@Article{Azevedo-SilvaACOCDABMT:2016:MeBiTr,
author = "Azevedo-Silva, Claudio Eduardo and Almeida, Ronaldo and Carvalho,
Dario P. and Ometto, Jean Pierre Henry Balbaud and Camargo,
Pl{\'{\i}}nio B. de and Dorneles, Paulo R. and Azeredo, Antonio
and Bastos, Wanderley R. and Malm, Olaf and Torres, Jo{\~a}o P.
M.",
affiliation = "{Universidade Federal do Rio de Janeiro (UFRJ)} and {Universidade
Federal do Amazonas (UFAM)} and {Universidade Federal do Rio de
Janeiro (UFRJ)} and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Universidade de S{\~a}o Paulo (USP)} and
{Universidade Federal do Rio de Janeiro (UFRJ)} and {Universidade
Federal do Rio de Janeiro (UFRJ)} and {Universidade Federal de
Rond{\^o}nia (UFRO)} and {Universidade Federal do Rio de Janeiro
(UFRJ)} and {Universidade Federal do Rio de Janeiro (UFRJ)}",
title = "Mercury biomagnification and the trophic structure of the
ichthyofauna from a remote lake in the Brazilian Amazon",
journal = "Environmental Research",
year = "2016",
volume = "151",
pages = "286--296",
month = "Nov.",
keywords = "Fish, Mercury, Migration, River-floodplain system, Trophic
magnification factor.",
abstract = "The present study assesses mercury biomagnification and the
trophic structure of the ichthyofauna from the Puruzinho Lake,
Brazilian Amazon. In addition to mercury determination, the
investigation comprised the calculation of Trophic Magnification
Factor (TMF) and Trophic Magnification Slope (TMS), through the
measurements of stable isotopes of carbon (\δ13C) and
nitrogen (\δ15N) in fish samples. These assessments were
executed in two different scenarios, i.e., considering (1) all
fish species or (2) only the resident fish (excluding the
migratory species). Bottom litter, superficial sediment and seston
were the sources used for generating the trophic position (TP)
data used in the calculation of the TMF. Samples from 84 fish were
analysed, comprising 13 species, which were categorized into four
trophic guilds: iliophagous, planktivorous, omnivorous and
piscivorous fish. The \δ13C values pointed to the separation
of the ichthyofauna into two groups. One group comprised
iliophagous and planktivorous species, which are linked to the
food chains of phytoplankton and detritus. The other group was
composed by omnivorous and piscivorous fish, which are associated
to the trophic webs of phytoplankton, bottom litter, detritus,
periphyton, as well as to food chains of igap{\'o}
(blackwater-flooded Amazonian forests). The TP values suggest that
the ichthyofauna from the Puruzinho Lake is part of a short food
web, with three well-characterized trophic levels. Mercury
concentrations and \δ13C values point to multiple sources
for Hg input and transfer. The similarity in Hg levels and TP
values between piscivorous and planktivorous fish suggests a
comparable efficiency for the transfer of this metal through
pelagic and littoral food chains. Regarding the two abovementioned
scenarios, i.e., considering (1) the entire ichthyofauna and (2)
only the resident species, the TMF values were 5.25 and 4.49, as
well as the TMS values were 0.21 and 0.19, respectively. These
findings confirm that Hg biomagnifies through the food web of
Puruzinho Lake ichthyofauna. The migratory species did not
significantly change mercury biomagnification rate in Puruzinho
Lake; however, they may play a relevant role in Hg transport. The
biomagnification rate (TMS value) in Puruzinho Lake was higher
than the average values for its latitude, being comparable to TMS
values of temperate and polar systems (marine and freshwater
environments).",
doi = "10.1016/j.envres.2016.07.035",
url = "http://dx.doi.org/10.1016/j.envres.2016.07.035",
issn = "0013-9351",
language = "en",
targetfile = "azevedo_mercury.pdf",
urlaccessdate = "27 abr. 2024"
}