Diet of two insectivorous fish species in a Brazilian semiarid reservoir
J. Anim. Behav. Biometeorol
; 7(1): 11-17, Jan.2019. map, graf
Article
em En
| VETINDEX
| ID: biblio-1484260
Biblioteca responsável:
BR68.1
Localização: BR68.1
ABSTRACT
Long periods of aridity can cause changes in the diet of fish since hydrological variations affect the availability of food resources. The objective of this study was to investigate the diet of two species of fish (Astyanax aff. bimaculatus and Triportheus signatus), present in the Umari reservoir in Upanema, Rio Grande do Norte, Brazil, to evaluate the influence of seasonality on their diets. The samples were collected quarterly during the months of February to November 2013, with four days in the field, and at five different sites of the reservoir with nets with meshes ranging from 12 to 70 mm (between adjacent nodes). For the identified items in the diet, the frequencies of occurrence and volume, combined in the calculation of the Alimentary Index (IAi), were obtained. Significant alterations in the diet of the species were observed, predominantly in insects. The changes found in the diet indicate an influence of seasonality on the feeding habits of these species, with a predominance of autochthonous items in the dry period and allochthonous items in the rainy period.
Palavras-chave
Texto completo:
1
Base de dados:
VETINDEX
Assunto principal:
Dieta
/
Comportamento Alimentar
/
Characidae
Limite:
Animals
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
J. Anim. Behav. Biometeorol
Ano de publicação:
2019
Tipo de documento:
Article