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Evolutionary Determinants of Morphological Polymorphism in Colonial Animals.

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    Polymorphism in colonial animals like bryozoans evolves with ecological succession, not environmental stability. Competitively dominant species with more specialized modules outcompete others, driving the macroevolution of polymorphism.

    Keywords:
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    Area of Science:

    • Evolutionary Biology
    • Marine Biology
    • Zoology

    Background:

    • Colonial animals exhibit diverse polymorphic modules for specialized functions, but the evolutionary drivers remain unclear.
    • Polymorphism varies greatly across colonial invertebrates, from none to extreme complexity.
    • Previous hypotheses linked polymorphism to environmental stability, suggesting it's costly due to loss of feeding/sexual function.

    Purpose of the Study:

    • To test the environmental hypothesis for the evolution of polymorphism in colonial invertebrates.
    • To investigate the relationship between polymorphism, ecological succession, and life history variations.
    • To compare bryozoan faunas across oceanographically distinct regions.

    Main Methods:

    • Compared bryozoan polymorphism incidence in the Eastern Pacific and Caribbean.
    • Examined correlations between polymorphism degree, ecological succession patterns, and life histories.
    • Utilized bryozoans from opposite shores of the Isthmus of Panama.

    Main Results:

    • Found no support for the environmental hypothesis; polymorphism incidence was similar in stable and unstable environments.
    • Discovered a strong correlation between a species' position in ecological succession and its degree of polymorphism.
    • Observed that competitively dominant species with higher polymorphism levels replace less polymorphic species.

    Conclusions:

    • Ecological succession, not environmental stability, is a key factor in the macroevolution of animal polymorphism.
    • Increased polymorphism is associated with competitive dominance and life history strategies.
    • Bryozoans provide a unique model system for studying the macroevolution of polymorphism.