1,721,002 research outputs found
Difesa del melo più sostenibile nonostante le emergenze
No full textLa difesa fitosanitaria del melo negli ultimi anni si è trovata ad affrontare nuove sfide a seguito degli effetti dei cambiamenti climatici, che hanno favorito modifiche del ciclo biologico di specie già presenti e l’introduzione di organismi alieni, e delle limitazioni normative che hanno imposto strategie a più basso impatto non sempre però sufficienti a gestire le diverse avversita
La Cimice asiatica (Halyomorpha halys), nuovo parassita in continua espansione: aggiornamento su normativa, ricerca e sperimentazione
Full text linkUno studio sui parassitoidi di Halyomorpha halys per lo sviluppo di strategie di controllo biologico in Trentino, Italia
Full text linkAnalisi di pricing di un fondo di mutualizzazione per la gestione del rischio danni da infestazioni parassitarie di cimice asiatica in provincia di Trento
No full textThree-year monitoring of potential insect vectors of “flavescence dorée” in Trentino vineyards through use of chromotropic traps
Full text linkLotta biologica alla cimice asiatica: azione ed interazioni tra antagonisti esotici ed autoctoni
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Disentangling patch and landscape constraints of nested assemblages
No full text2014AbstractThe role of the matrix for the functionality of residual patches and therefore for species persistence has been recentlyrecognised. However its influence on assemblage structure and composition is still unclear. We studied the effect of both patchand matrix attributes on community assemblage structure and composition in a fragmented landscape of central Italy. We usedbird assemblages as a study model. Birds were sampled in 24 wood patches and distribution patterns were analysed consideringboth assemblage and guild-level responses. Patch composition and structure together with landscape patterns quantified with GISwere used as explanatory variables. The assemblages appeared to be strongly influenced by the landscape context, both in terms ofcomposition and configuration. The functional connectivity of the patches, in terms of amount of neighbouring borders betweenwoods and hedgerows, the shape of the woods in the matrix, together with the age of the patches, expressed as tree diameter,acted as the essential determinants, and even if the assemblages presented a significant nested structure, seven out of 40 speciesshowed an idiosyncratic distribution. The study of the association between functional guilds and environmental parametershighlighted the influence of ecological constraints on the occurrence of unexpected presences and absences, suggesting theability of some species to perceive and exploit matrix habitats. The matrix holds the capability to at least mitigate the effects ofisolation and habitat loss, and the semi-natural elements of the mosaic may represent a biodiversity reservoir in an otherwisedeprived landscape
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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