Content of the Volume 22.
Dobler, E.: Seasonal changes of phytoplankton in the backwater Bokros.
Simic, S. and Vujic, A.: The syrphid fauna (Diptera) of the Tisza basin in Yugoslavia.
Dobler, E. (1987): Seasonal changes of phytoplankton in the backwater Bokros. – Tiscia 22, 3-12.
Abstract. The backwater at Bokros is one of the sampling territories of the Tisza Research Board. It can be found in the 251. river-kilometer segmem of the Tisza river on the saved (right) side.
Relying on the investigations of 1984 the author determined the seasonal changes occurring in the examined water territory based upon the composition of species and on the quantity of populations. The result of the analysis of monthly taken water samples was illustrated expressed in per cents of the prevailing total organism number (Cyanophyta, Diatomae, Chlorophyta and others). She assessed the seasonal changes of biomass calculated from the volume of alga characteristic of the water territory of the backwater as well.
Applying the theory of diversity the author tried to find an answer to the question: Which organisms are responsible for the small values of diversity? Evaluating this she made use of a new method (DIVDROP) as well. She supplemented her investigations with data of relative chlorophyll contents of the phytoplankton biomass.
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Szalma, E. and Lévai, O. (1987): Seasonal dynamics and structural changes in the cenoses belonging to the Phragmitetea association class at lake Sulymos. – Tiscia 22, 13-29.
Abstract. Cenological and seasonal dynamic studies were performed in the years 1985-86 at the area of the Kiskunsag National Park at Lake Sulymos running next to the Dead-Tisza at Lakitelek, in respect to the cenoses of marshy (Phragmition) and high sedgy (Magnocaricion) character.
In the initial phase of the Spring aspect, the preponderance of the Phragmition character associations is characteristic to the cenoses occurring in Lake Sulymos. High species diversity is manifested in the littoral zone, while towards the middle of the Lake the diversity shows a decrease and at the same time, there is an increase in the individual number of the species.
Correct interpretation of the seasonal dynamic as well as structural changes is possible based on the classification of the releves. The zonality of the associations growing in the lake is only observable at the littoral zone. The development of the zonation is on the one hand caused by the relief relations of Lake Sulymos, the fluctuation of the water level and the trend of the water depth. On the other hand, it is defined by the ecological demand of the species forming the zonal1y appearing associations, as well as by the competition developing between them.
A succssion series can be set up during the decomposition of the phytomass promoting the advancement of the eutrophication and siltation processes. According to the results the presumed succession series is: Typhetum angustifoliae-Scirpo·Phragmitetum typhetosum-Scirpo·Phragmitetum phragmitetosum-Glycerietum maximae-Caricetum gracilis.
The trend of the succession corresponds to the direction of the shift of the R-characteristic indicator value, it is therefore presumable that the acidity relations within the biotope have determinative significance. Based on the T, W and N-characteristie indicator values, the results of the vegetation dynamic studies can well be interpreted.
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Bagi, I. (1987): Studies on the vegetation dynamics of Nanocyperion communities III. Zonation and succession. – Tiscia 22, 31-45.
Abstract. Using the "degree of succession" (DS) index of Numata, as with the descriptions in Parts I. and II. of this study, the succession types in the upper and lower parts of the Nanocyperion zone can be distinguished. The vegetation of the upper Nanocyperion zone shows a successive relationship with the Bidentetea associations of the higher level, as does the vegetation of the lower zone with the Agropyro-Rumicion associations of the higher flood-plain levels. The transition in the direction of the Agropyro-Rumicion associations is represented by the cyperetosum fusci subassociation of the Rorippo-Agrostietum stoloniferae association, first described in the present paper.
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Bagi, I. (1987): Studies on the vegetation dynamics of Nanocyperion communities IV. Diversity and succession. – Tiscia 22, 47-54.
Abstract. The paper deals with studies on the temporal and spatial changes in the diversity and evenness of the vegetation of the Nanocyperion zone found on the river-bed. A relatively lower diversity is characteristic of the more or less typical associations developing during the course of the succession, while the stands representing transitional cenoses between the associations are characterized by a higher diversity. The increase in diversity of the vegetation on the lower reliefs developing in the direction of the Agropyro·Rumicon is accompanied by an increase in the value of evenness.
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Komendar, V. I. and Fodor, S. S. (1987): Studies on the upper timber line of different forest types in the Carpathians. – Tiscia 22, 55-60.
Kricsfalusi, V. V., Komendar, V. I., Mezô-Kricsfalusi, G. N., Szabados, V. I., Feszenka, Sz. Sz. and Sumszkaja, N. V. (1987): Study of reproduction biology of some rare plant species in the upper Tisza valley. – Tiscia 22, 61-73.
Mandrik, V. J. and Pavlina, E. I. (1987): Morphological properties of some Rosa canina L. populations in the upper Tisza valley. – Tiscia 22, 75-81.
Pujin, V., Ratajac, R., Djukic, N., Svircev, Z. and Kilibarda, P. (1987): Saisonmässige Variationen der Zusammensetzung des Planktons und der Bodenbesiedlung in der Carska Bara (Jugoslawien). – Tiscia 22, 83-91.
Zusammenfassung. Mittels Erforschungen in der Carska bara (Kaisersumpf) im Zeitraum 1982-1985 wurde eine starke Varierung der grundlegenden ökologischen Faktoren: des Wasserstandes, der Temperatur, des pH-Wertes und der Sauerstoffsättigung festgestellt. Diese Varierungen waren von Einfluss auf die Dynamik und der Zusammensetzung des Planktons und der Bodenbesiedlung. Im eingeflührten Zeitraum wurden in der Phytoplankton-, Phytoperiphytonzusammensetzung 103 Arten festgestellt, die zu den Gruppen: Cyanobacteria (Cyanophyta) = 12, Chrysophyta=2, Diatomophyta (Bacillariophyta) = 34, Xantophyta = 2, Pyrrhophyta=2, Euglenophyta = 13 und Chlorphyta = 38 gehörten. In allen untersuchten Jahren wurde die grosste Anzahl von Arten im Frühjahr festgestellt, wahrend der Artenanzahl nach die Jahre 1982 und 1984 eine grössere Ähnlichkeit aufwiesen als die anderen zwei. Mit Ausnahme des Jahres 1982 dominieren in allen Winterperioden Diatomophyta, während in der Sommer und Herbst diesen Platz Chlorophyta und Euglenophyta übernehmen. Das Zooplankton und die Mikrofauna weisen eine grössere Verschiedenheit in der Frühlings- und Sommerperiode, ausnahmsweise in der Herbstperiode (1985) auf. Auch in Bezug auf diese Komponente beobachten wit eine grossere Ahnlichkeit zwischen den Jahren 1982 und 1984. In der Bodenbesiedlung spielen wahrend des gesamten Untersuchungszeitraums die haupt Rolle die Oligochaeten, die mit 14 Arten und einer Dynamik von 44,4 Ind. m-2 bis 5,194 Ind. m-2 sowie einer Biomasse von 0,2 g bis zu 24,558 g. m-2 verteten waren. Die vorherrschende Art war Limnodrilus hoffmeisteri Claparede in allen Untersuchungsjahren, während sich das Vorkommen der übrigen Arten von Jahr zu Jahr ändert.
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Pujin, V. and Maletin, S. (1987): Diet of prussian carp (Carassius auratus gibelio Bloch) in the Carska bara. – Tiscia 22 , 93-98.
Abstract.
Diet of Prussian carp, introduced from the waters of the Far
East was studied on 209 specimen, collected in spring and summer
period of 1984-1985. Analyzed exemplars were 113-248 mm of
standard length, 42-415 g of body mass and 2-5 years of age.
Their diet consisted of both plant and animal components. The
diet contained the following algae: Cyanobacteria, Diatomophyta,
Euglenophyta and Chlorophyta. Parts of makrophyta were also
present. Animal component consisted of Rotatoria, Cladocera,
Copepoda, Oligochaeta, Chironomidae and some other larvae of
insects, not precisely defined. The highest frequency was noted
for Cladocera and Copepoda (100%), followed by Rotatoria (90% in
spring time, 80% in summer time) and Oligochaeta (75%/85%
respectively). Diatomophyta (80/90 %) were the most frequent
among algae. As regards relative abundance these groups would
also play a significant role in Prussian carp diet. However, if
the biomass of aforementioned organisms was taken into
consideration, Oligochaeta, Cladocera and Copepoda had the
highest incidence. Similar results were obtained when other
water ecosystems in Vojvodina were investigated, even though
differences related to food availability were noted.
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Avasi, Z. (1987): Flooad as ecological perturbation of epigeic animal communities II. The effect of flood on ground beetle assemblages (Coleoptera: Carabidae). – Tiscia 22, 99-107.
Abstract.
Author reports on the processing of the material collected by
means of Barber soil-traps at four different habitats at the
flood-plain of the Maros (I. dam-side, II. poplar-forest. III.
willow-forest, IV. littoral scrub-willow plantation) following
the flood of 1982 inundating the whole flood-plain. In the
course of the studies 53 species of 18 genera belonging to the
Carabidae family were collected. Using diversity and similarity
studies, an analysis is given of the dynamism of the Carabidae
populations, their recolonization after the flood, as well as of
the reorganization of the Carabidae communities.
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Tanács, L. (1987): The trend of the composition of thee wild-bee population on anthropogenic effects in the biotopes of the Kisköre storage-tank region at the Tisza-valley. – Tiscia 22, 109-119.
Abstract. Studies were performed along the
middle-Tisza reach, at the region of the Kisköre storage tank in
the years 1976-77 and 1979-80. The area of the storage-tank was
inundated in 1978 by means of damming up the water. Prior to and
after damming up the water, apart from the trend of the
composition and density relations of the wild-bee population,
studies were conducted in respect to the consequences of certain
human impacts. The anthropogenic effects were the damming up of
the water and the inundation of the meadows of the storage-tank
following the building of the dam-system: the partial re-sowing
of the grasslands and newly established dam-system with high
protein-containing lucerne, red clover and five-finger
papilionaceae. The number of recordings was 102, the appreciated
wild-bee material was composed of 3716 individuals.
1. On the effect of damming up the water, a modification was
manifest with the disappearance of the flood-plain in the
species composition of the wild-bee population of the dam sides.
The similarity of the species according to locality was found to
be moderate in the quantitative and qualitative appreciations. A
slight change was manifest in the species diversity and
quantitative relations of the wild-bee populations upon the
effect of damming up the water.
2. The discontinuance of readings has negative influence on the
composition and density of the wild-bee population in the
grassland communities of the fill slope.
3. The re-sowing of the dam sides with papilionaceae is
beneficial to the enrichment of the economically valuable
Andrena, Halictus, Lasioglossum, Eucera, Bombus, Megabombus
and Pyrobombus species.
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Simic, S. and Vujic, A. (1987): The syrphid fauna (Diptera) of the Tisza basin in Yugoslavia. – Tiscia 22, 121-127.
Abstract. The investigations into the syrphid
fauna were conducted along by the Tisa river, in 1984 and 1985.
The number of 91 species was collected, out of which 12
represent new records from the Province of Vojvodina and the 2
species (Posthosyrphus tatilunulatus (COLL.) and
Platycheirus angustatus ZEIT.) are new for Yugoslavia. The
fauna composition is discussed on the basis of plant communities
developed in the Tisa Basin, according to the distribution type,
and according to the mode of larval development.
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Bodrogközy, Gy. (1987): From the life of Tisza-research working committee, which has become international. Tisza-research conference XVII (1986). – Tiscia 22, 129-141.