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Percentage survival of N. vectensis juveniles following a 24 h exposure to low UV and/or polycyclic aromatic hydrocarbons (PAHs). The PAHs used were (A) pyrene and (B) benzo[a]pyrene (B[a]P). Symbols represent the mean ± s.d. for three to four replicate dishes, each containing 9–12 animals. No mortality was observed in control animals: seawater and UV, DMSO and UV, 70 μg l−1 pyrene without UV, and 500 μg l−1 B[a]P without UV (not shown).
