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population dynamics

intor to pop dynamics
by

ted williams

on 14 September 2016

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Transcript of population dynamics

Exponential growth (J CURVE)
What does unchecked (NO BARRIERS) growth look like
Predators Food availability
A
population
is a group of individual organisms of the same species (animal; goblin shark, fennec fox, humans..) that live in an area, like Asheville. The term "population dynamics" refers to how the number of individuals in a population changes over time.
Population Dynamics: definition
S Curve
Natural Disasters
These are limiting factors that DO NOT depend on how many animals live in a given area.
Carrying capacity: The number of organisms that an environment can support
Do not grow in a Linear way






They experience
exponential
growth
How fast can a population grow?
Disease (Ebola) Territory






Density dependent means it matters how many animals live in the area
floods
Density independent factors:
1
2
3
DENSITY DEPENDENT FACTORS
4
WHAT IS CARRYING CAPACITY
5
6
7
8
DENSITY INDEPENDENT FACTORS
9
10
EQ: what controls how much a population can grow?
a
b
drought
wild fires
landslide
Summary (10 points): Explain the difference between density dependent and density independent factors
Identify each as either density dependent or independent and draw the graph (J or S curve that would represent the populations growth pattern if these pressures were present
predators
floods
disease
droughts
predictable: 1+1+1...
not 1+1...
2X2X4X8....
11
Logistical Growth
Full transcript