ENVB 210 Lecture Notes - Lecture 21: Adsorption, Germination, Protozoa
7 Feb 2018
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17 species in eastern canada, mostly coming from europe. They are not necessarily optimal for the ecosystem. Can go extremely deep and expand their territory 2 meters a year. Composed of soil and om material made highly digestible for bacteria. Precipitation: earthworms come out of the soil when it rains because they are aerobic organisms. When soil is saturated with water, they come out to get oxygen. If there are a lot of petioles. (cid:894)earth(cid:449)or(cid:373)s do(cid:374)"t eat ste(cid:373)s(cid:895) Midden piles: earthworms bury litter in the ground by gathering material and pulling it into their burrow. They leave a stack of leaves in the entrance to prevent too much water from entering. Note: this behavior increases nutrient cycling, which is beneficial. Burrows can go very deep into the soil (at least 1m) Earthworms modify patterns of leaf distribution on the bare soil. Depending on the situations, having earthworms in the soil can be very beneficial or not as good.
