ENVS195 Lecture Notes - Lecture 2: Ecosystem Diversity, Genetic Diversity, Overexploitation
2 Feb 2016
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Ecosystem structure is consists of individual, population, community, ecosystem, biomes (6) and biosphere. Endemic, exotic, immigrant, alien, keystone (maintain functions), specialist (narrow range) and generalist (wide range) Temperature and water are the most important two reasons. The result of the interaction between abiotic and biotic. y. Three scales: genetic diversity: has influences on health, species diversity: high estimation (5 to 20 million, ecosystem diversity: the more ecosystem area, the more ecosystem diversity. Why are species not evenly distributed: solar radiation (lower temperature, lake of water. Only have 54 endemic (the species can only find in some certain area) species. Glaciation period & wide range of existing species (these two factors explain why canada has low amount of. Five key points: terrestrial habitat (on the land) 2: pollution: nitrogen (a chemical factor, over-exploitation (land + sea, climate change. Alien species are not the same as invasive alien species!
