Fig 6. Six-armed sea star presence and absence before and after the mass mortality.

Data are shown for surveys before the 2011 mass mortality (2001–2010) and after (2012). In the intervening period, Leptasterias sp. became absent from every site within the die-off region in which purple sea urchins experienced mortality (bordered by dashed lines; sites 7, 8, 10, 14, 18, 19). Six-armed sea stars were still found at sites outside the affected region in 2012, as in prior years (sites 3, 4, 24).