EE BIOL 100 Lecture Notes - Lecture 13: Net Reproduction Rate, Semelparity And Iteroparity, Secondary Sex Characteristic

• School: UCLA
• Department: Ecology and Evolutionary Biology
• Course: EE BIOL 100
• Professor: Gorlitsky, L.E.Lipman, A.J.

Document Summary

High population growth since all indivs able to reproduce: asexual costs genetic recombination/variation loss. Decreased ability to respond to environmental changes since no variation: sexual benefits genetic recombination/uniqueness increased ability to respond to environmental changes b/c variation, sexual costs. Triggered by size, sex ratio of population i. e. fish. Monoecious: indivs that have separate m and f flowers on same plant, imperfect flowers fecundity. Positive relationship between f body weight and # of eggs per brood based on life tables! Life tables x = age from birth lx = probability of indiv surviving to age x sx = probability indiv at age x surviving to next age (x+1) bx = avg # offspring f produces at age x. R0 = sum of lxbx = net reproductive rate. Early maturation if adult survival is reduced compared to juvenile survival. Delayed maturation if juvenile survival is reduced compared to adult survival.