(2/5) We sampled loggerhead turtles at their nesting site in Mon Repos, QLD, Aus. Using stable isotopes, C13 and N15, the initial goal was to discriminate foraging grounds of these nesting turtles based on expectations of geographically structured isotopic variation due to diet.
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(3/5) We planned to use satellite-tracked turtles with known foraging grounds to build a model that could discriminate foraging grounds. But despite large spatial differences in foraging of tracked turtles, there was no clear-cut geographic structure in isotopic variation.
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(4/5) Fortunately, we had also sampled foraging turtles from south QLD. We were surprised to find that local isotopic variance at this south QLD site encompassed the values observed at the regional level in widely foraging tracked turtles.
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(5/5) These results emphasise a need for large sample sizes to estimate local and regional variance in isotopes to ground truth expectations prior to conducting inferential isotopic analysis in migratory species.
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