Human Impact on Ecosystems

What does aquatic vegetation (plants) provide to water habitats (lakes, bays, rivers)?

• decomposers

• carbon dioxide

• dissolved oxygen

• toxins

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If toxic chemicals spill into an estuary and kills the aquatic grasses, what immediate consequence is likely to occur?

• water fowl will leave

• decrease in photosynthesis and therefore dissolved oxygen

• more producers can take their place

• less sunlight can reach plants on the bottom

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Algal blooms may occur if excess nitrogen enters a waterway from polluted runoff. When the blooms die and decompose, oxygen in the water is depleted. Which of the following is likely to occur?

• more fish reproduce

• new invertebrates invade the ecosystem

• fish populations begin to die

• water becomes less turbid

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If nitrogen-rich fertilizers run off of the land and into a waterway, what species is likely to benefit and begin over-growing?

• oysters

• chickens

• fish

• algae

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The image shows plant life growing along the edge of a stream (riparian buffer). Place a check next to the statements that describe benefits of this best management practice?

• reducing sediment runoff into the stream

• allowed storm water run off to be filtered before entering the stream

• stabilizes the banks of the stream to slow erosion

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Recycling is provided by most cities. What is the benefit of recycling products?

• reduces the amount of garbage in landfills

• increases the amount of oxygen in the bay

• slows or dependency on fossil fuels

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If habitat destruction takes place and a population once found there is now considered "extinct", what is the likely cause of this disappearance?

• they are no longer able to produce offspring

• there is not enough biodiversity

• they are not able to evolve fast enough

• invasive species take over

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If a study shows that there has been a decrease in a certain species of sea turtle in an area that is heavily fished by many commercial industries, what is the likely reason?

• many are dying due to being caught as "bycatch" and die in the nets

• they are being mistake as fish

• sharks are attracted by the fishing and eat the turtles

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What is the likely reason for wetland loss in the southeastern US?

• better farming practices

• increasing protection through state regulations

• increasing human population

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What is one of the most important functions of wetlands?

• many commercial fisheries use them to capture bait

• they act as natural water purifiers, filtering sediment and absorbing pollutants

• Canadian geese now live there

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