1,721,014 research outputs found
Ant species noxious to cork oak in Sardinia
No full textDuring the biennium 2009-2010, a survey on the pest status of some ant species was
conducted in some cork-oak stands of the North of Sardinia. In the first year, 5 species of arboricolous
ants were collected by direct sampling from a number of trees randomly chosen. Although they are not
very common species, workers of Camponotus fallax (Nylander, 1856) and Camponotus truncatus
(Spinola, 1808) were collected inside little twigs and in other refuges. Crematogaster scutellaris
(Olivier, 1792) was the most common species as its presence was detected in every tree. Camponotus
vagus (Scopoli, 1763) was observed primarily in old trees and in rotten wood among roots and its pest
status has not been seen yet as it rarely builds its nest in productive trees. Serious damages caused by
Lasius brunneus (Latreille, 1798) were observed on cork bark of young plants. The ant activity
degrades cork, diminishing its market value and makes the extraction of the cork very difficult. As a
consequence, in the second year the survey of ant fauna was replicated in the same site by using also
pitfall traps and carried out in three other plots. The infestation percentage caused by L. brunneus was
estimated as well as the damage on each plant
Monitoring of pest and beneficial insect populations in a summer sown cultivation of Bt maize
No full textOsservazioni sulla distribuzione spaziale di ovideposizioni e nidi di Malacosoma neustrium (L.) in sugherete della Sardegna
No full textFrequency distribution of Malacosoma neustrium (L.) egg masses and nests in cork oak forests
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Indagini sull’entomofauna dannosa in un comprensorio cerasicolo montano della Sardegna centrale e tecniche alternative di lotta a Rhagoletis cerasi (L.)
No full textA multidiversity approach to investigate the impact of mining exploitation on spider diversity in the abandoned mine district of Montevecchio-Ingurtosu (Sardinia, Italy)
No full textThe impact of mining activities on spider (Araneae) diversity and assemblages was studied in two abandoned mine sites in Sardinia (Italy), where mining activities started in the middle of the nineteenth century and closed down over a century later. Spider community composition was analysed in dumps, undisturbed forests and scrublands which represent the natural chronosequence following the abandonment of the mining district. The identification of spiders was performed at the lowest taxonomic level possible and differences in abundance, species richness (SR), and functional diversity (FD) were analysed. Nonmetric multidimensional scaling (NMDS) and a permutated multivariate analysis of variance (PERMANOVA) routine were conducted to evaluate the relationships of spider assemblages with land cover, and the indicator species analysis was performed to identify the typifying species. During the entire sampling period, 2312 spiders were captured, and approximately 80% of the total were identified at the species level (79 spider species belonging to 28 different families). No differences in abundance and SR were found, whereas FD, which showed the highest values in forests, significantly differed among sites. A distinct separation among assemblages and a significant effect of the land use on spider assemblages were found (PERMANOVA, R2 = 0.59, p < 0.001). Twelve species were selected as indicator species. Our results underlined the possibility to consider ground-dwelling spiders as a valuable target group for biomonitoring programmes supporting projects of near-natural restoration and/or technical reclamation of mining sites
Analisi di alcuni fattori influenzanti le catture di zanzare adulte per mezzo di trappole a ghiaccio secco tipo CDC
No full textOsservazioni sullo sviluppo e il comportamento delle larve di Malacosoma neustrium (L.) (Lep. Lasiocampidae)
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