Unit 7 Exam Review
Supplemental Instruction
Iowa State University / Leader: / Maura
Course: / Bio 211
Instructor: / Colbert
Date: / 12/8/16

POPULATION ECOLOGY CONT’D

1.Why is population density so important? What happens if an area is too dense or not dense enough?

2.Explain why clumped dispersion shows there is positive interactions in a population

3.Explain why uniform dispersion shows there is negative interactions in a population

4.True or False:

The decrease in the population of one species does not affect the success/depletion of another species.

5.What are two causes (for each) of how additions and deletions occur to change a population?

6.When describing population change what equation do you use? Explain what each variable stands for

7.What is r and what does it effect and how?

8.What two instances does the exponential growth model represent? Draw what this model looks like and what occurs with varying effects of growth rates

9.Circle the correct answer: Logistic Growth Model/Exponential Growth Model assumes there is unlimited resources. Would this happen in the real world? Why or why not

10.Carrying capacity is symbolized by the letter ____?

11.How does the logistic growth model differ from the exponential growth model? What is the shape of the logistics growth model, why?

12.What does Colbert mean when he says there a density dependent and density independent factors that affect mortality rate? Provide a few examples of each.

13.True or False and correct if false: Extinction is natural and humans majorly contribute to the natural extinction of species.

14.How would one species drive another species to extinction

COMMUNITY ECOLOGY

1.How does community ecology differ from population ecology?

2.Fill out the chart below:

Four types of species to species interactions / Definition / Example

3.There are many forms of mimicry, provide an example of one and why an organism would choose to mimic another organism.

4.Name and describe the three subcategories of the species to species interaction of consumption. What is consumption?

5.The ______states that two species cannot occupy the exact same niche.

6.Which of the following is true about community structure:

  1. The diversity and abundance of species depends on historical features, biotic factors, morphology and topography
  2. The diversity and abundances of species depends on interactions with other species, precipitation, historical features and topography
  3. The diversity and abundance of species depends on Biotic factors and Abiotic factors
  4. The diversity and abundance of species depends on Biotic factors, Abiotic factors, Historical features, Morphology and the landscape of the habitat

7.True or False:

Two species in a community have the same requirements, that is why they live in the same area. Therefore they occupy the same niche.

8.What is a niche?

9.Describe the difference between the two types of niches

10.How can there be so many species in a niche?

11.Analyzing the information below what is the best niche for the species Chthamalus. Use the two types of niches to explain each environment relative to each species(lower intertidal zone and upper intertidal zone).

12.Is it possible for some animal species to have shared resources? If so, what are some examples.

13.What concept does the picture below represent? Why do you say this?

**Be sure to also go over ecosystem ecology