Graphs & Charts
Survival Curves
Graph of the probability of survival (x-axis) versus time (y-axis)
Type 1 Organisms
Have a lower mortality rate at lower ages which gradually increases with age.
Type 2 Organisms
Have mortality rates that stay the same throughout life.
Type 3 Organisms
Have the largest mortality rates at birth but eases into stable living after early stages of life.
Life tables
An age-specific death schedule. Such a schedule is often converted to a more palatable survivorship schedule. For each age interval there is a predicted life expectancy or survivorshio. These life tables also show fecundity (reproduction). From a life table, one can produce a survival curve.
Exponential Growth
Growth that increases exponentially over time and doesn't stop. This happens under Intrinsic Rate of Growth
Logistic Growth
Growth that crests after reaching carrying capacity(k) of environment.
Carrying Capacity
The carrying capacity is different for each animal soecies due to the size and needs of the species.
Intrinsic Rate of Growth
This is a state when a species has no limiting actors to it's survival, so it grows rapidly.
Logistic Growth Equation
dN/dt=rN((K-N)/K))
Exponential Growth Equation
dN/dt=rN
Age of Reproduction
the average age in an organism when it becomes capable of reproduction.
Post-Reproductive Organism
Organism that are not fertile enough anymore to reproduce.
Pre-Reproductive Organism
Organism that are not fertile enough anymore to reproduce.
Reproductive Organism
Organisms that are fertile enough to reproduce
R-selected organisms
Organisms that focus most of their energy into rapid growth and reproduction.