Combined Effects of Temperature and Salinity on Larval Development of the Mangrove Crab Parasesarma catenata Ortman, 1897 (Brachyura: Sesarmidae)

  • José Paula Instituto do Mar - Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Estrada do Guincho, 2750-642 Cascais, Portugal
  • Ricardo Nogueira Mendes Instituto do Mar - Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Estrada do Guincho, 2750-642 Cascais, Portugal;
  • James Mwaluma Kenya Marine Fisheries and Research Institute, Cement Road, P.O. Box 81651, Mombasa, Kenya
  • Claudia Raedig Instituto do Mar - Laboratório Marítimo da Guia, Faculdade de Ciências da Universidade de Lisboa, Estrada do Guincho, 2750-642 Cascais, Portugal
  • Winston Emmerson Department of Zoology, University of Transkei, P. Bag X1, 5117, Umtata, South Africa
Keywords: larval development, temperature, salinity, Brachyura, mangroves

Abstract

Keywords: larval development, temperature, salinity, Brachyura, mangroves

The larval stages of the mangrove crab Parasesarma catenata were reared in the laboratory from eggs of females collected in the Mgazana estuary, South Africa. Survival and duration of larval stages were tested for the combined effects of temperature and salinity in a factorial design experiment, using three females each with two replicates of 15 larvae per combination. Combinations were made from five temperature (15, 20, 25, 30 and 35 ºC) and four salinity values (15, 25, 35 and 45 ‰). Results were tested by ANOVA and multiple regression was applied to generate contour models by polynomial equation. It was found that P. catenata larvae develop optimally in near to seawater salinity at a temperature of around 25 ºC. These results support the assumption that newly-hatched larvae of this species are exported from the estuarine environment to the sea for development.

Western Indian Ocean Journal of Marine Science Vol.2(1) 2003: 57-63
Published
2004-04-14
Section
Articles

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eISSN: 0856-860X
print ISSN: 0856-860X