Revista de Biología Tropical

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https://hdl.handle.net/10669/15280

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Examinando Revista de Biología Tropical por Materia "594.322 867 Caracoles marinos"

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  • Miniatura
    Ítem
    Características poblacionales del cambute, Strombus galeatus (Gastropoda: Strombidae) en el Parque Marino Ballena, Pacífico, Costa Rica (1999-2003)
    (2008-12) Arroyo Mora, Daisy
    Marine parks and reserves are important for biodiversity conservation and as sustainable places for recovery of fishery resources, especially for those species of economic importance such as the Pacific conch Strombus galeatus. Independent surveys, from 1999 to 2003 were done in three areas in the park, by snorkeling and/or scuba diving. A total of 168 live snails were captured, and 120 of them were marked with plastic tags, albeit none were recaptured. Conchs were found on sandy and rocky bottoms, with young protected in corals or rocks. The population was mostly composed by young adults (50% of the popula- tion; mean length 162.2mm), with a 50:50 sex ratio. Density was 683 conchs/ha which reflects a relatively good population condition for the area. This park has natural barriers, allowing conchs to move along the area.
  • Miniatura
    Ítem
    Crecimiento y reproducción de Strombus galeatus (Gastropoda: Strombidae) en el Pacífico de Costa Rica
    (1998) Arroyo Mora, Daisy
    Strombus galeatus is a gastropod distributed from the Gulf of California in Mexico to the Galapagos Islands in Ecuador, and as other strombid species, in the costarican coast is a resource of high overfishing with no governmental control or regulations and scarce biological information about the species. Biological studies on this conch natural populations from managed and unmanaged areas were conducted during a four year period (November 1993 to December 1997). Results showed that this conch is found in sand gravy bottoms and most of them found in less than 15 meter deep areas. Shell growlh is first done in length and lip formation and afterwards on lip thickness; shell morphology was found different in juvenile and adult stages. The shell represented 8O% of total fresh weight and presented an external brownish and white colors with some spots inside it. This dioecious species, performed a special reproductive behavior: the female genital groove appeared thickned, males seek for females, and conchs used to form groups of more than two individuals (from which one used to be a female); matting is presumed and the female lays an egg mass from which the veliger larvae appears after 3 to 5 days. It is believed that their most imponant diet is macroalgae. No predation was observed upon the conchs during surveys; no shell damage was observed in adults and little in juveniles: few adult conchs were observed with scars in their foot and other structures. This species seems to have a high regeneration potential in juvenile and adult stages. A parasitic isopod was found attached to the upper right side of the foot in 10 of the 627 conchs observed.