Koala and Bear Dietary Adaptations

Mr. Bernard explains ecological tolerance, focusing on the range of abiotic factors affecting species survival. He discusses the differences between specialists and generalists, using bears as examples. Polar bears are specialized for hunting on sea ice, while grizzly bears are more adaptable. The koala bear is highlighted as a specialist dependent on eucalyptus leaves. The video concludes with a summary of the adaptability of generalists versus the challenges faced by specialists.

What does ecological tolerance refer to?

• The range of predators a species can withstand

• The range of food sources available to species

• The range of living factors affecting species survival

• The range of non-living factors affecting species survival

Which zone on the bell curve represents the best survival conditions for a species?

• Zone of adaptation

• Optimal tolerance zone

• Zone of stress

• Zone of intolerance

What is a species with a narrow range of tolerance called?

• Generalist

• Predator

• Specialist

• Omnivore

How do food sources relate to abiotic factors?

• Food sources are not influenced by environmental conditions

• Food sources are directly dependent on abiotic factors

• Food sources are independent of abiotic factors

• Food sources are only affected by biotic factors

Which bear is known for its dependence on sea ice for hunting?

• Koala bear

• Polar bear

• Kodiak bear

• Grizzly bear

What is the primary diet of Kodiak bears?

• Seals

• Berries and grasses

• Eucalyptus leaves

• Sea ice

What challenge do polar bears face as sea ice melts?

• Lack of food sources

• Increased competition with grizzly bears

• Inability to adapt to warmer temperatures

• Loss of habitat

What is unique about the koala bear's diet?

• It is an omnivore

• It only eats eucalyptus leaves

• It eats a variety of plants

• It is a carnivore

Why are eucalyptus leaves challenging for koalas to digest?

• They are too fibrous

• They are low in nutrients

• They are toxic

• They are high in sugar

What is a key difference between generalists and specialists?

• Generalists have a wide tolerance range

• Specialists can survive in any environment

• Specialists are more adaptable to new conditions

• Generalists have a narrow tolerance range