GEOG 1265 Lecture 17: Lecture 17
9 Mar 2017
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Invasive alien species: non-native species (alien) to the system considered, introduction likely causes environmental, economic, or human health harm, introduced intentionally or unintentionally by humans, animal, plant, microbe, etc, examples, european starling: 1950s: introduced into hawaii, venomous, preys on native lizards, birds, increases insects and spiders, climbed trees and power poles power outages, salt cedar (tamarisk): Introduced from eurasia as an ornamental tree in early. 1800s: aggressively displaces native riparian species, produce massive number of wind-dispersal seeds, force out cottonwoods and other native species (loss of habitats, take up lots of water (overdraft ground water, lowers water table; salinifies soil, kudzu: Introduced from asia for forage and erosion control in late 1800s (cid:498)the vine that ate the south(cid:499: aggressively covers vegetation, structures, etc, difficult to eliminate, cheatgrass, accidentally introduced as a contaminate in seed from. Hunting and gathering groups: tasaday, philippines island, kung bushmen, south africa, native amerindians. Factors that contributed to the development of sedentary agriculture:
