BIOB50H3 Lecture Notes - Lecture 21: Introduced Species, Invasive Species, Harmful Insect
4 Nov 2016
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Document Summary
Invasive species: an introduced species that survives and reproduces in its new environment, sustains a growing population, and has large effects on the native community. Introduced species: a species which is transported to a new area intentionally or unintentionally from its native range (mostly agricultural plants, etc. and is important to the human economy, health/welfare) most species can"t survive without human intervention. Facilitation from some species, tolerance/inhibition from others. Increased as human population and travel have grown. Very few species that are introduced become invasive. Very rare for introduced species to become invasive species. Only about 0. 1% of introduced species become invasive! No evolved mechanism to help keep species in check (e. g. lost alleelopathic plant defenses) Empty niches easy dispersers (air/water) are likely to go onto islands. Humans introduce species to islands and they have defenseless plants/animals that are not used to invasive species.
