Papers/Abstracts

Habitat preferences of a seahorse species, Hippocampus reidi (Teleostei: Syngnathidae) in Brazil

Thelma L. P. Dias and Ierecê L. Rosa

aqua, International Journal of Ichthyology, pp. 165-176, Volume 6, Issue 4 – March 2003

Abstract
The habitat preferences of Hippocampus reidi are reported, based on the first field study of a seahorse population in the western south Atlantic. Data on holdfasts used by juveniles and adults were obtained in north-east Brazil between October 2000 and December 2001, during four-hour daily underwater observation sessions over a period of 45 days. The random visual census method was used while snorkelling or scuba diving. Occurrences of seahorses on each holdfast were recorded on an underwater slate, filmed and photographed. H. reidi used a total of 18 different holdfasts, of which the green algae Caulerpa racemosa and C. kempfi, the tunicate Ascidia nigra, and the roots of the mangrove plants Avicennia schaueriana and Rhizophora mangle were the most frequent. H. reidi was also found in crevices or leaning against the muddy bottom. While using the holdfasts, H. reidi were seen feeding (mostly young individuals) or engaging in courtship behaviour. During tidal shifts, they were seen moving with the tide, apparently not engaged in any particular activity. The results of the present study suggest that strategies to conserve seahorse populations in Brazil should emphasize habitat conservation. The algae of the genus Caulerpa constitute one of the most important holdfasts for H. reidi in the study area, both for juveniles and adults.

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REFERENCES

Bortone, S. A., Kimmel, J. J. & C. M. Bundrick. 1989. A comparison of three methods for visually assessing reef fish communities: time and area compensated. Northeast Gulf of Science, 10 (2): 85-96.

Bryant, D., Burke, L., McManus, J. & M. Spalding. 1998. Reefs at Risk. World Resources Institute. 56 pp.

Dias, T. L. P., 2002. Ecologia populacional de Hippocampus reidi Ginsburg, 1933 (Teleostei: Syngnathidae) no Estado do Rio Grande do Norte, Brasil. Dissertação de Mestrado. Programa de Pós-Graduação em Ciências Biológicas, Universidade Federal da Paraíba. 78 pp.

Farnsworth, E. J. & A. M. Ellison. 1997. The global conservation status of mangroves. Ambio, 26:
328-334.

Friedlander, A. M. 2001. Essential fish habitat and the effective design of Marine Reserves: application for marine ornamental fishes. Aquarium Sciences and Conservation, 3 (1-3): 135-150.

Gomon, M. F. 1997. A remarkable new pigmy seahorse (Syngnathidae: Hippocampus) from South-eastern Australia, with redescription of H. bargibanti Whitely from New Caledonia. Memoirs of the Museum of Victoria, 56 (1): 245-253.

James, P. L. & K. L. Heck, Jr. 1994. The effects of habitat complexity and light intensity on ambush predation within a simulated seagrass habitat. Journal of Experimental Marine Biology and Ecology, 176 (2): 187-200.

Jerkins, G. P. & M. J. Wheatley. 1998. The influence of habitat complexity on near shore fish assemblages in a southern Australian embayment comparison of shallow seagrass, reef-algal and unvegetated sand habitats, with emphasis on their importance to recruitment. Journal of Experimental Marine Biology and Ecology, 221: 147-172.

Lieske, E. & R. Myers. 1994. Coral Reef Fishes: Caribbean, Indian Ocean and Pacific Ocean including the Red Sea. Harper Collins, London.

Lourie, S. A., Vincent, A. C. J. & H. J. Hall. 1999. Seahorses: an identification guide to the world’s species and their conservation. Project Seahorse. London. 214 pp.

Perante, N. C., Vincent, A. C. J. & M. G. Pajaro. 1998. Demographics of Hippocampus comes seahorses in Bohol, central Philippines. 439-448. In: Morton, B. (ed.). Proceedings of the 3rd International Conference on Marine Biology of the South China Sea, Hong Kong.

Perante, N. C., Pajaro, M. G., Meeuwig, J. J. & A. C. J. Vincent. 2002. Biology of a seahorse species, Hippocampus comes, in the central Philippines. Journal of Fish Biology, 60: 821-837.

Rosa, I. L., Dias, T. L. P. & J. K. Baum, 2002. Threatened fishes of the world: Hippocampus reidi Ginsburg, 1933 (Syngnathidae). Environmental Biology of Fishes, 64: 378.

Shepherd, S. A., McComb, A. J., Bulthuis, D. A., Neverauskas, V., Steffensen, D. A. & R. West. 1989. Decline of seagrasses. 346-393. In: Larkum, A. W. D., McComb, A. J. & Shepherd, S. A. (eds.). Biology of Seagrasses. Elsevier, Amsterdam.

Steene, R. 1998. Coral Seas. Firefly Books. Ontario, Canada. 271 pp.

Vincent, A. C. J. 1995. Exploitation of seahorses and pipe­­fishes. Naga, The ICLARM Quarterly, 18 (1): 18-19.

Vincent, A. C. J. 1996. The International Trade in Seahorses. Traffic International, Cambridge. 163 pp.

Vincent, A. C. J. 1997. Say nay to seahorses. Living Oceans News, Spring, 1997: 4.

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