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Seasonality of energy sources of Colossoma macropomum in a floodplain lake in the Amazon – lake Camaleão, Amazonas, Brazil
Author(s) -
OLIVEIRA A. C. B.,
MARTINELLI L. A.,
MOREIRA M. Z.,
SOARES M. G. M.,
CYRINO J. E. P.
Publication year - 2006
Publication title -
fisheries management and ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 55
eISSN - 1365-2400
pISSN - 0969-997X
DOI - 10.1111/j.1365-2400.2006.00481.x
Subject(s) - tambaqui , floodplain , macrophyte , amazon rainforest , seasonality , biomass (ecology) , dry season , zooplankton , ecology , environmental science , biology , zoology , fishery , fish <actinopterygii>
Stomach content and stable isotopes of tambaqui, Colossoma macropomum (Cuvier), were use to determine seasonality of energy sources in a floodplain lake in the central Amazon. The turnover time of carbon in young tambaqui was fast enough to detect a broad seasonal variation both in stomach content and tissue isotopic signal of carbon and nitrogen. The relative importance of food items varied with water level. C 3 plants (seeds and fruits) contributed between 55% and 95% of the biomass fraction of tambaqui. Zooplankton contributed a minimum of 26% of the nitrogen fraction during periods of flooding, and a maximum of 67% in the dry season. C 4 plants (macrophyte leaves and roots) contributed a maximum of 26% of the biomass fraction and 13% of the N fraction mainly during the flooding period. The feeding habits and behaviour of tambaqui are complex and linked to the flood pulse.