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Elementos traço em tecido hepático de tartaruga-verde (Chelonia mydas) coletadas na Bacia de Santos, Brasil

Authors: Sulato, Everton Tiago;

Elementos traço em tecido hepático de tartaruga-verde (Chelonia mydas) coletadas na Bacia de Santos, Brasil

Abstract

As concentrações de As, Cd, Cr, Cu, Pb, Mn, Mo, Zn, Ni, Ba V e Hg em tecido hepático de tartarugas verdes (Chelonia mydas) encalhadas na costa brasileira (n = 506) foram determinadas. Os dados foram comparados em função das variáveis do registro de ocorrência (data, local) e do registro das características biológicas (sexo, idade, estágio de desenvolvimento e comprimento curvilíneo da carapaça). A possível influência temporal das atividades de exploração e produção de petróleo foi avaliada. As concentrações médias de Cd, Cu, Mn, Zn e Hg foram as maiores encontradas em tecido hepático de C. mydas coletadas na costa do Brasil. A concentração média dos elementos em ordem decrescente foi Cu > Zn > Cd > Mn > As > Hg > Mo > Pb > V > Ni > Ba > Cr. Foi observada diferença significativa nas concentrações de Hg em função do sexo (machos > fêmeas). Diferenças significativas para sexo não haviam sido observadas anteriormente no Brasil. Foram observadas diferenças significativas (p 50 cm) apresentaram maiores concentrações médias para Cu, Pb, Mo, Zn, Ba e V quando comparados com indivíduos com comportamento oceânico (CCC < 30 cm). O oposto foi observado para as concentrações médias de As e Hg. Não foi observada autocorrelação espacial para as concentrações dos elementos. No presente estudo, a linha de base da concentração de 12 elementos traço em tecido hepático de indivíduos juvenis de C. mydas na Bacia de Santos, Brasil foi estabelecida (Nível de 95% de confiança), sendo As = 9 ± 10; Cd = 25 ± 18; Cr = 0,12 ± 0,10; Cu = 207 ± 125; Pb = 0,7 ± 1,0; Mn = 12 ± 4; Mo = 1,0 ± 0,6; Zn = 147 ± 50; Ni = 0,3 ± 0,4; Ba = 0,2 ± 0,3; V = 0,7 ± 0,9; Hg = 2 ± 22 mg kg-1 . Não foi possível estabelecer relação entre as concentrações dos elementos e fontes de contaminação provindas das atividades de exploração e produção de petróleo e gás natural. No entanto, foi observada expressiva influência da fase de desenvolvimento, fortemente relacionada aos hábitos alimentares, na concentração de elementos analisados.

As, Cd, Cr, Cu, Pb, Mn, Mo, Zn, Ni, Ba V and Hg concentrations in liver tissue of green turtles (Chelonia mydas) stranded on the Brazilian coast (n=506) were determined. The data was compared to occurrence registers (date, location) and biological characteristics (sex, age, stage of development and curved carapace length). Possible temporal influence of oil exploration and production activities was assessed. The mean concentration of Cd, Cu, Mn, Zn and Hg were the highest reported in liver for C. mydas in Brazilian coast. The mean concentration of the elements in decreasing order was Cu> Zn> Cd> Mn> As> Hg> Mo> Pb> V> Ni> Ba> Cr. Significant difference between the sexes was observed for Hg (males > females). This difference had not been previously observed in Brazil. Significant differences (p 50 cm) presented higher concentrations for Cu, Pb, Mo, Zn, Ba and V when compared to the ones at the oceanic stage (CCL < 30 cm). The opposite pattern was observed for As and Hg. Spatial autocorrelation was not observed for element concentrations. In the present study, a baseline concentration of 12 trace elements was stablished for liver tissue of C. mydas juveniles in Santos Basin, Brazil, at 95% confidence level (As = 9 ± 10; Cd = 25 ± 18; Cr = 0.12 ± 0.10; Cu = 207 ± 125; Pb = 0.7 ± 1.0; Mn = 12 ± 4; Mo = 1.0 ± 0.6; Zn = 147 ± 50; Ni = 0.3 ± 0.4; Ba = 0.2 ± 0.3; V = 0.7 ± 0.9; Hg = 2 ± 22 mg kg-1). Influence of oil and natural gas production activities on the concentration of the elements could not be stablished. However, it was observed an expressive influence of the individual’s development stage, highly related to feeding habits, in the concentration of analyzed elements.

Pós-graduação em Geociências e Meio Ambiente - IGCE

Country
Brazil
Keywords

Tartaruga marinha, Liver, Fígado, Metals, Baseline concentrations, Comprimento curvilíneo da carapaça, Concentração de linha de base, Metais, Sea turtle, Curved carapace length

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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