Are changes in the structure of nematode assemblages reliable indicators of moderate petroleum contamination? |
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Authors: | Daniel Silva Leite Leonardo Sandrini-Neto Manuela Zeglin Camargo Micheli Cristina Thomas Paulo C Lana |
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Institution: | 1. Centro de Estudos do Mar, Universidade Federal do Paraná, Av. Beira Mar s/n, PO Box 61, CEP 83255-976 Pontal do Paraná, Paraná, Brazil;2. Universidade do Estado de Santa Catarina, Av. Madre Benvenuta 2007, CEP 88035-001 Florianópolis, Santa Catarina, Brazil |
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Abstract: | This study assesses through a multiple before-after-control-impact (MBACI) design the effects of diesel oil on the structure of nematode assemblages in unvegetated tidal flats of a subtropical estuary. Oil-exposed treatments were contrasted with controls for a duration of four successive days before and after an experimental spill in three distinct areas of the Paranaguá Estuarine Complex (Southern Brazil). No significant differences were observed in nematode total density, number of taxa and the overall assemblage structure between the control and impact treatments from before to after the experimental spill. This reinforces the idea that, despite being good indicators of environmental stress, free-living marine nematodes are able to tolerate low concentrations of hydrocarbons and to survive in moderately contaminated areas. We also show that robust experimental designs are useful to avoid confounding expected natural variability with the effects of a mild impact. |
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Keywords: | Nematodes Experimental oil spill Diesel MBACI Paranaguá Bay |
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