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Climate Change from an
Ecological Perspective
Steven T. Rier
Dept. of Biology and Allied health
Photo by Chris Vogel
An ecological perspective?
organisms (animals, plants, and microbes)
interact in and with the natural world
Ecosystem example
Sunlight
Photosynthesis
Cycling of Carbon, Nitrogen, & Phosphorus
Humans are a part of ecosystems
Functional Ecosystems
• Balanced, adaptive, and diverse assemblage of
organisms
• Often provide functions essential for humans
– Detoxify pollutants in water
– Lessen the effects of flooding
– Pollination of crops
Effects of climate change on
ecosystems are complex
Human Population
Industry and transportation
Agriculture
Land use/ cover changes
CO2 Increase
Global climate change
Loss of ecosystem
integrity
Other human-caused disturbances
•Altered nutrient cycles
•Pollution
•Spread of exotic species
CO2 Increase
Global climate change
Loss of ecosystem
integrity
Direct effects of elevated CO2 on Plants
Increased production of C-based
compounds
More carbohydrates
More fiber
More tannin
Less protein
Effects of elevated CO2
on ecosystems
CO2 Increase
Global climate change
Loss of ecosystem
integrity
Global climate change
Warming
Extreme weather events
Loss of ecosystem integrity
Drought
Human Population
Industry and transportation
Agriculture
Land use/ cover changes
CO2 Increase
Global climate change
Loss of ecosystem
integrity
Other human-caused disturbances
•Altered nutrient cycles
•Pollution
•Spread of exotic species
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