Hydrobiologia

, Volume 644, Issue 1, pp 401–405

Benthic community composition affects O2 availability and variability in a Northern Red Sea fringing reef

Short research note

DOI: 10.1007/s10750-010-0200-4

Cite this article as:
Niggl, W., Haas, A.F. & Wild, C. Hydrobiologia (2010) 644: 401. doi:10.1007/s10750-010-0200-4

Abstract

Many coral reef ecosystems experience shifts in benthic community composition from scleractinian corals to algae. However, consequences of such phase shifts on O2 availability, important for many reef organisms, are unresolved. This study therefore comparatively investigated potential in situ effects of different benthic cover by reef macroalgae and scleractinian corals on water column O2 concentrations in a Northern Red Sea fringing reef. Findings revealed that mean daily O2 concentrations at algae-dominated sites were significantly lower compared to coral-dominated sites. Minimum O2 concentrations were significantly negatively correlated, while diurnal variability in O2 concentration was significantly positively correlated, with increasing benthic cover by algae. In contrast, no correlation with coral cover was found. These results indicate that shifts from corals to benthic algae may likely affect both in situ O2 availability and variability. This may be particularly pronounced in reef systems with low water exchange (e.g. closed lagoons) or under calm weather conditions and suggests potential O2-mediated effects on reef organisms.

Keywords

O2 concentrationRed Sea coral reefSeasonal phase shiftBenthic community compositionHypoxia

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Wolfgang Niggl
    • 1
  • Andreas F. Haas
    • 1
  • Christian Wild
    • 1
  1. 1.Coral Reef Ecology Group (CORE), GeoBio-Center and Department of Earth and Environmental Science in the Faculty of GeosciencesLudwig-Maximilians UniversitätMunichGermany