BIOL 2060 Lecture Notes - Lecture 13: Predator Satiation, Petroleum Jelly, Exponential Growth
7 Feb 2018
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What is exploitation: when it benefits consumer and harms prey/food (+/-, to obtain energy. Gause"s classic laboratory experiments: two protozoans enclosed in continuous growth medium (one prey and one predator, grew them on oat medium, predator drives prey to extinction, then starves due to lack of prey. If you have huge amount of prey, response from predator may change accordingly. Limitations of simple models: simplifying assumptions, homogenous environment. Systems include one predator species and one prey species (most have many different prey and predators) Stable equilibrium: outcomes of simple predator-prey models, oscillations, extinctions. What if habitat is not homogeneous: repeated gauss"s experiment but provided prey with a shelter by adding sediment into the medium, prey were able to hide and the predators starved. Gause: asked what are the effects of immigration, periodic immigrations of prey and predators >>avoided extinction, populations tended to cycle between low and high abundance, conclusion: predator-prey oscillations depended on interference from outside.
