Biology 2485B Lecture Notes - Lecture 4: Sympatric Speciation, Allopatric Speciation, Extinction Event
12 Apr 2019
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Document Summary
Biodiversity: the total variety of all organisms in an area, taking into account the diversity of species, their genes, their populations, their habitats and their communities. Total variability of life : biodiversity exists at multiple levels, ecosystems, species, within any species, there will be differences in the genetic makeup, genes. If they can, they are considered the same species. Figure 1: black dots = global groups. Figure 2: shows the breakdown of described life forms and species among all groups of organisms, the diversity of these groups is underestimated, a largely proportion of the described species are animals and insects, most things are insects. Species diversity tends to be higher where it"s : hotter, wetter. Species richness for vertebrates is greatest in tropical regions with abundant rainfall: how many estimated species of vertebrates are there, red/orange/yellow = higher diversity, hotter and wetter areas, blue/green/black = lower diversity.
