Ecosystem Management and Fire Impact

The video explores ecosystems, focusing on both abiotic and biotic impacts. It defines ecosystems as communities of organisms interacting with their environment and discusses sustainable ecosystems that maintain balance over time. Abiotic impacts like floods and fires are examined, along with human management strategies. The video also covers biotic impacts, particularly the introduction of species like cane toads, which have disrupted ecosystems. The cane toad case highlights unintended consequences of human intervention.

What is a key characteristic of a sustainable ecosystem?

• It has a high number of predators.

• It can provide for all organisms over a long period.

• It is isolated from other ecosystems.

• It has no abiotic factors.

Which of the following is an abiotic factor that can impact ecosystems?

• Introduction of a new predator

• Drought

• Competition for food

• Disease outbreak

What is a common cause of floods?

• Earthquakes

• Heavy rainfall

• Deforestation

• Volcanic eruptions

How do levees help in flood management?

• They prevent rain from falling.

• They absorb excess water.

• They increase water levels.

• They raise banks to improve drainage.

What is a natural cause of fires in ecosystems?

• Deforestation

• Overpopulation

• Lightning

• Human negligence

Why do some ecosystems require fire?

• To reduce animal populations

• To increase carbon dioxide levels

• To help certain seeds germinate

• To clear land for agriculture

What is a method used to prevent fires?

• Planting more trees

• Building more roads

• Fuel reduction burning

• Increasing animal populations

What was the intended purpose of introducing cane toads to Australia?

• To control the gray-backed cane beetle population

• To control the population of native predators

• To serve as a food source for native animals

• To increase biodiversity

What was an unintended consequence of introducing cane toads?

• They improved the ecosystem balance.

• They multiplied rapidly and became toxic to native species.

• They helped control the beetle population.

• They became a food source for native species.

What is a biotic impact on ecosystems?

• Flooding

• Introduction of non-native species

• Drought

• Cyclones