Question

BIOESS148 Homework #2, 50 pts total 4. Is There a Trade-Off between Current and Delayed Reproduction in the Collared Flycatcher? (10 pts) Suppose that you were studying a different population of collared flycatchers (Ficedula albicollis) and that you monitored the survival and reproduction of each bird throughout its entire life. Some females reproduced for the first time when they were 1 year old ("early breeders"), while others reproduced for the first time when they were 2 years old ("late breeders"). The average number of eggs laid by early breeders and late breeders of a given age are reported in the table. Average number of eggs Early Late breeders breeders Age (years) 4.1 5.1 7.5 > 7.1 4.5 6.9 Question 4a. Graph the average number of eggs (on the y axis) versus age (on the x axis) for both early breeders and late breeders. (4 rts) Question 4b. Do the results suggest that it would be advantageous for birds to delay reproduction until they were 2 years old? Explain. (6 pts)

Answer 1

Answer:

4)a):

average nuber of eggs vs age average no of eggs ONU 00 4 age early breeders late breeders

4)b):

• Yes the graph represents that it would be advantageous to delay reproduction since the average repreoducing rate in case of delay is much more than in the case of other.
• average in case of early breeders is 4.7 after 2 yrs of age while in the other case, average is 7.16 thus, wait till 2 yrs of age is productive.

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