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How do squirrels help disperse acorns?
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seed
Fruit and seeds of the southern magnolia (Magnolia grandiflora). The fruit is an aggregate of follicles, and each follicle bears a single red seed.
Squirrels play a significant role in the dispersal of acorns through a process of food caching, which creates a symbiotic relationship between the animals and the oak trees.1
- Caching and Forgetfulness: Squirrels collect and bury acorns in various locations to store food for later use. While they are often organized in their storage strategies, they frequently fail to recover all of their buried caches. These forgotten acorns are then left in the soil, where they have an excellent opportunity to germinate and grow into new trees.21
- Unintentional Dispersal: Even when squirrels do recover their caches, they may only partially consume the acorns. Research indicates that if the embryo remains undamaged, these partially eaten acorns can still successfully sprout, meaning squirrels disperse a wider range of seeds than just those they completely abandon.1
- Secondary Dispersal: Squirrels may also act as secondary dispersers by stealing acorns that have been embedded in tree bark or other locations by birds, such as woodpeckers, and subsequently burying them in the ground.34
This behavior effectively moves the plant reproductive part away from the parent tree, reducing competition for resources and allowing the species to colonize new areas.1