Alder
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Alder is a riparian tree species that can grow up to 100 feet tall. It has alternate toothed leaves, catkins for reproduction, and ash grey bark. Alders play an important role in stream ecology by starting the food chain in lotic systems, regulating stream temperatures with their canopy cover, and providing crucial nitrogen fixation through symbiotic bacteria.
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Alder
- 2. Characteristics • Alternate toothed leaves, sometimes doubly serrate • Catkins • Ash grey bark • Up to 100 ft • Riparian species
- 3. Ecology • Important to stream ecology • Leaves start food chain in lotic systems • Canopy of alders is important in temperature regulation of streams • Nitrogen fixation by symbiotic bacteria is crucial to nitrogen cycle • Riparian trees provide important food and cover for a variety of mammals and birds on our list