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Rainbow smelt and yellow perch attempt to occupy the same area. The more aggressive smelt survive; the perch do not.

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A severe flood brings a lot of sediment and silt into Lake Winnipeg. The turbidity of the lake increases greatly.

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A drought decreases the water level in Lake Winnipeg. The carrying capacity of the lake decreases.

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Due to the introduction of rainbow smelt, Lake Winnipeg becomes crowded and some fish species do not survive.

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Since northern pike prey on yellow perch, an increase in the perch population causes an increase in the pike population.

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Many fish die due to an increase in water temperature.

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Due to over-fishing, the number of walleye in Lake Winnipeg decreases.

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A population is growing quickly when parasites cause disease to spread quickly.

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