A What species was most likely to be pollinating the iris? Relative to the other

Question

A

What species was most likely to be pollinating the iris?

Relative to the other species, does this species have a long, a short, or an intermediate-length tongue?

B

What type of distribution of flower-tube lengths do these plants have?

What is the mean flower-tube length in this population?

Is the mean flower-tube length of the flowers longer or shorter than the mean tongue length of the most prevalent pollinator?

C

What is the relationship between flower-tube length and setting fruit?

D

What is the relationship between flower-tube length and the number of seeds produced?

Assuming the seed production and fruit set are closely associated with fitness, what do the data suggest about selective pressures on flower-tube lengths?

If the variation in flower-tube length in this population were due solely to environmental factors, what would be the expected change in flower-tube length over several generations?

What possible experiments can be done to examine whether Agrius convolvuii is the selective agent acting on the length of flower in G. longicollis?

Hawkmoth species Mean tongue length Individuals carrying Gladiolus pollen (%) t s.d. (mm) Agrius convolvuli Basiotha schenki Hippotion celerio Nephele sp Theretra cajus Theretra capensis 102.9 6.7 39.5 +2.9 36.8 +1.7a 37.0 + 3.0 27.0 +2.6 35.0 80 15 50 0 0 Table 1 Species of hawkmoths caught in the area, length of tongue, and proportion of individuals carrying pollen from Gladiolus longicollis

Explanation / Answer

(According to chegg policy, answering the first four questions.)

A. (1) The speciesmost likely to be pollinating is Agrius convolvuli as 80 percent of the caught sample showed pollen on their toungue.

(2) This species have the longest mean tongue length among all.

B. (1) From the graph shown, the flower tube length is seen to follow a normal distribution.

(2) From the graph the mean tube length is approximately 92 mm.

(3) It can be seen that the mean flower length is a bit shorter than the mean tongue length of the most prevalent pollinator. This might also explain why the species with shorter tongue length are not as good pollinators as Agrius convolvuli.

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