BIOC63H3 Lecture : BGYC63 Oct04
Document Summary
Threats to biodiversity invasive species and thier effects on local communities. Invasive species: definition and scale of invasion. Native species: a particular species that historically occurred or currently occurs in an ecosystem. Introduced species: a species that is new to a habitat (that has immigrated) that didnt occur before (it is just new, dont say the effect) Invasive species: a species that is also new to the area, but has a negative effect to the native species. Biological incation; the movement of species from one area to another new area. Since humans started to move around, the amount of species invasion has risen. The more people travel, the more species get moved around. When you look at the makeup, 22% of species in canada is alien, and in ontario, 32% is alien! When you compare this to islands, it is even higherin ascension, it is 82%
