Abstract
In this paper we analysed autotrophic sources of the carbon (δ 13C) and the trophic position (δ 15N) of Leporinus friderici in the influence area of Corumbá Reservoir, Brazil. We collected samples of muscles of fish from different sizes riparian vegetation, C4 grasses, zooplankton, periphyton and particulate organic carbon (POC). There were significant differences for the carbon isotope proportion found in muscles of L.␣friderici in the different size groups analysed. The highest values of δ 13C recorded for middle sized individuals is attributed to the large contribution of C4 plants in their diet. Small individuals sampled upstream also receive similar contribution from C4 plants. In contrast the same size group sampled downstream from the reservoir, has a much smaller of C4 plants. The δ 13C negative character of small individuals from downstream is due to the larger contribution of C3 plants (except periphyton). At larger sizes we found intermediate δ 13C values. The δ 15N proportions we found for each size group were not significantly different, however we found decreasing mean values with increasing size. The trophic level calculated from the dietary data was higher than that found with the δ 13C concentration in the muscle, except for small individuals, when the values were equal.
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Benedito cecilio, E., Leandro pereira, A. & Mônica sakuragui, C. Effect of size on the energy acquired in species of the fish from a neotropical reservoir, Brazil. Environmental Biology of Fishes 71, 313–320 (2004). https://doi.org/10.1007/s10641-004-0256-y
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DOI: https://doi.org/10.1007/s10641-004-0256-y