BIO 373 1st Edition Lecture18Outline of Last Lecture I. Practice Exama. reviewOutline of Current Lecture I. human microbiomesa. communitiesi. subset of speciesii. structureiii. diversityiv. Shannon indexv. Commonness and rareness Current LectureHuman Microbiomes- Communitieso Multiple species interactionso Collections of populations of different specieso Same time and placeo Emerging properties Hard to define in communitieso Classifications Biological characteristics- Use more dominant species to characterize Physical environmentThese 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: mountainso Ecologists use subset of species to define communities Taxonomic affinity- Limited to species Guilds- Group of species that use same resources even though they mightbe taxonomically distant Functional group- 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 useo community structure set of characteristics that shape a community properties- diversity and compositiono 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= # specieso Are species common or rare within communities? Abundance rank vs. abundance chart Commonness and rareness across communities- Species vs. relative abundance
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