Can a keystone species become endangered?

In one line

The rule

A keystone species is a species that has a disproportionately large impact on its environment relative to its abundance. (NCERT, Class 11) An endangered species is a species that is at risk of extinction due to a rapid decrease in its population or habitat loss. (NCERT, Class 11)

Let's understand it simply

Imagine a cricket team where one player is the captain, the best batsman, and the best bowler. If this player gets injured, the whole team suffers. In nature, a keystone species is like that player—its role is so important that if it disappears, the whole ecosystem (the team) changes or even collapses. Now, just like any player can get injured, a keystone species can also face dangers. If too many are killed, their home is destroyed, or food runs out, their numbers can fall so low that they become endangered (at risk of disappearing forever).

How it works

1. A keystone species keeps the ecosystem balanced (like the sea otter eating sea urchins).
2. If humans hunt it, cut down forests, or pollute its home, its population drops.
3. With fewer keystone species, other species may increase or decrease too much.
4. The ecosystem becomes unbalanced and unhealthy.
5. If the keystone species' numbers get very low, it becomes endangered.

The story behind it

Scientists first noticed the idea of keystone species in the 1960s. Robert Paine, an American ecologist, saw that removing one type of starfish from a rocky shore caused many other species to disappear. This showed that some species, even if not many in number, are key to the whole system. Over time, people saw that these important species can also become endangered if not protected.

Where you see it in real life

• Tigers in Indian forests: Tigers control the number of deer and wild boar. If tigers become endangered, the forest balance is lost.
• Sea otters in kelp forests: Otters eat sea urchins. If otters are hunted and become endangered, urchins eat all the kelp, destroying the habitat.
• Elephants in grasslands: Elephants knock down trees and spread seeds. If elephants are poached and become endangered, the landscape changes.
• Honey bees in farms: Bees pollinate many crops. If bees become endangered due to pesticides, food crops suffer.

Why it matters

• Losing a keystone species can collapse an entire ecosystem, affecting many plants and animals.
• Protecting endangered keystone species helps save many other species at the same time.
• Conservation programs focus on these species to keep the environment healthy.
• Questions about keystone and endangered species come in board exams and are important for biology careers.

Common mistakes

• Thinking only rare species can be endangered. Even common keystone species can become endangered if threats are high.
• Believing all endangered species are keystone species. Some are, but not all.
• Forgetting that one species can be both keystone and endangered at the same time.

Remember it

If a keystone species is in danger, the whole ecosystem is in danger too.