Nematode/copepod ratio and nematode and copepod abundances as bioindicators of pollution: a meta-analysis

Michel Sciberras; Agustín G. Menechella; Kevin A. Rucci; Néstor J. Cazzaniga; Hugo J. Marrero

doi:10.25260/EA.22.32.2.0.1840

Authors

Michel Sciberras Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS). Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
Agustín G. Menechella Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS). Instituto Argentino de Oceanografía (IADO), UNS-CONICET
Kevin A. Rucci Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET). Instituto de Virología ‘Dr. J.M. Vanella’ (InViV), Facultad de Ciencias Médicas, Universidad Nacional de Córdoba (UNC)
Néstor J. Cazzaniga Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur (UNS). Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC)
Hugo J. Marrero Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS), UNS-CONICET

DOI:

https://doi.org/10.25260/EA.22.32.2.0.1840

Keywords:

global-scale analysis, heavy metal, organic matter, oil pollution, marine meiofauna, monitoring

Abstract

Meiofauna has been considered a suitable group for monitoring pollution effects. Based on different pollution tolerance, a nematode/copepod ratio was proposed as an easy tool for monitoring the effect of anthropogenic activities. Although the validity of this tool has been subject to debate due to controversial results, it is still widely used. To establish a general pattern in the response of the ratio and nematode and copepod abundances to the effects of organic enrichment, oil pollution and metal enrichment in the marine environment, we conducted a global-scale meta-analysis. The database consisted of 715 pairs of data obtained from 46 studies published during the last 39 years. We could not find a general trend in the response of nematode and copepod abundances to these pollutants. Regarding the ratio, the only significant difference we found is under the effect of oil pollution. However, this difference appears to be an artifact due to publication bias. The information gathered in this study suggests that the ratio and mean abundances are not reliable tools for monitoring purposes.

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