Trophic relationships and mercury biomagnification in Brazilian tropical coastal food webs

Bisi, Tatiana L.; Lepoint, Gilles; Azevedo, Alexandre de Freitas; Dorneles, Paulo R.; Flach, Leonardo; Das, Krishna; Malm, Olaf; Lailson‐Brito, José

doi:10.1016/j.ecolind.2011.11.015

Cited by 131 publications

(77 citation statements)

References 48 publications

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“…The slopes from the present study were shallower than a recently reported TMS for a food web from nearby Sarasota Bay (i.e., 0.27, Hong et al 2013) but were slightly steeper than a TMS reported for a study completed just offshore of southwest Florida (i.e., 0.207, Thera and Rumbold 2014) and a recent study of tropical coastal food webs in Guanabara Bay and Ilha Grande Bay (ranged as high as 0.22) in Brazil (Bisi et al 2012). …”

Section: Trophic Magnification Slopescontrasting

confidence: 47%

Mercury biomagnification through food webs along a salinity gradient down-estuary from a biological hotspot

Rumbold¹,

Lange²,

Richards³

et al. 2018

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Abstract:To examine down-estuary effects and how differences in food webs along a salinity gradient might influence mercury (Hg) biomagnification, we conducted a study from [2010][2011][2012][2013][2014][2015] in an estuary with a known biological hotspot at its headwaters. Over 907 samples of biota, representing 92 different taxa of fish and invertebrates, seston and sediments were collected from the upper, middle and lower reach for Hg determination and for stable nitrogen and carbon isotope analyses. Trophic magnification slopes (TMS; log Hg versus δ15N), as a measure of biomagnification efficiency, ranged from 0.23 to 0.241 but did not differ statistically among reaches. Hg concentrations were consistently highest, ranging as high as 4.9 mg/kg in top predatory fish, in the upper-reach of the estuary where basal Hg entering the food web was also highest, as evidenced by methylmercury concentrations in suspension feeders. Top predatory fish at the mouth of the estuary contained relatively low [THg], likely due to lower basal Hg. This was nonetheless surprising given the potential for down-estuary biotransport.

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Section: Trophic Magnification Slopescontrasting

confidence: 47%

Mercury biomagnification through food webs along a salinity gradient down-estuary from a biological hotspot

Rumbold¹,

Lange²,

Richards³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…1) presents the most preserved ecosystem and it is considered to be a biodiversity hotspot and includes a high number of protected areas (Bisi et al 2012). Conversely, Guanabara Bay-GB (total area: 384 Km 2 ; 22°40 0 S and 23°00 0 S; Fig.…”

Section: Methodsmentioning

confidence: 99%

Mercury and Selenium in a Top-Predator Fish, Trichiurus lepturus (Linnaeus, 1758), from the Tropical Brazilian Coast, Rio de Janeiro

Seixas

Moreira

Malm

et al. 2012

Bull Environ Contam Toxicol

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Muscular mercury and selenium were assessed in a voracious fish from three Brazilian coastal areas with different environmental conditions. Mercury was higher in specimens from Ilha Grande Bay (0.35 ± 0.17 μg g(-1)) than in cutlassfish from Guanabara Bay (0.30 ± 0.15 μg g(-1)) and Buzios coast (0.13 ± 0.08 μg g(-1)), respectively. No difference was found regarding selenium among these areas. Mercury was positively correlated with fish length and size intervals (sub-adult, small and large adult), suggesting that larger and older fish bioaccumulated more mercury. A large excess of molar selenium in relation to mercury was observed.

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“…Finding high concentrations of persistent accumulative toxicants in this dolphin population is not surprising. Rough-toothed dolphins from RJ feed on top-predator fish (Bisi et al, 2012;Melo et al, 2010), thus they are more likely to take in high amounts of contaminants that have accumulated in the bodies of the prey.…”

Section: Rough-toothed Dolphinsmentioning

confidence: 99%

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

Dorneles

Sanz

Eppe

et al. 2013

Science of The Total Environment

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• Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans • Negative correlations were found between length and TEQ values in franciscanas.• PCB concentrations found are among the highest ever reported for cetaceans. a b s t r a c t a r t i c l e i n f o Blubber samples from three delphinid species (false killer whale, Guiana and rough-toothed dolphin), as well as liver samples from franciscana dolphins were analyzed for dioxins and related compounds (DRCs). Samples were collected from 35 cetaceans stranded or incidentally captured in a highly industrialized and urbanized area (Southeast and Southern Brazilian regions). Dioxin-like PCBs accounted for over 83% of the total TEQ for all cetaceans. Non-ortho coplanar PCBs, for franciscanas (82%), and mono-ortho PCBs (up to 80%), for delphinids, constituted the groups of highest contribution to total TEQ. Regarding franciscana dolphins, significant negative correlations were found between total length (TL) and three variables, ΣTEQ-DRCs, ΣTEQ-PCDF and ΣTEQ non-ortho PCB. An increasing efficiency of the detoxifying activity with the growth of the animal may be a plausible explanation for these findings. This hypothesis is reinforced by the significant negative correlation found between TL and PCB126/PCB169 concentration ratio. DRC concentrations (ng/g lipids) varied from 36 to 3006, for franciscana dolphins, as well as from 356 to 30,776, for delphinids. The sum of dioxin-like and indicator PCBs varied from 34,662 to 279,407 ng/g lipids, for Guiana dolphins from Rio de Janeiro state, which are among the highest PCB concentrations ever reported for cetaceans. The high concentrations found in our study raise concern not only on the conservation of Brazilian coastal cetaceans, but also on the possibility of human health problem due to consumption of fish from Brazilian estuaries.

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Trophic relationships and mercury biomagnification in Brazilian tropical coastal food webs

Abstract: Background: The Present study was carried out to track and calculate Biomagnification

Cited by 131 publications

References 48 publications

Mercury biomagnification through food webs along a salinity gradient down-estuary from a biological hotspot

Mercury biomagnification through food webs along a salinity gradient down-estuary from a biological hotspot

Mercury and Selenium in a Top-Predator Fish, Trichiurus lepturus (Linnaeus, 1758), from the Tropical Brazilian Coast, Rio de Janeiro

High accumulation of PCDD, PCDF, and PCB congeners in marine mammals from Brazil: A serious PCB problem

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