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Eco-evolutionary significance of “loners”

Author(s): Rossine, Fernando W; Martinez-Garcia, Ricardo; Sgro, Allyson E; Gregor, Thomas; Tarnita, Corina E

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Abstract: Loners—individuals out of sync with a coordinated majority—occur frequently in nature. Are loners incidental byproducts of large-scale coordination attempts, or are they part of a mosaic of life-history strategies? Here, we provide empirical evidence of naturally occurring heritable variation in loner behavior in the model social amoeba Dictyostelium discoideum. We propose that Dictyostelium loners—cells that do not join the multicellular life stage— arise from a dynamic population-partitioning process, the result of each cell making a sto- chastic, signal-based decision. We find evidence that this imperfectly synchronized multicel- lular development is affected by both abiotic (environmental porosity) and biotic (signaling) factors. Finally, we predict theoretically that when a pair of strains differing in their partition- ing behavior coaggregate, cross-signaling impacts slime-mold diversity across spatiotem- poral scales. Our findings suggest that loners could be critical to understanding collective and social behaviors, multicellular development, and ecological dynamics in D. discoideum. More broadly, across taxa, imperfect coordination of collective behaviors might be adaptive by enabling diversification of life-history strategies.
Publication Date: 19-Mar-2020
Electronic Publication Date: 19-Mar-2020
Citation: Rossine, Fernando W, Martinez-Garcia, Ricardo, Sgro, Allyson E, Gregor, Thomas, Tarnita, Corina E. (Eco-evolutionary significance of “loners”. PLOS Biology, 18 (3), e3000642 - e3000642. doi:10.1371/journal.pbio.3000642
DOI: doi:10.1371/journal.pbio.3000642
EISSN: 1545-7885
Pages: e3000642 - e3000642
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: PLOS Biology
Version: Final published version. This is an open access article.

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