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  • 1
    Electronic Resource
    Electronic Resource
    Evolution of sociality in the allodapine bees: a review of sex allocation, ecology and evolution (1998)
    Springer
    Insectes sociaux 45 (1998), S. 349-368 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Social evolution, sex allocation, kin selection, comparative studies, Exoneura, Apidae.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: Comparative studies provide one of the most powerful means of assessing the relative roles of selective agents underlying social evolution in insects. Because of the wide variation in social organisation, sex allocation and ecological traits within and between species of allodapine bees, this group provides a wealth of material for such comparative work. Recent studies on Australian allodapine bees are reviewed here and their consequences for understanding social evolution are discussed. Studies to date suggest the following trends: (i) benefits of group living appear to be linked to preventing brood failure rather than to increased brood rearing efficiency; (ii) female-biased sex allocation, when it occurs, is linked to benefits of group living and kinship among nestmates, and is probably mediated via local fitness enhancement; (iii) female-biased sex allocation patterns do not usually coincide with opportunities for sib-rearing and are therefore unlikely to facilitate eusociality; (iv) relatedness within colonies is usually high, but in some species females will nest with unrelated females if kin are not available; and (v) phylogenetic studies suggest that opportunities for sib-rearing, arising from brood development patterns and colony phenology, are plesiomorphic for the exoneurine group, but in at least one phylogenetically distal clade, Exoneura sensu stricto, the evolution of large group size and social complexity coincides with the loss or reduction of opportunities for sib-rearing. Assured fitness return models may be applicable to weakly social allodapine species, but do not predict patterns of eusociality. Instead, Australian studies suggest that the evolution of large group size and marked reproductive skew is linked with the need to defend against enemies at the nest, rather than high levels of relatedness, female biased sex allocation or opportunities to rear siblings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050095
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  • 2
    Electronic Resource
    Electronic Resource
    The role of young guards inXylocopa pubescens (1995)
    Springer
    Insectes sociaux 42 (1995), S. 427-448 
    Details
    ISSN: 1420-9098
    Keywords: Xylocopa ; Hymenoptera ; caste determination ; kin selection ; guarding behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Xylocopa pubescens is a facultatively social species in which two types of guards can be found: 1) old, formerly reproductive guards and 2) young, pre-reproductive guards that usually guard the nest in which they emerged. In this species it is always the dominant female that forages and lays the eggs. This paper focuses on the young females' reasons for guarding. Young guards are characteristically the first females of an emerging brood. They start guarding at an age of 6 days, and continue to do so for on average 10 days, when they start a dominance contest. In comparison to other emerging bees, guards did not receive any more of the incoming food. The presence of young females in the nest was sufficient to deter pollen robbers; the protection was not ameliorated by guarding. Guards did not protect the nest from usurpation by intruding females. The presence of a young guard positively influenced both the number and the duration of foraging flights. All guards attempted to take over dominance inside the nest by fighting with the dominant female. Guards had a probability of 50% of winning this contest, which was distinctly higher than their probability of finding a nest elsewhere. The dominant female was not in all cases the mother of the guard. Therefore, the average increase of indirect fitness by guarding was lower than the expected direct fitness returns from leaving the nest earlier. We therefore conclude that guarding females are environmentally disabled, hopeful reproductives. They may be guarding to determine the right time to risk a fight about dominance and to increase their direct fitness if their attempt to supersede is successful.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242171
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  • 3
    Electronic Resource
    Electronic Resource
    Task allocation and reproductive skew in social mass provisioning carpenter bees in relation to age and size (1999)
    Springer
    Insectes sociaux 46 (1999), S. 198-207 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Reproductive competition, Xylocopa, Ceratina, oophagy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: The mass provisioning carpenter bees comprise two tribes, the Xylocopini and the Ceratinini. Although social nesting occurs in both tribes, no morphological castes have evolved and females are totipotent, which makes the tribe as a whole highly suitable to test predictions of reproductive skew models. We review current information for the two tribes with respect to reproductive competition and reproductive skew and then investigate whether the observed skew fits with predictions from optimal skew theory. Social nests of Xylocopa species include a non-foraging guard and a foraging egg layer who completely dominates reproduction. Reproductive dominance is settled by aggression, and the probability of winning this fight is influenced by both age and size. In Ceratina species, task allocation is also very clear: one female guards the nest, while the other female(s) forage(s). Although the guard is usually the first to produce an egg, her eggs are frequently replaced by those of the forager, and skew is incomplete. ¶Using comparisons between species and genera the impact of ecological constraints on solitary nesting, relative group productivity and relatedness on reproductive partitioning between dominants and subordinates are investigated in a qualitative way. In support of the optimal skew model, strong constraints on solitary nesting coincided with strong skew. However, the predicted effects of relatedness and group productivity on skew were not found. Furthermore, no support was found for the predictions of the optimal skew model that high skew coincides with frequent aggressive testing and risky task performance by subordinates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050135
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of multiple mating on kin recognition by worker honeybees (1988)
    Springer
    Naturwissenschaften 75 (1988), S. 412-413 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377820
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  • 5
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    Influence of multiple mating on kin recognition by worker honeybees (1988)
    Springer
    Details
    Publication Date: 1988-08-01
    Print ISSN: 0028-1042
    Electronic ISSN: 1432-1904
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Published by Springer
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