Bioconcentration and lethal effects of gas-condensate and crude oil on nearshore copepod assemblages

Ximena Velasquez, Arseniy R. Morov, Peleg Astrahan, Dan Tchernov, Dalit Meron, Rodrigo Almeda, Maxim Rubin-Blum, Eyal Rahav, Tamar Guy-Haim

Research output: Contribution to journalArticlepeer-review


The progressive establishment of gas platforms and increasing petroleum accidents pose a threat to zooplankton communities and thus to pelagic ecosystems. This study is the first to compare the impacts of gas-condensate and crude oil on copepod assemblages. We conducted microcosm experiments simulating slick scenarios at five different concentrations of gas-condensate and crude oil to determine and compare their lethal effects and the bioconcentration of low molecular weight polycyclic aromatic hydrocarbons (LMW-PAHs) in eastern Mediterranean coastal copepod assemblages. We found that gas-condensate had a two-times higher toxic effect than crude oil, significantly reducing copepod survival with increased exposure levels. The LMW-PAHs bioconcentration factor was 1–2 orders of magnitude higher in copepods exposed to gas-condensate than in those exposed to crude oil. The median lethal concentration (LC50) was significantly lower in calanoids vs. cyclopoid copepods, suggesting that calanoids are more susceptible to gas-condensate and crude oil pollution, with potential trophic implications.

Original languageEnglish
Article number116402
JournalMarine Pollution Bulletin
StatePublished - Jun 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 Elsevier Ltd


  • Bioconcentration
  • Copepods
  • LC
  • Mediterranean Sea
  • Survival, LMW-PAHs


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