Search results for "InSe"
showing 10 items of 3069 documents
The response of Trissolcus basalis to footprint contact kairomones from Nezara viridula females is mediated by leaf epicuticular waxes.
2009
Chemical footprints left behind by true bugs are perceived as contact kairomones by scelionid egg parasitoids. Female wasps encountering a contaminated artificial substrate display a characteristic arrestment posture, holding the body motionless and antennating the surface. In the system Nezara viridula (L.) and its egg parasitoid Trissolcus basalis (Wollaston), previous studies have shown that the kairomone mediating such behavior is part of N. viridula's cuticular hydrocarbons (CHC) and furthermore that the wasp's ability to discriminate host male and female footprints is mainly based on the presence/absence of nonadecane (nC(19)). In this study, the effect of epicuticular waxes of leaves…
Taxonomic notes on the genera Scatella and Scatophila (Diptera: Ephydridae) with a remark on Trixoscelis chilensis (Trixoscelididae).
2018
Two new combinations are proposed in Scatella for Ephydra australis Walker, 1853 and Opomyza guttata Macquart, 1843. Two species are resurrected from synonymy: Scatella lacustris (Meigen, 1830), revised status and Trixoscelis chilensis (Schiner, 1868), revised status (Trixoscelididae). Nine new synonyms are suggested: Scatella insularis Mathis & Wirth, 1981 = S. australis (Walker, 1853); S. lutosa nigripes Oldenberg, 1923 = S. obsoleta Loew, 1861; S. septempunctata Malloch, 1933 = S. gratiellae Canzoneri & Raffone, 1987 = S. septemfenestrata Lamb, 1912; S. tenuicosta Collin, 1930 = S. lacustris (Meigen, 1830); S. vulgata Cresson, 1931 = S. guttata (Macquart, 1843); Scatophila zlobin…
Distribution et abondance des mouches piqueuses (Glossinidae, Stomoxys et Tabanidae) dans deux parcs nationaux du Gabon.
2015
11 pages; International audience; In order to minimize risks of pathogen transmission with the development of ecotourism in Gabon, a seasonal inventory has been performed in five contrasted biotopes in Ivindo (INP) and Moukalaba-Doudou (MDNP) National Parks. A total of 10,033 hematophagous flies were captured. The Glossinidae, with six different species identified, was the most abundant group and constitutes about 60% of the captured flies compared to the Stomoxys (6 species also identified) and Tabanidae with 28% and 12%, respectively. The Glossinidae showed a higher rate of capture in primary forest and in research camps. In INP, the Stomoxys showed a higher rate of capture in secondary f…
Expression of phase-specific haemolymph polypeptides in a laboratory strain and field catches of Schistocerca gregaria.
2003
Uvarov's theory of locust phase polymorphism implies a differential phase-specific gene expression. It was the goal of the present investigation to provide data on the molecular level for this concept. We used the technique of 2D gel electrophoresis to generate haemolymph polypeptide maps from mature locust males. Under the given conditions we identified 238 polypeptide spots by their molecular weight and isoelectrical point. Isolated and crowded males from the Mainz strain, all originating from crowded ancesters, differed in 20 spots: three were solitary-specific and 17 crowded-specific. Field catches of solitary and gregarious S. gregaria in Mauritania revealed that those males showed the…
Zooplankton assemblages in a Mediterranean restored area: patterns and processes of colonization and establishment
2016
Las charcas son sistemas excepcionalmente ricos en términos de biodiversidad, facilitan la conexión entre diferentes tipos de masas de agua y proveen de un gran número de servicios ecosistémicos como la posibilidad de investigar en torno a ellos. A pesar de su importancia ecológica, este tipo de sistemas acuáticos han sufrido y sufren una fuerte presión antrópica que deriva en numerosas amenazas. En este escenario, ha sido necesario el desarrollo de proyectos que restauren estos sistemas, tratando de recuperar las características ecológicas previas a su degradación. Durante el siglo XX, las charcas costeras mediterráneas sufrieron fuertes presiones, lo que llevó a la desaparición de muchas …
Fenología de los bracónidos (hymenoptera, ichneumonoidea, braconidae) del pirineo andorrano
2006
Phenology of the Braconidae (Hymenoptera, Ichneumonoidea) at Andorra has been conducted/studied using a Malaise trap after a one-year cycle during 1993. A total of 1.892 specimens, representing 23 subfamilies and 79 genera were sampled. About 93.7% of the captures were koinobiont braconids, whereas 6.3% belonged to idiobiont braconids. The annual phenology has been characterized through the correlation between the evolution of the collected braconids and the weather (meteorological conditions). The maximum of the populations were registered between the two rain periods. In fact, the family Braconidae shows an abundance peak from middle of May to end of August, due to the xerothermic conditi…
Tempo and mode of early gene loss in endosymbiotic bacteria from insects
2006
Background Understanding evolutionary processes that drive genome reduction requires determining the tempo (rate) and the mode (size and types of deletions) of gene losses. In this study, we analysed five endosymbiotic genome sequences of the gamma-proteobacteria (three different Buchnera aphidicola strains, Wigglesworthia glossinidia, Blochmannia floridanus) to test if gene loss could be driven by the selective importance of genes. We used a parsimony method to reconstruct a minimal ancestral genome of insect endosymbionts and quantified gene loss along the branches of the phylogenetic tree. To evaluate the selective or functional importance of genes, we used a parameter that measures the …
Mecanismo de activación del receptor de neurotrofinas TrkA
2022
234 págs, figuras y tablas
Mecanismos de resistencia a piretroides en ácaros depredadores
2023
Los piretroides constituyen un grupo de plaguicidas catalogados como moduladores del canal de sodio (Grupo 3), según el comité de acción contra la resistencia a los insecticidas (IRAC). Estos plaguicidas son análogos sintéticos de las piretrinas, compuestos naturales con actividad insecticida que se encuentran en las flores de las plantas del género Chrysanthemum, popularmente conocidas como crisantemos. Actualmente, existen numerosos productos plaguicidas que contienen en su formulación piretroides, siendo ampliamente utilizados en el control de plagas en diferentes contextos como la agricultura, la ganadería, la apicultura e incluso a nivel doméstico, erigiéndose como uno de los grupos de…
Estudio de una superfamilia de genes de respuesta a patógenos (repat) en insectos
2012
El intestino de los insectos es una de las principales vías de entrada de entomopatógenos. Con el fin de minimizar los efectos negativos de los patógenos, el intestino de los insectos posee diferentes mecanismos: síntesis de péptidos antimicrobianos, producción de especies reactivas de oxígeno, activación de los sistemas de reparación y detoxificación, melanización, fagocitosis, apoptosis y la renovación celular, entre otros. Estudios de expresión tras la exposición a diferentes patógenos han mostrado cómo la expresión de ciertos genes varía en el intestino tras la infección. Previamente a la realización de esta tesis, se identificó, en el lepidóptero Spodoptera exigua, una familia de genes…