Download ECOSYSTEM ECOLOGY

22-1: COMMUNITY
PROPERTIES
PP. 435-439
Species (organism)
Population
Community (interaction of different species)
Ecosystem
Biosphere
PROPERTIES OF A COMMUNITY
1. Species Richness:
The number of
species in an area
PROPERTIES OF A COMMUNITY
1. Species Richness:
The number of
species in an area
2. Species
Evenness: the
abundance of
each type of
species
WHICH HAS MORE
SPECIES
RICHNESS?
WHICH HAS MORE
SPECIES
EVENNESS?
3. Species- Area Effect: larger areas
contain more species than smaller
areas (many different niches)
BIODIVERSITY
• The variety of
organisms in a
given area
BIODIVERSITY
• The variety of
organisms in a given
area
• Based on a
measurement of
species evenness
and richness
BIODIVERSITY
• 10-30 million species with most
biodiversity in insects
CALCULATING BIODIVERSITY
Biodiversity index =
# Species
# Organisms
CALCULATING BIODIVERSITY
Biodiversity index =
# Species
# Organisms
The closer to 1 the biodiversity index is, the more
diverse and healthy the ecosystem is (higher the
biodiversity)