Population Dynamics & Life Histories

All populations are ​ (a)   meaning that they can change in size and composition over time.

• dynamic
• small
• large
• forests

Compare Birth Rate vs. Death Rate & Life Expectancy

Groups:

(a) Birth Rate

,

(b) Death Rate

,

(c) Life Expectancy

• the length of time an individual is expected to live.

• the number of deaths in a given period of time

• The number of births occurring in a given time period.

___ ________ is the distribution of individuals among different ages in a population.

• Age Structure

• Survivorship Curve

• Death Rate

• Birth Rate

These are often presented in graphs.

​ (a)   show the likelihood of survival at different ages throughout the lifetime of the organism.

• Survivorship Curves
• Mortality
• Water
• Winter

Organize these options into the right categories

Groups:

(a) Type I Survivorship Curve

,

(b) Type III Survivorship Curve

,

(c) Type II Survivorship Curve

• Example: Fish

• The probability of dying does not change throughout life.

• It flattens out as death rates decline for the dew that do survive the early die-off.

• This curve is intermediate to the other two curves.

• Is flat at the start indicating a low death rate in the early and middle stages of life.

• Drops steeply near the end indicating a high death rate as the organisms become older.

• There is a constant death rate over the organisms life span.

• This includes organisms that produce large numbers of offspring byt provide them with no care.

• Example: Large mammal that produce few offspring but provide them with good care.

• Example: Rodents and Lizards.

• This curve drops sharply at the start, indicating a high death rate among the young.

The ____ _______ of an organism is the traits that affect an organism's schedule of reproduction and survival.

• Repeated Reproduction

• Reproduction rate

• Life History

• None of these

​ (a)   reproduction happens when an organism produces all of its offspring in a single event.

• Big-Bang
• Repeated