[MARMAM] New report of mercury biomagnification on a tropical food web

lucas Rodrigues Tovar lucastov at yahoo.com.br
Fri Jul 21 13:51:30 PDT 2023

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

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: lucastov at 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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