Search results for "carabid"
showing 10 items of 34 documents
Impatto dei predatori lungo un gradiente forestale di urbanizzazione in Danimarca
2010
Lungo un gradiente di urbanizzazione che va dalla foresta, dominata da Fagus selvatica, ai frammenti della foresta originale nel parco urbano di Sorø a sud della Danimarca (Isola Zelanda), i coleotteri carabidi non dimostrano un decremento nella loro diversità generale, ma le specie che hanno una preferenza nei confronti della foresta diminuiscono (Magura & al. 2010, Global Ecol. Biogegoraphy). Cercando una spiegazione per quest’anomalia, si sono analizzati i tassi di predazione e competizione nei differenti habitat a diversi livelli di urbanizzazione. A tal fine è stato utilizzato un metodo innovativo (Howe & al. 2009, Entomol. Exp. Appl.), che consiste nella disposizione di larve artifici…
Effets de la variabilité inter-individuelles et des interactions intra-guildes sur les stratégies d'approvisionnement de carabes consommateurs de gra…
2017
Making a choice requires, implicitly, an investment of time in one behaviour at the expense of an investment in another. Being choosy would increase the risk of losing many food item opportunities to competitors, and is directly in conflict with other essential tasks such as predator avoidance. Individuals are thus expected to adjust their level of choosiness in response to the competition and predation context. The available behavioural ecological theory and the empirical ecology of carabids would suggest that competition and predation interference induces changes in the foraging behaviour of carabid individuals. Carabids typically operate within communities in which competition and predat…
Influence du colza et des prairies à différentes échelles spatiales sur l’abondance des carabes prédateurs de graines d’adventices
2014
National audience; Les coléoptères carabidae sont très représentés dans les cultures annuelles où ils peuvent contribuer au contrôle biologique de bioagresseurs. Ainsi, les carabes omnivores et granivores consomment des quantités importantes de graines de plantes adventices. Des études récentes suggèrent que la réponse des communautés de carabes à l’organisation du paysage est en partie dépendante de leur guilde trophique. Néanmoins, dans le cas de carabes consommateurs de graines d’adventices, on connait peu les types d’occupation du sol qui les favorisent au sein d’un paysage et l’échelle spatiale à laquelle ces insectes répondent. Ici, nous avons analysé les variations de l’abondance de …
Hybridization, developmental stability, and functionality of morphological traits in the ground beetle Carabus solieri (Coleoptera, Carabidae).
2006
Correspondance.: stephane.garnier@u-bourgogne.fr; International audience; The assessment of developmental stability in hybrids can provide valuable information in the study of species formation because it allows an evaluation of the degree of incompatibility of genetic systems that control developmental processes. The present study assessed the impact of two hybridization events, assumed to have occurred at different times, on developmental instability in the ground beetle Carabus solieri . Developmental instability was estimated in 678 individuals from 27 populations from the fluctuating asymmetry (FA) levels of four morphological traits: the tibia length of middle and hind legs, which are…
Quantification of the contribution of weed seed predators to crop yield
2023
30 book of abstracts; International audience
Effects of undergrowth removal and edge proximity on ground beetles and vascular plants in urban boreal forests
2019
Urban forests are regularly managed for human safety and esthetic reasons, but they are crucial habitat for many species. Removals of undergrowth occur commonly in these forests, yet the ecological consequences of these operations are poorly understood. We sampled ground beetles (Coleoptera, Carabidae) and vascular plants along 20-m edge gradients in Finnish urban forests, in five stands treated 0.5–2.5 years earlier with undergrowth removal and in five untreated stands. We hypothesized that undergrowth removal and edge proximity would benefit opportunistic and open-habitat species, whereas shady-habitat species would be affected negatively. (1) Regarding carabids, diversity and evenness in…
Un état des connaissances sur la prédation des graines adventices par les invertébrés
2013
Adopting agro-ecological management in farming systems requires a good knowledge of the different organisms that interact within the agorecosystem. Research on weed seed predation by invertebrates (Coleoptera, Adephaga, Carabidae) is booming. Here, we present an overview of current available knowledge on this ecosystem service and factors that may be important to enhance it.
Ecological response hides behind the species abundance distribution : Community response to low-intensity disturbance in managed grasslands
2017
Land-use and management are disturbance factors that have diverse effects on community composition and structure. In traditional rural grasslands, such as meadows and pastures, low-intensity management is maintained to enhance biodiversity. Maintenance of road verges, in turn, creates habitat, which may complement traditional rural grasslands. To evaluate the effect of low-intensity disturbance on insect communities, we characterized species abundance distributions (SAD) for Carabidae, Formicidae, and Heteroptera in three grassland types, which differed in management: meadows, pastures, and road verges. The shape of SAD was estimated with three parameters: abundance decay rate, dominance, a…
New taxa of Orthoptera (Insecta Tettigoniidae Phaneropterinae) from Madagascar.
2017
The author reports the results of a study on Orthoptera collected in Madagascar and preserved in two European Natural History museums. He describes Symmetroraggea depravata n. sp., Parapyrrhicia longipodex n. sp., Madagascarantia bartolozzii n. gen. n. sp., Mimoscudderia spinicercata n. sp. In addition, he lists new records or unknown taxonomical characters of Xenodus nobilis Carl, 1914 and Parapyrrhicia virilis Carl, 1914.
Characterization of trophic links in an agrosystem : weed seed predation by carabid beetles
2012
Agroecology gives evidence of new perspectives in agriculture, and open doors for alternative weed management approaches through different regulation mechanisms. Seed predation is one of them, and the interest is growing to deepen knowledge, relative to this process. This Phd work aims (i) to describe weed seed predation, the dominant carabid predators and the available resource at a local scale in a common crop (winter wheat); (ii) to study predation profiles of main predators, and the pair-wise correlations between the biological components of the system; (iii) to bring new insights regarding potential regulation of weed communities, through seed predation by carabid beetles. Complementar…