BIOLOGY 3SS3 Lecture 4: popgrowth.handouts.pdf
10 Mar 2015
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1. 1 dandelions: start with one dandelion; survive to reproduce. it produces 100 seeds, of which only 4% 1. 2 gypsy moths: a pest species that feeds on deciduous trees, introduced to n. america from europe, capable of wide-scale defoliation. Moth calculation: researchers studying a gypsy moth population make the following es- timates: The average reproductive female lays 600 eggs. 1. 3 bacteria: imagine we have some bacteria growing in a big tank, constantly di- viding and dying: They divide (forming two bacteria from one) constantly at a rate of 0. 04/ hr. They wash out of the tank (constantly) at a rate of 0. 02/ hr. They die (constantly) at a rate of 0. 01/ hr: rates are per capita (i. e. , per individual) Bacteria, rescaled: imagine we have some bacteria growing in a big tank: They divide (forming two bacteria from one) at a rate of 0. 96/day. They wash out of the tank at a rate of 0. 48/day.
