High relatedness in a social amoeba: the role of kin-discriminatory segregation.

Proceedings. Biological Sciences
Owen M GilbertDavid C Queller

Abstract

A major challenge for social theory is to explain the importance of kin discrimination for the evolution of altruism. One way to assess the importance of kin discrimination is to test its effects on increasing relatedness within groups. The social amoeba Dictyostelium discoideum aggregates to form a fruiting body composed of dead stalk and live spores. Previous studies of a natural population showed that where D. discoideum occurs in the soil, multiple clones are often found in the same small soil samples. However, actual fruiting bodies usually contain only one clone. We here performed experiments to gauge the effect of kin-discriminatory segregation on increasing relatedness. We mixed co-occurring clones from this population using a relatedness level found in small soil samples. We found a lower proportion of uniclonal fruiting bodies and a lower level of relatedness compared with natural fruiting bodies. We found that the amount of relatedness increase attributable to kin-discriminatory segregation was small. These findings suggest a relatively minor influence of kin-discriminatory segregation on relatedness in D. discoideum. We discuss our results comparing with the results of previous studies, including those of wild clone...Continue Reading

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Citations

Nov 18, 2014·Evolutionary Ecology·Avelina Espinosa, Guillermo Paz-Y-Miño-C
Mar 17, 2015·Journal of Evolutionary Biology·S R LevinJ E Strassmann
Mar 5, 2016·Evolution; International Journal of Organic Evolution·Jeff SmithDavid C Queller
Feb 26, 2015·Proceedings of the National Academy of Sciences of the United States of America·Paul B Rainey
Feb 14, 2016·The Journal of Eukaryotic Microbiology·Guillermo Paz-Y-Miño-C, Avelina Espinosa
Mar 7, 2018·Proceedings of the National Academy of Sciences of the United States of America·Suegene NohDavid C Queller
May 8, 2018·Proceedings of the National Academy of Sciences of the United States of America·Philip G MadgwickJason B Wolf
Jan 10, 2019·PloS One·Michelle RubinGad Shaulsky
Feb 26, 2016·The Journal of Eukaryotic Microbiology·Joan E Strassmann

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