ENSC 320 Lecture Notes - Lecture 9: Blubber, Royal Penguin, Seabird
21 Aug 2016
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Document Summary
Variety of analogous terms, including non-indigenous, non-native, exotic, introduced, alien, feral. Invasive species are non-native species that have survived, reproduced and spread to the point of causing adverse ecological or economic effects. Generally defined as species proliferating outside their native range. Specific traits that allow them to out-compete native species. Look at history of colonization areas outside of old world". Potential commodity or resource: furs, food, timer, i. e american mink in europe. American mink fur thought to be more valuable. Control measure introduced to reduce certain species, even exotics: cane toad & cane beetle in australia. Domestic animal/cultivar release: i. e feral goats in the galapagos. Ecological impacts ecosystem modification resource competition aggression (and analogs) Nonnative species born in ballast or hulls of ships cost great lakes region. Black and norway rats consume stored grain and cause property damage >19 billion. >13 billion lost in agricultural production due to invasive insect species.
