BIOL 2060 Lecture Notes - Lecture 23: Invasive Species, Conservation Biology, Natural Disaster
16 Mar 2018
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Stability also depends on spatial scale: ex. Small scale = individual forest patch = unstable. Large scale = mosaic of forest patched = stable. Stability also depends on temporal scale: ex. Stable over the last 100 years but unstable over 1000 years. Stability also depends on frequency and intensity of disturbance: ex. Kelp forest: switching between barrens and kelp forests, each are considered separate/different stable states. Exploited ecosystem state: decrease in parrotfish, change in biomass of sea urchins, decrease in kelp. The diversity-stability debate: mathematical models suggest no, observations suggest yes, testing with long term ecological research (lter) experiments. Cedar creek lter experiments: allowed natural disaster to occur, looked at effects of severe 1988 drought on species richness, looked at different communities with different species richness. Effect of climate change in terms of diversity: diversity enhances resistance to climatic extremes.
