1,720,962 research outputs found
Aggiornamenti sulla distribuzione di Cucujus cinnaberinus e di altri Cucujoidea (Coleoptera, Nitidulidae, Cucujidae, Laemophloeidae).
No full textOdontosphindus grandis, genere e specie nuovi per la fauna italiana (Coleoptera, Sphindidae)
No full textOdontosphindus grandis, genus and species new to the Italian fauna (Coleoptera, Sphindidae).
The occurrence of Odontosphindus grandis (Hampe, 1861) in I Italy (Latium, C Cimini Mts and Lepini Mts), is reported for the first time in this paper. I It deals with a rare, localized, and presumably relict slime-mould-feeding species. The specimens were collected in beech and mixed oak forests, between 600 and 960 m a.s.l
Diversity patterns of Coleoptera and saproxylic communities in unmanaged forests of Mediterranean mountains
No full textBeetle communities are excellent indicators to monitor biodiversity in forest environments. The most common indicators monitored for assessing the effectiveness of the sustainable forest management measures are deadwood amount, forest structure, and microhabitat traits. In Mediterranean mountain forests, however, the relationships between stand-level attributes and species diversity indicators have been still poorly studied. We have investigated the patterns of species diversity of beetle communities in relation to stand structural traits in two unmanaged forests located in central Apennines (Italy). The two forest stands are characterized by different tree species composition and management history. The experimental area extends over approximately 300 ha, within which 50 circular plots of 530 m2 were sampled for each studied forest. Coleoptera were collected using window flight traps and emergence traps on decaying deadwood. We evaluated i) the differences in species diversity (richness, Shannon diversity and Simpson diversity) between the two forests and ii) the beetle Shannon diversity and composition in relation to selected forest variables, with a particular focus on saproxylic species. Principal Component Analysis followed by rarefaction analysis were applied to examine differences in species diversity. Within each forest stand, a Boosted Regression Tree model and a Non-Metric Multidimensional Scaling were performed to relate the species Shannon diversity and community assemblages to the forest structural attributes. Results revealed how these forest structural attributes have a fundamental role in influencing the diversity of Coleoptera and their assemblages. Forest vertical heterogeneity, snag volume and tree dominance were the most important variables for saproxylic assemblages in these Mediterranean mountain forests, while the amount of coarse woody debris positively affected the overall beetle diversity and that of saproxylic species. At stand level, differences in species diversity were mainly driven by tree composition, probably indicating that food resources, determined by tree species, are of primary importance in determining species assemblages and beetle diversity in these forests; while at plot level, we found that the variables, which drove species composition and beetle diversity, varied between the two forests. This study provides the basis for the integration of independent biodiversity indicators in sustainable solutions for the conservation of unmanaged forests in Mediterranean mountain systems
Modelli di massima entropia per la previsione della distribuzione in Italia di Rosalia alpina L.
No full textOdontosphindus grandis, genere e specie nuovi per la fauna italiana (Coleoptera, Sphindidae).
No full textOdontosphindus grandis, genere e specie nuovi per la fauna italiana (Coleoptera, Cucujoidea, Sphindidae).
No full textPresence of the endangered saproxylic species Cucujus haematodes (Coleoptera: Cucujidae) in Aspromonte National Park (Southern Italy)
No full textThe knowledge of the ecological preferences of threatened species is critical to all conservation programs. Analyses of habitats and ecological parameters of species are necessary to predict future distribution and responses to climate change. Cucujus haematodes Erichson, 1845 (Coleoptera: Cucujidae) is a threatened obligate saproxylic species, listed in the IUCN European Red List of Saproxylic Beetles. After a few decades of apparent absence, the species was recently found in Calabria (Southern Italy) in some good quality biotopes of the Sila National Park in association with Cucujus cinnaberinus (Scopoli, 1763) and Cucujus tulliae Bonacci, Mazzei, Horák & Brandmayr, 2012 (Coleoptera: Cucujidae). Field surveys carried out from 2014 to 2020 in Aspromonte National Park (Calabria) revealed large populations of C. haematodes. Larvae of C. haematodes were collected from under the bark of dead trees in 11 sampling areas within Aspromonte National Park. The presence of larvae of C. haematodes on the non-autochthonous conifer Pseudotsuga menziesii (Mirb.) Franco (Pinales: Pinaceae) was also reported for the first time in Italy
Relationships between stand structural attributes and saproxylic beetle abundance in a Mediterranean broadleaved mixed forest
No full textDeadwood and microhabitats play a fundamental role in many forest ecosystem processes. Deadwood provides the substrate for a multitude of wood-dependent organisms, as well as a variety of microhabitats. Deadwood is a key factor in maintaining the ecosystem functionality and increasing the overall forest biodiversity. In Mediterranean forests, the relationship between stand-structure attributes and species-diversity indicators is still poorly investigated. In this study, we hypothesized that the abundance of saproxylic species was influenced by (i) the composition and amount of deadwood, and (ii) the heterogeneity in types and density of microhabitats. The investigation was carried out in a broadleaved mixed forest located in Central Apennine (Italy), in which silvicultural interventions were interrupted for several decades. The experimental area extends on approximately 240 ha; structural traits, deadwood and microhabitats were sampled on 50 plots of 530 m2. Saproxylic beetles were collected using window flight traps and emergence traps on decaying deadwood. We applied joint species distribution models (JSDM) to quantify the relationship between forest attributes and the abundance of saproxylic species, explicitly including their functional traits (e.g., trophic level). Results demonstrated that microhabitats, living biomass, basal area and coarse woody debris had a significant effect of saproxylic beetles belonging to different trophic categories. Considering the conservation status, only the stand basal area significantly affected the abundance of Near Threatened (NT) saproxylic beetles. This study highlighted the importance of integrating multiple biodiversity indicators to find sustainable solutions for conservation purposes, unlike many studies on conservation-oriented management strategies, more frequently focused on independent forest biodiversity indicators
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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