Marisia - Maros Megyei Múzeum Évkönyve 32-34. (2014)
Zoology
Svetlana BACAL, Natalia MUNTEANU, Anna MOLDOVAN The aim of our study was to assess the structure of beetles associated with studied crops and adjacent forest strip and to identify the most important pests and in the meantime to indicate the beneficial predators. Material and methods An extensive survey was conducted during 2013 in Sadaclia district Basarabeasca, Republic of Moldova (Latitude: 46° 44’ 91” North, Longitude: 28° 87’ 86” East, Altitude: 74 m) in order to study the distribution, and species diversity of beetles associated with rapeseed crops (Brassica napus L.) and adjacent forest strip. Faunistic material was collected using pitfall traps, every 10 days at each site, during spring and summer time. Beetles were identified using available literature [11]. The classification adopted in the article is by Alonso-Zarazaga, Lyal [1] and Bouchard et al. [6]. To process the data on collected materials, different ecological parameters have been used: abundance, dominance, constancy and value of the ecological significance [9]. Sample based rarefaction of the community was considered using the statistic software Biodiversity Pro version 2 [7]. Voucher specimens were deposited in the collection of the Entomological Museum, Institute of Zoology of the Academy of Sciences of Moldova. Results and discussions A total of299 and 202 beetle individuals were collected from rapeseed field and adjacent forest strip, respectively. Altogether 53 species belonging to 31 genera and 13 families were found; 40 species were identified from rapeseed and 37 from forest strip. Of the total revealed species 24 were common for both ecosystems, 16 species were collected only from rapeseed and other 13 only from adjacent forest strip. The largest family proved to be Carabidae, which includes 14 apecies from 6 genera, followed by Scarabaeidae, with 11 species from 6 genera, Curculionidae with 4 species and 4 genera, Histeridae with 4 species and 3 genera, Tenebrionidae with 3 species and 3 genera, Cerambycidae with 3 species from 1 genus and Chrysomelidae with 2 species and 2 genera. Families Dermestidae, Trogidae and Meloidae had by 2 species from one genus each. Last three families Agirtidae, Coccinellidae and Silphidae were represented by one species each. On the basis of the calculated ecological parameters we can state, that the most abundant and eudominant for rapeseed crop were species: Harpalus distinguendus and Phyllotreta nigripes, this two species being also the most characteristic for this crop. Other 4 species (Opatrum sabulosum, Amara aenea, A. familiaris and Harpalus flavicomis) were subdominant and the rest of species were recedent. In adjacent forest strip the most abundant and eudominant were species Harpalus distinguendus and H. amplicollis, being also characteristic to this ecosystem. As dominant species were noticed Hister quadrimaculatus and Opatrum sabulosum, other 10 species (.Margarinotuspurpurascens, Phyllotreta nigripes, Dorcadionpedestre., Trox hispidus, Aphodius quadrimaculatus, A. distinctus, Onthophagus vitulus, Gonocephalum pusillum, Dermestes laniarius and Valgus hemipterus) were subdominant and the rest were recedent (Table 1). 118
