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Volume 42 - Number 1 - 2007
Artículo


Food habits of thresher shark Alopias superciliosus (Lowe, 1839) in Ecuadorian Pacific

Carlos Polo-Silva1, Álvaro Baigorrí-Santacruz1, Felipe Galván-Magaña2, Marcela Grijalba-Bendeck1 y Adolfo Sanjuan-Muñoz1

 

1 Facultad de Ciencias Naturales, programa de Biología Marina, Universidad de Bogotá Jorge Tadeo Lozano
Carrera 2 # 11-68, Edificio Mundo Marino, El Rodadero. Santa Marta, Colombia
2 Centro Interdisciplinario de Ciencias Marinas. Av. I. P. N. s/n Colonia Playa Palo de Santa Rita, apartado postal 592. 23000 La Paz, Baja California Sur, México

 

E-mail: marcela.grijalba@utadeo.edu.co

 

The feeding habits of the common thresher shark (Alopiassuperciliosus) from the Pacific coast of Ecuador were investigated by using frequency of ocurrence, numeric and gravimetric methods. A total of 122 individuals were collected from July to December 2003 and grouped by sex and maturity state (mature vs. inmature). Stomach contents were examined and classified by components to infer trophic relations. A total of 27 prey taxa were observed as part of the diet of Alopias superciliosus. Overall, Larimus argenteus (RII=1497) was the most important in the diet, followed by Merluccius gayi (RII=333), Dosidicus gigas (RII=281) and Benthosema panamense (RII=239). The Levin’s index allowed to define A. superciliosus as an specialist predator that feeds in oceanic waters


Key words: Alopias superciliosus, Alopiidae, stomach content, trophic ecology, Ecuador


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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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