Coral Reefs

, Volume 34, Issue 1, pp 13–16 | Cite as

Defended territories of an aggressive damselfish contain lower juvenile coral density than adjacent non-defended areas on Kenyan lagoon patch reefs

  • T. A. C. Gordon
  • B. Cowburn
  • R. D. Sluka


Jewel damselfish, Plectroglyphidodon lacrymatus, aggressively defend small territories on coral reefs in which they cultivate lawns of edible macroalgae. Pairwise frequency counts showed that juvenile coral density was lower inside damselfish territories than that in adjacent non-defended areas on lagoon patch reefs in Kenya. These differences in coral density decreased as coral size increased. Direct farming effects of the damselfish and indirect inhibitory effects from higher algal densities inside territories are both thought to be potentially responsible for the results attained herein. Damselfish territories can occupy a large proportion of a coral reef; territorial behaviour in fish may have greater impacts on reef structure, in particular the resilience and growth rate of juvenile corals, than previously appreciated.


Coral density Coral reef resilience Damselfish Farming Juvenile coral Territoriality 



We thank Professor William Sutherland for his helpful comments on previous drafts of the manuscript. We thank all who assisted in fieldwork, in particular Peter Musembi and Sofi Kosimbei of A Rocha Kenya. We thank the Kenya Wildlife Service for their cooperation during our work in the Watamu Marine National Park, and the Christ’s College Bursary Scheme, the Henry Martyn Trust, and the Timios Trust for helping to fund this work.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • T. A. C. Gordon
    • 1
    • 2
  • B. Cowburn
    • 1
    • 3
  • R. D. Sluka
    • 1
    • 4
  1. 1.A Rocha Kenya Marine Conservation and Research ProgrammeWatamuKenya
  2. 2.Christ’s CollegeUniversity of CambridgeCambridgeUK
  3. 3.Department of ZoologyUniversity of OxfordOxfordUK
  4. 4.A Rocha InternationalCambridgeUK

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