pp. 129-138

SILVIA BURNAZ, DOREL RUŞTI

86 species of butterflies (S. ord. Rhopalocera, Ord. Lepidoptera) have been recorded from the natural reserves situated in the natural park known as The Geopark of Dinosaurs-Haţeg Country. Besides the well-known sites with reptilian palaeofauna (Upper Cretacic, Maastrichtian) very important natural reserves are included. The lawns of Narcissus from Sălaşu de Sus, The stones of Ohaba de Sub Piatră, The Peat bog of Peşteana and The Forest of Slivuţ (Haţeg) are the most known natural protected areas. If the first third protected areas are known for their floristical interest, The Forest of Slivuţ (Haţeg) is known because of its reserve of European bison (Bison bonasus). Sample and observation on butterflies were accomplished in 2004-2008, each year in April-May and June-September. A checklist of the recorded species is presented. This systematic list is accompanied by data concerning the studied sites and the categories of endangerment according to IUCN criteria. Data about the fly period of the adults, larval and adult food are also presented. Euphydryas aurinia, Maculinea alcon, Maculinea arion, Maculinea teleius, Hyponephele lycaon and Arethusana arethusa are some rare species identified in the area of these natural reserves. These species are listed in the Red List of Butterflies of Romania as vulnerable or endangered species.

EUROPEAN AND EXOTIC INSECT PEST SPECIES IN BRUKENTHAL MUSEUM (SIBIU COUNTY, ROMANIA)

pp. 139-149

IULIANA ANTONIE, IRINA TEODORESC

Investigations on books, woods and textiles pieces in the storage areas of Brukenthal Museum allow the identification of 20 insect pest species, belonging to five orders, ten families and three trophic categories. A total of 13 species were detected on old books, 12 species on ethnographic textile pieces and five species in wood sculpture exhibits. The attacks were detected by alive or dead adults, larvae feeding tubes, nymphal cocoons, exuviae, characteristics of attacked pieces, larvae galleries, adult’s exit holes, faeces, and sawdust. To test the trophic preference (with Lepisma sacharina, Tineolla biselliella and Dermestidae adults) some experiments were made to establish the superior thermic threshold (with T. biselliella). The most noxious pests (Tineolla biselliella, Anobium punctatum and Stegobium paniceum) and the species with the highest attack intensity (Anobium punctatum) were established.

FIRST INVESTIGATIONS OF THE WATER QUALITY OF THE LAKE SREBRNO IN SERBIA BASED ON SAPROBIOLOGICAL ANALYSIS OF BENTHIC FAUNA

pp. 151-165

Vesna MartinoviC-VitanoviC, NataSa PopoviC, SneZana OstojiC, Maja RakoviC, Vladimir KalafatiC

First limnological investigations of the Lake Srebrno water quality were performed in March 2007. Investigations included qualitative, quantitative and saprobiological analysis of bottom fauna communities, physical chemical analysis of sediments and determination of chlorophyll a concentration, as well as trophic status analysis. Samples were collected at eighteen localities distributed along shoreline and profundal of the lake. Twenty taxa from nine macroinvertebrate groups were recorded. The classification of the Lake Srebrno based on trophic and saprobic levels was assessed. The Lake Srebrno as a whole had eutrophic status with the gradation to hypertrophy. Calculated values of Pantle-Buck’s Saprobic Index (S), based on bioindicator organisms of macrozoobenthos, ranged from S = 2.81 to S = 3.60. The water quality was estimated to be within limits proposed to III and IV-III class of the Serbian (Yugoslav) watercourses.

PECULIARITIES OF ECOLOGICAL EVOLUTION OF MUSURA BAY (DANUBE DELTA) BETWEEN 2005-2007

pp. 167-180

ALINA COMAN, CRISTINA SANDU

The ecological evolution of Musura Bay (the Danube Delta) was significantly affected by the hydromorphological changes occurred in the catchment and by the climate change effects. The formation of a sandbank at its mouth, the reduced inflow of marine water and the increasing inflow of the Danube freshwater, lead to a decreasing salinity and a shift of abiotic and biotic parameters from marine to freshwater type. The active siltation together with the increasing water temperatures lead to a marked decreasing trend of water depth, up to an average of 1.4 m recorded between 2005-2007. The annual averages of nutrient and chlorophyll a content were moderate, the assessment of trophic status based on OECD and national criteria indicating a mesotrophic ecosystem. The correlation of chlorophyll a, as a measure of algal biomass, and the abiotic parameters have shown linear correlations with the temperature (p > 0.05, r = 0.291, n = 45) and total phosphorus (p > 0.05, r = 0.284, n = 45). The low amount of organic matter adversely impacted the structural and functional parameters of the benthic community. Based on climate models predictions, severe droughts are expected in the southern part of Romania especially during summer, which will impact even more this aquatic ecosystem, leading to a decrease of the ecosystem services provided to the local community or even to its extinction. Therefore, the local and regional management plans should include potential mitigation measures.