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Freshwater ecosystems are often extensively modified and impacted by anthropological activity. Therefore, many freshwater species encounter considerable risk of extinction. In Australian freshwaters, one taxon facing substantial endangerment from multiple stressors is the endemic freshwater crayfish genus Euastacus. However, in-situ investigations to examine the effect of these impacts on Euastacus populations are scarce. The critically endangered Fitzroy Falls spiny crayfish (Euastacus dharawalus) is facing considerable risk of extinction. This species is endemic to only one stream which has been subject to extensive disturbance through habitat destruction, modification, and non-native species introductions, including the highly invasive common yabby (Cherax destructor). However, the extent to which these threatening processes impact E. dharawalus is not known. Specifically, the in-situ competitive effect of C. destructor remains undetermined. Therefore, I aimed to address these knowl

Fitzroy fallsStable isotopeRadio telemetry