The effects of the social hierarchy destabilization on the foraging activity of eusocial wasp Mischocyttarus cerberus styx Richards, 1940 (Hymenoptera: Vespidae: Polistinae)

The genus Mischocyttarus comprises 245 species of neotropical basal eusocial wasps. They form small colonies (rarely more than few tens of individuals); castes are morphologically undifferentiated and determined behaviorally by agonistic interactions. The aim of this study was to verify the effects of the experimental disruption of social hierarchy on foraging activity of Mischocyttarus cerberus styx. We observed six colonies in postemergence phase and recorded data on the foraging activity under two experimental conditions: (1) removal of lower-ranked females and (2) removal of higher ranked females, except the queen. Our results showed that the removal of higher-ranked females had higher effect on the number of foraging trips of M. cerberus styx than the removal of lower-ranked females (the number of foraging trips/hour decreased by 66.4 and 32.7, resp.). Such results are likely due to the social organization of this species and the presence of a distinct class of females, which in this study were regarded as intermediates. Our data also showed that, irrespective of the hierarchical status of the females, the removal of two or three individuals affected significantly the number of foraging trips in this species. Copyright 2011 Vanderlei Conceio Costa Filho et al.

Estimación de la migración interna neta, clasificada por edad y por sexo, en las provincias y regiones de Chile durante los años 1930-1940, 1940-1952 y 1952-1960

Incluye Bibliografía

Discrepancies between abstracts presented at international association for dental research annual sessions from 2004 to 2005 and full-text publication

Purpose. The purpose of this study was to evaluate the discrepancies between abstracts presented at the IADR meeting (2004-2005) and their full-text publication. Material and Methods. Abstracts from the Prosthodontic Section of IADR meeting were obtained. The following information was collected: abstract title, number of authors, study design, statistical analysis, outcome, and funding source. PubMed was used to identify the full-text publication of the abstracts. The discrepancies between the abstract and the full-text publication were examined, categorized as major and minor discrepancies, and quantified. The data were collected and analyzed using descriptive analysis. Frequency and percentage of major and minor discrepancies were calculated. Results. A total of 109 (95.6%) articles showed changes from their abstracts. Seventy-four (65.0%) and 105 (92.0%) publications had at least one major and one minor discrepancies, respectively. Minor discrepancies were more prevalent (92.0%) than major discrepancies (65.0%). The most common minor discrepancy was observed in the title (80.7%), and most common major discrepancies were seen in results (48.2%). Conclusion. Minor discrepancies were more prevalent than major discrepancies. The data presented in this study may be useful to establish a more comprehensive structured abstract requirement for future meetings. © 2012 Soni Prasad et al.

La mortalidad en Chile según las tablas de vida de 1920, 1930, 1940, 1952-1960

Incluye Bibliografía

Políticas de población y atribuciones de la mujer en la Argentina de 1940: la realidad en disonancia con la teoría

Incluye Bibliografía

Brasil: evolucion de la poblacion economicamente activa en el periodo 1940-1950

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Chile. XI Censo de poblacion (1940). Recopilacion de cifras publicadas por la Direccion de Estadisticas y Censos

Incluye Bibliografía

Differential migration in some regions and cities of Latin America in the period 1940-1950

Includes bibliography

Proyeccion de la poblacion del Brasil, por sexo y grupos de edad, 1940-1980

Incluye Bibliografía

Breve analisis de las declaraciones por sexo y edad de los censos de poblacion de Chile de 1930, 1940, 1952 y 1960

Incluye Bibliografía

La planificación del desarrollo y redistribución espacial de la población: el caso de México: 1940-78

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Antecedentes estadísticos de la distribución del ingreso: Chile, 1940-1982

Incluye Bibliografía