Resumo
In this work was identifyed the diferents opening forms of the palm nuts Syagrus romanzoffiana by brazilian squirrel Sciurus ingrami in four diferents points of Curitiba, Paraná, Brazil. Was caracterized tive basic forms of opening, in acording with the number of incisions and opening aspects. The form with lower number of incisions (two) was also the greather frequently in the four points sampled (66,25%; N = 5194) well as registred the lower opening time (7,2 ± 1,7 min) in relationship with other forms (9,2 ± 2,3 min). To explicate the diferences in the frequences of forms discovered, is proposed "apprenticeship's hypothesis" which the young squirrels of the population, along the opening nuts apprenticeship, to passing of the forms with larger number of incisions to forms with lower number of incisions, ending in the form of more frequence, which is maintained by adult squirrels.
Rodentia; Sciuridae; seed predation; squirrel behavior; palm nuts
Rodentia; Sciuridae; seed predation; squirrel behavior; palm nuts
Formas de abertura dos frutos de Syagrus romanzoffiana (Chamisso) glassman efetuadas por Sciurus ingrami Thomas (Rodentia, Sciuridae)1 1 Contribuição número 966 do Departamento de Zoologia, Universidade Federal do Paraná
Opening forms of palm nuts Syagrus romanzoffiana (Chamisso) Glassman made by Sciurus ingrami Thomas (Rodentia, Sciuridae)
Marcelo BordignonI; Teresa Cristina C. MargaridoI,II; Rogério R. LangeII
ICurso de Pós-graduacão em Zoologia, Departamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil. Bolsista do CNPq
IIMuseu de História Natural de Curitiba. Rua Benedito Conceição 407, 82810-080 Curitiba, Paraná, Brasil
ABSTRACT
In this work was identifyed the diferents opening forms of the palm nuts Syagrus romanzoffiana by brazilian squirrel Sciurus ingrami in four diferents points of Curitiba, Paraná, Brazil. Was caracterized tive basic forms of opening, in acording with the number of incisions and opening aspects. The form with lower number of incisions (two) was also the greather frequently in the four points sampled (66,25%; N = 5194) well as registred the lower opening time (7,2 ± 1,7 min) in relationship with other forms (9,2 ± 2,3 min). To explicate the diferences in the frequences of forms discovered, is proposed "apprenticeship's hypothesis" which the young squirrels of the population, along the opening nuts apprenticeship, to passing of the forms with larger number of incisions to forms with lower number of incisions, ending in the form of more frequence, which is maintained by adult squirrels.
Key words: Rodentia, Sciuridae, seed predation, squirrel behavior, palm nuts
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AGRADECIMENTOS. À Fundação "O Boticário de Proteção à Natureza" (FBPN) pelo suporte financeiro, à Prefeitura Municipal de Curitiba pelo apoio logístico durante o trabalho de campo. Ao Prof. Dr. Emygdio L. A. Monteiro Filho (Laboratório de Mamíferos, Univerisdade Federal do Paraná), pelas valiosas sugestões durante as revisões deste trabalho. Aos Srs. José Acir Charane e Pedro Sanches pelo valioso auxílio em campo. Ao Sr. Calmon Brito, Sr. Rogério Zanetti e à Diretoria do Parque Recreativo Primavera, por permitirem a utilização de suas áreas para realizar os estudos de campo.
Recebido em 28.III.1996; aceito em 25.XI.1996.
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Datas de Publicação
-
Publicação nesta coleção
13 Jul 2009 -
Data do Fascículo
1996
Histórico
-
Aceito
25 Nov 1996 -
Recebido
28 Mar 1996
