Question 1 an 3 are done. Just need clear explanation for the question #4. Is Th

Question

Question 1 an 3 are done. Just need clear explanation for the question #4.

Is There a Trade-Off between Current and Delayed Reproduction in the Collared Flycatcher? ANALYZING DATA 7.1 Lars Gustafsson and Tomas Pärt (1990)* studied a popu lation of collared flycatchers (Ficedula albicollis) on the Swedish island of Gotland. Gustafsson and Pärt monitored the survival and reproduction of each bird throughout its entire life. They noted that 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 are reported in the table 1. Graphthe average number ofeggs (on the y axis) versus age (on the x axis) for both early breeders and late breeders. 2. Do the results suggest that it would be advantageous for birds to delay reproduction until they were 2 years old? Explain. 3. Do the results indicate that allocating resources to cur- rent reproduction can reduce an individual's potential for future reproduction? Explain. 4. These results were based on field observations. What are the limitations of such data? Propose an experiment to test whether there is a cost of reproduction in females that reduces their potential for future reproduction. AVERAGE NUMBER OF EGGS AGE (YEARS) EARLY BREEDERSLATE BREEDERS 5.8 6.0 6.1 5.7 Gustafsson, L.and T. Pärt. 1990. Acceleration of senescence in the collared flycatcher Ficedula albicollis by reproductive costs. Nature 347:279-281 2 6.3 7.0 6.6 See the companion website for a similar ANALYZING DATA exercise. 4

Explanation / Answer

Answer 4:

The most important constraints of field data is you can not generalize this data. It is also very difficult to deal with large number of animals in the field. There is risk of injuries. So the assessment becomes difficult. Lot of cofactor needs to be considered while statistically analyzing the data.

--------------------------------------------------------

Cost of reproduction is a central concept of evolutionary biology which states increased investment in current reproduction and gives I'll effects in the next generation.

Temporal suppression of immune system could be tested in birds. If incubation demand of two breeding seasons in females common eiders by creating clutches of three to six eggs. The common eider is long lived sea duck where females do not eat during the incubation. Mass loss increased and immune response was reduced in females incubating large clutches.

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.