Summary
Genetic relatedness and mating structure of the red ant, Myrmica ruginodis, were studied from a large data set in several natural populations, one of which was a substructured archipelago population. Within-colony relatedness of worker nestmates was measured as genotypic correlation and mating structure as deviation from random mating; both were calculated from the genotype frequency data. The average relatedness of worker nestmates was rather high across populations (0.43–0.73), and random mating was the rule within populations. The data were used to deduce the social structure of populations. With one possible exception, populations turned out to be weakly polygynous, implying that they consisted of the macrogyne form of the species. The exceptional population was relatively more polygynous and inbred, suggesting that it might include the microgyne form. This exceptional population lived in a habitat not noticeably different from that of the other populations, challenging previous suggestions of the habitat specialization of the two forms. The colonies were facultatively polygynous, and a comparison with earlier studies shows that polygyny is functional. Relatedness of worker nestmates varied slightly among populations, indicating that the social structure of Myrmica colonies is flexible.
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Seppii, P. Genetic relatedness of worker nestmates in Myrmica ruginodis (Hymenoptera : Formicidae) populations. Behav Ecol Sociobiol 30, 253–260 (1992). https://doi.org/10.1007/BF00166710
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DOI: https://doi.org/10.1007/BF00166710