Interannual recruitment dynamics for resident and transient marsh species: evidence for a lack of impact by the Macondo oil spill

PLoS One. 2013;8(3):e58376. doi: 10.1371/journal.pone.0058376. Epub 2013 Mar 13.

Abstract

The emulsification of oil at the Deepwater Horizon (DWH) well head relegated a large proportion of resultant hydrocarbon plumes to the deep sea, facilitated the incorporation of oil droplets into microbial and planktonic food web, and limited the severity of direct, wetland oiling to coastal Louisiana. Nevertheless, many transient fish and invertebrate species rely on offshore surface waters for egg and larval transport before settling in coastal habitats, thereby potentially impacting the recruitment of transient species to coastal nursery habitats quite distant from the well site. We compared the utilization of salt-marsh habitats by transient and resident nekton before and after the DWH accident using data obtained from an oyster reef restoration project in coastal Alabama. Our sampling activities began in the summer preceding the DWH spill and continued almost two years following the accident. Overall, we did not find significant differences in the recruitment of marsh-associated resident and transient nekton in coastal Alabama following the DWH accident. Our results, therefore, provide little evidence for severe acute or persistent oil-induced impacts on organisms that complete their life cycle within the estuary and those that spent portions of their life history in potentially contaminated offshore surface waters prior to their recruitment to nearshore habitats. Our negative findings are consistent with other assessments of nekton in coastal vegetated habitats and bolster the notion that, despite the presence of localized hydrocarbon enrichments in coastal habitats outside of Louisiana the most severe oil impacts were relegated to coastal Louisiana and the deep sea. Analyzing all the information learned from this accident will undoubtedly provide a synthesis of what has or has not been affected in the Northern Gulf of Mexico, which when put in context with oil spill studies elsewhere should improve our ability to avert and manage the negative consequences of such accidents.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Alabama
  • Biomass*
  • Ecosystem*
  • Petroleum Pollution / adverse effects*
  • Seasons
  • Water Pollutants, Chemical
  • Wetlands*

Substances

  • Water Pollutants, Chemical

Grants and funding

This work was supported by funding provided by NOAA Fisheries Emergency Disaster Relief Program (EDRP) Funds, administered through the Alabama Department of Conservation and Natural Resources; BP grants made to the Marine Environmental Science Consortium and the Northern Gulf Institute; and in part by a grant from BP/The Gulf of Mexico Research Initiative through the Florida Institute of Oceanography to the Florida Institute of Technology. The funders had no role in study design, data collection and analyses, decision to publish, or preparation of the manuscript, nor does this alter the authors′ adherence to all the PLOS ONE policies on sharing data and materials.