Slide 1
Earthworms change soil by eating and burrowing
Earthworms consume organic matter and soil material. Their feeding and burrowing alter the ground through which roots, water and other organisms move.
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The material leaving a worm has been processed and rearranged. Earthworms therefore influence physical structure as well as the availability and distribution of nutrients in their habitat.
Slide 2
Their tunnels carry air and water through the ground
Earthworm burrows can provide routes for air and water through soil. Different species occupy different depths and use different feeding habits.
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Some live near surface litter, while others make deeper burrows. A community's effect cannot be predicted simply by counting all worms as identical workers with one way of moving soil.
Slide 3
These changes can benefit garden plants
Earthworm activity can improve conditions useful to many garden plants. Mixing and decomposition are familiar reasons gardeners value their presence.
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That outcome is not a universal measure of ecological benefit. Plants adapted to another soil structure may respond differently, especially where the original community developed without abundant earthworms.
Slide 4
Introduced worms can remove a forest’s leaf-litter layer
Introduced earthworms can rapidly consume leaf litter in some northern forests. That changes the surface habitat used by seedlings and small animals.
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Many northern areas once covered by glaciers developed forest communities without native earthworms after the ice retreated. Introducing them can therefore change an established system rather than merely add a missing helpful species.
Slide 5
Moving soil or bait can carry the effect elsewhere
Soil, plants, compost and discarded fishing bait can transport earthworms. Human activity can move these soil-altering organisms into new ecological settings.
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Recognizing local species and context matters more than declaring all worms good or bad. The same type of process can support one plant community while disrupting another's structure and regeneration.
Sources
- Deer, Worms, and Invasives
National Park Service
- Species Spotlight: Crazy Snakeworm
National Park Service