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POY Presentation: Food Webs

The Flow of Energy Through Ecosystems
by

Angel Rodriguez

on 1 November 2016

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Transcript of POY Presentation: Food Webs

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Dr. Angel Rodriguez
Environmental Science

Food Webs
The Flow of Energy Through Ecosystems
Learning Objectives
1. Distinguish among producers, consumers, and decomposers
2. Summarize how energy flows through an ecosystem
3. Discuss the importance of Krill to the Antarctic Food Web
4. Recognize the Power of ONE
Learning Activities
1. Food pyramid activity
2. Antarctic Food Web activity
The Flow of Energy Through Ecosystems
Energy Flow
Energy passes linearly in a one-way direction through an ecosystem, as part of a food chain and is lost. - 10% Rule
Food Chain
A diagram showing linear feeding relationships
grass > mouse > snake > eagle
Ecological Pyramids
A graphical representation
designed to show how energy
moves through an ecosystem
1. Trophic Levels
2. Number of Organisms
3. Biomass (Energy)
Case Study: Antarctic Food Web
Food Web
A complex of interconnected food chains in an ecosystem.
Microscopic algae (phytoplankton) are the base.
Krill eat the algae.
Various organisms eat Krill.
Video: Learn about the Antarctic Food Web.
What have we learned?
1. To distinguish among producers, consumers, and decomposers
2. To compare and contrast food chains and food webs
3. To summarize how energy flows through an ecosystem
4. The importance of Krill to the Antarctic Food Web
5. Never underestimate the Power of ONE!
Questions?
Trophic levels:
Links in a food chain
Case Study:
Human Impact on Antarctic Food Web
Ozone thinning has damaged algae.
Commercial fisherman harvest Krill. – Learn more at:
http://swfsc.noaa.gov/AERD-whykrill/
Entire ecosystem may be in jeopardy, especially whale populations. Why?
Foldable Activity: What have you learned about the Antarctic Food Web?
http://www.teachersdomain.org/asset/lsps07_int_oceanfoodweb/
1. First trophic level: Primary producers - Plants
2. Second trophic level: Primary consumers – Herbivores
3. Third trophic level: Secondary consumers – Carnivores
4. Fourth trophic level: Tertiary consumers – Top Carnivores
Decomposers are at every level.

What have we learned?
Answer the following questions using your pyramid:

1. What are two terms used to describe organisms such as Phytoplankton?
2. What are two terms used to describe organisms such as Krill?
3. What are two terms used to describe organisms such as Killer Whales?
4.What is the impact humans may have in the Antarctic ecosystem by harvesting krill?

http://www.csolomon-law.com/transfer/Pyramid_01.htm
Foldable Activity:
What have you learned about the Antarctic Food Web?
Full transcript