BIOL 3130 Lecture 6: Lecture 6
27 Oct 2017
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Document Summary
The homogenization of habitat conditions and species around the globe, as a result of human activity. Evolutionary: reverse speciation-when you bring species back together after separation; can have detrimental effects. Overgrazing: limit species diversity, one form of homogenization. Fire; hetergenization in nature, homogenizes grasslands and other areas: some species are adapting to fire, but once a forest fires becomes strong enough and hot enough, no life forms survive. Acid rain: nitrogen pollution biggest form, (cid:498)fertilizing(cid:499) the planet, homogenizes the planet, some species do well with fertilized but some do not. Case study: impact of nitrogen deposition on the species richness of grasslands. Areas with high levels of nitrogen have reduced diversity by 25% Every plant falls somewhere in the triangle. Diversity can be created by adapting to different types of stresses in the environment; heterogenization important. Environmental simplification- homogenization contributes to diversity loss.
