220_Lecture_Community_Ecology_II

220_Lecture_Community_Ecology_II - Community Ecology II...

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Community Ecology II LAND/SOCR 220
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ommunity ecology context Community ecology context nteractions of populations Interactions of populations – +/+, +/-, -/- types of interactions –adaptations for this “biological” environment • Dynamics of interactions – Predation: Lotka-Volterra equation, functional responses – Competition: resources, Volterra equation, oexistence allelopathy coexistence, allelopathy – Coevolution & Mutualism: antagonisms, types & examples of coevolutionary & mutualistic systems
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ommunity ecology context Community ecology context hole community structure Whole community structure – natural unit of ecological organization? ood webs – food webs – trophic cascades • Today: Community Development – Succession: patterns & mechanisms
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auerkraut Recipe Sauerkraut Recipe • 10 lbs shredded green cabbage • 6 tablespoons canning or pickling salt • Mix ingredients in a 5 gallon stone crock. Salt will release juices & cover cabbage leaves. • Keep top leaves submerged beneath a weighted dinner plate or water-filled bag to rotect from air protect from air. •K e e p a t 7 0 ° F for 5-6 weeks. Optional: remove scum twice weekly.
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Stages in Sauerkraut development alt addition generates osmotic imbalance Salt addition generates osmotic imbalance that drives water out of leaves. xpelled fluids are food for microbes • Expelled fluids are food for microbes (spores were on the cabbage in the first lace) place) • All dissolved oxygen is consumed rapidly, so only fermentative microbes survive • Cabbage sugars Æ lactic acid + CO 2
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Ecological succession in sauerkraut H pH Leuconostoc mesenteroides Lactobacilus pentoaceticus Time dance Lactobacillus cucumeris bun d A
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Mechanism underlying succession in microbes roduces lactic acid as a Leuconostocproduces lactic acid as a by-product of fermentation H goes down until it is too low for pH goes down until it is too low for Leuconostoc ecomes Lactobacilluscucumerisbecomes dominant, and continues to produce lactic acid . . .
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220_Lecture_Community_Ecology_II - Community Ecology II...

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