Biodiversity and Keystone Species

Where are many critical biodiversity hotspots located?

• cities and developed areas of the world

• islands, tropical rain forests, and coastal areas

• desert and polar environments

• all of these

What human activities have influenced recent extinction events?

• habitat destruction

• poaching

• introducing exotic species

• all of these

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How many species are estimated to be living on Earth?

• between 10,000 and 1,000,000

• between 500,000 and 1 million

• between 1 and 5 million

• between 10 and 50 million

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A species that has a disproportionately large effect on community structure relative to their abundance.

• Pioneer Species

• Invasive Species

• Keystone Species

• Foundation Species

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Match the following

• a state of balance between continuing processes

• Complexity

• the variety of organisms in an area, by species, genes, populations, and communities

• Biomass

• the state or quality of being intricate or complicated

• Biodiversity

• All the populations of all the different species that live together in a particular area

• Dynamic Equilibrium

• the total amount of living tissue in a trophic level.

• Species richness

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T or F: Succession increases biodiversity.

• true

• false

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Maintaining ________ is important to keep an ecosystem healthy.

• pollutants

• biodiversity

• sunlight

• interactions

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What is a keystone species?

• A species that is the most abundant in an ecosystem

• A species that has a disproportionately large effect on its environment relative to its abundance

• A species that is the largest predator in an ecosystem

• A species that is the primary producer in an ecosystem

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Which of the following is an example of a keystone species?

• Elephant in African savannas

• Kelp in marine ecosystems

• Sea otter in kelp forests

• All of the above

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How does biodiversity contribute to ecosystem stability?

• By increasing the number of predators

• By providing a variety of genetic resources

• By reducing the number of species

• By increasing competition among species

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