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Coral Reefs

, Volume 30, Issue 3, pp 719–727 | Cite as

Effects of coral bleaching on the obligate coral-dwelling crab Trapezia cymodoce

Report

Abstract

Corals are an essential and threatened habitat for a diverse range of reef-associated animals. Episodes of coral bleaching are predicted to increase in frequency and intensity over coming decades, yet the effects of coral-host bleaching on the associated animal communities remain poorly understood. The present study investigated the effects of host-colony bleaching on the obligate coral-dwelling crab, Trapezia cymodoce, during a natural bleaching event in the lagoon of Lizard Island, Australia. Branching corals, which harbour the highest diversity of coral associates, comprised 13% of live coral cover at the study site, with 83% affected by bleaching. Crabs on healthy and bleached colonies of Pocillopora damicornis were monitored over a 5-week period to determine whether coral bleaching affected crab density and movement patterns. All coral colonies initially contained one breeding pair of crabs. There was a significant decline in crab density on bleached corals after 5 weeks, with many corals losing one or both crabs, yet all healthy colonies retained a mating pair. Fecundity of crabs collected from bleached and healthy colonies of P. damicornis was also compared. The size of egg clutches of crabs collected from bleached hosts was 40% smaller than those from healthy hosts, indicating a significant reduction in fecundity. A laboratory experiment on movement patterns found that host-colony bleaching also prompted crabs to emigrate in search of more suitable colonies. Emigrant crabs engaged in aggressive interactions with occupants of healthy hosts, with larger crabs always usurping occupants of a smaller size. Decreased densities and clutch sizes, along with increased competitive interactions, could potentially result in a population decline of these important coral associates with cascading effects on coral health.

Keywords

Climate change Coral-associated invertebrates Coral bleaching Competition Habitat degradation Habitat specialisation 

Notes

Acknowledgments

We thank B. Gordon, F. DeFaria, T. Z. Ang, C. Holland and the personnel of Lizard Island Research Station for their assistance in the field and Ray Berkelmans and the Australian Institute of Marine Science for sea surface temperature data. This study was supported by CSIRO Climate Adaptation Flagship, School of Marine and Tropical Biology at James Cook University and the ARC Centre of Excellence for Coral Reef Studies.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.ARC Centre of Excellence for Coral Reef Studies, and School of Marine and Tropical BiologyJames Cook UniversityTownsvilleAustralia
  2. 2.Climate Adaptation Flagship, CSIRO, HobartTasmaniaAustralia

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