New Orleans, La. - When researchers from Tulane and the University of Louisiana-Lafayette began a study of blue crabs in the Gulf of Mexico after the Deepwater Horizon oil spill, they expected a big kill-off. However, their investigations have not indicated any obvious or dramatic mortality rates. The ongoing study is funded by the BP/Gulf of Mexico Research Initiative.
Six months before the spill, Caz Taylor, assistant professor of Ecology and Evolutionary Biology and co-principal investigator of the study, was already researching crab movements along the coast.
For months her team collected samples of megalopae, the secondary stage in a crab's development from larvae to adult. Blue crabs live near the shore for most of their lives, but at spawning time, the females swim out into the Gulf. Their eggs hatch into tiny larvae that drift with the currents. Some reach shore and develop into adult crabs.
"The spill began at the peak of the spawning season, and the Deepwater Horizon rig was smack in the middle of my study area," says Taylor. "My first thought was that everything would die, but as far as we can tell, that didn't happen."
With the spill, her investigation shifted focus and expanded to seven sites from Galveston to Appalachicola from mid-May to the end of October, 2010.