Resumo
Using a figure which is a combination of volume percentage (Vi) in the axis of x and frequency of occurrence percentage (Fi) in the axis of y it is possible to obtain paralelograms representing the relative importance of the food items. The paralelogram areas are proportional to the volume (%) and frequency of occurrence (%) products; such values are used to calculate a "feeding index" (IAi). This "feeding index'' is proposed as a new method to evaluate the true importance of each food item in the feeding spectrum of each species, as well as to contribute to the understanding of the relationships between several species when applied to fish fauna from the same place and at the same time.
ARTIGOS
Método gráfico e estimativa de índice alimentar aplicado no estudo de alimentação de peixes
E. KawakamiI; G. VazzolerII
ICompanhia de Tecnologia de Saneamento Ambiental - CETESB, S. Paulo, SP, Brasil
IIInstituto Oceanográfico da Universidade de São Paulo, São Paulo, SP, Brasil
SYNOPSIS
Using a figure which is a combination of volume percentage (Vi) in the axis of x and frequency of occurrence percentage (Fi) in the axis of y it is possible to obtain paralelograms representing the relative importance of the food items. The paralelogram areas are proportional to the volume (%) and frequency of occurrence (%) products; such values are used to calculate a "feeding index" (IAi).
This "feeding index'' is proposed as a new method to evaluate the true importance of each food item in the feeding spectrum of each species, as well as to contribute to the understanding of the relationships between several species when applied to fish fauna from the same place and at the same time.
Texto completo disponível apenas em PDF.
Full text available only in PDF format.
Bibliografia
- HYNES, H.B.N. 1950. The food of freshwater sticklebacks (Gasterosteus aculeatus and Pygosteus pungitius), with a review of methods used in studies of the food of fishes. J. Anim. Ecol., 19(1):36-58.
- KAWAKAMI, E, 1975. Alimentação de Pleuronectiformes (Análise comparativa e bionomia;. Dissertação de Mestrado Universidade de São Paulo, Instituto Oceanografico.
- LANDE, R. 1973. Food and feeding habits of plaice (Pleuronectes platessa L.) in Borgenfjorden, North-Trondelag, Norway. Norw. J. Zool., 21:91-100.
- ______ 1976. Food and feeding habits of the dab (Limanda limanda (L.) ) in Borgenfjorden, North-Trondelag, Norway. Norw. J. Zool., 24:225-230.
Datas de Publicação
-
Publicação nesta coleção
06 Jun 2012 -
Data do Fascículo
1980
