BIO120H1 Lecture Notes - Lecture 11: Cane Toad, Invasive Species, Introduced Species
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Biological invasions: the successful establishment of a species in a region not previously occupied followed by rapid range expansion, do not always involve harmful species, but most do* Native an indigenous species that occurs wild in a given region. Alien a species that has been introduced to a part of the world to which it is not native; also referred to as adventive, exotic, or simply introduced species. Invasive species in the usa: economic cost = billion/year, 50,000 introduced species, number rising, ~ 42% of threatened and endangered species at risk primarily due to alien invasives. Common attributes of successful invasive species: rapid development to reproduction. Evolution in invasive species of agriculture: selection of barnyard grass plants that mimic cultivated rice (se asia, selection of herbicide-resistant weed species (worldwide) Weeding practices in rice: weed removal involves the ability to distinguish visually between crop and weed, weeds that look more like the crop escape detection inadvertently selecting for mimicry.
