BIOL 2260 Lecture 8: Lecture 8 Notes
5 Jul 2016
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Sex ratio: the ratio of males to females in a population. Reported as m/f, m/100%, %f or %m. For sexually reproducing populations, biologists often only track females: mx in life tables is daughters only o. R0 is interpreted as the average number of daughters produced per female in her lifetime o. R0(# of females) = # of female snakes produced. Number of female snakes produced multiplied by the ratio of males to females. Supposed to be the slowest breeder of all known animals. Breed at 30 years old, until 90 years old o. They produce three pairs of offspring in this interval (six in total) Different sex ratio"s lead to different population growth rates. Sex ratios can be biased because of: o o o o. They differ across age classes mostly due to result of sex differences in survival. Sex-biased mortality skews the third and fourth degree sex ratios in favour of a sex with the higher survival.
