ENSC 320 Lecture 9: Invasive Species

• School: Queen's University
• Department: Environmental Studies
• Course: ENSC 320
• Professor: Ryan K Danby

Document Summary

Variety of analogous terms, including non-indigenous, non-native, exotic, introduced, alien, feral. 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. Ability to reproduce both asexually as well as sexually. Tolerance of a wide range of environmental conditions (generalist) Ability to live off a wide range of food types. Brown trout outcompetes native fish in new zealand streams. Control measure introduced to reduce certain species, even exotics a. Sea lamprey native to atlantic ocean, moved into great lakes with construction of shipping canals. Difficult to accurately quantify, but estimates do exist: Invasive species cost the us -140 billion annually in direct cost. Related to all species (vertebrate, arthropods, mullusks, plants, fungi, microbial pathogens) Nonnative species borne in ballast or hulls of ships cost great lakes region > million annually in direct control.