BIO220H1 Lecture Notes - Lecture 15: Inflection Point, Trophy Hunting, Atlantic Cod
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BIO220H1 Full Course Notes
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Document Summary
Simple models of species growth and harvesting strategies dn/dt= r* n * [(k-n)/k] As n approaches k, k goes to 0 so as a population approaches its carrying capacity, it approaches 0. If n really small, it"s going to be some number close to k ~1. Per capita rate of increase= decline as pop gets bigger because getting closer to carrying capacity. Ideal harvesting strategy: harvest k/2 individuals/year, so population is at max growth rate. Theoretically ideal scenario harvest individuals of each species/year, so allow harvesting and self- sustaining populations. Going to go through a best-case scenario where we don"t account for random chance, weather, predation, etc. Left side of the line is unstable and it is the maximum economic yield (mey) (little star) Right side of the line is unstable and maximum sustained yield (msy) (big star) There is always economic pressure to harvest so most fisheries tend to fish until they collapse.
