Dominant-subordinate social interactions and subordinate behavioral responses in the primitively eusocial sweat bee Augochlora phoemonoe (Hymenoptera: Halictidae)

Dalmazzo, Milagros; Roig‐Alsina, Arturo

doi:10.1007/s13592-018-0609-8

Cited by 4 publications

(5 citation statements)

References 27 publications

(31 reference statements)

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“…(A.) phoemonoe (Dalmazzo and Roig-Alsina 2012, 2015, 2018a, 2018b, our results point to the presence of primitively eusocial species in at least three of the five Augochlora s. str. species groups, indicating that the exclusive solitary behavior of A.…”

Section: The Social Behavior Of Augochlorasupporting

confidence: 58%

“…Regarding social behavior, nesting above ground did not limit Augochlora s. str. to the solitary lifestyle (Dalmazzo and Roig-Alsina 2012, 2015, 2018a, 2018b. Examining other augochlorine wood nesters, Megalopta and allied genera can be primitively eusocial (Kapheim et al 2020), but for Neocoynura this behavior was not yet published (Brosi et al 2006) and there are no morphological clues such as female polymorphisms.…”

Section: Nesting Biology Insightsmentioning

confidence: 99%

“…A broad sample of the behavioral diversity found in Augochlorini is present also in Augochlora, since species have particular nesting substrate preferences and sorts of social organization (Michener and Lange 1958;Stockhammer 1966;Dalmazzo and Roig-Alsina 2012, 2015, 2018a, 2018b. Previously, it was believed that eusocial behavior was restricted to the subgenus Oxystoglossella, especially due to long-term observations of nests of the solitary A.…”

Section: Introductionmentioning

confidence: 99%

“…Posteriorly, it was noted that other Augochlora s. str. species exhibit eusociality (Wcislo et al 2003;Dalmazzo and Roig-Alsina 2012, 2015, 2018a, 2018b. In the primitively eusocial species, morphological variation among nestmates may be restricted to overall body size, as in A.…”

Section: Introductionmentioning

confidence: 99%

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Bayesian and parsimony phylogeny of Augochlora bees (Hymenoptera: Apoidea) based on morphology: insights for their biogeography and natural history

Lepeco¹,

Gonçalves²

2022

ASP

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Augochlora Smith, with 127 valid species, is the most widespread genus of Augochlorini bees, ranging from Argentina to southern Canada, including the Caribbean islands. The genus is divided into three subgenera, Augochlora s. str., Oxystoglossella Eickwort, and the fossil Electraugochlora Engel. The extant subgenera were traditionally diagnosed by their nesting substrate, social behavior and morphology. However, accumulating evidence suggests that these features are not reliable for their separation, especially with the discovery of an enigmatic species sharing characteristics from both subgenera. Our objective is to provide a phylogenetic hypothesis to evaluate the monophyly of the extant subgenera and to place a new species, Augochlora (Augochlora) intermedia sp. nov. For this purpose, we compiled 110 unordered characters for 40 species of Augochlora plus seven outgroup species and analyzed under parsimony and Bayesian inference. Topologies were very similar under both frameworks, allowing us to consistently characterize a few major lineages. Our results demonstrate that the extant subgenera correspond to monophyletic groups and the new species is sister group to remaining Augochlora s. str. species. Both subgenera are widespread in the Western Hemisphere, with species groups differing in range and distributional patterns. Our interpretation is that Augochlora arose in South America, subsequently colonizing Mesoamerica, the Caribbean and North America several times. Facultative social behavior can be found in both subgenera and in most lineages, indicating that the exclusive solitary behavior found in Augochlora pura is an exception. Based on morphological clues we interpret that the habit of nesting out of the soil arose once in Augochlora s. str.

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Section: The Social Behavior Of Augochlorasupporting

confidence: 58%

Section: Nesting Biology Insightsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bayesian and parsimony phylogeny of Augochlora bees (Hymenoptera: Apoidea) based on morphology: insights for their biogeography and natural history

Lepeco¹,

Gonçalves²

2022

ASP

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“…As L. malachurum nests are situated below ground level, we were unable to observe queen-helper interactions in our field study. However, queens have been shown to influence helper task management within laboratory nests of other sweat bee species (Breed and Gamboa, 1977;Dalmazzo and Roig-Alsina, 2018), although the effect of queen size is unknown.…”

Section: Queen Controlmentioning

confidence: 99%

Split sex ratios and genetic relatedness in a primitively eusocial sweat bee

Pennell

Field

2020

Behav Ecol Sociobiol

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In eusocial Hymenoptera, queens and their helper offspring should favour different sex investment ratios. Queens should prefer a 1:1 investment ratio, as they are equally related to offspring of both sexes (r = 0.5). In contrast, helpers should favour an investment ratio of 3:1 towards the production of female brood. This conflict arises because helpers are more closely related to full sisters (r = 0.75) than brothers (r = 0.25). However, helpers should invest relatively more in male brood if relatedness asymmetry within their colony is reduced. This can occur due to queen replacement after colony orphaning, multiple paternity and the presence of unrelated alien helpers. We analysed an unprecedentedly large number of colonies (n = 109) from a UK population of Lasioglossum malachurum, an obligate eusocial sweat bee, to tease apart the effects of these factors on colony-level investment ratios. We found that multiple paternity, unrelated alien helpers and colony orphaning were all common. Queen-right colonies invested relatively more in females than did orphaned colonies, producing a split sex ratio. However, investment ratios did not change due to multiple paternity or the presence of alien helpers, reducing inclusive fitness pay-offs for helpers. Queen control may also have been important: helpers rarely laid male eggs, and investment in female brood was lower when queens were large relative to their helpers. Genetic relatedness between helpers and the brood that they rear was 0.43 in one year and 0.37 in another year, suggesting that ecological benefits, as well as relatedness benefits, are necessary for the maintenance of helping behaviour. Significance statement How helping behaviour is maintained in eusocial species is a key topic in evolutionary biology. Colony-level sex investment ratio changes in response to relatedness asymmetries can dramatically influence inclusive fitness benefits for helpers in eusocial Hymenoptera. The extent to which helpers in primitively eusocial colonies can respond adaptively to different sources of variation in relatedness asymmetry is unclear. Using data from 109 colonies of the sweat bee Lasioglossum malachurum, we found that queen loss, but not multiple paternity or the presence of alien helpers, was correlated with colony sex investment ratios. Moreover, we quantified average helper-brood genetic relatedness to test whether it is higher than that predicted under solitary reproduction (r = 0.5). Values equal to and below r = 0.5 suggest that relatedness benefits alone cannot explain the maintenance of helping behaviour. Ecological benefits of group living and/or coercion must also contribute.

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