Lake Winnipeg is a shallow lake composed of two basins: a wide north basin and a narrow south basin that provides

Lake Winnipeg is a shallow lake composed of two basins: a wide north basin and a narrow south
basin that provides a habitat for over 50 different species of fish. Each of the statements below
involves a situation that will affect the growth of a population. Classify each of the statements as
DD (density dependent) or DI (density independent) and give a reason for your choice.
1. Rainbow smelt and yellow perch attempt to occupy the same area. The more aggressive smelt
survive; the perch do not.
2. A severe flood brings a lot of sediment and silt into Lake Winnipeg. The turbidity of the lake
increases greatly
3. Since northern pike prey on yellow perch, an increase in the perch population causes an
increase in the pike population.
4. Many fish die due to an increase in water temperature.
5. Due to over-fishing, the number of walleye in Lake Winnipeg decreases.
6. A population is growing quickly when parasites cause disease to spread quickly.
7. Lake sturgeon migrate long distances to spawn and many do not survive the trip.
Y


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