CADDIS Volume 2: Sources, Stressors & Responses
Urbanization & climate change
An increasing number of studies are considering the potentially interactive effects of urbanization and climate change on stream ecosystems (Palmer et al. 2009). Some studies have focused on interactions between urbanization and climate change-associated changes in precipitation and runoff (Kaushal et al. 2008, Franczyk & Chang 2009, Han et al. 2009); others have examined interacting effects on stream temperature.
- Water temperatures were highest under the scenario of increased urbanization plus a warming climate, especially in midsummer when there was heated runoff from impervious surfaces (Fig 31).
- Water temperatures exceeded the “good growth” temperature maximum for coldwater fish species (28°C) on an average of 49 days per 10-year period under the urbanization plus climate change scenario, vs. 24 days per 10-year period in the urbanization alone scenario (Fig 32).
- Water temperatures exceeded the “good growth” temperature maximum for coolwater fish species (32°C) only rarely, and only in the urbanization plus climate change scenario.
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