Risk Analysis Reveals Global Hotspots for Marine Debris Ingestion by Sea Turtles
Global Change Biology (2016) 22, 567–576, doi: 10.1111/gcb.13078 Risk analysis reveals global hotspots for marine debris ingestion by sea turtles QAMAR A. SCHUYLER1 ,CHRISWILCOX2 , KATHY A. TOWNSEND3 , KATHRYN R. WEDEMEYER-STROMBEL4 , GEORGE BALAZS5 ,ERIKVANSEBILLE6,7 andBRITTA DENISE HARDESTY2 1School of Biological Sciences, The University of Queensland, St. Lucia, Qld 4067, Australia, 2Oceans and Atmosphere Flagship, Commonwealth Scientific and Industrial Research Organization, Hobart, Tas. 7000, Australia, 3Moreton Bay Research Station, The University of Queensland, North Stradbroke Island, Qld 4183, Australia, 4Marine Biology Graduate Interdisciplinary Program, Texas A&M University, College Station, TX 77843, USA, 5Pacific Islands Fisheries Science Center, National Oceanic and Atmospheric Administration, Honolulu, HI 96818, USA, 6Climate Change Research Centre and ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW 2052, Australia, 7Grantham Institute & Department of Physics, Imperial College London, London SW7 2AZ, UK Abstract Plastic marine debris pollution is rapidly becoming one of the critical environmental concerns facing wildlife in the 21st century. Here we present a risk analysis for plastic ingestion by sea turtles on a global scale. We combined global marine plastic distributions based on ocean drifter data with sea turtle habitat maps to predict exposure levels to plastic pollution. Empirical data from necropsies of deceased animals were then utilised to assess the consequence of exposure to plastics. We modelled the risk (probability of debris ingestion) by incorporating exposure to debris and consequence of exposure, and included life history stage, species of sea turtle and date of stranding observation as possible additional explanatory factors. Life history stage is the best predictor of debris ingestion, but the best-fit model also incorporates encounter rates within a limited distance from stranding location, marine debris predictions specific to the date of the stranding study and turtle species.
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