Fig. 2: Variation in heat tolerance trait metrics in Acropora hyacinthus colonies across sites on the Great Barrier Reef organized from north to south.
From: Heat tolerance varies considerably within a reef-building coral species on the Great Barrier Reef
For absolute metrics (i.e., ED50 thresholds), of the maximum quantum yield of photosystem II (Fv/Fm, (A)) and the normalized difference vegetation index (NDVI, (B)), most heat-tolerant individuals (i.e., within the top 20%) were from the northern GBR. In contrast, for retained performance metrics of Fv/Fm (C) and NDVI (D), most heat-tolerant individuals were from the southern GBR. The distribution of top-performing colonies also varied by metric, whereby top performers according to Fv/Fm were found in a smaller number of sites and top performers according to NDVI can be found across most sites. The dashed line indicates the latitudinal divide between north-central sites (above dashed line) and southern sites (below dashed line).
