LIFESCI 1 Lecture 17: LS1_17.pdf
21 Jan 2015
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Biodiversity: 2 ways to measure diversity of a community, 1. ) Species richness # of species in a community: 2. ) Species diversity weighted measure that includes whether a species is present and its relative abundance. Species richness + relative abundance: example: mushrooms, species richness is lower in a: 3 species versus 4, species diversity is higher in b: abundances are more equal among species present (better balance) In b: equal abundances of 4 mushroom species. In c: unequal abundances of 4 mushroom species. Not as diverse as b: tilman"s experiments, planted plots with varying numbers of native prairie species, measured total above-ground biomass 3 years later as a measure of npp. Jackpot theory: more species leads to a higher probability of having a species that grows particularly well: 2. ) Niche complementarity: more species leads to more functional groups, which leads to better use of resources.
