La alimentación de tiburones martillo jóvenes (Sphyrna Lewini) capturados en el golfo de Nicoya, Costa Rica

Zanella Cesarotto, Ilena ^[1] ; López Garro, Andrés ^[2] ; Arauz Vargas, Randall ^[2]
1. [1] Universidad Nacional de Costa Rica
  
  Universidad Nacional de Costa Rica
  
  Heredia, Costa Rica
2. [2] Programa Restauración de Tortugas Marinas (PRETOMA). Apartado 1203-1100 San José, Costa Rica
Localización: Boletín de Investigaciones Marinas y Costeras, ISSN-e 2590-4671, ISSN 0122-9761, Vol. 39, Nº. 2, 2010, págs. 447-453
Idioma: español
Títulos paralelos:
- The feeding habits of juvenile scalloped hammerhead sharks (Sphyrna Lewini) caught in the gulf of Nicoya, Costa Rica
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Resumen
- Sharks present strong intraspecific changes in feeding habits, which may vary according to size, geographic location and season. This study analyzed the stomach contents of 52 juvenile scalloped hammerhead sharks (25 females and 27 males) caught by artisanal vessels in the Gulf of Nicoya. Regarding the organisms found in the stomachs, 41.07 % were teleost fish, 30.36 % mollusks and 28.57 % crustaceans. Mollusks presented the highest Relative Importance Index (RII) (43.05 %), followed by teleost fish (41.37 %) and crustaceans (15.58 %). Squids (Loliginidae) were the items with the greatest RII (32.57 %). By means of the Pianka index, a relatively low overlap between sexes was identified, suggesting a spatial sexual segregation and, in consequence, an ecological niche separation between male and female hammerhead sharks.