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  • 1
    Electronic Resource
    Electronic Resource
    Effects of social organization on gene flow in the fire ant Solenopsis invicta (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 613-616 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The fire ant Solenopsis invicta includes two distinctive social forms that differ in the number of egg-laying queens per nest; nests of the monogyne (M) form contain only a single queen, whereas those of the polygyne (P) form may contain 200 or more queens8. The two forms occur sympatrically in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383613a0
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  • 2
    Electronic Resource
    Electronic Resource
    Selfish genes: a green beard in the red fire ant (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 394 (1998), S. 573-575 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A ‘green-beard’ gene is defined as a gene that causes a phenotypic effect (such as the presence of a green beard or any other conspicuous feature), allows the bearer of this feature to recognize it in other individuals, and causes the bearer to behave differently towards other ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/29064
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  • 3
    Electronic Resource
    Electronic Resource
    Unusual Behavior of Polygyne Fire Ant Queens on Nuptial Flights (2000)
    Springer
    Journal of insect behavior 13 (2000), S. 455-468 
    Details
    ISSN: 1572-8889
    Keywords: Solenopsis invicta ; polygyne ; fire ants ; monogyne ; social insects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study reports previously undescribed behavior of fire ant queens (Solenopsis invicta) on their nuptial flights. We captured large numbers of alate (winged) queens flying at low altitudes in dense swarms that were virtually devoid of males. We assayed the genotypes of these alate queens at the locus Gp-9, which exhibits strong genotype frequency differences between monogyne (single-queen) and polygyne (multiple-queen) populations, and found that almost all of these low-flying queens originated from polygyne colonies. Comparisons of mtDNA haplotype distributions of these queens to those of alates leaving polygyne nests suggest that the flying queens had not dispersed more than a few hundred meters. Moreover, the proportion of flying queens that were mated did not differ significantly from the proportion of reproductive queens that were mated within the same sites. Thus the flight behavior appears to occur subsequent to mating. We suggest that the flying queens are sampling the local environment in order to select a suitable landing site. Such a site would contain established polygyne nests into which the queens may be adopted as new reproductives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007770404496
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  • 4
    Electronic Resource
    Electronic Resource
    Strong selection on a gene that influences reproductive competition in a social insect (1992)
    [s.l.] : Nature Publishing Group
    Nature 355 (1992), S. 347-349 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The fire ant Solenopsis invicta is an advanced eusocial insect in which two distinct forms of social organization exist. Colonies in monogyne populations are simple families headed by a single reproductive queen, whereas colonies in polygyne populations contain up to several hundred ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/355347a0
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  • 5
    Electronic Resource
    Electronic Resource
    Kin selection and the problem of sperm utilization in social insects (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 798-800 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Minimum number of matings by queens of two social wasp species, as determined from the diversity and distribution of multi-locus genotypes among female progeny. The ability to detect greater numbers of matings is constrained by the number of polymorphic genetic markers available for each ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/323798a0
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  • 6
    Electronic Resource
    Electronic Resource
    Lack of detectable nepotism in multiple-queen colonies of the fire ant Solenopsis invicta (Hymenoptera: Formicidae) (1997)
    Springer
    Behavioral ecology and sociobiology 40 (1997), S. 27-33 
    Details
    ISSN: 1432-0762
    Keywords: Key words  Kin discrimination  ;  Kin selection  ;   Relatedness  ;  Fire ants  ;  Solenopsis invicta
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Multiple-queen (polygyne) colonies of the introduced fire ant Solenopsis invicta present a paradox for kin selection theory. Egg-laying queens within these societies are, on average, unrelated to one another, and the numbers of queens per colony are high, so that workers appear to raise new sexuals that are no more closely related to them than are random individuals in the population. This paradox could be resolved if workers discriminate between related and unrelated nestmate sexuals in important fitness-related contexts. This study examines the possibility of such nepotism using methods that combine the following features: (1) multiple relevant behavioral assays, (2) colonies with an unmanipulated family structure, (3) multiple genetic markers with no known phenotypic effects, and (4) a statistical technique for distinguishing between nepotism and potentially confounding phenomena. We estimated relatedness between interactants in polygyne S. invicta colonies in two situations, workers tending egg-laying queens and workers feeding maturing winged queens. In neither case did we detect a significant positive value of relatedness that would implicate nepotism. We argue that the non-nepotistic strategies displayed by these ants reflect historical selection pressures experienced by native populations, in which nestmate queens are highly related to one another. The markedly different genetic structure in native populations may favor the operation of stronger higher-level selection that effectively opposes weaker individual-level selection for nepotistic interactions within nests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002650050312
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  • 7
    Electronic Resource
    Electronic Resource
    Seasonal decline in intracolony genetic relatedness in eastern tent caterpillars: implications for social evolution (1993)
    Springer
    Behavioral ecology and sociobiology 32 (1993), S. 47-54 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetic relatedness in social insect colonies may vary spatially or temporally as a result of changes in colony membership due to immigration or to variation in patterns of maternity and paternity. We estimated relatedness for eastern tent caterpillars (Malacosoma americanum) in laboratory colonies derived from egg masses using multilocus genotypic data derived from electrophoresis. This estimate is compared with estimates obtained from colony samples taken in the field at four intervals spanning the larval developmental season. We found that average intracolony relatedness is close to 0.5 initially but declines through the developmental season due to colony merging, showing that caterpillars do not discriminate between siblings and nonsiblings in order to preserve colony family structure. Using the intracolony values together with relatedness values for higher levels of population structure, we estimated the effective mean number of simple families represented in single colonies through the season. The overall effective number of families per tent increased from one at the time of eclosion to 1.3 by the end of the season. Average intracolony relatedness remained relatively high despite the occurrence of colony merging, apparently as a result of the low density of tents on most trees, combined with high relatedness within the original colonies. Thus, high intracolony relatedness is maintained in M. americanum populations through the effects of adult dispersal, mating, and oviposition patterns, rather than through behavioral discrimination mechanisms of the larvae. These findings underscore the importance of considering the causes of temporal variation in genetic relatedness as well as the consequences for the indirect component of inclusive fitness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172222
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  • 8
    Electronic Resource
    Electronic Resource
    Phenotypic plasticity and “cultural transmission” of alternative social organizations in the fire ant Solenopsis invicta (1993)
    Springer
    Behavioral ecology and sociobiology 33 (1993), S. 121-129 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We investigated the process of sexual maturation in winged queens of the fire ant Solenopsis invicta, a species with two distinct forms of social organization. We found that queens of the monogynous social form (single reproductive queen per colony) differ little or not at all from queens of the polygynous form (multiple reproductive queens per colony) in weight and fat content when these are pupae or newly-eclosed adults. Furthermore, the size of a sclerotized region of the adult thorax, which is set during larval growth, does not differ between queens of the two forms. In contrast, winged queens of the two social forms differ dramatically in their physiological phenotypes once they have matured, with monogynous queens weighing more and having greater fat reserves than polygynous queens. A crossfostering experiment revealed that the different maturation processes of queens of the two forms are induced largely by the type of colony in which a queen matures (monogynous or polygynous) rather than being due to intrinsic genetic differences between the forms. However, genetic variation at a single locus does appear to play some role in determining physiological phenotype in queens of the polygynous form, providing an example of genotype-environment interaction in the expression of these physiological traits. Differences between the social forms in the mature phenotypes that are produced constrain the reproductive options of queens, so that the characteristic social organization of a colony is perpetuated by virtue of the social environment in which new queens are reared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171663
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  • 9
    Electronic Resource
    Electronic Resource
    Diploid male production — a significant colony mortality factor in the fire ant Solenopsis invicta (Hymenoptera: Formicidae) (1986)
    Springer
    Behavioral ecology and sociobiology 19 (1986), S. 283-291 
    Details
    ISSN: 1432-0762
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two forms of the fire ant, Solenopsis invicta, occur in North America; the monogyne form has colonies with a single functional queen while the polygyne form has colonies containing many functional queens. Field surveys indicate that diploid males are common in natural populations of the polygyne form but absent from monogyne populations, in contrast to laboratory data showing that similar frequencies of queens producing such males occur in the two types of populations. Our results show that mature monogyne colonies with adopted queens rear diploid males in the laboratory, so it is unlikely that the absence of these males from monogyne colonies in the field is due to discrimination against them by monogyne workers. On the other hand, incipient monogyne colonies that produce diploid males exhibit significantly higher mortality and significantly slower rates of growth (Figs. 1–3) than colonies producing workers only. These results suggest that the observed distribution of male diploidy in S. invicta can be explained by differential mortality of diploid male producing colonies of the two forms, with such colonies of the monogyne form experiencing 100% mortality early in development. The mortality differences due to this factor are shown to be related to the different social structures and modes of colony founding characterizing the two forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00300643
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  • 10
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    Nuclear and mitochondrial genetic structure in two social forms of the fire ant Solenopsis invicta: insights into transitions to an alternate social organization (1997)
    Springer Nature
    Details
    Publication Date: 1997-06-01
    Print ISSN: 0018-067X
    Electronic ISSN: 1365-2540
    Topics: Biology
    Published by Springer Nature
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