Ecological Interactions and Community Dynamics in Ecosystems

The video explores community ecology, focusing on interactions between species, such as mutualism, predation, and competition. It explains mutualism's two forms: obligate and facultative, with examples like the oxpecker and zebra. Predation and competition are discussed, highlighting their roles in population dynamics and ecosystem balance. The video also covers how food availability and predator-prey relationships influence population size and natural selection.

What is the primary focus of community ecologists?

• The study of individual organisms

• The interactions between populations of different species

• The genetic makeup of a single species

• The migration patterns of animals

Which of the following is an example of obligate mutualism?

• Oxpecker and zebra

• Yucca plant and moth

• Honeybees and plants

• Lions and hyenas

How does facultative mutualism differ from obligate mutualism?

• Facultative mutualism involves species that are entirely dependent on each other.

• Facultative mutualism involves species that can survive independently.

• Facultative mutualism is a type of predation.

• Facultative mutualism occurs only in aquatic environments.

What is the main difference between predation and competition?

• Predation is a symbiotic relationship, while competition is not.

• Predation only occurs in aquatic environments.

• Predation occurs horizontally, while competition occurs vertically.

• Predation involves one species consuming another, while competition involves species vying for the same resources.

Which of the following is a positive effect of predation on communities?

• Eliminating all prey species

• Decreasing species diversity

• Increasing the number of dominant species

• Reducing pressure on foundation species

What can act as a bottom-up control in an ecosystem?

• Predator population size

• Availability of food

• Climate change

• Human intervention

How does a top-down control affect prey populations?

• It has no effect on prey populations.

• It decreases the prey population size.

• It increases the prey population size.

• It only affects predator populations.

What happens to predator populations when prey is abundant?

• Predator populations become extinct.

• Predator populations increase.

• Predator populations remain stable.

• Predator populations decrease.

How do predators drive natural selection?

• By reducing the genetic diversity of prey

• By increasing the prey population

• By developing traits to capture prey

• By eliminating all prey species

What is the result of prey evolution driven by predation?

• Stability in prey population size

• Elimination of predator species

• Decreased prey population size

• Increased likelihood of prey survival