alder
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Alder
Alnus sp
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Characteristics
• Alternate toothed leaves, sometimes doubly serrate
• Catkins
• Ash grey bark
• Up to 100 ft
• Riparian species
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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
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