BIOL 121 Lecture Notes - Lecture 26: Ecosystem Diversity, Habitat Destruction, Invasive Species
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BIOL 121 Full Course Notes
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Number of species in a given area: diversity. Number of species and relative abundance: genetic diversity. Total genetic information contained within all individuals of a species, measured as the number and relative frequency of all alleles present in a species: species diversity. Based on the variety of species on earth can measure number and relative fq of species in a region: ecosystem diversity. Variety of biotic communities in a region along with abiotic components, such as soil, water, and nutrients. Space and time (2: alpha: biodiversity here" or within one community, beta: biodiversity here" vs. there" (or now" vs. later") e. g. of beta biodiversity in forest diversity changes. Year 3: there are many saplings and flowers. Year 100: canopy has closed in and therefore flowers and shorter plants not exposed to sun as much and die off. Year 300+: old growth old trees fall, allowing more sunlight to hit the ground and new species arise.
