Características alimentares e potencial impactante da rã- touro Lithobates catesbeianus (SHAW,1802)

• Ano de defesa: 2009
• Autor(a) principal: Camargo Filho, Cláudio Barberini
• Orientador(a): Ribeiro Filho, Oswaldo Pinto
• Banca de defesa: Neves, Clóvis Andrade , Matta, Sérgio Luis Pinto da , Seixas Filho, José Teixeira de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Biologia Animal
• Departamento: Biologia e Manejo animal
• País: BR
• Palavras-chave em Português: Rã-touro; Dietas; Impacto ambiental; Predação
• Palavras-chave em Inglês: Bullfrog; Diet; Environmental impact; Predation
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA::ZOOLOGIA APLICADA
• Link de acesso: http://locus.ufv.br/handle/123456789/2219

This work was development in two experiments: evaluation of feed parameters of bullfrog, Lithobates catesbeianus (SHAW, 1802), sampled in natural environments and evaluation of gastric capacity, predation and time of passage of preys (tadpole and imago) in digestive system of bullfrog Lithobates catesbeianus (SHAW, 1802) maintained in captivity in different weights. The first experiment aimed to know the feed behavior of bullfogs in municipalities of Minas Gerais and São Paulo state (Brazil). There were sample 49 animals, they were frozen and taken to the Laboratory of Bullfrog Culture of Federal University of Viçosa. Subsequently, they were dissected and its gastric content was then studied. Each prey was indentified until its higher taxonomic level. The second experiment aimed evaluate gastric and predation capacity and the total time of passage of the prey (tadpole and imago of bullfrog) in digestive system. There were used 876 tadpoles in different stages of development (GOSNER, 1960) and 420 imagoes, using 710 bullfrogs feeding induced, with 5 weight imago classes: class 1, imagoes from 10.00 to 39.99 g; class 2, imagoes from 40.00 to 69.99 g; class 3, imagoes from 70.00 to 99.99 g; class 4, imagoes from 100.00 to 149.99 g; and class 5, from 150.00 to 199.99 g. Those animal in induced feeding past through a 48 h fasting before feeding and their prey, both tadpoles and imagoes, were case-hardened to determinate its weights and volume. In the imagoes, also it was verified the length between face and cloaca. It was verified that bullfrogs, when young, feed mainly insects and that they are more generalist when adult, with wild variety diet: insects, crustacean, anuran amphibian and snakes. Bullfrogs have a great development capacity in environment which they are introduced and it has a high chance of dissemination. The total feed passage time in digestive system is independent of the classes studied. The gastric capacity decreases as the total corporal weight increases. The total passage time of tadpole is slower than the imagoes. The bullfrog is an animal with a high impact on herpetofauna.