BIOLOGY 290 Lecture Notes - Lecture 10: Logistic Function
6 Oct 2016
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Bio 209 9/29 sustainable harvest of wild foods. Many things are harvested wildly: fish, herbal medicine, berries. Now, there have been increased efforts to farm things that we have been solely getting from wild populations: for example, some efforts have been made to farm tuna (99% of tuna is still from wild populations) Humans are not very good at sustainably using wild populations. How to regulate how much you take from a wild population: establish a set quota regulate total amount of harvest. Recruitment: how many metric tonnes of fish does the population produce in excess of its present population each year. To get maximal sustainable yield, want to set a fixed quota at the point of recruitment; however, if because of variation, population gets smaller than recruitment ability at k/2, it will crash. If the fixed quota is set below the bell curve of annual recruitment, there will be two intersection points on the graph.
