Impaired associative learning after chronic exposure to pesticides in young adult honey bees

Neonicotinoids are the most widespread insecticides in agriculture, preferred for their low toxicity to mammals and their systemic nature. Nevertheless, there have been increasing concerns regarding their impact on non-target organisms. Glyphosate is also widely used in crops and, therefore, traces of this pesticide are likely to be found together with neonicotinoids. Although glyphosate is considered a herbicide, adverse effects have been found on animal species, including honey bees. Apis mellifera is one of the most important pollinators in agroecosystems and is exposed to both these pesticides. Traces can be found in nectar and pollen of flowers that honey bees visit, but also in honey stores inside the hive. Young workers, which perform in-hive tasks that are crucial for colony maintenance, are potentially exposed to both these contaminated resources. These workers present high plasticity and are susceptible to stimuli that can modulate their behaviour and impact on colony state. Therefore, by performing standardised assays to study sublethal effects of these pesticides, these bees can be used as bioindicators. We studied the effect of chronic joint exposure to fieldrealistic concentrations of the neonicotinoid imidacloprid and glyphosate on gustatory perception and olfactory learning. Both pesticides reduced sucrose responsiveness and had a negative effect on olfactory learning. Glyphosate also reduced food uptake during rearing. The results indicate differential susceptibility according to honey bee age. The two agrochemicals had adverse effects on different aspects of honey bee appetitive behaviour, which could have repercussions for food distribution, propagation of olfactory information and task coordination within the nest.Fil: Mengoni Goñalons, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; ArgentinaFil: Farina, Walter Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; Argentin

Effects of Sublethal Doses of Imidacloprid on Young Adult Honeybee Behaviour

Imidacloprid (IMI), a neonicotinoid used for its high selective toxicity to insects, is one of the most commonly used pesticides. However, its effect on beneficial insects such as the honeybee Apis mellifera L is still controversial. As young adult workers perform in-hive duties that are crucial for colony maintenance and survival, we aimed to assess the effect of sublethal IMI doses on honeybee behaviour during this period. Also, because this insecticide acts as a cholinergic-nicotinic agonist and these pathways take part in insect learning and memory processes; we used IMI to assess their role and the changes they suffer along early adulthood. We focused on appetitive behaviours based on the proboscis extension response. Laboratory reared adults of 2 to 10 days of age were exposed to sublethal IMI doses (0.25 or 0.50ng) administered orally or topically prior to behavioural assessment. Modification of gustatory responsiveness and impairment of learning and memory were found as a result of IMI exposure. These outcomes differed depending on age of evaluation, type of exposure and IMI dose, being the youngest bees more sensitive and the highest oral dose more toxic. Altogether, these results imply that IMI administered at levels found in agroecosystems can reduce sensitivity to reward and impair associative learning in young honeybees. Therefore, once a nectar inflow with IMI traces is distributed within the hive, it could impair in-door duties with negative consequences on colony performance.Fil: Mengoni Goñalons, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; ArgentinaFil: Farina, Walter Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Fisiología, Biología Molecular y Neurociencias. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisiología, Biología Molecular y Neurociencias; Argentin

Audioteca de RAC1

És una aplicació que dona suport a la nova web de RAC 1, gestionant les parts que el CMS web no pot fer o li és complicat. Gestiona els fitxers àudio en format MP3, permet la seva cerca, la gestió de programes i graelles, dona suport a l'app, RSS/Podcast

Flora pteridofítica de la Marina Alta (Alacant)

A partir de material d'herbari i referències bibliogràfiques es revisa i actualitza el catàleg de pteridòfits de la comarca de la Marina Alta (Alacant). Asplenium trichomanes L. subsp. inexpectans Lovis constitueix novetat per a la flora del País Valencià.A partir de material de herbario y de la recopilación de referencias bibliograficas se revisa y actualiza el catálogo de pteridófitos de la Marina Alta (Alicante). Asplenium trichomanes L. subsp. inexpectans Lovis supone novedad para la flora del País Valenciano.On the basis of herbarium material and bibliographic references, we have made a revision of the catalogue of Pteridophyta from Marina Alta (SE Iberian Peninsula). Asplenium trichomanes L. subsp. inexpectans Lovis is recorded for the first time in the Valencian Communit

7.3 Trabajo Decente para las trabajadoras domésticas. La movilización transnacional de las empleadas del hogar

La mobilització transnacional de les empleades de la llarProtesta social de las trabajadoras del hogar en pos del reconocimiento de derechos laborale

Conspectus of Helichrysum Mill. sect. Stoechadina (DC.) Gren. and Godr.(Asteraceae, Gnaphalieae)

Es presenta un conspectus de Helichrysum sect. Stoechadina (DC.) Gren. and Godr. Es reconeixen vuit espècies i cinc subespècies. Per cada taxó acceptat es relacionen tots el sinònims trobats a la bibliografia, a partir de l’estudi dels protòlegs, el material tipus i els nombrosos exemplars d’herbari que comprenen tota l’àrea de distribució i la variabilitat de cada espècie. S’aporten notes sobre l’àrea de distribució. Quatre noms han estat lectotipificats y es presenten també referencies sobre lectotipificacions prèvies.A conspectus of Helichrysum sect. Stoechadina (DC.) Gren. and Godr. is provided. Eight species and five subspecies are recognized. For each accepted taxa all synonyms found in the literature are listed, based on the study of the protologues, the type material, and numerous herbarium specimens comprising the whole distribution area and the variability of each species. Notes on the distribution area are provided. Four names are lectotypified, and references to previous lecotypifications are also presented

Cultes misterics i divinitats orientals a la Hispania Romana: Mitra, Isis i Serapis

Treballs Finals de Grau en Història, Facultat de Geografia i Història, Universitat de Barcelona, Curs: 2012-2013, Tutor: Victor Revilla Calv

Practicing Intersectionality in Spain

Intersectionality has become a very popular term in academic, policy and activist circles. We understand intersectionality as a theoretical project concerned with elucidating the re-lationships between different principles of inequality and oppression. We identify three conceptual moves that distinguish intersectionality from other theoretical frameworks about inequality and power: a movement from additive to interactive models, a movement from categorical to process-based frameworks, and a movement from autonomous individu-als to embedded social relations as foundations for social theory. We deploy examples re-lated to the paid domestic work in Spain to demonstrate the usefulness of these conceptual moves.El término interseccionalidad se ha vuelto muy popular en círculos académicos, políticos y activistas. Las autoras entienden la interseccionalidad como un proyecto teórico que busca analizar el modo en que distintas formas de desigualdad y opresión social se relacionan en-tre si. Las autoras identifican tres movimientos conceptuales que marcan este proyecto: sustituir modelos aditivos por modelos interactivos, reemplazar marcos teóricos que se ba-san en categorías sociales por modelos teóricos basados en procesos sociales, y tomar las relaciones sociales -y no la idea del individuo autónomo- como la unidad de análisis básica para construir teoría social. Las autoras ilustran el proyecto teórico y las implicaciones de los movimientos conceptuales a partir del análisis del trabajo doméstico en España