TY - JOUR T1 - Predicting Geographic Ranges of Marine Animal Populations Using Stable Isotopes: A Case Study of Great Hammerhead Sharks in Eastern Australia A1 - Raoult,Vincent A1 - Trueman,Clive N A1 - Kingsbury,Kelsey M A1 - Gillanders,Bronwyn M A1 - Broadhurst,Matt K A1 - Williamson,Jane E A1 - Nagelkerken,Ivan A1 - Booth,David J A1 - Peddemors,Victor A1 - Couturier,Lydie Ir A1 - Gaston,Troy F AD - School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW, Australia AD - Ocean and Earth Science, University of Southampton, Southampton, United Kingdom AD - Southern Seas Ecology Laboratories, School of Biological Sciences and The Environment Institute, The University of Adelaide, Adelaide, SA, Australia AD - Fisheries Conservation Technology Unit, National Marine Science Centre, New South Wales Department of Primary Industries, Southern Cross University, Coffs Harbour, NSW, Australia AD - Department of Biological Sciences, Macquarie University, Sydney, NSW, Australia AD - School of Life Sciences, University of Technology Sydney, Sydney, NSW, Australia AD - New South Wales Department of Primary Industries, Sydney Institute of Marine Science, Mosman, NSW, Australia AD - Univ Brest, IRD, Ifremer, CNRS, LEMAR, Plouzané, France UR - https://archimer.ifremer.fr/doc/00662/77363/ DO - 10.3389/fmars.2020.594636 KW - habitat range population distributions KW - movement KW - species distribution model KW - sharks KW - manta rays KW - stable isotopes KW - tracking KW - isoscape N2 - Determining the geographic range of widely dispersed or migratory marine organisms is notoriously difficult, often requiring considerable costs and typically extensive tagging or exploration programs. While these approaches are accurate and can reveal important information on the species, they are usually conducted on only a small number of individuals and can take years to produce relevant results, so alternative approaches may be preferable. The presence of latitudinal gradients in stable carbon isotope compositions of marine phytoplankton offers a means to quickly determine likely geographic population ranges of species that rely on productivity from these resources. Across sufficiently large spatial and temporal scales, the stable carbon isotopes of large coastal or pelagic marine species should reflect broad geographic patterns of resource use, and could be used to infer geographic ranges of marine populations. Using two methods, one based on a global mechanistic model and the other on targeted low-cost latitudinal sampling of fishes, we demonstrate and compare these stable isotope approaches to determine the core population geography of an apex predator, the great hammerhead (Sphyrna mokarran). Both methods indicated similar geographic ranges and suggested that S. mokarran recorded in south-eastern Australia are likely to be from more northern Australian waters. These approaches could be replicated in other areas where coastlines span predictable geographic gradients in isotope values and be used to determine the core population geography of highly mobile species to inform management decisions. Y1 - 2020/12 PB - Frontiers Media JF - Frontiers In Marine Science SN - 2296-7745 VL - 7 ID - 77363 ER -