> The team compared that data to records that showed how ocean temperatures had changed over time, broken down by the various regions. These regional analyses w

> The team compared that data to records that showed how ocean temperatures had changed over time, broken down by the various regions. These regional analyses were important, because some parts of the ocean have warmed faster than others. > “We then connected those to which populations responded positively, negatively, and which didn’t respond at all,” Dr. Pinsky said. > The data revealed some other trends. Fish populations in the colder parts of their ranges tended to fare better than those located in warmer areas — for those fish, the extra heat was too much. This was especially troubling to the researchers, because the data they used was less detailed in the tropics. Fish losses in those regions may have been higher than in the regions the study focused on, Dr. Pinsky said. > Warm areas fared even worse when they were overfished. The researchers suggested that overfishing made fish even more vulnerable to temperature changes by hurting their ability to reproduce and damaging the ecosystem.