Chapter 25: Populations and Ecosystems
Concepts
The Structure of Populations
Plants in Relationship to Their Habitats
The Structure of Ecosystems
Biotic Components of the Habitat
Abiotic Components of the Habitat
Age Distribution: Demography
r and K Selection
Geographic Distribution
Species Composition
Trophic Levels
Temporal Structure
Physiognomic Structure
Community
Ecosystem
Population
Individuals of the same species that stay together
All the populations of plants and animals together
The physical, nonliving environment of the community
Habitat
set of conditions where an organism completes a life cycle
Nonliving physical phenomena
Latitude
Altitude
Soil
Disturbances
Climate
Living Factors
Protists
Prokaryotes
Fungi
Animals
Other Plant Species
The plant itself
Clumped Distributions
Uniform Distribution
Random Distribution
Allelochemics
Allelopathy
Limiting Factor
no obvious pattern
Small or large space between plants
Orchards and Tree Plantations
The relative portion of young, middle, and old aged individuals
K Selections
R Selections
redwoods, douglas firs, bristle cone pines
annuals, small shrubby perennials
The size of the organism and its relation to the environment
Changes an ecosystem undergoes over time
number and diversity of species that coexist in an ecosystem
Secondary Consumers (Carnivores)
Decomposers
Primary Consumers (Herbivores)
Primary Producers (Autotrophs)
