ecosystem i - wou homepageguralnl/101ecosysi.pdf · • trophic levels • food webs/chains. what...
TRANSCRIPT
Ecosystem I
• What is an ecosystem?
• Types of Ecosystems• Productivity• Energy Flow• Trophic levels• Food webs/chains
What is an ecosystem?
• Ecosystem =
• Community + abioticcomponent
• Energy Flow• Chemical cycling
• No discrete boudaries
Types of Ecosystems
Ecosystem productivity
Energy Source for Ecosystem
• Energy flows through ecosystem
• Not recycled like matter
• Continuous supply• Solar energy
Primary ProductivityEnergy Enters ecosystem throughphotosynthesis
Productivity
• Limits to Primary production
• Light• Nutrients• Water• Temperature
Limitations
Energy Flow
Trophic levels
• Autotrophs(Producers)
• Heterotrophs(Consumers)
• Detritivores(Decomposers)
Energy & Biomass
Food webs/chains
Limits to Food Chain Length• Energetic Hypothesis
• Inefficiency of energy transfer
• 10% rule
• Dynamic stability hypothesis (length of chain)
Applications Biomagnification
Toxic materials: DDT, Hg, Pb
Human trophic Level
Dependent of where weEat in the food chain.