population

• Population - group of individuals, of the same species, occupying a particular space at the same time, sharing the same gene pool
• Biological species concept

  
  

  1. must have the potential to interbreed
  2. must produce healthy, fertile offspring
• demography - study of the vital statistics of a population and how they change over time
• age = age distribution
• sex = sex ratio
• size = density, abundance, commonality or rarity
• behavior = spatial or temporal distribution
• birth = natality
• death = mortality
• reproduction = reproductive value
• feeding = energy allocation
• development = population growth
• Density is the result of a dynamic interplay between processes that add individuals to a population and those that remove individual from it 
• natality - population process that add individual to a population
• mortality - removes individual from the population (death and emmigration)
• 1. life tables
  2. survivorship curve
  3. age structure and sex ratio pyramid
• 1. Life tables – a record of the birth and death rates at different life stages
• demographic factors: birth, death, immigration, emigration