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Gelatinous zooplankton play an important role in marine food webs both as major consumers of metazooplankton and as prey of apex predators (e.g., tuna, sunfish, sea turtles). However, little is known about the effects of crude oil spills on these important components of planktonic communities. We determined the effects of Louisiana light sweet crude oil exposure on survival and bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) in adult stages of the scyphozoans  Pelagia noctiluca  and  Aurelia aurita  and the ctenophore  Mnemiopsis leidyi , and on survival of ephyra larvae of  A. aurita  and cydippid larvae of  M. leidyi , in the laboratory. Adult  P. noctiluca  showed 100% mortality at oil concentration ≥20 µL L −1  after 16 h. In contrast, low or non-lethal effects were observed on adult stages of  A. aurita  and  M. leidyi  exposed at oil concentration ≤25 µL L −1  after 6 days. Survival of ephyra and cydippid larva decreased with increasing crude oil concentration and exposition time. The median lethal concentration (LC 50 ) for ephyra larvae ranged from 14.41 to 0.15 µL L −1  after 1 and 3 days, respectively. LC 50  for cydippid larvae ranged from 14.52 to 8.94 µL L −1  after 3 and 6 days, respectively. We observed selective bioaccumulation of chrysene, phenanthrene and pyrene in  A. aurita  and chrysene, pyrene, benzo[ a ]pyrene, benzo[ b ]fluoranthene, benzo[ k ]fluoranthene, and benzo[ a ]anthracene in  M. leidyi . Overall, our results indicate that (1)  A. aurita  and  M. leidyi  adults had a high tolerance to crude oil exposure compared to other zooplankton, whereas  P. noctiluca  was highly sensitive to crude oil, (2) larval stages of gelatinous zooplankton were more sensitive to crude oil than adult stages, and (3) some of the most toxic PAHs of crude oil can be bioaccumulated in gelatinous zooplankton and potentially be transferred up the food web and contaminate apex predators.

Effects of Crude Oil Exposure on Bioaccumulation of Polycyclic Aromatic Hydrocarbons and Survival of Adult and Larval Stages of Gelatinous Zooplankton