Search results for "InSe"
showing 10 items of 3069 documents
Large-scale migration synchrony between parasitoids and their host
2015
1. Parasitoids are a valuable group for conservation biological control. In their role as regulators of aphid pests, it is critical that their lifecycle is synchronised with their hosts in both space and time. This is because a synchronised parasitoid community is more likely to strengthen the overall conservation biological control effect, thus damping aphid numbers and preventing potential outbreaks. One component of this host–parasitoid system was examined, that of migration, and the hypothesis that peak summer parasitoid and host migrations are synchronised in time was tested. 2. Sitobion avenae Fabricius and six associated parasitoids were sampled from 1976 to 2013 using 12.2-m suction…
Ecology of the aphid pests of protected pepper crops and their parasitoids
2011
Abstract Myzus persicae, Macrosiphum euphorbiae, Aphis gossypii and Aulacorthum solani (Homoptera: Aphididae) are principal pests of protected pepper crops in southeastern Spain. Our goal was to determine the incidence of aphids on pepper crops and the role of vegetation surrounding greenhouses as a source of aphids and their parasitoids. The population dynamics were followed in six commercial greenhouses during 3 years. Another 82 greenhouses and their surrounding vegetation were surveyed occasionally. Myzus persicae had the highest incidence in pepper greenhouses followed by M. euphorbiae and A. solani. Parasitism of all aphid species in greenhouses was low, Aphidius matricariae and Aphid…
Description ofPauesia (Pauesia)anatolica (Hymenoptera: Braconidae, Aphidiinae) sp. nov., a parasitoid of the cedar aphidCinara cedri
2005
The first parasitoid species reared from a population of the cedar aphid,Cinara cedri Mimeur, 1935 (Hemiptera: Aphididae), from the peninsula of Anatolia in Turkey is described.Pauesia anatolica (Hymenoptera: Braconidae, Aphidiinae) is closely related to some species of thelaricis group ofPauesia from which it differs in the number of antenomers, the propodeum and features of the female genitalia. Its potential use as a natural enemy in areas where the aphid has been introduced is discussed.
Qualitative Analysis of Aphid and Primary Parasitoid Trophic Relations of Genus <I>Alloxysta</I> (Hymenoptera: Cynipoidea: Figitidae: Cha…
2014
Charipinae hyperparasitoids affect effectiveness of the primary parasitoids of aphids by decreasing their abundance and modifying their behavior. As a result, increase of aphid populations can cause severe yield losses in some crops. Therefore, ecological studies on the subfamily Charipinae have a great economical and biological importance. Host specificity of these hyperparasitoids is still under debate and for many Charipinae species very little is known about their trophic relations. Here, we give a comprehensive overview of the trophic relationships between the Charipinae species of the genus Alloxysta Forster and their aphid and primary parasitoids hosts, worldwide. Within this subfami…
Change in take-off elevation angle after limb autotomy mitigates the reduction in jumping distance in rice grasshoppersOxya yezoensis
2013
Autotomy is the ability to spontaneously self-amputate a limb or other appendage, often as a reflexive action. This limb amputation typically occurs as a specialized defensive response to an attack from a predator and thereby enables the prey to escape from predation. Despite the benefits of escape, autotomized organisms lose the body part and its associated function. Here, we investigated the jumping behavior and performance of one-leg-autotomized and intact rice grasshoppers, Oxya yezoensis, to examine changes in jumping behavior after autotomy. The take-off elevation of autotomized grasshoppers was 7.8° lower than in intact grasshoppers, resulting in nearly a 45° angle of take-off, which…
Les procédures d'orientation dans le système scolaire et leurs implications dans la compréhension des relations entre la formation et l'emploi
1981
International audience; Le texte ci-après cherche à explorer en quoi les procédures d'orientation qui sont fondamentales dans la constitution de la segmentation de la population scolaire sont importantes pour la compréhension des phénomènes d'orientation. Il comprend trois parties. La première propose une réflexion d'ordre théorique sur l'orientation au niveau de la classe de 3ème et tente de poser des questions objectives, ayant un contenu empirique opératoire. La seconde partie donne des éléments empiriques sur l'orientation à la fin de La c lasse de 3ème. L'ensemble des questions posées dans la première partie aurait dû y trouver une réponse. Toutefois, des raisons techniques ont retardé…
Le procédures d'orientation dans le système scolaire et leurs implications dans la compréhension des relations entre la formation et l'emploi - 3ème …
1981
International audience
L'insertion professionnelle des apprentis en Bourgogne
1981
International audience; Présentation générale de l'apprentissage et présentation d'une enquête sur deux promotions d'apprentis sorties, l'une en 1976, l'autre en 1978, des Centres de Formation d'Apprentis de Bourgogne. Analyse des caractéristiques démographiques et scolaires de la population étudiée. Analyse de l'insertion professionnelle des apprentis trois mois après le C.A.P., puis analyse statistique comparée de la pénétration sur le marché du travail. Constatation de la proximité entre la spécialité de la formation et celle de l'emploi.
L'insertion professionnelle des jeunes apprentis en Champagne-Ardenne en 1979
1983
Référence interne : 83006; Dans une première partie, nous nous proposons d'examiner la place relative de l'apprentissage en Champagne-Ardenne et en France, d'une part à travers l'évolution des effectifs sur plusieurs années ; et d'autre part, à travers son importance au sein de la population scolaire et la population active. Une deuxième partie décrit les principales caractéristiques de la population interrogée : de façon à approcher au mieux cette population, nous nous sommes appuyés sur les effectifs en année terminale de formation, aussi souvent que possible. Une troisième partie tente de dégager quelques données relatives à l'insertion professionnelle en 1979.
Insertion professionnelle des apprentis en Bourgogne
1984
référence interne : 84040