Fig. 3.

Local temperatures and the temperature range for optimal aerobic performance for 5 species of damselfishes represented by 3 populations spanning 2,321 km from the southern Great Barrier Reef (GBR) to Papua New Guinea. Sampling sites are represented by their latitudinal position (°S). Each species is represented by a unique colour. Note: D. melanurus was only investigated at the equatorial site; whereas, D. aruanus was investigated only at Lizard and Heron Islands. All individuals tested within each species and population were ranked by maximal aerobic scope. The top performers (the top 25% of aerobic scope values) within each species and population were selected, and the corresponding temperatures were plotted on this graph as mean ± SD to represent the range of optimal performance. Gray rectangles represent the summer maximum, average, and minimum sea surface temperatures for each site. A thin, hashed line and a thick, hashed line represent each site’s annual summer average and overall average, respectively. The temperature blocks extend to include each location’s annual minimum sea surface temperatures as well. Sea surface temperatures are from monthly IGOSS data collections between 1982 and 2012 (see Materials and Methods for further details).