Scales of Ecology Part 2: Communities

The video explores community ecology, focusing on interactions like mutualism, predation, and competition. It explains mutualism types, such as obligate and facultative, with examples like oxpeckers and zebras. Predation and competition are discussed, highlighting their roles in ecosystems. The video also covers population dynamics, showing how predation and resource availability influence population sizes and community balance.

What is the primary focus of community ecologists?

• The genetic makeup of species

• Interactions between populations of different species

• The study of individual organisms

• The migration patterns of animals

Which of the following is an example of obligate mutualism?

• Oxpecker and zebra

• Honey bees and plants

• Yucca plant and moth

• Wolves and moose

How does predation differ from competition?

• Predation occurs horizontally, competition vertically

• Predation involves resource sharing, competition involves resource consumption

• Predation is a symbiotic relationship, competition is not

• Predation occurs vertically, competition horizontally

What role do predators play in increasing community diversity?

• They eliminate all prey species

• They hunt dominant species, reducing pressure on foundation species

• They provide food for all species

• They increase the population of dominant species

What is a bottom-up control in population dynamics?

• Natural disasters

• Predators controlling prey populations

• Availability of food resources

• Competition for territory

How do predators drive natural selection?

• By adopting strategies that force prey to evolve

• By eliminating all prey species

• By providing food for prey

• By increasing the carrying capacity of the environment

What happens to prey populations when predators are scarce?

• Prey populations become extinct

• Prey populations increase

• Prey populations remain stable

• Prey populations decrease