Ecosystem Dynamics and Population Factors

Lisa D discusses the concept of ecosystems, explaining the different levels such as organisms, populations, and communities. She elaborates on the components of ecosystems, including biotic and abiotic factors, and provides examples of each. The video also covers the idea of competition for resources and the concept of carrying capacity, explaining why certain species, like cougars, are not more prevalent in certain areas. The lesson concludes with a summary of these ecological principles.

Why aren't cougars taking over the highways and swarming the Alamo?

• Because they are afraid of humans.

• Because they are nocturnal animals.

• Because they have enough food and space.

• Because they are not the top predator.

What is a population in an ecosystem?

• A collection of various communities.

• A single organism living alone.

• A group of different species living together.

• A group of individuals of the same species living in the same area.

What is the next level above population in an ecosystem?

• Community

• Organism

• Biosphere

• Ecosystem

What does an ecosystem consist of?

• Only living communities.

• Only non-living factors.

• Both living communities and non-living factors.

• Only plants and animals.

Which of the following is a biotic factor?

• Wind

• Plants

• Soil type

• Temperature

Which of the following is an abiotic factor?

• Rainfall

• Insects

• Fungi

• Animals

What is competition in an ecosystem?

• When plants grow in the same area.

• When individuals or populations struggle for the same resources.

• When organisms share resources equally.

• When predators hunt prey.

What is carrying capacity?

• The total number of abiotic factors in an ecosystem.

• The minimum number of individuals needed for a population.

• The average number of organisms in a community.

• The maximum number of species an ecosystem can support.

Why can't our area support more cougars?

• Because the climate is not suitable.

• Because there is too much competition from other species.

• Because the carrying capacity has been reached.

• Because there are too many predators.

What limits the number of cougars in an ecosystem?

• Only abiotic factors.

• Both biotic and abiotic factors.

• Neither biotic nor abiotic factors.

• Only biotic factors.