Diet of the bull shark, Carcharhinus leucas, and the tiger shark, Galeocerdo cuvier, in the eastern Pacific Ocean

Colombo ESTUPIÑÁN-MONTAÑO; José F. ESTUPIÑÁN-ORTIZ; Luis G. CEDEÑO-FIGUEROA; Felipe Galvan MAGAÑA; Carlos J. POLO-SILVA

Makale detayları

Diet of the bull shark, Carcharhinus leucas, and the tiger shark, Galeocerdo cuvier, in the eastern Pacific Ocean

Yazarlar:

Colombo ESTUPIÑÁN-MONTAÑO | José F. ESTUPIÑÁN-ORTIZ | Luis G. CEDEÑO-FIGUEROA | Felipe Galvan MAGAÑA | Carlos J. POLO-SILVA

Yayıncı:

TUBITAK

Ana Başlıklar:

Zooloji bilimleri/Hayvanlar

Dergi:

Turkish Journal of Zoology 2017 Vol.41 Issue 6, pp.1111-1117

Belge Tipi:

Makale

Yayın Tarihi:

11/2017

Belge Dili:

İngilizce

Document ID (Org No.):

2000773863

Sıklık:

İki Aylık

eISSN:

1303-6114

pISSN:

1300-0179

Özet:

 

This study presents information on the diet of two shark species, Carcharhinus leucas and Galeocerdo cuvier, that inhabit the southeastern Pacific Ocean. The stomachs were collected from October 2003 to July 2005 in Ecuador. Stomachs of 41 C. leucas and six G. cuvier were analyzed. According to the index of relative importance (%IRI), the most important prey for C. leucas were fishes: family Ophichthidae (13.41%), Tylosurus pacificus (9.79%), Katsuwonus pelamis (4.54%), and fish remains (44.81%). G. cuvier, for its part, consumed squids: Ancistrocheirus lesueuri (45.14%), Pholidoteuthis boschmaii (7.81%), and Octopoteuthis spp. (5.17%), as well as turtles: Caretta caretta (9.7%), Lepidochelys cf. kempii (5%), and turtle remains (16.5%). The results show that C. leucas (trophic level, ITR; 4.32 ±±\pm 0.13) and G. cuvier (ITR; 4.26 ±±\pm 0.09) are tertiary consumers, occupying high positions in the food chain, but also are generalist predators that feed on a variety of prey. The high frequency of sea turtles in the stomachs of G. cuvier (>300 cm) suggests that this shark species is an important predator of turtles, which are commonly found along the southeastern Pacific coasts.

Makale detayları

Diet of the bull shark, Carcharhinus leucas, and the tiger shark, Galeocerdo cuvier, in the eastern Pacific Ocean

Yazarlar: Colombo ESTUPIÑÁN-MONTAÑO | José F. ESTUPIÑÁN-ORTIZ | Luis G. CEDEÑO-FIGUEROA | Felipe Galvan MAGAÑA | Carlos J. POLO-SILVA

Yayıncı: TUBITAK

Ana Başlıklar: Zooloji bilimleri/Hayvanlar

Dergi: Turkish Journal of Zoology 2017 Vol.41 Issue 6, pp.1111-1117

Belge Tipi: Makale

Yayın Tarihi: 11/2017

Belge Dili: İngilizce

Document ID (Org No.): 2000773863

Sıklık: İki Aylık

eISSN: 1303-6114

pISSN: 1300-0179

Sayı

Yazarlar:

Colombo ESTUPIÑÁN-MONTAÑO | José F. ESTUPIÑÁN-ORTIZ | Luis G. CEDEÑO-FIGUEROA | Felipe Galvan MAGAÑA | Carlos J. POLO-SILVA

Yayıncı:

TUBITAK

Ana Başlıklar:

Zooloji bilimleri/Hayvanlar

Dergi:

Turkish Journal of Zoology 2017 Vol.41 Issue 6, pp.1111-1117

Belge Tipi:

Makale

Yayın Tarihi:

11/2017

Belge Dili:

İngilizce

Document ID (Org No.):

2000773863

Sıklık:

İki Aylık

eISSN:

1303-6114

pISSN:

1300-0179