VOLUM OMAGIAL - Facultatea de Ştiinţe ale Naturii şi Ştiinţe Agricole

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
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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
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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