Barren barren, urchin barrens! #marineexplorer by John Turnbull
How extensive are urchin barrens? In the Hawkesbury bioregion, we have analysed over 900 photographs to conclude that urchin barrens cover over 1/3 of shallow subtidal areas (38%); three times the extent of kelp beds (just 13%). Of the 27 sites studied, 5 had no kelp at all.