2014
DOI: 10.1590/1519-6984.20512 View full text |Buy / Rent full text
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Abstract: The life history and sex ratio data of the solitary wasp Trypoxylon agamemnon nesting in trap-nests in southern Brazil was recorded from January 2002 to December 2007. Its sex ratio is strongly female-biased, being bivoltine or multivoltine with until three generations per year. It has two alternative life histories (diapause and direct development) and overlapping generations. In addition to the conflict of interest between the sexes, it is possible that local mate competition occurs between males and may cau… Show more

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“…At the same time, although FR and MR did not show difference in birth rates in relation to PF, they also showed male-biased sex ratio for the emerging offspring. The sex ratio deviation for Trypoxylon species has also been recorded in other studies (Assis & Camillo 1997, Shintarou & Takayoshi 1999, Buschini 2007, Oliveira-Nascimento & Garófalo 2014, Buschini & Bergamaschi 2014. This feature has important consequences for individual fitness and population persistence and may occur in response to variations in environmental conditions, such as low food availability (Hamilton 1979, Molumby 1997, Shintarou & Takayoshi 1999.…”
Section: Discussionsupporting
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“…At the same time, although FR and MR did not show difference in birth rates in relation to PF, they also showed male-biased sex ratio for the emerging offspring. The sex ratio deviation for Trypoxylon species has also been recorded in other studies (Assis & Camillo 1997, Shintarou & Takayoshi 1999, Buschini 2007, Oliveira-Nascimento & Garófalo 2014, Buschini & Bergamaschi 2014. This feature has important consequences for individual fitness and population persistence and may occur in response to variations in environmental conditions, such as low food availability (Hamilton 1979, Molumby 1997, Shintarou & Takayoshi 1999.…”
Section: Discussionsupporting
“…Based on these findings, the author proposed that this species has good dispersal capacity. Studies involving other species of the genus also suggest that these wasps have a high emigration rate ( Freeman, 1981 ; Molumby, 1997 ; Buschini and Bergamaschi, 2010 , 2014 ; Buschini and Donatti, 2012 ). However, evidence regarding the degree of dispersal in T. albitarse is not coherent with the inter-population genetic differentiation observed in the present investigation and the one by Peruquetti (2003) .…”
Section: Discussionmentioning