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Trophic impacts and interaction of Moroteuthis ingens, Illex argentinus and Loligo gahi in the ecosystem of the Southwestern Atlantic Ocean

Autor Rosas-Luis, Rigoberto ; Sánchez, Pilar ; Río, José Luis del; Portela, Julio M.
Palabras clave Loligo gahi
Moroteuthis ingens
Illex argentinus
Fecha de publicación 27-oct-2012
Citación CIAC 2012 Symposium. Abstracts: 128 (2012)
ResumenThe collision between the Brazil and the Falkland currents over the Patagonian Shelf near 38ºS, creates an area of biological importance in the Southwestern Atlantic Ocean. In this area the fishing activity is developed by fleets from Argentina, Uruguay, Spain, Estonia and far eastern countries such as Japan, Korea, Taiwan, etc. As results of the fishing activity we could know the components of the ecosystem and we observed that Moroteuthis ingens, Illex argentinus and Loligo gahi are the main cephalopod species caught by these fleets in the area between 45-52ºS and 60-63ºW. 118 M. ingens, 94 I. argentinus and 99 L. gahi squids were cached by the commercial fleet in the area. The interval size of these species where between 7-40 cm dorsal longitude mantle DLM, the three species where represented in the 19-33 cm DLM size interval resulting in a same use of the feeding resources. According to the stomach analysis we observed that a major number of M. ingens showed a stomach fullness index of 3 and 4 (60%) while in I. argentinus 15% and L. gahi 5%. Main food items were similar in the three species and for M. ingens the myctophid group and other cephalopods were the main items and the occurrence of this group varied in the other species. These squid species have different adaptations that promote variations in feeding behavior and trophic habits so that their interaction in the same area can be considered as indicator of a high production in the ecosystem
Descripción Cephalopod International Advisory Council (CIAC) Symposium 2012: "Interdisciplinary approaches to cephalopod biology", 27 October - 02 November 2012, Florianópolis, Santa Catarina, Brazil
URI http://hdl.handle.net/10261/95766
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