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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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The Selection Mosaic and Diversifying Coevolution between Crossbills and Lodgepole Pine.

Craig W Benkman

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    Asymmetrical competition between red squirrels and crossbills shapes pine cone evolution. The dominant competitor influences the evolutionary trajectory, creating diverse selection landscapes and potential speciation.

    Keywords:
    Keywords: coevolutioncompetitiondivergent selectiongeographic mosaicpredator‐preyspeciation

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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Plant-Animal Interactions

    Background:

    • Seed predators exert selective pressures on plant evolution.
    • Asymmetrical competition between species can alter these selective pressures.
    • Lodgepole pine (Pinus contorta ssp. latifolia) interactions with seed predators are key to understanding coevolutionary dynamics.

    Purpose of the Study:

    • To investigate how asymmetrical competition between seed predators influences the evolutionary trajectory of lodgepole pine cones.
    • To determine the roles of red squirrels (Tamiasciurus hudsonicus) and red crossbills (Loxia curvirostra) in driving pine evolution.
    • To explore the consequences of these interactions for biodiversity and speciation.

    Main Methods:

    • Comparative analysis of pine populations with varying predator abundances.
    • Ecological modeling of competitive interactions and selective pressures.
    • Phylogenetic analysis to infer coevolutionary histories.

    Main Results:

    • Red squirrels (Tamiasciurus hudsonicus) are dominant competitors, driving pine cone evolution in their presence.
    • When squirrels are absent, red crossbills (Loxia curvirostra) become significant selective agents, leading to an evolutionary arms race.
    • These interactions create a selection mosaic with coevolutionary hot spots, where divergent selection can promote speciation in crossbills.

    Conclusions:

    • Asymmetrical competition is a critical factor structuring plant-animal coevolutionary dynamics.
    • Divergent selection, while driving adaptation and speciation, can also erode the geographic mosaic of coevolution.
    • Understanding these complex interactions is vital for predicting evolutionary trajectories and biodiversity patterns.