Antioxidant responses in estuarine invertebrates exposed to repeated oil spills: Effects of frequency and dosage in a field manipulative experiment

•We assessed the impact of repeated diesel spills on biomarker responses in macrofauna.•Three frequencies of exposure events were contrasted against two dosages of oil.•Antioxidant defense responses and oxidative damage were affected by frequent spills.•Biomarkers were induced by frequent small spil...

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