also aimed to assess whether the grazing effect is modified at various spatial scales. Grazers were excluded by fences, with half-fenced and unfenced controls. Exclusion plots were rapidly colonised by green ephemeral algae in the months immediately after the beginning of the experiment (summer); these algae were later replaced by perennial algae. The percentage cover of turf-forming macroalgae showed a significant increase at both locations. The upper limit of distribution extended more than 50 cm on most of the shores studied. In contrast, control and half-fenced plots remained devoid of algae. After 2 years, ungrazed plots were mainly colonised by a red algal turf (e.g. Caulacanthus ustulatus, Gelidium spp., Laurencia pinnatifida) in Portugal, while canopy cover (Fucus serratus and Himanthalia elongata) dominated in Britain in marked contrast to the grazed plots. Physical factors acting at both local and geographical scales may explain these differences. However, although physical factors probably have an important influence on the identity, size and abundance of sublittoral fringe macroalgae, grazers play a major role in directly setting their upper limits. The effect of grazing by limpets was not consistent for all of the morphological algal groups and spatial scales considered in the present study. The effect of grazing on the cover of turf algae varied between Portugal and Britain (location scale), while effects on ephemeral and canopy algal cover varied at the shore scale within location.

Full text not available from this repository.

More information

Submitted date: 8 January 2001
Published date: 15 January 2002
Keywords: razing, macroalgae, upper limits, distribution patterns, intertidal, rocky shores

Identifiers

Local EPrints ID: 57888
URI: http://eprints.soton.ac.uk/id/eprint/57888
ISSN: 0022-0981
PURE UUID: 9e8bae4a-bd51-4c7b-b9ee-4da29a580b1e

Catalogue record

Date deposited: 11 Aug 2008
Last modified: 17 Jul 2017 14:28

Export record

Altmetrics

Contributors

Author: Diana Boaventura
Author: Matthew Alexander
Author: Paolo Della Santina
Author: Nicholas D. Smith
Author: Pedro Re
Author: Luis Cancela da Fonseca

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.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

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.

×