Fig. 1
From: Large-scale facilitation of a sessile community by an invasive habitat-forming snail
Map of global distribution of Batillaria australis. Grey line native region. Black circle (Swan River Estuary, Perth) invaded region. Insert map of 13 study sites in the Swan River Estuary. 1 Charles Court, 2 Matilda Bay*, 3 Leeuwin, 4 Chidley Point, 5 J.H. Abrahams, 6 Mills Point, 7 Como, 8 Heathcote, 9 Jeff Joseph Reserve, 10 Point Resolution, 11 Freshwater Bay, 12 Gilbert Fraser, 13 Point Walter. *No seagrass beds at this location. The middle and lower Swan River Estuary is ca. 26Â km2 (compared to 7.8Â km2 for the two upstream river regions), where ca. 10Â km2 is shallower than 3Â m (pers. com. B. Marillier) of which ca. 5.5Â km2 are covered by seagrass (Hillman et al. 1995)