20 Lec 20 Ecological concepts

20 Lec 20 Ecological concepts - Applications of Ecological...

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Applications of Ecological Concepts Jennifer Pett-Ridge time # of animals S curve of population growth
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Historical disconnect between ecologists and microbiologists Microbes difficult to observe in nature Tools and disciplines of ecology are not common in microbiology Ecology relies on models due to complexity of interactions in communities/ecosystems Microbial models are rare
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Do microbial communities make good model systems? Benefits Simple High replication Highly controlled Ample genetic and physiological data Small organisms Short generation time, can manipulate and store long-term Drawbacks Overly simplified Too small spatial and temporal scale Ultimate test: prediction of behavior in an ecological system
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Topic 1: Competitive interactions Expt 1: Two ciliates -Structured system = coexistence -Well-mixed system = whole system crash Theory: predator prey model Reality: extinction bacteria protozoa time population density Expt 2: soil bacteria and protozoa
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(Forde et al 2004) •@ 24 hrs, B 1 productive = 5 X (B 1 int. or low) •Day 5: T7 1 invades productive •Day 7: T7 1 invades intermediate •Day 11: T7 1 invades low B o B 2 B 1 T7 T7 1 Kill and lyse Bacteria Phage Effect of spatial structure on coevolution Showed selection mosaic across experimental landscape Variation was greater in closed communities Competition: Expt. 3 How does coevolution organize biodiversity over complex landscapes?
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Multi species community Methanogenic bioreactor Archeal OTUs Bacterial OTUs
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This note was uploaded on 04/02/2010 for the course ESPM 131 taught by Professor Pallud during the Spring '10 term at University of California, Berkeley.

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20 Lec 20 Ecological concepts - Applications of Ecological...

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