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Population and Ecosystem (The Structure of Ecosystems (Species Composition…
Population and Ecosystem
Plants in Relationship to their Habitats
Abiotic components of the Habitats
Climate
Soil Factor
Latitude & Altitude
Distrubance
Biotic component of the Habitats
Plant itself
Other plant species
Organisms other than plants
unaffected
predation
harmed
The Structure of Populations
Age Distribution Demograpy
generation time - length of time from the birth off one individuals until birth of its first offspring
intrinsic rate of natural increase or biotic potential
two factors affect the possible rate of population growth
Geographic Distribution
Boundaries of geographic Ranges
Local Geographic Distribution
random distribution
clumped distribution
r- selected & k-selected
r- selected
adaptive in r- sites
annual
early maturity
many small seeds
few mechanical or chemical defense
k-selected
adaptive in k- sites
perennial
late maturity
few, large seed
many defense
The Structure of Ecosystems
Temporal Structure
the change in ecosystem with time
Species Composition
number & diversity of species that coexist in an ecosystem
depends wether the climate is mild or stressful, soil is rich or poor
Physiognomic Structure
size, shape, distribution relation of the distribution of organisms
life form
Trophic Levels
feeding level
primary consumers
secondary consumers
primary producers
decomposers
