Dataset for: Five year of Deepwater Horizon oil spill effects on marsh periwinkles Littoraria irrorata

This dataset reports the density and mean length of marsh periwinkles Littoraria irrorata at oiled and non-oiled sites in coastal Louisiana, Mississippi, and Alabama from 2010 to 2015. Data include the length of one individual snail measured at each site. These data are associated with the publication: Zengel S, Weaver J, Pennings SC, Silliman B, Deis DR, Montague CL, Rutherford N, Nixon Z, Zimmerman AR (2016) Five years of Deepwater Horizon oil spill effects on marsh periwinkles Littoraria irrorata. Mar Ecol Prog Ser https://doi.org/10.3354/meps11827.