, 637:249 | Cite as

A remarkable case of fiddler crab, Uca spp., alpha diversity in Wallacea

Short research note


A preliminary attempt was made to quantify the alpha diversity of fiddler crabs (Uca spp.) along a short transect across the interface between an intertidal mudflat and a largely Avicennia mangrove at Ambeua on the Indonesian island of Kaledupa in Sulawesi Tenggara, by means of visual counts within 2 m2 quadrats. An astounding diversity of up to six seemingly coexisting species per quadrat—and a total of seven such species within an area of 4 m2—was revealed. Four species of the ecologically equivalent sentinel crabs (Macrophthalmus) were also present in the quadrats. Seven fiddler crab species equates to more than half those known from Wallacea, more than one-third of all those known from Indonesia, and almost one-fifth of the entire Uca fauna of the Indo-West-Pacific.


Biodiversity Brachyura Coexistence Indonesia Mudflat Wallacea 



These observations were made whilst holding Research Permit No. 165 from Kementerian Negara Riset dan Teknologi, to whom I am most grateful for permission to carry out research in Indonesia. I would also like to thank the Coral Reef Research Unit (University of Essex) and Operation Wallacea for financial support, Lembaga Alam Mitra Wakatobi for use of their facilities including boat transport, Amy Exton for Research Assistance, Ian Hendy for levelling the transect, and Anna Barnes for general help.


  1. Abrams, P., 1983. The theory of limiting similarity. Annual Review of Ecology & Systematics 14: 359–376.CrossRefGoogle Scholar
  2. Beinlich, B. & H. O. von Hagen, 2006. Materials for a more stable subdivision of the genus Uca Leach. Zoologische Mededelingen. Leiden 80(4): 9–32.Google Scholar
  3. Crane, J., 1975. Fiddler Crabs of the World. Princeton University Press, Princeton, NJ.Google Scholar
  4. George, R. W. & D. S. Jones, 1982. A revision of the fiddler crabs of Australia (Ocypodinae: Uca). Records of the Western Australian Museum, Suppl 14: 1–99.Google Scholar
  5. Haig, J., 1984. Land and freshwater crabs of the Seychelles and neighbouring islands. In Stoddart, D. R. (ed.), Biogeography and Ecology of the Seychelles Islands. Junk, The Hague: 123–139.Google Scholar
  6. Horton, B. P., Y. Zong, C. Hillier & S. Engelhart, 2007. Diatoms from Indonesian mangroves and their suitability as sea-level indicators for tropical environments. Marine Micropaleontology 63: 155–168.CrossRefGoogle Scholar
  7. Icely, J. D. & D. A. Jones, 1978. Factors affecting the distribution of the genus Uca (Crustacea: Ocypodidae) on an East African shore. Estuarine & Coastal Marine Science 6: 315–325.CrossRefGoogle Scholar
  8. Jordâo, J. M. & R. F. Oliviera, 2003. Comparison of non-invasive methods for quantifying population density of the fiddler crab Uca tangeri. Journal of the Marine Biological Association of the UK 83: 981–982.CrossRefGoogle Scholar
  9. Koch, V., M. Wolff & K. Diele, 2005. Comparative population dynamics of four fiddler crabs (Ocypodidae, genus Uca) from a north Brazilian mangrove ecosystem. Marine Ecology Progress Series 291: 177–188.CrossRefGoogle Scholar
  10. Kwok, W. P. W. & W.-S. Tang, 2006. Fiddler crabs in Hong Kong—an overview. Hong Kong Biodiversity 12: 1–7.Google Scholar
  11. Macia, A., I. Quincardete & J. Paula, 2001. A comparison of alternative methods for estimating population density of the fiddler crab Uca annulipes at Saco Mangrove, Inhaca Island (Mozambique). Hydrobiologia 449: 213–219.CrossRefGoogle Scholar
  12. Macnae, W., 1968. A general account of the fauna and flora of mangrove swamps and forests in the Indo-West Pacific region. Advances in Marine Biology 6: 1–270.Google Scholar
  13. Miller, D. C., 1961. The feeding mechanism of fiddler crabs (Uca pugilator, U. pugnax and U. minax), with ecological considerations of feeding adaptations. Zoologica 46: 89–100.Google Scholar
  14. Moosa, M. K. & I. Aswandy, 1983. The distribution of ocypodid crabs of the genus Uca in the Sunda Strait (Crustacea, Decapoda, Ocypodidae). Proceedings of the Symposium on 100 Years of Development of Krakatau and its Surroundings. Indonesian Institute of Sciences, Jakarta.Google Scholar
  15. Ng, P. K. L., D. Guinot & P. J. F. Davie, 2008. Systema brachyurorum: Part 1. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology 17: 1–286.Google Scholar
  16. Nobbs, M. & K. A. McGuinness, 1999. Developing methods for quantifying the apparent abundance of fiddler crabs (Ocypodidae: Uca) in mangrove habitats. Australian Journal of Ecology 24: 43–49.CrossRefGoogle Scholar
  17. Ono, Y., 1965. On the ecological distribution of ocypodid crabs in the estuary. Memoirs of the Faculty of Science of Kyushu University (E, Biology) 4: 1–60.Google Scholar
  18. Rosenberg, M. S., 2001. The systematics and taxonomy of fiddler crabs: a phylogeny of the genus Uca. Journal of Crustacean Biology 21: 839–869.CrossRefGoogle Scholar
  19. Rosenberg, M. S. 2007. Fiddler crabs (genus Uca). www.fiddlercrabs.info.
  20. Sakai, K. (ed.), 2004. Crabs of Japan, World Biodiversity Database CD-ROM. Expert Centre for Taxonomic Identification, Amsterdam.Google Scholar
  21. Schuwerack, P.-M. M., R. S. K. Barnes, G. J. C. Underwood & P. W. Jones, 2006. Gender and species differences in sentinel crab (Macrophthalmus) feeding on an Indonesian mudflat. Journal of Crustacean Biology 26: 119–123.CrossRefGoogle Scholar
  22. Shin, P. K. S., M. W. Yiu & S. G. Cheung, 2004. Behavioural adaptations of the fiddler crabs Uca vocans borealis (Crane) and Uca lacteal lactea (de Haan) for coexistence on an intertidal shore. Marine & Freshwater Behaviour & Physiology 37: 147–160.CrossRefGoogle Scholar
  23. Skov, M. W. & R. G. Hartnoll, 2001. Comparative suitability of binocular observation, burrow counting and excavation for the quantification of the mangrove fiddler crab Uca annulipes (H Milne Edwards). Hydrobiologia 449: 201–212.CrossRefGoogle Scholar
  24. Skov, M. W., M. Vannini, J. P. Shunula & R. G. Hartnoll, 2002. Quantifying the density of mangrove crabs: Ocypodidae and Grapsidae. Marine Biology 141: 725–731.CrossRefGoogle Scholar
  25. Thurman, C., 2003. Osmoregulation in fiddler crabs (Uca) from temperate Atlantic and Gulf of Mexico coast of North America. Marine Biology 142:77–92.Google Scholar
  26. Tomascik, T., A. J. Mah, A. Nontji & M. K. Moosa, 1997. The Ecology of Indonesian Seas, 2 Vols. Oxford University Press, Oxford.Google Scholar
  27. Weis, J. S. & P. Weis, 2004. The behaviour of four species of fiddler crabs, genus Uca, in southeast Sulawesi, Indonesia. Hydrobiologia 523: 47–58.CrossRefGoogle Scholar
  28. Whittaker, R. H., 1972. Evolution and measurement of species diversity. Taxon 21: 213–251.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of CambridgeCambridgeUK
  2. 2.Marine Research CentrePulau Hoga, Wakatobi, Sulawesi TenggaraIndonesia

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