Fig. 1. Left panel: location of the GRT in the Toliara region. Toponymy refers to villages mentioned in the paper. IFY4, GRT1, and GRT2 correspond to the locations of coral cores used for environmental proxies. Middle panel: a modern satellite view (Quickbird 2006) of the GRT. The square is the location of an example of image time series, on the right panel. On the right, changes are shown across 50 years, with aerial black and white photographs from 1962 and 1973, and from satellite images shown in both black and white (for comparison with historical photographs) and natural color on the lower panels. “A” indicates the habitat showing the most dramatic changes: reef flat with live coral strips has shifted to rubble and boulders covered by algae. “B” indicates the location of seagrass beds that have disappeared in the southern part of the GRT, being replaced by sand in 2006. Category 4 cyclone Boloetse, passing near Toliara early 2006, may be responsible for redistributing loose sediments and temporary covering features that are visible on images before and after 2006. The arrow shows pseudo-invariant features that remain visible across time (here, patch of low relief hardground). Images SGM (1962); SAG 464 (1973), Quickbird (2006), WorldView-2 (2011).

Fig. 1