Researchers visited 40 parcels in 5 sugar maple forests in the understory of sugar maple forests in southern Quebec in Canada, finding earthworms in half of all the sites.
Their analysis uncovered a correlation between the number of earthworms and the abundance and diversity of certain understory species.
New shoots of red maple, striped maple, American beech, and two fern species became rarer as earthworm populations increased. The presence of earthworms does however seem to be good for ash trees and grasses.
The findings were published in the journal Forest Ecology and Management.


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