VOLUM OMAGIAL - Facultatea de Ştiinţe ale Naturii şi Ştiinţe Agricole

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Laura Boicenco / Ovidius University Annals, Biology-Ecology Series 14: 163-169 Cyclotella caspia, in Mamaia Bay. Huge quantities of adult gobies, sole, plaice and turbot juveniles were washed up on the beaches or caught in lethargic condition from the sea by fishermen. As a matter of fact, HALLEGRAFF (1995) considers that species vegetating in densities over 5∙10 6 cells∙l -1 are harmful, since phytoplankton hyperproduction leads to regular violations of the ecosystem carrying capacity and severe economic losses to aquaculture, fisheries and tourism operations [9]. However, some of algal species widely distributed at the Romanian coastal waters, such as Chaetoceros socialis, C. curvisetus, Dichtyocha speculum, Ceratium fusus, can seriously damage fish gills, either mechanically or through production of hemolytic substances. Other ones, such as P. minimum, Dinophysis acuta, D. acuminata, D, sacculus, D. rotundata, M. aeruginosa are considered potentially toxic species, having the capacity to produce potent toxins, like DSP (diarrheic shellfish poisoning), that through the food chain could cause a variety of gastrointestinal illness to humans [9]. The relationship between anthropogenic activities and changes in phytoplankton composition and diversity is one of the main objectives proposed in Harmful Algal Blooms research. Long time series of phytoplankton community storage in the NIMRD data base should be reconsidered related to HAB increase. 5. References [1] BODEANU N., RUTA G., 1998 – Development of the planktonic algae in the Romanian Black Sea sector in 1981- 1996. In Harmful Algae, B. Reguera, J.Blanco, L.Fernandez, T. Wyatt (ed.) Vigo, Spain, 1997: 188-191. [2] OGUZ T., DIPPNER J.W., KAYMAZ Z., 2006 – Climatic regulation of the Black Sea hydro-meteorological and ecological properties at interannual-to-decadal time scale. Journal of Marine Systems, 6: 235- 254. 169 [3] BODEANU N., 1987/1988 - Structure and dynamics of unicellular algal flora in the Romanian littoral of the Black Sea. Cercetari Marine, 20–21: 19–250. [4] MOROZOVA-VODIANITKAIA N.V., 1954 - The Black Sea phytoplankton, Tr. Sevastopol. Biol., 8: 11-99 (in Russian). [5] BSC, 2008. State of the Environment of the Black Sea (2001-2006/7). Edited by Temel Oguz. Publications of the Commission on the Protection of the Black Sea Against Pollution (BSC) 2008-3, Istanbul, Turkey: 23-49. [6] SKOLKA H.V., 1967 – Consideraţii asupra variaţiilor calitative şi cantitative ale fitoplanctonului litoralului românesc al Mării Negre. Ecologie Marină, Vol. 2: 193-293. [7] BODEANU N., ROBAN A., USURELU M., 1981 – Elemente privind structura, dinamica şi producţia fitoplanctonului de la litoralul românesc al Mării Negre în perioada 1972- 1977). Producţia şi productivitatea ecosistemelor acvatice. N. Botnariuc ed., Ed. Acad. Rom., Bucureşti: 42-50. [8] BODEANU N., ANDREI C., BOICENCO L., POPA L.,. SBURLEA A, 2004 – A new trend of the phytoplankton structure and dynamics in the Romanian marine waters. Cercetari Marine, 35: 77-86. [9] VELIKOVA V., MONCHEVA S.,. PETROVA D, 1999 – Phytoplankton dynamics and red tides (1987-1997) in the Bulgarian Black Sea. Wat. Sci. Tech., Vol. 39, No. 8: 27-36.
Ovidius University Annals of Natural Sciences, Biology – Ecology Series Volume 14, 2010 ASPECTS REGARDING THE BIODIVERSITY OF THE AQUATIC AND SEMI AQUATIC HETEROPTERA IN THE LAKES SITUATED IN THE MIDDLE BASIN OF THE OLT RIVER Daniela Minodora ILIE “Lucian Blaga” University, School of Sciences, Departament of Ecology and Environmental Protection, 5-7 Dr. I. Raţiu Street, 550012, Sibiu, Romania __________________________________________________________________________________________ Abstract: The present work analyzes the bio diversity of the aquatic and semi aquatic heteroptera belonging to four habitats, respectively lakes situated within the middle basin of the Olt River. From the collected biological material, consisting of 724 samples there were identified 20 species of aquatic and semi aquatic heteroptera. We want to mention the presence of the species Paracorixa concinna in the lake in Cincşor, here being the single and only one appearance of this species till now in the basin of the Olt River. The different conditions of the researched habitats are to be seen in the structure of the communities of aquatic and semi aquatic heteroptera. The similitude among the established communities is a quite a reduced one. Keywords: aquatic and semi aquatic heteroptera fauna, communities analysis, the middle basin of the Olt __________________________________________________________________________________________ 1. Introduction The aquatic and semi aquatic heteroptera lives in a great variety of habitats, from temporary swamps to big lakes, from brooks to small and big rivers, from continental waters to the surface of the oceans. The aquatic and semi aquatic heteroptera are consumers of the 2 nd degree (the food base consisting of both dead and alive prey). The present work proposes to evaluate the bio diversity of the communities of aquatic and semi aquatic heteroptera from the researched lakes that are situated in the following units of relief: Perşani Mountains, Făgăraş Mountanns and Hârtibaciu Plateau. The lakes are presented as follows: SO1: Bottomless Lake (Mateiaş) The lake is situated in Perşani Mountains, having the following coordinates: 45 0 59’ 08’’ N, 25 0 20’ 20’’ E, at an altitude of 522m. It is to be found on the left slope of the Olt River, being placed in the storages of the terrace allowing in this way the supply of the lake from the phreatic water. The lake, having a surface of approximately 870m 2 is surrounded by willows. Phragmites communis and Typha latifolia covers about 5% from the banks area. The vegetation above and under the water is about 55-60% of the surface of the lake. There are to be found Lemna minor, L. trisulca, Spyrogyra sp., and also Ceratophyllum demersum, Myriophyllum spicatum (a little). It is interesting to be mentioned the appearance in this station of the species Sagittaria latifolia and Potamogeton lucens that are seldom met in the middle basin of the Olt. SO2: Bâlea Lake The geographic coordinates are: 45 0 36’ 10’’ N, 24 0 36’ 49’’E, at an altitude of 2036m. It is a typical glacier lake sheltered in the so called Bâlea bucket, nearby the separating limit between the glacial circle and the former glacial valley. There is a mixed supply, this being the spring of the river Bâlea. The lake has a surface of 4.6 ha and a maximum depth of 11.35. S03: Cincşor The lake is situated in the Hârtibaciu Plateau, having the geographic coordinates as follows: 45 0 49’ 36’’ N, 24 0 49’55’’ E, at an altitude of 422m. It is an abandoned meander of the Olt River, which when there are big flood keeps in touch with the actual course of the river, being situated in its major riverbed. The supply of the lake is both from underground as well as superficial. ISSN-1453-1267 © 2010 Ovidius University Press
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VOLUM OMAGIAL - Facultatea de Ştiinţe ale Naturii şi Ştiinţe Agricole

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