Biotic Factors: How Living Things Affect Ecosystems and Communities

The video tutorial discusses biotic factors, which are living elements that affect ecosystems and communities. It explains how food availability, new predators, pathogens, and species competition can influence the makeup and size of communities. Examples include the impact of mink on UK ecosystems and the competition between red and gray squirrels. The tutorial concludes with an example of how introducing a new predator, like a mink, can alter a community's dynamics.

What is a biotic factor?

• A chemical factor affecting a community

• A living factor affecting a community

• A physical factor affecting a community

• A non-living factor affecting a community

How can the availability of food influence a community?

• It can increase the number of abiotic factors.

• It has no effect on the community.

• It can lead to a decrease in predator numbers.

• It can change the makeup and size of the community.

What impact did the introduction of mink have on UK ecosystems?

• They had no significant impact.

• They reduced competition among predators.

• They increased the number of red squirrels.

• They caused a decline in certain animal populations.

What is the effect of the varroa mite on bee populations?

• It benefits the bees by providing nutrients.

• It increases the number of bees.

• It has no effect on bee populations.

• It damages bee populations by spreading diseases.

How does the introduction of a new predator like mink affect existing predators such as owls?

• It increases competition for food.

• It reduces competition for food.

• It has no effect on existing predators.

• It leads to an increase in owl populations.