Marine Pollution Bulletin: Dispersant application increases adverse long-term effects of oil on shrimp larvae (Pandalus borealis) after six hour exposure.

A NORCE team of researchers consisting of Frederike Keitel-Gröner, Maj Arnberg, Renée K. Bechmann, Emily Lyng and Thierry Baussant, have a new publication titled “Dispersant application increases adverse long-term effects of oil on shrimp larvae (Pandalus borealis) after six hour exposure” in Marine Pollution Bulletin. 

Abstract:

The application of chemical dispersants is one option of oil spill response (OSR). Here, Northern shrimp (Pandalus borealis) larvae were experimentally exposed for short periods (6 h and 1 h) to a realistic concentration of chemically dispersed oil (CDO) (~10 mg L-1 THC), mechanically dispersed oil (MDO) (~7 mg L-1 THC), and dispersant only (D). A control (C) with seawater served as reference. Short-term effects on survival and feeding were examined right after exposure and longer-term consequences on survival, feeding, growth and development following 30 days of recovery. Both exposure durations provoked long lasting effects on larval fitness, with 1 h exposure leading to minor effects on most of the selected endpoints. The 6 h exposure affected all endpoints with more adverse impacts after exposure to CDO. This study provides important data for assessing the best OSR option relevant to NEBA (Net Environmental Benefit Analysis).

Highlights: 

  • Short- and long-term effects of oil spill response on shrimp larvae
  • Field-realistic concentrations of oil and chemical dispersant
  • Long lasting effects of short exposure (6 h and 1 h) on larvae fitness parameters
  • Addition of chemical dispersant increases short- and long-term adverse effects of oil.
  • Contribution to NEBA decision-frameworks for reaction and mitigation

Reference: 

Keitel-Gröner, F.; Arnberg, M.; Bechmann, R.K.; Lyng, E.; Baussant, T. (2020): Dispersant application increases adverse long-term effects of oil on shrimp larvae (Pandalus borealis) after six hour exposure. Marine Pollution Bulletin 151 C (2020) 110892. DOI: 10.1016/j.marpolbul.2020.110892 [intranet]