BIOL 2804 Lecture Notes - Lecture 16: Keystone Species, Species Richness, Microorganism
28 Dec 2019
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Document Summary
Objectives: define community and community structure, species composition, understand richness and evenness as two components of biodiversity, understand and visually interpret rank abundance curves, understand and contrast simpson"s and shannon-weiner diversity indices. Communities are groups of interacting species inhabiting a given area or volume. Researchers often consider functionally specific parts of the total community. Who competes with whom?: what abiotic and biotic factors shape community composition. Species composition: the species composition of a community describes the set of species present and their relative abundances, consider that: there are 8. 74 million eukaryote species on earth, plus maybe 1 trillion microbe species. Describing biodiversity: species richness number of individual species/area (or volume, species evenness a measure of how equal the community s numerically. Species interaction networks: most often depict food webs: who eats whom, top predators nobody eats them, basal species primary producers. Intermediate species can be both predators and prey.
