AP Bio

Life History (2)

traits affecting when an organism reproduces and survived + Lifecycle

Variables of Life History

Age of when they mate, how often they reproduce, # of babies every time they mate

Costs of reproduction

Less reproductive potential because of obstacles (can’t reproduce repeatedly, make a big family, care and compete, escape predators and get food easily)

Semelparity

focus on reproducing once then die (many young, less stable environment)

Iteroparity

produce offspring multiple times over seasons (less offspring but bigger size, stable environment)

r strategist

early 1st reproduction, and many offspring, no parents, short lives and prone to extinction

k strategist

reproduce when older, less offspring, parents, long generations

Population crash

population greater than carrying capacity

population density (dependent)

affect a population the more it grows (competition)

population density (independent)

affects population regardless of size (weather)

Population dynamics

changes in population due to biotic and abiotic factors