Comportamento e habitos alimentares de quatro especies de cichilidae (teleostei) no Pantanal Matogrossense

Trophic dynamics of methylmercury and trace elements in a remote Amazonian Lake

“…However, δ 13 C values of phytoplankton and periphyton may overlap in river-floodplain systems Wantzen et al 2002;Jepsen and Winemiller, 2007). Considering that the species feeds on macrophyte bank species, including filamentous algae and associated invertebrates (Lowe-McConnell, 1969;Machado, 1983;Winemiller et al 1995;Mérona et al 2001;Santos et al 2006;Santos et al, 2009), we may associate the Zn concentrations found in M. festivus to the food web related to the macrophyte bank. The species A. elongatus presented values that were close to those from these two omnivorous fish (T. elongatus and M. festivus), whereas iliophagous and piscivorous had similar values (Fig.…”

“…For Cd, the highest frequencies of occurrence were found in the omnivorous M. festivus (100%), as well as in the piscivorous A. nassa (80%) and C. monoculus (33.3%). The two first species are associated to the littoral vegetation, with the omnivorous feeding either on the macrophyte bank species (mostly filamentous algae) or on the associated invertebrates (Lowe-McConnell, 1969;Machado, 1983;Winemiller et al 1995;Ferreira, 1998;Mérona et al 2001;Mérona and Mérona, 2004;Santos et al 2006;Santos et al, 2009;Prado et al 2010). The highest values found in this omnivorous may be related to Cd solubility (ATSDR, 2008;Mason, 2013), which propitiates an efficient absorption/adsorption by algae and macrophytes.…”