An oak tree is more than a tree. To biologists, a mature oak is essentially a vertical ecosystem — a high-rise apartment block hosting hundreds of permanent and transient residents.
The English oak (Quercus robur) supports the highest biodiversity of any UK tree, with documented populations of over 2,300 species using it for food, shelter, or breeding. Of those, around 326 species depend on oaks specifically — meaning they cannot survive without them.
Who Lives There
- Insects: 257 species of beetles, 38 species of moths whose caterpillars eat oak leaves
- Birds: Jays, woodpeckers, tawny owls, treecreepers
- Mammals: Squirrels, dormice, badgers (acorns), deer (browse)
- Fungi: 108 species, including those that form essential mycorrhizal partnerships
- Lichens: Up to 716 species can grow on oak bark
Lifespan
An oak grows for 300 years, lives for 300 more, then takes 300 years to die. Even a fallen oak continues to host hundreds of species for decades as it rots into the soil.
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