NAU Biology BIO 226
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BIO226 : Population : Life Histories and Evolution : Life History Variation

Exercise: Life History Variation
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DUE: 19-Feb-99. Work sent after this date will receive a grade of zero.
Life histories of different species reflect their adaptations to environment. From the Ducks of the World, make a table with the following information:

Common NameClutch SizeIncubation TimeAge at First
Reproduction
American Black  __________    __________    __________  
Laysan Teal  __________    __________    __________  
Mallard  __________    __________    __________  
Mandarin  __________    __________    __________  
Maned Goose  __________    __________    __________  
Wood Duck  __________    __________    __________  
Canvasback  __________    __________    __________  
Red-crested  __________    __________    __________  
Ring-billed  __________    __________    __________  
Rosy-billed  __________    __________    __________  

1. Enter the data into the text box below.

2. Which species would you expect to have the greatest reproduction potential? Explain.

3. What additional information do you need to determine the population growth rate of these species? Explain.

4. David Lack hypothesized that clutch size increased from the tropics to higher latitudes. Are these data on ducks consistent with this hypothesis? Explain.

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