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Maletin Stevan

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University of Szeged

LIMNODRILUS HOFFMEISTERI CLAPAREDE, 1862 AS A DOMINANT SPECIES IN THE TISA DEAD-ARM (CURUG—BISERNO OSTRVO) OLIGOCHAETA COMMUNITY NADA , DjuKié and S. MALETÍN Institut of Biology, Faculty of Sciences, Novi Sad, Yugoslavia (Received December 10, 1988) Abstract In the 1983—1988 period 11 oligochaeta have been found in the Mrtva Tisa Oligochaeta com-munity f rom Naididae and Tubificidae family. Limnodrilus hoffmeisteri has been a dominant species in all the samples. The relative abundance, expressed as the percentage of this species has shown an increasing tendency up to 67%. The increase in the percentage of this species is closely related to the increase in the Oligochaeta dynamics of abundance. This in durn, leads to changes in the Oli gochaeta community structure. Introduction The fauna studies of the Mrtva Tisa bottom are of recent date (initiated in 1983). Oligochaeta community as an eutrophication indicator in the Mrtva Tisa has been studied by DuKió 1987 in the period from 1983 to 1987. Within this short period, it has been found that L. hoffmeisteri species relative abundance is constantly reflec-ted by the increasing tendency. Many research workers have been involved in the studies of L. hoffmeisteri species. According to BRINKHURST 1969, this species is present in fresh waters of variable quality and its progressive domination in the benthic community is closely related to the organic pollution level. PODUBNAJA (1972) , however, in her research work has demonstrated that this species is widely spread, inhabiting waters polluted with different types of pollutants. L. hoffmeisteri and L. udekemianus species development cycle and production in the organic matter reach mudd has been studied by LAZIM a n d LEARNER 1986. These authors have come to a conclusion that L. hoffmeisteri had the highest relative abundance within the total Tubificidae production. For these reason have we decided to conduct a more detailed study of this species, which dominates in the Mrtva Tisa. 43 Materials and Methods The fauna samples of the Mrtva Tisa bottom have been collected according to seasons, in the 1983—1988 period. The mudd has been collected by "Ekman Birge" type dredging machine. The collected material has been prepared in the laboratory by standard method. Determination has been carried out on live Oligochaeta specimen. The number of individuals is presented as a total number of individuals per m2 of the surveyed area. The correlation is calculated on the basis of the total number of Oligochaeta individuals and those of L. hoffmesiteri species. Results and Discussion In the qualitative studies of the Oligochaeta community of the Mrtva Tisa bottom fauna, 11 Oligochaeta species of six genera and two families, Naididae and Tubificidae have been found, as follows : Dero digitata, D. obtusa, Stylaria lacustris, Limnodrilus, sp. L. hoffmeìsterì, L. claparedeanus, L, udekemianus, L, helveticus, 44. .E? Б "§4000-¿200C-σ QJ α ο 8000 6000-0 ο - . r= Q9932 ys 1.4665 χ »3 99,6847 ψ 9065 0 5001000 2000 J J ! * ìnd./m' 4000 6000 Limnodrilus hoffmeisteri Fig. 1. Correlation of Oligochaeta total number and number of Limnodrilus hoffmeisteri Psamoryctides barbatus, P. albicola, Potamothrix hammoniensis and Tubifex tubifex. L. hoffmeisteri has been a dominant species in all the samples in the 1983—1988 period. This is confirmed by the relative abundance, as shown in Fig. 1. The mean percentage of this species has been increased from 22% in 1983, to 67% in 1988. The Mrtva Tisa mudd is of a soft, consistent state, black color, with ample detritus of the plant and animal origin, rich in organic matter, and highly suitable for the observed species development. Similar results have been obtained by LAZIM and LEARNER, 1986. In the organic enriched fine sediment, L. hoffmeisteri species had the largest percentage in the total Tubificidae production. Research work carried out by BRINKHURST 1969, LANG 1984, MILBRINK 1980. , and others state a large number of this species in the organic matter rich mudd. Because of that, LANG 1 9 8 4 has classified them as eutrophic species. Therefore, this species in the community with Tubificidae defines the Mrtva Tisa environment as eutrophic. The quantitative analysis contributes to this fact, 80 • 6 0 -4 0 -2 0 -0 . _ Fig. 2. Participatin percent of Limnodrilus hoffmeisteri individual in Oligochaeta total number с и I— aj CL " 8 3 ".84 " 8 5 " 8 6 " 8 7 " 8 8 • y e a r s 45 showing a striking increase in: the number of Oligochaeta individuals, up to 9Ö66 ind/m2 in 1988. This is also characteristic of eutrophic waters. : The calculated relation between the total number of Oligochaeta individuals and those of L. hoffmeisteri reveals a close correlation between these two parameters. This is also supported by the correlation coefficient significance (Fig. 2), thus L. hoffmeisteri species contributes the most to an increase in the Mrtva Tisa abun-dance dynamics. It has suceeded in adjusting to the conditions of the organic matter rich sediment, multiplying plentifully and thus disturbing the Oligochaeta commu-nity structure ratio in this stagnant tributary. Conclusion ι In the 1983—1988 period 11 Oligochaeta species have been defined in the Mrtva Tisa Oligochaeta community, from six genera and two families : Naididae and Tubi-ficidae. Limnodrilus hoffmeisteri has been a dominant species in all the samples. The relative abundance expressed as the percentage of species has shown an increasing tendency, even up to 67%. The correlation between the total number of Oligochaeta individuals and those of L. hoffmeisteri species has been very narrow (the correlation coefficient г=0,9932), meaning that L. hoffmeisteri is a major cause for àn increase in the abundance dynamics of Oligochaeta in the Mrtva Tisa. It has been well adjusted to the conditions of an organic matter rich sediment, it has also multiplied abundantly, disturbing the Oligochaeta community structure in this stagnant tributary. References / BRINKHÜRST, R. O. (1969): The fauna of pollution, in: The Great Lakes as en enviroment, "Gt. Lakes" Inst. Univ. Toronto, P. R. 39. DuKié, N. (1987): Eutrophication of the Dead Theiss indicated by oligochaete. — Tiscia (Szeged) 1988 (in press). LANG, C. (1984) : Eutrophication of Lakes Léman and Neuchatel (Switzerland) indicated by oligochae-te communities.— Hydrobiologia 115, 131—138. LAZIM, M., N. LEARNER, M. A. (1986): The life-cycle and production of Limnodrilus hoffmesiteri and L. udekemianus (Tubificidae, Oligochaeta) in the organically enriched Moat-Feeder Stream, Cardiff, Sourh Wales. Arch. Hydrobiol./Suppl. 74, 200—225. MILBRINK, G. (1980): Oligochaeta communities in pollution biology the european situation with special reference to lakes in Scandinavia. In R. O. Brinkhurst and D. G. Cook (eds.) Aquatic oligochaeta biology. — Plenum Press. N. Y. London: 433—455. PODDUBNAYA, T. L. (1980): Life cycle of mass species of Tubificidae (Oligochaeat). In R. O. Brink-hurst and D. G. Cook (eds.). Aquatic oligochaeta biology. — Plenum Press. N. Y. Lo.idon, 175—184. 46 A Holt-Tisza (Curug—Biserno Östrvo) Oligochaeta közösségének dinamikája DJUKIÉ NADA é s MALETIN S . Biológiai Intézet, Novi Sad, Yugoslavia Kivonat A Holt-Tisza komplex hidrobiológiái kutatásainak szerves tartozéka az Oligochaeták vizs-gálata is. Megállapítást nyert hogy az 1983—1985-ös időszakban strukturális változás állt be az Oligochaeta közösség összetételében. Mennyiségi analízis tekintetében a domináns Limnodrilus hoffmeisteri relatív abundaciája évről évre növekedett. Az oligochaeták mennyiségi gyarapodásán belül a L. hoffmeisteri feldúsult részesedése szoros korrektív kapcsolatban áll, a szerves megterhelés következtében, a holtágra jellemző felgyorsított eutrofizációs folyamattal. Динамика сообщества Oligochaeta в Мертвой Тисе (Чуруг — Бисерно Острво) Н. Д ь ю к и ч и С. М а л е т и н Биологический институт, Новый Сад Резюме Изучение Oligohaeta является органической частью комплексного гидробиологического исследования Мертвой Тисы. Было установлено, что в период 1983—85 гг. в составе сооб-щества Oligohaeta произошли структурные изменения. В результате количественного анализа обнаружено увеличение из года в год относительного избытка доминантного вида Limnodrilus hoffmeisteri. В рамках количественного увеличения Oligohaeta, относительное преобладание L. hoffmeisteri находится в тесной корреляции с характерным для мертвого русла ускорен-ным процессом эутрофизации вследствие его органической нагрузки. Limnodrilus hoffmeisteri claparede, 1862 kao dominantna vrsta u zajednici Oligochaeta u mrtvoj Tisi (Curug—Biserno Ostrvo) NADA DJUKIC i S . MALETÍN Institut za biologiju, PMF, Novi Sad, Jugoslavia Abstrakt U periodu od 1983—1988 godine u oligohetnoj zajednici Mrtva Tisa je konstatovano 11 vrsta oligoheta iz familije Naididae i Tubificidae. U svim uzorcima je dominirala vrsta Limnodrilus hoffmeis-teri. Relativna abundantnost, prikazana preko procentualne zastupljenosti ove vrste pokazuje tendenciju njenog porasta i do 67%. Procentualno povecanje zastupljenosti ove vrste je u uskoj korelaciji sa poveéanjem dinamike brojnosti oligoheta, a to dovodi do promena u struktur! oligohetne zajednice. 47 

Limnodrilus hoffmeisteri claparede, 1862 as a dominant species in the Tisa dead-arm (Čurug-Biserno Ostrvo) Oligochaeta community

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Limnodrilus hoffmeisteri claparede, 1862 as a dominant species in the Tisa dead-arm (Čurug-Biserno Ostrvo) Oligochaeta community

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