John Wiley & Sons, Ltd.

Effects of dispersed oil on reproduction in the cold water copepod Calanus finmarchicus (Gunnerus)

Following a 120 hours exposure period to three concentrations of oil dispersions (0.022, 1.8 and 16.5 mg L−1 + controls) generated from a North Sea crude oil, and a subsequent 21 days recovery, mortality and several reproduction endpoints (egg production rates, egg hatching success, fraction of females participating in reproduction) in Calanus finmarchicus were studied. Concentration‐dependent mortality was found during exposure, averaging to 6, 3, 15 and 42% for the controls and three exposure levels, respectively. At the start of the recovery period mean egg production rates of surviving females from the highest concentrations were very low, but reproduction subsequently improved. In a four‐day single female reproduction test starting 13 days post exposure no significant differences in egg production rates or hatching success between reproducing control and exposed copepods were found. However, a significant lower portion of the surviving females from the highest exposure participated in egg production. The results indicate that although a short‐term exposure for oil‐polluted water after an oil spill can induce severe mortality and temporarily suspend reproduction, copepods may recover and produce viable offspring soon after cessation of exposure. The results may imply that for C. finmarchicus populations the impact from short term exposure to an oil spill may be predicted from acute mortality and that delayed effects have limited contribution to population decrease. Environ Toxicol Chem © 2013 SETAC

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