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The Food Habits of Sympatric Jaguar and Puma in the Paraguayan Chaco
Author(s) -
Taber Andrew B.,
Novaro Andrés J.,
Neris Nora,
Colman Flavio H.
Publication year - 1997
Publication title -
biotropica
Language(s) - Spanish
Resource type - Journals
SCImago Journal Rank - 0.813
H-Index - 96
eISSN - 1744-7429
pISSN - 0006-3606
DOI - 10.1111/j.1744-7429.1997.tb00025.x
Subject(s) - jaguar , predation , sympatric speciation , puma , biology , food habits , geography , ecology , zoology , medicine , biochemistry , environmental health , gene
Food habits of jaguar and puma were studied in two regions of the Paraguayan Chaco. Biochemical analysis of 280 scats attributed 106 to jaguar and 95 to puma. Overall dietary overlap was 65 percent and they shared six of seven main prey types. For both cats 43 percent of prey items and 15 percent of prey biomass taken were mammal species kg, 23 percent of items and 29 percent of the biomass were from species 1–15 kg, and 27 percent of items and 53 percent of the biomass were from larger species. Birds, reptiles, and insects made up the remainder. In a developed region no significant differences between their diets were found, while in an undeveloped area more small mammals were taken by both species, and jaguar took more large prey than puma. The potential roles of competition and of differences in habitat structure and prey availability between the two areas on these species’ diets are discussed. RESUMEN Se estudiaron los hábitos alimenticios de jaguar y puma en dos regiones del Chaco paraguayo. A través de un análisis bioquímico de 280 heces se asignaron 106 a jaguar y 95 a puma. La superposición trófica total fue 65 por ciento y compartieron 6 de 7 items presa principales. Para ambos gatos las especies de mamíferos de < 1 kg fueron el 43 por ciento de los items presa y el 15 por ciento de la biomasa de presas consumidas, 23 por ciento de items y 29 por ciento de la biomasa fueron de especies de 1–15 kg y 27 por ciento de items y 53 por ciento de biomasa heron de especies mayores. El resto heron aves, reptiles e insectos. En una región desarrollada no se encontraron diferencias significativas entre las dietas, mientras que en una región no desarrollada ambas especies consumieron más pequeños mamíferos y los jaguares consumieron más presas grandes que puma. Se discuten los posibles roles en la dieta de estas especies de la competencia y de diferencias en la estructura del hábitat, y la disponibilidad de presas entre las dos áreas.

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