Commensalism and Keystone Species Concepts

The video tutorial discusses species interactions, focusing on symbiosis, which includes commensalism, parasitism, and mutualism. Examples are provided for each type: fish benefiting from sharks, ticks as parasites, and the mutualistic relationship between anemones and clownfish. The concept of keystone species is also introduced, highlighting the sea otter's role in its ecosystem. The video concludes with a call to action for viewers to subscribe.

What is the key requirement for a relationship to be considered symbiotic?

• It must involve two different species.

• It must involve organisms that are always harmed.

• It must involve two organisms of the same species.

• It must involve organisms that do not rely on each other.

In a commensal relationship, how is one organism typically affected?

• It is harmed.

• It is unaffected.

• It benefits.

• It is destroyed.

Which of the following is an example of a commensal relationship?

• A tapeworm in a host.

• Fish feeding on scraps from a shark.

• A clownfish and an anemone.

• A tick on a human.

What is a common characteristic of parasitic relationships?

• Both organisms are harmed.

• One organism benefits at the expense of the other.

• One organism is unaffected.

• Both organisms benefit.

Which of the following is NOT an example of parasitism?

• A clownfish living in an anemone.

• A mosquito feeding on blood.

• A tick on a human.

• A tongue-eating louse in a fish.

In mutualism, how do the organisms involved typically interact?

• Both benefit.

• Both are unaffected.

• One benefits, the other is harmed.

• One benefits, the other is unaffected.

What is a well-known example of mutualism?

• A tapeworm in a host.

• Fish feeding on shark scraps.

• A clownfish and an anemone.

• A tick on a human.

What role does a keystone species play in an ecosystem?

• It has no significant impact.

• It exerts a strong control on the ecosystem's structure.

• It is always the top predator.

• It only affects abiotic factors.

Which species is considered a keystone species in the kelp forest ecosystem?

• Clownfish

• Ticks

• Sea otters

• Sharks

What happens to an ecosystem if a keystone species is removed?

• Nothing changes.

• Only the keystone species is affected.

• The entire ecosystem structure can change dramatically.

• Only abiotic factors are affected.