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
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
_____________________________________________________________________
7. Lake sturgeon migrate long distances to spawn and many do not survive the trip.
_____________________________________________________________________
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