Environmental tolerances of free-living coralline algae (maerl): implications for European marine conservation

Sian Wilson, Charmaine Blake, J.A. Berges, Christine Maggs

Research output: Contribution to journalArticle

140 Citations (Scopus)

Abstract

Maerl is a general term used for loose-lying subtidal beds of nodular coralline red algae. Maerl beds support high associated invertebrate and algal biodiversity, and are subject to European and UK conservation legislation. Previous investigations have shown European maerl to be ecologically fragile due to growth rates of approximately I mm per year. However, these very slow growth rates have hampered attempts to determine the key ecological requirements and sensitivity characteristics of living maerl. In this study, photosynthetic capacity determined by pulse amplitude modulated (PAM) fluorometry was used as a diagnostic of stress caused by various environmental conditions. Maerl species were exposed to a range of temperatures, salinities and light levels and to burial, fragmentation, desiccation and heavy metal treatment. Maerl was not as susceptible as previously assumed to extremes of salinity, temperature and heavy metal pollution, but burial, especially in fine or anoxic sediments, was lethal or caused significant stress. These data indicate that the main anthropogenic hazard for live maerl and the rich communities that depend on them is smothering by fine sediment, such as that produced by trawling or maerl extraction, from sewage discharges or shellfish and fish farm waste, and sedimentation resulting from disruption to tidal flow. (C) 2004 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)279-289
Number of pages11
JournalBiological Conservation
Volume120
Issue number2
DOIs
Publication statusPublished - Nov 2004

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

Fingerprint Dive into the research topics of 'Environmental tolerances of free-living coralline algae (maerl): implications for European marine conservation'. Together they form a unique fingerprint.

  • Impacts

    Conservation of Maerl (Calcareous red seaweed) in Europe

    Daryl Birkett (Participant), Christine Maggs (Participant), Matthew Dring (Participant), Charmaine Blake (Participant), Sian Wilson (Participant), Paula Reimer (Participant) & Mark Johnson (Participant)

    Impact: Public Policy Impact, Environmental Impact

    Cite this