GEOG 101 - Lecture 10 (Logistic Growth and Carrying Capacity)
There are lots of things that stop population from growing that include densitydependent factors
The logistic equation incorporates limits to growth and shows how a population
may stabilize at
GEOG 101 - Lecture 9 (Factors affecting Population Size)
Population size can be determined 2 factors:
1. Density-independent does not depend on density of population (ex. fire,
tornado, environment event that happens regardless of population size)
Some s
GEOG 101 - Lecture 8 (Population Growths)
This predicts the size of an exponentially
growing population at any time t, if we have
an
estimate for r and know N(0), the initial
population size
The
graph to the right is both the geometric and
exponential gro
GEOG 101 - Lecture 7 (Geometric vs. Exponential Growth)
Lambda ~ Geometric growth rate; also known as the (per capita) finite rate of
increase
When lambda = 1, the population is stable (population is replacing itself and not
growing)
When lambda > 1, incr
GEOG 101 - Lecture 6 (Exponential Growth)
Example: Loggerhead sea turtles
Endangered (threatened by development on nesting sites and commercial
fishing nets)
What affects population growth and size?
1. Complex way of reproducing - go back to where born
GEOG 101 - Lecture 5 (Growth in Populations)
Population size growing but there is bouncing around early on
Eventually, the slope of line is same = stable age distribution
The growth rate (lambda) can be
calculated as the ratio of the population
size in ye
GEOG 101 - Lecture 4 (Life Table Data)
Life table data can be used to project the future age structure, size, and growth rate
of a population
A population can be characterized by its age structure the proportion of the
population in each age class
Age st
GEOG 101 - Lecture 3 (Survivorship)
Survivorship is high until 70s-80s
Survivorship varies among human populations
In Gambia lot of females die before 5 years old
Different survivorship at different months
Hungry season : not a lot of food to go around.
GEOG 101 - Lecture 2
Example: Data for a life table for the grass
Poa annua were collected by marking 843
naturally germinating seedlings and then
following their fates over time
3 thing important for life table:
1. Survival rate (SX): age-specific; chanc
GEOG 101 - Lecture 1
All organisms live in populations
All organisms produce offspring and interact with future generations
There are benefits (acquire resources, production, alter environment someway)
There are negatives (competing with other individual