Brown trout have disappeared from a popular fishing pond in the Sierra Nevada mountains. Use the graphs to answer the following questions. a. The data in the graphs provide evidence for which conclusion?

• As the water in the pond cooled, the brown trout died

• Brown trout can’t survive in water over 25ºC.

• All the  sh were gone by 1995

• Brown trout prefer cooler water

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Why do you need both graphs to determine how water temperature a ects the brown trout population?

• Abiotic factors (like water temperature) are the main cause for changes to brown trout populations.

• You need two graphs in order to explain what happens to the brown trout population over time.

• Patterns in the two types of data can show relationships between the temperature and the brown trout population.

• Without the brown trout population graph, you would not know what the water temperature was in a given year.

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2. Consider the following data about feeding relationships of organisms living in Glacier National Park, Montana. a. Construct a simple food chain for ground squirrels, coyotes, and grass.

• Weasels---->Grass---->Mice

• Grass------> Ground Squirrel------> Coyote

• Coyote-----> Mice-----> grass

• Mice----> Grass----> Coyote

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Which distribution of populations will create a more stable ecosystem?

• Equal numbers of organisms

• More coyotes and less weasels

• A small number of coyotes and a lot of grass

• A small amount of grass, some squirrels, and a lot of weasels

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How does the 10% rule help explain which distribution of populations will create a more stable ecosystem?

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Why are bacteria important in an ecosystem?

• They break down dead organisms into sugar.

• They convert biomass into nutrients

• They convert biomass into energy for producers

• They change dead organisms into usable energy

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What would be the mostly likely effect to another population if a disease killed the entire lizard population?

• The ant population would increase.

• The hawk population would decrease

• The grass population would increase.

• The gopher population would increase

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Ecosystem services are bene ts that humans receive from the ecosystems on Earth. Ecosystem services include provisioning, regulating, cultural, and supporting services. Put a check next to each example of an ecosystem service

• Walking through an urban forest can help reduce stress and make people feel happier

• Runoff from farms adds nutrients to coastal waters around coral reefs.

• Trees convert carbon dioxide into biomass through photosynthesis

• Heavy snowfall in the mountains provides fresh water for plants in the spring

• Climate change causes increased wild res and stronger storms

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Ecosystems can better recover from stresses on the ecosystem if _____.

• there are fewer predators to eat primary and secondary consumers

• there are more primary consumers than secondary consumers

• there are fewer species, but larger populations of each species

• there are large populations of many species

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Tarantulas live in the Sonoran Desert ecosystem. These large spiders rest in their underground burrows all day. At night, they come out to look for food, water, and a mate. When day approaches, the tarantulas return to their burrows. Based on this information, put a check next to each factor that is likely to affect tarantula behavior;

• Light

• Temperature

• Competition

• Cloud cover

• Food availability

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