Dear all,
We are pleased to share our newly publication:
Tovar, L.R. et al.Understanding trophic transference role in mercury
biomagnification and bioaccumulation in the Atlantic spotted dolphin (Stenella
frontalis). Chemosphere, p. 139496, 2023.
https://doi.org/10.1016/j.chemosphere.2023.139496
Abstract
Mercury is a metal of toxicological importance that occurs naturally. However,
its concentration can be affected by anthropogenic activities and has the
potential to bioaccumulate and biomagnify in food webs. Thus, knowing how its
concentration varies along the trophic levels allows us to understand its
potential risks to the biota. The present study aimed to investigate mercury
transfer through the Stenella frontalis food web in Ilha Grande Bay (IGB), Rio
de Janeiro state, Brazil. Samples of muscle and liver of S. frontalis were
obtained from carcasses (n = 8) found stranded in the IGB, and its potential
prey species were collected in fishing landings in the same Bay (n = 145).
Total mercury (THg) concentrations were determined by atomic absorption
spectrometry, and the δ15N was determined by an isotope ratio mass
spectrometer. To investigate how trophic transfer affects mercury contamination
in biota, six linear models were applied between THg logarithmic concentrations
and δ15N or trophic position (TP). The trophic magnification factor (TMF) was
calculated from each model to estimate the trophic transfer. Mean THg
concentration in S. frontalis was higher in the liver than in muscle, but no
correlation was found with age and δ15N values. Instead, the hepatic and
muscular THg concentrations positively correlated with the trophic position. In
the summer, THg concentration, TP, and δ15N values in prey species varied
significantly, as well as in the winter, except for THg concentration. All
trophic transfer models were significant in both seasons, and the TMF >1. The
present study showed that trophic transfer is an essential factor in mercury
biomagnification in both seasons but is not the unique driver. Both δ15N and TP
could explain mercury trophic transfer, but TP better integrates metabolic
diversity and seasonality.
The full text is available open acess till september. For futher informations
mail me on: lucas...@yahoo.com.br
best regards,
Msc. Lucas R. Tovar
Bacharel em Ciências Biológicas com ênfase em meio ambiente pela UFFMestre em
oceanografia pela UERJDoutorando em ecologia e evolução pela UERJLaboratório de
Mamíferos Aquáticos e Bioindicadores (MAQUA-UERJ)
Underdegree in Biological Sciences with emphasis on environmental studies at
UFFMaster degree in Oceanography at UERJPHD studant in ecology and evolution at
UERJAquatic Mammal and Bioindicatores Lab (MAQUA-UERJ)
Lucas R. Tovar (ele/dele, he/him)
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