BIOL208 Lecture Notes - Lecture 14: Logarithmic Scale, Survivorship Curve, Frequency-Dependent Selection

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL208
• Professor: Jessamyn Manson

Document Summary

Birth, death, and dispersal (immigration and emigration) Estimate the number of students in the class and sex ratios. Always approximately found at a 1:1 ratio. Assuming that sex is somehow determined by genetics, there will be selection for sex. Environment (certain temperatures can affect gender of organism) and age can affect sex ratios. Tell us a lot about populations and when they"ve been successful at reproducing. Age class distributions can show you a lot about what"s going on in the community. Life tables quantify births and deaths in a population. Challenge: you have to follow the organism, which is difficult. (takes a lot of time, have to chase them etc. ) (expensive and complicated, usually not the most efficient way) Usually tracking the population in someway, or calculating the age of a population. Always going to be variation in these tables, but they give us a sense of what"s going on in the population.