Ecosystem Dynamics - Remote Learning Week 7

Coyote populations have been increasing in recent years. Which would not be a reason for their increase?

• More food is available

• Less competition from other predators

• Less available habitat to live in.

• Less threat of being hunted by humans

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According to the chart, which year had the smallest population of coyotes?

• 1990

• 2000

• 2007

• 2009

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If the trend from 1990 to 2010 were to continue, how many sightings would we expect in 2020?

• 20 or more

• between 10-15

• between 5-10

• less than 5

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If the populations of grasshoppers would decrease, what affect would that have on the population of lizards?

• Increase

• Stay the same

• Decrease

• Unable to determine

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If the population of rattlesnakes were to decrease, why would that help to increase the population of hawks?

• Rattlesnakes eat hawks

• Hawks eat rattlesnakes

• Rattlesnakes and hawks both eat kangaroo rats.

• It would not help the hawk population.

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What is a negative impact that the Asian Carp have on native species in our rivers

• They eat the same food as some native species

• They use the same space as native species

• They out-compete some native species

• All of these

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Rats were introduced to Australia and the rat population exploded over several years. Which would not be a reason for their population growing?

• Large amounts of available food

• Increase in the number of predators.

• More water available

• Large habitats to live in

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Which is an abiotic factor that influences the population of the rats?

• The amount of food available

• The amount of water available

• The number of predators available

• The amount of competition in the ecosystem

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Eventually the rat population in Australia reached its carrying capacity. What does that mean?

• The rat population continued to grow larger.

• The rat population reached its maximum level.

• The rat population went extinct.

• The rat population no longer was affected by limiting factors

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Which would be a limiting factor on the rats

• The availability of food.

• The number of predators

• The availability of abiotic resources

• All are limiting factors.

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