Pb and Zn contamination as rate-regulation agents on decomposition of two emergent macrophytes: a systemic approach

Authors

  • Marcel Loyo Moitas Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil.
  • Irineu Bianchini Júnior Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil.
  • Marcela Bianchessi Cunha-Santino Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil. https://orcid.org/0000-0001-6048-0745

DOI:

https://doi.org/10.5132/eec.2019.01.01

Abstract

Modeling the carbon cycling in aquatic environments is relevant for predicting the detritus processing capacity in metal-affected environments. Considering the potential toxic effect of Zn and Pb on microbial metabolism, we hypothesize that the presence of these metals decreases decomposition rates of macrophytes detritus. We examined the anaerobic decomposition of Hedychium coronarium and Urochloa subquadripara in presence of Zn and Pb at 15 and 25°C. The mass decay was parameterized by first-order kinetic model. The higher concentration of Zn promoted reduction on mineralization of particulate organic carbon (POC) in the U. subquadripara and H. coronarium detritus. The Q10 (H. coronarium: 0.95 to 1.75 and U. subquadripara: 1.26 to 1.59) showed a positive effect of temperature increasing during macrophytes anaerobic degradation. Considering the metal type and concentration, the high Zn concentration acted as a driving force over POC decay and consequently affecting the yields in the plant detritus mineralization processes since the decrease in POC degradation was effective due to adsorption of metals in this detritus fraction. The use of mathematical models was suitable tool that allows predicting carbon turnover in an ecosystem submitted to an episode of metal contamination.

Author Biographies

Marcel Loyo Moitas, Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil.

Universidade Federal de São Carlos (SP) - Departamento de Hidrobiologia

Mestre em Ecologia e Recursos Naturais

Irineu Bianchini Júnior, Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil.

Universidade Federal de São Carlos (SP) - Departamento de Hidrobiologia

Marcela Bianchessi Cunha-Santino, Departamento de Hidrobiologia, Universidade Federal de São Carlos (UFSCar), SP, Brasil.

Universidade Federal de São Carlos (SP) - Departamento de Hidrobiologia

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Published

16-08-2019

How to Cite

Moitas, M. L., Bianchini Júnior, I., & Cunha-Santino, M. B. (2019). Pb and Zn contamination as rate-regulation agents on decomposition of two emergent macrophytes: a systemic approach. Ecotoxicology and Environmental Contamination, 14(1), 1–13. https://doi.org/10.5132/eec.2019.01.01

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