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Observations On The Feeding Habits Of The Shark Heterodontus Francisci Girard 1854 (Chondrichthyes: Heterodontidae), In San Ignacio Lagoon, Baja California Sur, Mexico
Author(s) -
Julio César Segura-Zarzosa,
Leonardo Andrés Abitía-Cárdenas,
Felipe GalvánMagaña
Publication year - 1997
Publication title -
ciencias marinas
Language(s) - Spanish
Resource type - Journals
SCImago Journal Rank - 0.215
H-Index - 29
eISSN - 2395-9053
pISSN - 0185-3880
DOI - 10.7773/cm.v23i1.771
Subject(s) - chondrichthyes , biology , callinectes , fishery , predation , estuary , crustacean , ecology
Se revisaron 108 estómagos del tiburón Heterodontus francisci Girard, 1854, capturados en Laguna San Ignacio, Baja California Sur, en muestreos trimestrales de enero de 1992 a febrero de 1993. Esta especie se encuentra en la laguna durante todo el año, disminuyendo su abundancia durante las estaciones de verano y otoño. De acuerdo con el índice de importancia relativa (IIR), el tiburón se alimenta de los siguientes invertebrados bentónicos: gasterópodos (Lucapinella milleri y Calyptraea spp.), crustáceos (Callinectes bellicosus, Penaeus spp. e isópodos), pelecípodos (no identificados), sipuncúlidos (Sipunculus nudus), cefalópodos (Octopus spp.), así como de peces pequeños (Syngnathus auliscus). Heterodontus francisci es un consumidor de tercer orden, ya que es una especie bentónica, predominantemente carnívora, que se caracteriza por ser un depredador selectivo de hábitos nocturnos y/o crepusculares. A total of 108 stomach contents of horn shark (Heterodontus francisci Girard, 1854) from San Ignacio Lagoon were analyzed. The samples were taken seasonally from January 1992 to February 1993. This species occurred all year round, with low abundance in summer and fall. The index of relative importance (IRI) was used to determine the prey importance. The horn shark feeds mainly on benthic invertebrates, such as gastropods (Lucapinella milleri and Calyptraea spp.), crustaceans (Callinectes bellicosus, Penaeus spp. and isopods), pelecypods (unidentified). sipunculoids (Sipunculus nudus), cephalopods (Octopus spp.), as well as on small fishes (Syngnathus auliscus). This shark is a third-order consumer, because it is a predominantly carnivorous benthic species: it is a selective predator with nocturnal or crepuscular habits.

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