ESR prepress abstract  -  doi: 10.3354/esr00789

OVERVIEW: Effects of the Deepwater Horizon oil spill on protected marine species

Bryan Wallace, Tom Brosnan*, Danya McLamb, Teri Rowles, Eric Ruder, Barbara Schroeder, Lori Schwacke, Brian Stacy, Laurie Sullivan, Ryan Takeshita, Diane Wehner

*Email: tom.brosnan@noaa.gov

ABSTRACT: The Deepwater Horizon (DWH) incident was the largest offshore oil spill in the history of the United States, contaminating surface waters; the water column; deep-sea corals and benthos; nearshore and coastal ecosystems; and natural resources across 5 states and an ocean area of more than 112,000 km2 in the Gulf of Mexico (GoM). Protected marine species – sea turtles and marine mammals, in particular – were a main focus of the DWH Natural Resource Damage Assessment (NRDA). The DWH spill overlapped in time and space with sea turtle and marine mammal habitats and life stages throughout the northern GoM. Thus, the DWH NRDA Trustees (2016) performed several activities to assess adverse effects of oil exposure on sea turtles and marine mammals to quantify the full extent and nature of the impacts to these taxa across the region. A synopsis of the Trustees’ assessment activities and conclusions is presented in the DWH NRDA Programmatic Damage Assessment and Restoration Plan (DWH NRDA Trustees 2016). This Theme Section presents several of these specific marine mammal and sea turtle assessment activities and associated findings. This overview paper provides a context for the Theme Section papers, introduces basic NRDA concepts and discusses generally why and how protected marine species were assessed in the DWH NRDA.