Range-wide genetic analysis of an endangered bumble bee (Bombus affinis, Hymenoptera: Apidae) reveals population structure, isolation by distance, and low colony abundance.

Declines in bumble bee species range and abundances are documented across multiple continents and have prompted the need for research to aid species recovery and conservation. The rusty patched bumble bee (Bombus affinis) is the first federally listed bumble bee species in North America. We conducted a range-wide population genetics study of B. affinis from across all extant conservation units to inform conservation efforts. To understand the species' vulnerability and help establish recovery targets, we examined population structure, patterns of genetic diversity, and population differentiation. Additionally, we conducted a site-level analysis of colony abundance to inform prioritizing areas for conservation, translocation, and other recovery actions. We find substantial evidence of population structuring along an east-to-west gradient. Putative populations show evidence of isolation by distance, high inbreeding coefficients, and a range-wide male diploidy rate of ~15%. Our results suggest the Appalachians represent a genetically distinct cluster with high levels of private alleles and substantial differentiation from the rest of the extant range. Site-level analyses suggest low colony abundance estimates for B. affinis compared to similar datasets of stable, co-occurring species. These results lend genetic support to trends from observational studies, suggesting that B. affinis has undergone a recent decline and exhibit substantial spatial structure. The low colony abundances observed here suggest caution in overinterpreting the stability of populations even where B. affinis is reliably detected interannually. These results help delineate informed management units, provide context for the potential risks of translocation programs, and help set clear recovery targets for this and other threatened bumble bee species.

Zoom sur le cancer du col utérin chez les adolescentes à Kananga au Kasaï-Central, en République Démocratique du Congo / NA

Introduction. Le cancer du col de l'utérus (CCU) demeure un problème majeur de santé publique et il est le quatrième cancer le plus répandu chez les femmes à l'échelle mondiale. L'objectif est de contribuer à l'améliorationde niveau de connaissance des adolescentes sur le cancer du col utérin dans la ville de Kananga.Matériel et méthodes.Il s'agit d'une étude transversaledescriptive sur le cancer du col utérin, réalisée dans la ville de Kananga et dont l'étude était basée sur l'interview de 436 Adolescentes selon un échantillonnage à plusieurs degrés, dans les Aires de Santé de la Zone de Santé Urbaine de Kananga.Résultats. La moyenne d'âge des répondantes était de 17,7 ± 1,2 ans. Le niveau de connaissances sur le cancer du col utérin s'est révélé inadéquat chez presque toutes les participantes (90%). Les signes couramment connus étaient le saignement vaginal (80,3%), dyspareunie (4,8%) et règles prolongés (2,3%). Le sexe était pratiqué dans55,5% des adolescents alors que 70,9% savaient l'existence du lien entre le cancer du col utérin et les infections sexuellement transmissible (IST). Les connaissances sur lesfacteurs de risque de survenu du cancer du col étaient: la consummation de tabacdans 31,9% et le rapport sexuel précoce dans 25,5%; la pratique du dépistage était observée dans 0,2% des cas et 37,2% d'adolescentes connaissaient que toutes les femmes étaient prédisposées de développer la pathologie.Conclusion.Le niveau de connaissances de cancer du col utérin s'est révélé inadéquat chez les adolescents et nécessité des campagnes destinées à sensibiliser d'avantage toutes les femmes en particulier et le public de la ville de Kananga en général au sujet de ce cancer du col utérin

Floral and nesting resources, habitat structure, and fire influence bee distribution across an open-forest gradient.

Given bees' central effect on vegetation communities, it is important to understand how and why bee distributions vary across ecological gradients. We examined how plant community composition, plant diversity, nesting suitability, canopy cover, land use, and fire history affected bee distribution across an open-forest gradient in northwest Indiana, USA, a gradient similar to the historic Midwest United States landscape mosaic. When considered with the other predictors, plant community composition was not a significant predictor of bee community composition. Bee abundance was negatively related to canopy cover and positively to recent fire frequency, bee richness was positively related to plant richness and abundance of potential nesting resources, and bee community composition was significantly related to plant richness, soil characteristics potentially related to nesting suitability, and canopy cover. Thus, bee abundance was predicted by a different set of environmental characteristics than was bee species richness, and bee community composition was predicted, in large part, by a combination of the significant predictors of bee abundance and richness. Differences in bee community composition along the woody vegetation gradient were correlated with relative abundance of oligolectic, or diet specialist, bees. Because oligoleges were rarer than diet generalists and were associated with open habitats, their populations may be especially affected by degradation of open habitats. More habitat-specialist bees were documented for open and forest/scrub habitats than for savanna/woodland habitats, consistent with bees responding to habitats of intermediate woody vegetation density, such as savannas, as ecotones rather than as distinct habitat types. Similarity of bee community composition, similarity of bee abundance, and similarity of bee richness between sites were not significantly related to proximity of sites to each other. Nestedness analysis indicated that species composition in species-poor sites was not merely a subset of species composition at richer sites. The lack of significant proximity or nestedness effects suggests that factors at a small spatial scale strongly influence bees' use of sites. The findings indicate that patterns of plant diversity, nesting resource availability, recent fire, and habitat shading, present at the scale of a few hundred meters, are key determinants of bee community patterns in the mosaic open-savanna-forest landscape.