a-b) Change in tolerable habitat area from 1951-1980 to 1981-2010 within NWA (a) or MAB (b), estimated from corrected HC assuming all previously occupied range temperatures (Supplementary Table 5) are tolerable. c) Change in occupied range area from 1951-1980 to 1981-2010, estimated from occurrence locations within MAB, for species with > 200 occurrence observations in each time period as indicated by asterisks above x-axis (species number). Species’ occupied areas changed by an average of − 24.5% for bivalves (#1–20), − 29.5% for gastropods (#21–28), 12.7% for polychaetes (#29–43), and − 38.2% for one echinoderm with sufficient data. For species with estimates in c, tolerable ranges increased overall by an average of 3.3% in NWA and 0.02% in MAB. Within MAB, changes in occupied range area and tolerable range area were uncorrelated.