Urchin barren zone
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Video surveys of long spined sea urchin (Centrostephanus rodgersii) barrens habitat, eastern Tasmania
The spatial extent of C. rodgersii "barrens" was estimated by surveying rocky reef habitat with a towed underwater video system. Sampling took place at 13 regions along the east coast of Tasmania, each comprising 3 subsites. Substrate and habitat type were recorded using video analysis, with 4 categories of urchin barren habitat recognised (see below for definitions).