Lecture 23 - Lecture 23: Ecosystems Dr. Paula Lemons BIOL...

Info iconThis preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Dr. Paula Lemons BIOL 1104 Lecture 23: Ecosystems
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Learning Objectives Understand that energy flows unidirectionally through ecosystems while nutrients are recycled in ecosystems. Understand the concepts of gross primary productivity and net primary productivity. Understand trophic levels (producers and consumers) and the standard rate of efficiency of transfer of energy from one trophic level to the next. Understand what a biogeochemical cycle is. Understand factors that control nutrient cycling (including nutrient loss) from an ecosystem. Know the components of the carbon cycle and the nitrogen cycle.
Background image of page 2
Ecosystem Ecology Ecosystem – the organisms living in an area together with the physical environment with which they interact. Physical environment provides a repository of materials that move into and out of living systems (as we’ll see). How do (1) energy and (2) nutrients move through ecosystems?
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Energy Flow Through Ecosystems How does energy move through an ecosystem? Energy flows in one direction Energy enters the biosphere through sunlight. Energy is lost in the form of heat dissipating back to space. The planet is an open system with respect to energy.
Background image of page 4
CQ1:If the energy for our ecosystem comes from the sun, which of the organisms we’ve discussed this semester are making this energy available to the rest of the ecosystem? 1. bacteria 2. archaea 3. protists 4. fungi 5. plants 6. animals 7. 1-6 8. 1,2 5 9. 1, 3, 5 10. 1,2, 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Autotrophs = PRODUCERS Heterotrophs = CONSUMERS TROPHIC LEVELS
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Ecological Roles of Organisms Producers – are capturing energy and converting it into usable forms. “autotrophs” Consumers – are “eating” the forms of energy produced by the autotrophs. Decomposers – are consumers specializing in dead, decaying organic matter.
Background image of page 8
How Efficient is Energy Flow in an Ecosystem? How much of the energy captured by
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/07/2012 for the course BIOL 1104 taught by Professor Stanger-hall during the Spring '08 term at University of Georgia Athens.

Page1 / 33

Lecture 23 - Lecture 23: Ecosystems Dr. Paula Lemons BIOL...

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online