Population Dynamics

Multiple Choice

REVIEW: What are BIOTIC factors?

• Nonliving Factors

• Living Factors

• A group of species living in the same area at the same time

• Factors that are living and nonliving

Open Ended

What are 2 biotic factors and 2 abiotic factors in the picture?

Open Ended

If the following dispersion patterns is present in a population, what can you tell about the population overall and their available resources?

Multiple Choice

Which of the following is not a type of dispersion?

• Uniform

• Stratified

• Clumoed

• Random

Multiple Choice

You drive through Iowa in the spring and notice that along a stretch of several kilometers, every third fence post has a male redwing blackbird perched on it defending its nesting territory. This is an example of:

• Clumped Dispersion

• Random Dispersion

• Uniform Dispersion

• Artifical Dispersion

Multiple Choice

What type of limiting factor is present if a disease outbreak occurs because populations got too big, and causes half the population to decline?

• Density Dependent Limiting Factor

• Density Independent Limiting Factor

Multiple Choice

Which factor is density dependent?

• Climate

• Weather

• Rising Sea Level

• Food Competition

Multiple Choice

Which of the following is most clearly a case of density-dependent population regulation?

• the summer drying of savanna grass for an insect that feeds on grass sap

• a dangerous new flu strain that is transmitted among humans by sneezing

• the first hard frost of fall for a population of annual morning glory vines

• the occurrence of rainstorms for an opportunistic desert annual

Open Ended

An ecosystem has enough food to feed 100 bunnies (its carrying capacity is only 100 bunnies). The bunnies reproduce and there are now 200 bunnies. What will happen to this population?

Population Dynamics and Human Impact

Module 10 | Ecology

​"The Cats of Borneo"

​Watch the video. Answer the required question.

Open Ended

Explain how this video demonstrates the following statement: "All life is connected." Use evidence from the video to support your answer.

​Human Impact: Population

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​Human Impact: Populations

​As the human population grows, resources become scarce (food, water, and territory).

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​The change in the population's size per unit of time is known as the population growth rate. It depends on how many organisms are entering and exiting the population.

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​Human Impact: Populations

​Increasing populations (Congo) = more births than deaths​

​Decreasing (Germany) = more deaths than births

​Human Impact: Populations

Population can be exponential ("J Curve")

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​Population increases faster as time progresses.

​Human Impact: Populations

Population can be logistic ("S Curve")

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​Population is limited in resources and starts to decrease in size.

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​Maximum number of organisms in a population that the environment can support = carrying capacity

​Human Impact: Populations

​Resources such as food, water,and territory will limit the population size.

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​Some resources are density-dependent (depends on the number of organisms in the population). For example, food, water, disease, etc

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​Other resources are density-independent (does not depend on the number of organisms) For example, weather disasters, temperature, etc

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​Predator-prey relationships also maintain the population.

Human Impact: Environment​

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​Human Impact: Environment

​Human activities can impact our natural environments, for good or for bad.

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​For example, humans burning fossil fuels creates an increase of carbon dioxide within the atmosphere. This increase of carbon dioxide leads to global climate change ("global warming").

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​The use of fossil fuels (oil, coal, and natural gas) helps lead to the greenhouse effect. Methane also contributes to the greenhouse effect.

​Human Impact: Environment

​Human Impact: Environment

​Humans also lead to an increase of waste production and the consumption of resources.

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​Humans also lead to habitat destruction which reduces biodiversity.

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​Habitat destruction can be caused by: deforestation (increases runoff and soil erosion), increase of pesticide and fertilizers (creates algal blooms), acid rain (release of sulfates), farming practices, release of toxins in the environment, use of CFCs (destroying of ozone layer), and introduction of invasive species (upsets the ecosystem)

​Human Impact: Environment

​Humans must take action to maintain stability within our ecosystems.

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​These actions include "Reduce, Reuse, and Recycle" and using better farming/agriculture practices.