Population Distribution

1
Population Distribution Abundance
Ch. 8
2
Objectives

• Populations
• Abundance
• Geographic range
• Niches

3
Population
4
Abundances change over time space
5
Dispersal

• Plants disperse via seeds
• Anemochory (air)
• Zoochory (animal) endo ecto
• Hydrochory (water)
• Self (rolling, ballistic, drop)
• Need to disperse to appropriate environment
• Animals disperse via emigration

6
Habitat suitability
7
Habitat Suitability
8
Geographic ranges vary in size
9
Populations can be patchy
10
Abundance varies throughout a species range
11
Multiple factors influence niche size