Lecture Slides: Ch 19.4-20.1: Community Ecology and Energy Flow through Ecosystems

19.4 Community Ecology

Distinguish between biological communities and ecosystems
Describe and provide examples of the types of interactions within a community (i.e., competition, predation, parasitism, mutualism, commensalism).
Predict the outcome of each community interaction
Give examples of types of defense mechanisms against predation
What is the difference between Mullerian and Batesian mimicry?
Describe the competitive exclusion principle and resource partitioning
Give examples of symbiotic relationships between species
Describe biodiversity and distinguish between species richness, relative species abundance, and species diversity
Describe the importance of foundation species and keystone species in communities
Describe community structure and succession

Parasites have interesting life histories. Watch the video below to learn more.

How parasites change their host's behavior

Watch the video below. Consider the community interaction you observe. Describe it as Competition, Predation, Parasitism, Mutualism, or Commensalism and explain why that description matches what you observed in the video.

You'd Never Guess What an Acorn Woodpecker Eats | Deep Look

Review biodiversity by watching the video below.

Why is biodiversity so important? - Kim Preshoff

20.1 Energy Flow through Ecosystems

Differentiate between food chains and food webs
Be able to trace the pathway of nutrients and energy as they pass through the various tropic levels of food chains and food webs
Describe how organisms acquire energy
Explain how the efficiency of energy transfers between trophic levels affects ecosystems (10% Rule)

20.1 Energy Flow through Ecosystems

Watch the video below. Draw a food chain to model the feeding relationships you observe in the video. Consider the importance of decomposers and detritivores.

There's Something Very Fishy About These Trees ... | Deep Look

Vocabulary:

Chapter 19.4-20.1 Key Terms

Textbook Questions:

Chapter 19

Review questions (15, 16)

Critical thinking questions (22, 23)

*Textbook answer key

Learning Activities:

Watch the amoeba sisters video to review food chains, food webs, trophic levels, and ecological pyramids:

Food Webs and Energy Pyramids

Complete the investigation below:

Investigation: Food web, keystone species, & trophic cascade

After completing the investigation, review the answer key and make corrections to your work if needed.

Investigation Food web, keystone species, & trophic cascade (answer key)