Atlantic salmon swimming against the river current.
and shelter in the shade. Fish in the Wrights River, meanwhile, converged on what patches of deeper, cooler water they could find, like holes in the streambed out of the sun’s glare. One of those areas of relief, though, hadn’t occurred naturally. It had been created by humans pumping cold water from a nearby well into the overheated stream. Cold-loving fish, like Atlantic salmon, flocked to this stretch of water in droves.
Salmon can tolerate high temperatures for short periods of time. Migrating upriver through shallow water warmed by the sun, the fish tend to seek out what researchers refer to as “thermal refuges,” spots of relatively cool water where they can rest before journeying farther upstream. The idea behind the experiments this past summer, presented at a meeting of the Geological Society of America on Oct.
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