The influence of seasonality, fish size and reproductive status on EROD activity in Plagioscion squamosissimus: Implications for biomonitoring of tropical/subtropical reservoirs

Autor(es)

Wunderlich, Alison C. ^{[1, 2]} ; Silva, Reinaldo J. ^[2] ; Zica, Erica O. P. ^[2] ; Rebelo, Mauro F. ^[3] ; Parente, Thiago E. M. ^[4] ; Vidal-Martinez, Victor M. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Politecn Nacl, Lab Parasitol, Ctr Invest & Estudios Avanzados, Unidad Merida, Merida 97310, Yucatan - Mexico

^[2] Univ Estadual Paulista UNESP, IBB, BR-18618970 Sao Paulo - Brazil

^[3] Univ Fed Rio de Janeiro, Inst Biofis Carlos Chagas Filho, BR-21941 Rio De Janeiro - Brazil

^[4] Escola Nacl Saude Publica, Lab Toxicol Ambiental, Fundacao Oswaldo Cruz, Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOLOGICAL INDICATORS; v. 58, p. 267-276, NOV 2015.
• Citações Web of Science: 4

Resumo

Ethoxyresorufin-O-deethylase (EROD) activity is considered an important biomarker for aquatic environmental contamination. Although EROD activity has been widely used as a biomarker of exposure to polycyclic aromatic hydrocarbons in fish, this activity can be influenced in the field by spatial-, seasonal- or individual-related factors. We therefore performed a comparative study of hepatic EROD activity levels in the croaker Plagioscion squamosissimus to determine whether variations existed in enzyme activity levels, especially in relationship to reproductive status, fish size, age, and seasonality. For this purpose, we collected fish from three reservoirs with different pollution levels during the early-rainy (November 2012), rainy (March 2013), and dry (July August 2013) seasons from the Tiete River, Brazil. We tested whether size, age and sex affected EROD activity among the localities and seasons. We found a marked effect of pollution during the dry season on variation among the localities in EROD activity in P. squamosissimus. An analysis of covariance indicated that sex had a significant negative effect on the seasonal variability of the EROD activity levels at the most polluted locality (near sao Paulo). A possible explanation for the statistical association between EROD activity and sex is that the reproductive status of the females influenced the EROD activity levels. A possible explanation for the statistical association between EROD activity and sex is that the reproductive status of the females influenced the EROD activity levels, also largely reported in the literature. Our results suggest that reproductive status can be a significant confounding factor for determining EROD activity in female P. squamosissimus in freshwater ecosystems when compared to males. Moreover, our results suggest that the presence of phenanthrene during the dry season at Barra Bonita reservoir might explain the highest EROD activity responses in this period of study. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/00561-0 - Parasitos de peixes e biomarcadores como ferramentas para avaliação da poluição em rios e represas no Rio Tietê, estado de São Paulo
• Beneficiário: Reinaldo José da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular