Over 675 dolphins have been found dead along the Florida to Texas Gulf Coast since February 2010. Initially people suspected that the BP oil spill and dispersant use might be to blame. A report from NOAA corroborates this with a finding that some 32 live dolphins show signs of chemical stress with liver and lung damage, and other metabolic compromises.
But reports from other research do not show chemical damage, and some focus has shifted over to acoustical exploration for oil and gas. The concern for acoustical trauma has prompted the Bureau of Ocean Energy Management (BOEM) to restrict seismic exploration off Louisiana until May, when the dolphin calving season ends.
Heretofore there have been only loose correlations between seismic exploration and marine mammal strandings, but the tragic strandings of 2000-3000 dolphins this year in Peru has implicated acoustical surveys for oil and gas off Peru’s coast.
It could be that new technologies are being used for the surveys, or that the cumulative stresses of chemical pollution, depleted food sources, and acoustical trauma are causing a rise in strandings world-wide.
Whatever the cause(s), we can be sure that our growing thirst for fossil fuel plays some role in these tragedies.