Cryptofauna of the epilithic algal matrix on an inshore coral reef, Great Barrier Reef

Kramer, M.J.;Bellwood, D.R.;Bellwood, O.

Abstract

Composed of a collection of algae, detritus, sediment and invertebrates, the epilithic algal matrix (EAM) is an abundant and ubiquitous feature of coral reefs. Despite its prevalence, there is a paucity of information regarding its associated invertebrate fauna. The cryptofaunal invertebrate community of the EAM was quantitatively investigated in Pioneer Bay on Orpheus Island, Great Barrier Reef. Using a vacuum collection method, a diversity of organisms representing 10 different phyla were identified. Crustacea dominated the samples, with harpacticoid copepods being particularly abundant (2025 ± 132 100 cm⁻²; mean density ± SE). The volume of coarse particulate matter in the EAM was strongly correlated with the abundance of harpacticoid copepods. The estimated biomass of harpacticoid copepods (0.48 ± 0.05 g m⁻²; wet weight) suggests that this group is likely to be important for reef trophodynamics and nutrient cycling.

Journal

Coral Reefs

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1432-0975

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Springer

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DOI

10.1007/s00338-012-0924-x