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Overgrazing by sea urchins on temperate reefs can affect a phase shift from macro -\udalgal beds to ‘barrens’ habitat largely devoid of seaweeds. Existing models of barrens formation\udare derived largely from observations of strongylocentrotid urchins, which typically show a\udbehavioural shift from cryptic feeding to exposed grazing fronts that move through and ‘mow\uddown’ macroalgal beds. Foraging by the temperate diadematid urchin Centrostephanus rodgersii\udtriggers a similar transition from intact macroalgal bed to widespread barren grounds but does not\udappear to involve a behavioural shift. Fine-scale foraging movements were observed using timelapse\udphotography across the urchin’s range-extension region and described with respect to a\udrandom walk model. Foraging was highly nocturnal, with individuals homing strongly to available\udcrevices. In situ monitoring of tagged individuals suggests strong fidelity to and thus high stability\udof barren patches, while similar behavioural patterns across habitat types representing a gradient\udof foraging intensities indicate no behavioural shift associated with overgrazing. Laboratory\udexperiments showed that C. rodgersii lacks a directional chemosensory response to either macro -\udalgae or conspecifics. Combined evidence suggests a model of barrens formation fundamentally\uddifferent to the well-established ‘feeding front’ model, with formation of widespread barrens by\udC. rodgersii occurring from the ‘inside out’ via growth and coalescence of small barrens patches\udthat form within macroalgal beds as a result of additive localised grazing radiating from crevice\udshelters. Regulation of urchin density at the spatial scale of individual barrens patches is proposed\udas a viable option to manage the formation of widespread barrens habitat within the urchin’s\udrecent range-extension to eastern Tasmania

Forming sea urchin barrens from the inside out: an alternative pattern of overgrazing