In male lazuli buntings (Passerina amoena), a bird species that is native to North America, the feather coloration of males ranges from dull brown to very bright blue. Interestingly, it is the dullest and brightest yearlings that are most successful in obtaining high quality territory in a habitat with limited nesting sites. Adult males seem to tolerate dull-colored yearlings, who are perceived as non-threatening, and also keep distance from brightly colored yearlings. Yearling males with intermediate plumage are attacked by adults and therefore fail to obtain territory and attract females.

Which graph best depicts the type of selection occurring in this bunting population?

Question

In male lazuli buntings (Passerina amoena), a bird species that is native to North America, the feather coloration of males ranges from dull brown to very bright blue. Interestingly, it is the dullest and brightest yearlings that are most successful in obtaining high quality territory in a habitat with limited nesting sites. Adult males seem to tolerate dull-colored yearlings, who are perceived as non-threatening, and also keep distance from brightly colored yearlings. Yearling males with intermediate plumage are attacked by adults and therefore fail to obtain territory and attract females.

Which graph best depicts the type of selection occurring in this bunting population?

BlackTom AI · Accepted Answer

To approach this question, I start by identifying the type of natural selection described. The data indicate that the dullest and brightest yearlings are most successful at obtaining high-quality territory, while intermediate plumage patterns are attacked by adults. Adults tolerate dull and bright yearlings, which are perceived as non-threatening, and avoid the mid-range yearlings. This pattern points to a diversification of the population into two favored extremes, with the intermediate phenotype being selected against. In evolutionary biology, that kind of pattern is characteristic of disruptive (diversifying) selection, not stabilizing or directional selection.

Option 1: "" (empty). Since there is no content here, there is nothing to evaluate about its depiction of selection. It conveys no information and cannot be the correct choice.

Option 2: "None of these graphs is correct." This option would be correct if none of the provided graphs accurately depict disruptive selection producing a bimodal distribution with two prominent extreme phenotypes after selection. Given the described scenario, the correct depiction would show two peaks at the dull and bright ends with a dip at the intermediate plumage, i.e., a bimodal outcome. If the other graphs fail to show this pattern, this option would be the appropriate choice.

Option 3: "" (empty). As with Option 1, there is no content to evaluate, so it cannot be the correct choice.

Option 4: "" (empty). Similarly, this option provides no information to judge, so it cannot be the correct choice.

In summary, the key reasoning hinges on recognizing disruptive selection as the mechanism and identifying whether any of the graphs illustrate a bimodal shift toward the two extreme phenotypes. If none of the graphs depict that bimodal outcome, then the statement that none of the graphs is correct is the accurate one.

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