Publications des scientifiques de l'IRD

Aguiar-Santos J., deHart P. A. P., Pouilly Marc, Freitas C. E. C., Siqueira-Souza F. K. (2018). Trophic ecology of speckled peacock bass Cichla temensis Humboldt 1821 in the middle Negro River, Amazon, Brazil. Ecology of Freshwater Fish, 27 (4), p. 1076-1086. ISSN 0906-6691.

Titre du document
Trophic ecology of speckled peacock bass Cichla temensis Humboldt 1821 in the middle Negro River, Amazon, Brazil
Année de publication
2018
Type de document
Article référencé dans le Web of Science WOS:000445181800017
Auteurs
Aguiar-Santos J., deHart P. A. P., Pouilly Marc, Freitas C. E. C., Siqueira-Souza F. K.
Source
Ecology of Freshwater Fish, 2018, 27 (4), p. 1076-1086 ISSN 0906-6691
The aim of this study was to analyse the trophic ecology of speckled peacock bass Cichla temensis inhabiting two tributaries of the middle Negro River, the Araca River and the Demeni River. Using an analysis of stomach contents and stable isotope composition (N-15, C-13) of scales, we describe the diet and evaluate the trophic position of subadult and adult individuals. We then test whether diet shifts and trophic positions occurred among successive size classes and among sample locations. The stomach content analysis confirmed the piscivorous feeding habit of the species and showed that the speckled peacock bass preyed on a variety species belonging to different trophic guilds. The length of the ingested prey increased with the size of the speckled peacock bass. Diet composition and trophic position were not different among size classes. C-13 values yielded significant shifts among the size classes: larger individuals displayed higher C-13 values than smaller individuals. Trophic position varied between locations, with lowest values observed in fish from the Araca River. This study demonstrated that diet of C.temensis may vary according to the size of the fish, even at the subadult or adult stages, and according to the river/locality, even within a same basin. We then suggest that further studies take into account local availability of food resources to better explore C.temensis diet and tropic ecology.
Plan de classement
Ecologie, systèmes aquatiques [036] ; Ressources halieutiques [040]
Description Géographique
BRESIL ; AMAZONIE ; NEGRO COURS D'EAU
Localisation
Fonds IRD [F B010074054]
Identifiant IRD
fdi:010074054
Contact