BIO120H1 Lecture Notes - Lecture 21: Exponential Growth, Diminishing Returns, Coevolution
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BIO120H1 Full Course Notes
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Think back to the lotka-volterra model of inter-speci c competition. Population dynamics of mutualism: [lotka-volterra models of mutualism] lead to silly solutions in which both populations undergo unbounded exponential growth, in an orgy of mutual benefaction. may r. 1981. Theoretical ecology: what limits the population growth of mutualists, strong intra-speci c competition, a third species such as a predator or a competitor, diminishing returns to mutualism as the population grows. Presence of cleaner sh in reefs affects species diversity of other reef sh: studied natural variation in cleaner sh presence/absence, also added/removed cleaner sh, grey = short-term (2-4 weeks), white = long-term (4-24 months) Co-speciation: as aphids speciate, so do their bacteria. Mirror-image phylogenies of aphids and buchnera imply a single origin of the symbiosis (~200 mya), followed by repeated cospeciation of aphids and bacteria. Characterizing microbial diversity in a host (or environmental sample: sequencing-based methods, sequence a highly conserved (i. e. , slowly evolving) gene, usually the bacterial.
