Data

NE Australia dugong distribution and relative density groups

James Cook University
Marsh, Helene ; Grech, Alana
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.25903/pmz0-p693&rft.title=NE Australia dugong distribution and relative density groups&rft.identifier=10.25903/pmz0-p693&rft.publisher=James Cook University&rft.description=Spatially-explicit models of dugong density and distribution were developed using data from marine megafauna aerial surveys conducted in NE Australia. The method followed Grech and Marsh (2007) and Grech et al. (2011) with improvements as per Sobtzick et al. (2017). Input data: Dugong counts corrected for perception and depth-specific availability probabilities as per the Hagihara method, except in Torres Strait. Model: The data were modelled using the geostatistical interpolation method Empirical Bayesian Kriging (EBK) in ArcGIS 10.7. The semivariogram type was linear and the smoothed search neighbourhood was set to a radius of 5000m. Relative densities were calculated at a grid size of 1 km2. Dugong densities per grid cell were classified as Low (0 dugongs per km2); Medium (0-0.5 dugongs per km2); High (0.5-1 dugongs per km2), and Very high (>1 dugongs per km2). Grid cells with 0 dugongs per km2 were included: (1) to ensure that the spatial layers of dugong density extended across the entire survey area; (2) because dugongs are likely to move across grids where they were not detected during the surveys, and (3) because we have not attempted to estimate abundance for areas where dugongs were not sighted. The value of grid cells in the data are: 1 = Low; 2 = Medium; 3 = High; 4 = Very high.&rft.creator=Marsh, Helene &rft.creator=Grech, Alana &rft.date=2021&rft.relation=https://doi.org/10.1371/journal.pone.0017993&rft.relation=https://www.researchgate.net/publication/228360895_Prioritising_areas_for_dugong_conservation_in_a_marine_protected_area_using_a_spatially_explicit_population_model &rft.relation=https://www.researchgate.net/publication/248883043_Distribution_and_Abundance_of_Dugongs_in_the_Northern_Great_Barrier-Reef_Marine_Park &rft.relation=https://data.marinemammals.gov.au/common/documents/grants/2013/13_31_Marsh_Grech.pdf&rft.relation=http://www.nerptropical.edu.au/sites/default/files/publications/files/An%20assessment%20of%20the%20distribution%E2%80%A6%20Sobtzick%20et%20al%202014.pdf &rft.coverage=135.979544,-12.21118 141.429825,-12.297068 141.078194,-9.102097 144.330781,-9.102097 146.880106,-15.114553 148.989892,-19.394068 152.418294,-23.563987 154.440173,-25.244696 154.440173,-27.293689 152.330387,-27.527758 150.308508,-24.44715 146.264752,-19.973349 143.012165,-15.284185 141.517733,-18.312811 138.177238,-18.812718 134.309297,-15.876809 134.660928,-13.239945 135.979544,-12.21118&rft.coverage=Great Barrier Reef World Heritage Area, Gulf of Carpentaria, Torres Strait, Hervey Bay, Moreton Bay&rft_rights=&rft_rights=CC BY: Attribution 3.0 AU http://creativecommons.org/licenses/by/3.0/au&rft_subject=Dugong&rft_subject=Great Barrier Reef World Heritage Area&rft_subject=Gulf of Carpentaria&rft_subject=Torres Strait&rft_subject=Hervey Bay&rft_subject=Moreton Bay&rft_subject=aerial surveys&rft_subject=ARC Centre of Excellence for Coral Reef Studies&rft.type=dataset&rft.language=English Access the data
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Spatially-explicit models of dugong density and distribution were developed using data from marine megafauna aerial surveys conducted in NE Australia. The method followed Grech and Marsh (2007) and Grech et al. (2011) with improvements as per Sobtzick et al. (2017). Input data: Dugong counts corrected for perception and depth-specific availability probabilities as per the Hagihara method, except in Torres Strait. Model: The data were modelled using the geostatistical interpolation method Empirical Bayesian Kriging (EBK) in ArcGIS 10.7. The semivariogram type was linear and the smoothed search neighbourhood was set to a radius of 5000m. Relative densities were calculated at a grid size of 1 km2. Dugong densities per grid cell were classified as Low (0 dugongs per km2); Medium (0-0.5 dugongs per km2); High (0.5-1 dugongs per km2), and Very high (>1 dugongs per km2). Grid cells with 0 dugongs per km2 were included: (1) to ensure that the spatial layers of dugong density extended across the entire survey area; (2) because dugongs are likely to move across grids where they were not detected during the surveys, and (3) because we have not attempted to estimate abundance for areas where dugongs were not sighted. The value of grid cells in the data are: 1 = Low; 2 = Medium; 3 = High; 4 = Very high.

Created: 2021-12-02

Data time period: 26 11 2021 to 26 11 2021

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135.97954,-12.21118 141.42983,-12.29707 141.07819,-9.1021 144.33078,-9.1021 146.88011,-15.11455 148.98989,-19.39407 152.41829,-23.56399 154.44017,-25.2447 154.44017,-27.29369 152.33039,-27.52776 150.30851,-24.44715 146.26475,-19.97335 143.01217,-15.28419 141.51773,-18.31281 138.17724,-18.81272 134.3093,-15.87681 134.66093,-13.23995 135.97954,-12.21118

144.374735,-18.3149275

text: Great Barrier Reef World Heritage Area, Gulf of Carpentaria, Torres Strait, Hervey Bay, Moreton Bay

Subjects
ARC Centre of Excellence for Coral Reef Studies | Dugong | Great Barrier Reef World Heritage Area | Gulf of Carpentaria | Hervey Bay | Moreton Bay | Torres Strait | aerial surveys |

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Identifiers
  • DOI : 10.25903/PMZ0-P693
  • Local : researchdata.jcu.edu.au//published/588427e04e5711ec8178bfe67171bb3e
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