Vast intertidal benthic habitats exist along the Pilbara coastline in northwest Western Australia. Amongst these systems, dense populations of fiddler crab Tubuca elegans were observed to be residing and feeding amongst an intertidal microbial mat. There is a wealth of knowledge on fiddler crabs within mangrove systems, but little knowledge on how they may use other habitats such as microbial mats. This study aimed to investigate the activity and ecological functions of T.elegans across parallel intertidal microhabitats such as consolidated microbial mat, the microbial mat edge, bioturbated sediment at the edge of a mangrove forest, and a tidal creek mudflat. A combination of camera traps and burrow counts were used to give insights to the varying abundance and activity of crabs with seasonal, diurnal and tidal cycles across habitats. Stable Isotope analysis of N15 and C13 was conducted to investigate trophic connectivity between crabs and primary producers specific to each habitat, and surface sediments were analysed to determine the influence of T.elegans on key nutrient cycling processes. This study provides a holistic overview of how T.elegans utilise and influence intertidal habitats adjacent to mangrove forests, adding knowledge of ecological functions across the broader intertidal marine ecosystem.