Changes in coral richness

Changes in coral richness (the number of species per site) along the GBR, across the GBR, and with depth. Distance along the reef ranges from 0 at the southern end of the GBR to 1 at the far northern end (corresponding degrees in latitude are given in brackets). Distance across takes the value 0 on the coast and 1 on the 80 m contour of the outer shelf. The short dashed lines along the x-axis indicate the location of the survey sites.