Delivery of crop pollination services is an insufficient argument for wild pollinator conservation

There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it is unclear how much biodiversity is needed to deliver ecosystem services in a cost-effective way. Here we show that, while the contribution of wild bees to crop production is significant, service delivery is restricted to a limited subset of all known bee species. Across crops, years and biogeographical regions, crop-visiting wild bee communities are dominated by a small number of common species, and threatened species are rarely observed on crops. Dominant crop pollinators persist under agricultural expansion and many are easily enhanced by simple conservation measures, suggesting that cost-effective management strategies to promote crop pollination should target a different set of species than management strategies to promote threatened bees. Conserving the biological diversity of bees therefore requires more than just ecosystem-service-based arguments

Rol del psicólogo en la Unidad de Coloproctología del Instituto Autónomo Hospital Universitario de Caracas

El rol del psicólogo se configura en torno a las demandas que surgen en la sociedad y la población con la que se trabaja. En el ámbito hospitalario, se ha destacado la importancia de la inclusión de profesionales de la psicología en el abordaje integral de los pacientes; sobre todo en lo que respecta a las enfermedades anorrectales, cuya etiología se conforma tanto por afecciones estructurales como variables psicológicas. Dentro de la Unidad de Coloproctología del Hospital Universitario de Caracas se han realizado investigaciones que han permitido la convergencia entre ambas disciplinas, destacándose esta última referente al perfil basado en competencias que debe tener el psicólogo que labore dicha unidad