One reason for their spread: Fishermen tossing bait
(NEWSER) - Worms may seem like they would be natural friends of the forest, but some alien invaders are causing problems in the Northeast, say researchers at Colgate University. When exotic species of earthworm are introduced to America's northern forests, they chow down on the organic "forest litter" on the ground, which not only raises the risk of soil erosion but changes the dynamics of the eco-system for native plants and animals, reports the BBC . More»
