Male dimorphism in Perdita portalis (Hymenoptera, Andrenidae) has arisen from preexisting allometric patterns

Danforth, Bryan N.; Desjardins, Christopher A.

doi:10.1007/s000400050107

Cited by 34 publications

(18 citation statements)

References 56 publications

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“…Measures of head width and interocular distance are linearly and isometrically related to body size (wet and dry weight) in a number of other bee species in which, like O. rufa, males do not exhibit extreme size variation linked to alternative mating strategies (Danforth and Desjardins, 1999;Marlovits, 1994;Rust, 1991).…”

Section: Size Measurementsmentioning

confidence: 99%

Female choice in the red mason bee,Osmia rufa(L.) (Megachilidae)

Conrad

Paxton²,

Barth

et al. 2010

Journal of Experimental Biology

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SUMMARYFemales are often thought to use several cues and more than one modality in selection of a mate, possibly because they offer complementary information on a mate's suitability. In the red mason bee, Osmia rufa, we investigated the criteria a female uses to choose a mating partner. We hypothesized that the female uses male thorax vibrations and size as signs of male viability and male odor for kin discrimination and assessment of genetic relatedness. We therefore compared males that had been accepted by a female for copulation with those rejected, in terms of their size, their immediate precopulatory vibrations (using laser vibrometry), the genetic relatedness of unmated and mated pairs (using microsatellite markers) and emitted volatiles (using chemical analyses). Females showed a preference for intermediate-sized males that were slightly larger than the modal male size. Furthermore, male precopulatory vibration burst duration was significantly longer in males accepted for copulation compared with rejected males. Vibrations may indicate vigor and assure that males selected by females are metabolically active and healthy. Females preferentially copulated with males that were genetically more closely related, possibly to avoid outbreeding depression. Volatiles of the cuticular surface differed significantly between accepted and rejected males in the relative amounts of certain hydrocarbons, although the relationship between male odor and female preference was complex. Females may therefore also use differences in odor bouquet to select among males. Our investigations show that O. rufa females appear to use multiple cues in selecting a male. Future investigations are needed to demonstrate whether odor plays a role in kin recognition and how the multiple cues are integrated in mate choice by females. Supplementary material available online at

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Section: Size Measurementsmentioning

confidence: 99%

Female choice in the red mason bee,Osmia rufa(L.) (Megachilidae)

Conrad

Paxton²,

Barth

et al. 2010

Journal of Experimental Biology

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“…This would open up study of the evolutionary origins of intraspecific diversity in male mating behaviour or morphology (Danforth and Desjardins, 1999). An important and still open question is the extent to which interindividual variation in male behaviour is genetically determined or is conditional upon environment (e.g.…”

Section: Intraspecific Variabilitymentioning

confidence: 99%

Male mating behaviour and mating systems of bees: an overview

2005

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-Considerable interspecific diversity exists among bees in the rendezvous sites where males search for females and in the behaviours employed by males in their efforts to secure matings. I present an evolutionary framework in which to interpret this variation, and highlight the importance for the framework of (i) the distribution of receptive (typically immediate post-emergence) females, which ordinarily translates into the distribution of nests, and (ii) the density of competing males. Other than the highly polyandrous honey bees (Apis), most female bees are thought to be monandrous, though genetic data with which to support this view are generally lacking. Given the opportunity, male bees are typically polygamous. I highlight intraspecific diversity in rendezvous site, male behaviour and mating system, which is in part predicted from the conceptual framework. Finally, I suggest that inbreeding may be far more widespread among bees than has hitherto been considered the case.Apoidea / rendezvous site / scramble competition / territoriality / inbreeding

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“…A measure of cephalic polymorphism was the genal index (per Sakagami and Moure, 1965), calculated as the division of the genal width by eye width. Due to the striking variation in head size, we also used a number of other measurements to assess overall body size including: intertegular distance, which reliably correlates which with body weight in a variety of bees (Cane, 1987); hind tibia length (per Danforth and Desjardins, 1999); and the wing length of one randomly chosen forewing, measured as the distance from the axillary sclerites to the base of the stigma. The number of nicks and tears along the distal margin of this wing was taken as a measure of wing wear.…”

Section: Dissections and Morphometricsmentioning

confidence: 99%

Nesting Biology and Social Behavior of Xenochlora Bees (Hymenoptera: Halictidae: Augochlorini) from Perú

Tierney¹,

Gonzales‐Ojeda²,

Wcislo³

2008

Journal of the Kansas Entomological Society

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The augochlorine (Halictidae) bee genus Xenochlora is the diurnal sister group to the nocturnal Megalopta, both of which are stem-nesting halictid bees. Here we present notes on the nesting biology and social behavior in four nests of Xenochlora nigrofemorata and one nest of X. ianthina from Madre de Dios, Peru. All nests contained multiple females and dissections of X. nigrofemorata indicated within nest reproductive differentiation among females that is associated with body size. Size variation among females is conspicuous and a variety of morphometrics are examined to document it. A genal index is used to describe cephalic variation, and results are compared with seven other halictine bees. All morphometrics were investigated for measurement error. Nests of Xenochlora appear to be founded by single females and multifemale nests clearly exhibit parasocial behavior and we hypothesize that they temporally switch between semisocial, eusocial and possibly communal phases.KEYWORDS: Halictidae, Augochlorini, Xenochlora, social evolution, size variation, stem nest RESUMEN: El genero de abejas Xenochlora (Augochlorini, Halictidae) es el grupo hermano diurno del genero nocturno Megalopta. Ambos grupos son abejas que construyen sus nidos en madera en descomposicion. Aqui presentamos anotaciones sobre la biologia de anidacion y comportamiento social en cuatro nidos de Xenochlora nigrofemorata y un nido de X. ianthina en Madre de Dios, Peru. Todos los nidos contenian multiples hembras y las disecciones de X. nigrofemorata indican que hay diferenciacion reproductiva entre las hembras de un nido, asociada con el tamaho del cuerpo. El polimorfismo entre las hembras es evidente y una serie de mediciones morfometricas son examinadas para documentar la variation en tamaho. Un indice genal es utilizado para describir el polimorfismo cefalico y los resultados son comparados con otras especies de abejas halictidas. Todas las mediciones morfometricas fueron analizadas para determinar el error de medicion. Los nidos de Xenochlora parecen ser fundados por hembras solitarias y los nidos con hembras multiples exhiben claramente un comportamiento parasocial y es posible que temporalmente intercambien entre fases semisocial, eusocial y posiblemente comunal.

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Male dimorphism in Perdita portalis (Hymenoptera, Andrenidae) has arisen from preexisting allometric patterns

Cited by 34 publications

References 56 publications

Female choice in the red mason bee,Osmia rufa(L.) (Megachilidae)

Female choice in the red mason bee,Osmia rufa(L.) (Megachilidae)

Male mating behaviour and mating systems of bees: an overview

Nesting Biology and Social Behavior of Xenochlora Bees (Hymenoptera: Halictidae: Augochlorini) from Perú

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