Demographic Clusters Identified within the Northern Gulf of Mexico Common Bottlenose Dolphin (Tursiops truncates) Unusual Mortality Event: January 2010-June 2013

1 National Marine Mammal Foundation, San Diego, California, United States of America, 2 National Marine Fisheries Service, Southeast Fisheries Science Center, Miami, Florida, United States of America, 3 National Marine Fisheries Service, Southeast Regional Office, St. Petersburg, Florida, United States of America, 4 NOAA Affiliate, Southeast Fisheries Science Center, Miami, Florida, United States of America, 5 Dauphin Island Sea Lab and University of South Alabama, Dauphin Island, Alabama, United States of America, 6 Hubbs- SeaWorld Research Institute, Melbourne Beach, Florida, United States of America, 7 Institute for Marine Mammal Studies, Gulfport, Mississippi, United States of America, 8 Emerald Coast Wildlife Refuge, Fort Walton Beach, Florida, United States of America, 9 Marine Wildlife Response, Esther, Florida, United States of America, 10 Audubon Aquarium of the Americas, New Orleans, Louisiana, United States of America, 11 Gulf World Marine Park, Panama City Beach, Florida, United States of America, 12 Louisiana Department of Wildlife and Fisheries, Baton Rouge, Louisiana, United States of America, 13 Texas Marine Mammal Stranding Network, Galveston, Texas, United States of America, 14 National Marine Fisheries Service, Office of Protected Resources, Silver Spring, Maryland, United States of America