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Foraging behavior related to habitat characteristics in the invasive wasp Vespula germanica

Insect Science 2007年第5期14卷 383-388页

作者： PAOLA D'ADAMO MARIANA LOZADA Laboratorio Ecotono Universidad Nacional del Comahue Bariloche Argentina

When foraging on carrion resources, the wasp Vespula germanica usually makes repeated visits to the feeding site until depleting the resource. In the present study we analyzed how environmental cues affect wasps＇ behavior when re-locating a protein food source. We studied this behavior in two different natural habitats： closed and open habitats. As closed habitats have more references to orient wasps to the feeding site than open habitats, we hypothesized that they would return to the foraging site more frequently in closed habitats than in open ones. We tested this hypothesis by studying wasp behavior in three different natural habitat conditions：（i） closed habitats, （ii） open habitats, and （iii） open habitats artificially modified by adding five sticks with flagging. Experiments consisted of training individual wasps to feed from a certain array, and at the testing phase we removed food and displaced the array by 60 cm. Therefore, we recorded wasps＇ choices when returning to the training area, by counting both the wasps＇ first approaches and the number of visits to the original feeding site and the displaced array. Wasps＇ behavior while re-locating a protein food source was different if foraging at open or closed habitats. Wasps more frequently re- visited a previous feeding location when foraging in closed habitats than when foraging in open ones. Furthermore, wasps more frequently visited the displaced array than the original feeding site in all three treatments. Nevertheless, when wasps were trained in closed habitats, they returned to the original feeding site more frequently than if trained in open ones. Interestingly, when five sticks with flagging were added in open habitats, wasps responded similarly as in closed habitats without these references. The results show that foraging behavior in V. germanica seems to be different in closed and open habitats, probably associated with the existence of references that guide foragers when re-locating undepleted res

关键词： environmental cues food exploitation invasive species re-localization socialwasps Vespidae

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Microenvironment promotes cytoskeleton remodeling and adaptive phenotypic transition

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BIOCELL 2022年第6期46卷 1357-1362页

作者： MARIANO BIZZARRI PAOLA PONTECORVI Department of Experimental Medicine Systems Biology GroupSapienza University of RomeRome00163Italy

The cytoskeleton includes three main classes of networked filaments behaving as a coherent and complex structure that confers stability to cell shape while serving as sensor of internal/extracellular *** stimuli interfere with the non-linear dynamics that govern cytoskeleton architecture,namely by fostering symmetry breakings and transitions across different phenotypic *** process induces a wholecoherent adaptive response,involving the reprogramming of biochemical and gene-expression *** characteristics are especially relevant during development,and in those conditions in which a deregulated crosstalk between cells and the stroma is at the core of the pathological ***,studying how the cytoskeleton can be modified–both pharmacologically and/or through microenvironment-dependent changes–has become a major area of interest in cancer and developmental biology.

关键词： Cell scaffolding environmental cues non-equilibrium thermodynamics phenotypic reversion cell fate commitment

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