Providing a Knowledge Base for Implementing the National Partnership Approach to Marine Turtle and Dugong Management in the Gulf of Carpentaria by Integrating Traditional Knowledge and Western Science

Other Publication ResearchOnline@JCU
Grech, Alana;Marsh, Helene;Hamann, Mark
Abstract

[Extract] Aerial surveys for turtles and dugongs conducted since the mid 1980s using standardised methodology have provided long-term information on the distribution and abundance of turtles and dugongs in the Gulf of Carpentaria. We used information collected from five aerial surveys spanning 16 years in conjunction with geostatistical techniques, including universal kriging, to develop spatial models of turtle and dugong distribution and relative density in the Gulf of Carpentaria. We categorised areas as of low, medium, medium-high or high ecological value for dugongs based upon the relative densities integrated across surveys. Our approach assumes that dugong density is a robust index of a region's value for dugongs. The model accounts for temporal changes in the use of various regions by dugongs including movements resulting from events such as seagrass dieback by integrating information across surveys.

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15

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