Search results for "Système"

showing 10 items of 558 documents

Social process of adaptation to environmental changes: How eastern african societies intervene between crops and climate

2014

Abstract Studies on climate change can only be conducted on a long time scale, and observing how societies adapt their sowing practices to climate variability is challenging and costly. As an alternative, a space and time substitution design was used, changes in space corresponding to that induced in time by environmental change. On the eastern slope of Mount Kenya, the Tharaka community, originating from the lowlands (750 m), moved up to the midlands (950 m) with their lowland-adapted resources, whereas the Mwimbi, originating from wetter upland (1100 m), moved down to the midlands with their highland-adapted genetic resources. A weather station was installed at 950 and 1100 m, and a logis…

researchProduct

Lobesia botrana larvae develop faster in the presence of parasitoids.

2013

3 pages; International audience; To combat parasitism hosts often rely on their immune system, which is the last line of defense. However, the immune system may not always be effective, and other non-immunological defenses might be favored to reduce the cost of parasite infection. Here we report that larvae of the moth Lobesia botrana can rapidly accelerate their development and reach maturity earlier in response to cues perceived at a distance from parasitoids. Such a phenotypically plastic life history shift, induced by the perception of deadly enemies in the environment, is likely to be an adaptive defensive strategy to prevent parasitoid attack, and has important implications in host-pa…

0106 biological sciencessystème immunitairelcsh:MedicineMothsLobesia botrana01 natural sciencesParasitoidBehavioral Ecology[ SDV.EE.IEO ] Life Sciences [q-bio]/Ecology environment/Symbiosislobesia botranaLife historycroissance des larveslcsh:Science0303 health sciencesLarvaMultidisciplinarybiologyEcologyAnimal BehaviorEcologyAdaptation PhysiologicallarveCommunity EcologyLarvaResearch Article[ SDV.MP.PAR ] Life Sciences [q-bio]/Microbiology and Parasitology/ParasitologyParasitism010603 evolutionary biologyMicrobiology03 medical and health sciencesAnimals[SDV.MP.PAR]Life Sciences [q-bio]/Microbiology and Parasitology/ParasitologyBiology030304 developmental biologyEvolutionary Biology[ SDE.BE ] Environmental Sciences/Biodiversity and Ecologyparasitoïdelcsh:Rfungibiology.organism_classificationSpecies InteractionsEvolutionary Ecologylcsh:QParasitologyAdaptation[SDE.BE]Environmental Sciences/Biodiversity and EcologyZoologyEntomologyintéraction hôte parasite[SDV.EE.IEO]Life Sciences [q-bio]/Ecology environment/Symbiosis

researchProduct

Mesurer les critères et sentiments de justice des acteurs du système éducatif

2003

46e Session de la Conférence Internationale de l'éducation de l'Unesco, Genève, 5-8 septembre 2001 : "La problématique du vivre ensemble dans les curricula"; International audience

Acteur[SHS.EDU]Humanities and Social Sciences/Education[SHS.EDU] Humanities and Social Sciences/EducationJustice socialeMesureSentiment de justiceSystème éducatif

researchProduct

Disparités sociales en éducation en Afrique sub-saharienne : Genre, localisation géographique et revenu du ménage

2006

06017; Dans ce texte, nous poursuivons deux objectifs complémentaires : le premier consiste à offrir une description de l'ampleur des disparités sociales qui existent dans les systèmes éducatifs des pays de l'Afrique au Sud du Sahara principalement dans la période actuelle mais aussi en lui donnant une perspective temporelle; le second cherche à identifier certains des facteurs qui peuvent rendre compte des disparités constatées ou des actions qui ont visé à les réduire.