BIO 373 1st Edition Lecture18 Outline of Last Lecture I Practice Exam a review Outline of Current Lecture I human microbiomes a communities i subset of species ii structure iii diversity iv Shannon index v Commonness and rareness Current Lecture Human Microbiomes Communities o Multiple species interactions o Collections of populations of different species o Same time and place o Emerging properties Hard to define in communities o Classifications Biological characteristics Use more dominant species to characterize Physical environment These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Ex mountains o Ecologists use subset of species to define communities Taxonomic affinity Guilds Group of species that use same resources even though they might be taxonomically distant Functional group Limited to species A subset of a community that includes species that functions in similar ways but do not necessarily use same resources different trophic levels defines groups of species dependent on how much energy they use o community structure set of characteristics that shape a community properties diversity and composition o diversity combines richness number of different kinds of species and evenness how abundant each species is for example species A and B have same richness but difference abundance evenness o Shannon Index See formula from slides H index value diversity indicator Pi proportion of index in the species S species o Are species common or rare within communities Abundance rank vs abundance chart Commonness and rareness across communities Species vs relative abundance plot
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