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handle: 10261/79772
[IT] La composizione e i ritmi stagionali di imenotteri sinfili, in una foresta acidofila mista in Artikutza (Navarra, Spagna), sono stati oggetto di uno studio basato su campionamenti per mezzo di sei trappole Malaise che hanno operato in maniera continua perdue cicli stagionali. La raccolta di esemplari ha permesso di collezionare individui appartenenti a 43 specie, delle quali più della metà rappresentate solo da individui di sesso femminile. La raccolta di un elevato numero di specie legate ad alberi, arbusti e piante erbacee, in particolare a essenze presenti nelle siepi, riflette l'influsso delle radure nella composizione della raccolta. Un anno di campionamenti non è stato sufficiente per registrare tutte le specie, dato che due o tre trappole sono necessarie per raccogliere 50-75% delle specie, rispettivamente in ogni ciclo. La fine di Maggio e l'inizio di Luglio sono slat) i due periodi di maggiore ricchezza ed abbondanza di specie, con una proporzione maggiore di specie univoltine nel primo periodo e di specie polivoltine nel secondo
[EN] Sawfly composition and seasonal rhythms in an acidofilous mixed forest were studied in Artikutza (Navarra, Spain) by means of six Malaise traps operating continously during two seasonal cycles. The species assemblage consisted in 43 species of which more than half were represented only by females. Recording of as many species related to trees and shrubs as to herbs, particularly edge plants, reflect the influence of glades in the assemblage composition. One year of sampling was not enough to record all species, two to three traps are needed to record 50-75% of species respectively in each cycle. Late May and early July were the two periods of greater species richness and abundance with a great proportion of univoltine species in the former and polivoltine species in the second one
This study was funded by the Department of Education, University and Research of the Basque Government. J.L. Nieves-Aldrey was partially funded from DGES (PGC, PB97-1241)
14 paginas, 4 figuras y 4 tables
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