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Oil droplet ingestion and oil fouling in the copepod Calanus finmarchicus exposed to mechanically and chemically dispersed crude oil
Author(s) -
Nordtug Trond,
Olsen Anders J.,
Salaberria Iurgi,
Øverjordet Ida B.,
Altin Dag,
Størdal Ingvild F.,
Hansen Bjørn Henrik
Publication year - 2015
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.3007
Subject(s) - calanus finmarchicus , copepod , fouling , biofouling , crude oil , crustacean , environmental science , ingestion , calanus , fishery , environmental chemistry , chemistry , biology , petroleum engineering , geology , biochemistry , membrane
The rates of ingestion of oil microdroplets and oil fouling were investigated in the zooplankton filter‐feeder Calanus finmarchicus (Gunnerus, 1770) at 3 concentrations of oil dispersions ranging from 0.25 mg/L to 5.6 mg/L. To compare responses to mechanically and chemically dispersed oil, the copepods were exposed to comparable dispersions of micron‐sized oil droplets made with and without the use of a chemical dispersant (similar oil droplet size range and oil concentrations) together with a constant supply of microalgae for a period of 4 d. The filtration rates as well as accumulation of oil droplets decreased with increasing exposure concentration. Thus the estimated total amount of oil associated with the copepod biomass for the 2 lowest exposures in the range 11 mL/kg to 17 mL/kg was significantly higher than the approximately 6 mL/kg found in the highest exposure. For the 2 lowest concentrations the filtration rates were significantly higher in the presence of chemical dispersant. Furthermore, a significant increase in the amount of accumulated oil in the presence of dispersant was observed in the low exposure group. Environ Toxicol Chem 2015;34:1899–1906. © 2015 SETAC