Bioaccumulation of petroleum hydrocarbons in fiddler crabs (Uca minax) exposed to weathered MC-252 crude oil alone and in mixture with an oil dispersant

摘要: Abstract The Deepwater Horizon accident in the Gulf of Mexico resulted a sustained release crude oil, and weathered oil was reported to have washed onto shorelines marshes along coast. One strategy minimize effects tarballs, slicks, sheen, subsequent risk nearshore ecosystem resources use dispersants (primarily Corexit® 9500) at offshore surface deepwater locations. Data been generated reporting how 9500 other may alter acute toxicity (Louisiana sweet crude) marine organisms. However, it remains unknown influence bioaccumulation petroleum hydrocarbons crustaceans. We compare fiddler crabs ( Uca minax ) from exposures water accommodated fraction (WAF) Mississippi Canyon 252 (~ 30 d post spill) chemically-enhanced WAF when mixed with EC9500A. Whole body total hydrocarbon (TPH) concentrations were greater than background for both treatments after 6 h exposure reached steady state 96 h. modeled TPH uptake rate only treatment k u  = 2.51 mL/g/h vs. 0.76 mL/g/h). Furthermore, during phase patterns tissues varied between oil + dispersant treatments. Steady factors (BAFs) 19.0 mL/g 14.1 mL/g oil + Corexit treatments, respectively. These results suggest that toxicokinetic mechanisms be dependent on dispersion (e.g., smaller droplet sizes). also indicate multiple processes functional roles species should considered understanding bioavailability hydrocarbons.