Homeostasis Midpoint Review

Homeostasis Midpoint Review

Biology

ELO5: Analyze how changes to an ecosystem impact the complex interactions of populations (SEP4)

Maximum population size that can be sustained in an ecosystem (determined by biotic & abiotic factors)

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What are examples of biotic and abiotic factors that would affect carrying capacity?

Open Ended

What are examples of biotic and abiotic factors that would affect carrying capacity?

What is the carrying capacity of these populations??

Both kelp and sea otter populations are decreasing over time? Why?

Multiple Choice

Why are kelp and otter populations decreasing?

• Otters decrease due to not enough food & kelp decreases because of lack of sunlight

• Orcas are hunting too many otters which increases urchin populations to eat too much kelp

• Otters increase and eat too many urchins & kelp population decreases due to urchins eating

• Orcas don't eat otters & urchins are eating too much kelp

Why are kelp & otter populations decreasing?

​Humans are over hunting whales which makes orcas eat otters.

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​Otters populations are decreasing due to the orcas.

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​Urchin populations increase and over eat kelp which decreases kelp population?

Multiple Choice

What are keystone species?

• Removal of species deeply impacts whole ecosystem

• Species needed for ecosystem to be in homeostasis

• Species that doesn't impact homeostasis

• Both Blue and Teal boxes are correct

​What is homeostasis?

​Stable equilibrium or maintained balance

​Ocean Acidification

​How does CO2 levels impact urchin shells?

Open Ended

How does increased CO2 levels in the ocean result in weaker urchin shells?

​​How does CO2 levels impact urchin shells?

​1) CO2 reacts with water to make carbonic acid.

​2) Acid in the water has more H+ ions which lowers the pH.

​3) Ca+ ions want to bond with carbonate but the excess H+ ion bond with the carbonate instead.

​4) There is not enough CaCO3 to build shells resulting in weaker shells because H+ bonded with CO3