III. Rocky Mountains (USA and Canada)

Lightly populatedm in north, rapid population growth in south; irrigated agriculture, recreation, urban expansion increasingly competing for water; headwaters area for other regions:

  • Rise in snowline in winter-spring, possible increases in snowfall, earlier snowmelt, more frequent rain-on-snow – changes in seasonal streamflow, possible reductions in summer streamflow, reduced summer soil soil moisture
  • Stream temperature changes affecting species composition; increased isolation of coldwater stream fish

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