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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Plant Science

    Background:

    • Plant coloration is hypothesized to serve multiple ecological functions, but these are often studied in isolation.
    • Ecological pleiotropy, where a single trait influences multiple ecological interactions, may maintain color variation within species.
    • Anthocyanins, red plant pigments, are key to understanding plant-insect interactions and coloration.

    Purpose of the Study:

    • To investigate the adaptive value of red plant pigment (anthocyanin) in the carnivorous pitcher plant (Sarracenia purpurea).
    • To examine how anthocyanins mediate multiple plant-insect interactions, including prey capture, herbivore damage, and larval recruitment.
    • To test the hypothesis of ecological pleiotropy maintaining color polymorphism in Sarracenia purpurea.

    Main Methods:

    • Comparison of red and green color morphs of Sarracenia purpurea in natural sympatric populations.
    • Integration of field and laboratory bioassays, visual modeling, and chemical analysis of anthocyanins.
    • Long-term demographic study to assess recruitment and reproductive success.

    Main Results:

    • Each color morph exhibited differential performance in various ecological contexts, indicating opposing selection pressures.
    • Evidence suggests anthocyanins mediate multiple plant-insect interactions, with both benefits and costs associated with their production.
    • Stable color polymorphism and seed set data support the role of balancing selection in maintaining variation.

    Conclusions:

    • Ecological pleiotropy, driven by anthocyanin production, plays a significant role in maintaining intraspecific diversity in plant color.
    • Opposing ecological interactions exert selection on plant color, leading to the maintenance of variation.
    • This study demonstrates how a single pigment can influence multiple key plant-insect interactions, shaping plant evolution.