Oligochaeta of the Morava and Odra River basins (Czech Republic): species distribution and community composition (original) (raw)
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Comparative Study of Oligochaeta Communities on the Somesul Mic River from 1996 to 2000
Annals of West University of Timisoara: Series of Biology, 2003
The present paper represents a comparative study of Oligochaeta communities from the Somesul Mic River. The research lasted four years, from 1996 to 2000. The study focuses on the oligochaeta community structure, its density variations and on the indicative value of some oligochaeta species.
Distribution and diversity of aquatic Oligochaeta in small streams of the middle taiga
Turkish Journal of Zoology
Th e goal of the present study was to describe the fauna, community structure, distribution, diversity, abundance, and ecology of Oligochaeta in small streams of the Komi Republic. Th e work was performed in 13 streams located in the Vychegda River basin during the month of July, 2005-2008. During the study, 48 taxa from 7 families were collected. Th e habitat of each study stream was determined with respect to chemical water composition (Na + , Mg 2+ , Ca 2+ , Cl-, and total phosphorus (P tot), among others) and some environmental factors: bottom structure (hard or soft), water temperature, depth, fl ow velocity, moss or algae cover, etc. Th e species composition, diversity, and determination of the small streams' aquatic Oligochaeta as well as the infl uence of diff erent ecological factors on these characteristics were analyzed and discussed. Th e number of species, their composition, and the average abundance and biomass of Oligochaeta were found to depend upon bottom texture, current velocity, moss or algae cover, water temperature, and changes in the water chemicals (Na + , Mg 2+ , and P tot concentrations), as well as the nitrogen, carbon, and humus contents in the bottom sediments.
Oligochaeta of the Danube River — a faunistical review
Biologia, 2013
The aim of this work is to discuss the distribution of Oligochaeta (Annelida) in the Danube River using the collections made by the Joint Danube Survey 2007 (JDS2) on more than 2800 km of the river. The basic faunistical features of the oligochaete assemblages were analysed with regard to three main sectors of the Danube (upper, middle and lower reaches, the last with the Danube Delta). A total of 52 oligochaete taxa have been recorded. Most of the observed species are typical of the potamon-type rivers in the region, and are well adapted to moderate-to-high organic load. The highest taxa richness and frequency of occurrence were observed among the Tubificidae family. Naididae, Propappidae, Enchytraeidae and Haplotaxidae had also low frequency. The upper reach of the Danube showed the lowest species richness, while the middle reach is characterised by its highest species richness. Construction of dams and regulation of the riverbed have resulted in an increase of limno(rheo)philic taxa which prefer slow-flowing and lentic zones.
Springer eBooks, 2001
In most soft-bottomed, lowland streams in the Netherlands discharge regimes largely follow the precipitation pattern. Winter discharges are higher and much more dynamic then summer discharges, although rain storms throughout the year cause unexpected peak flows. Minimal precipitation, reduced stream flow and droughts can occur during the summer months. Lowland stream habitat, particularly in The Netherlands, is hydrologically dynamic, with substrates frequently moved or disturbed. Differences in discharge patterns in Dutch soft-bottomed lowland streams are expected to affect distribution patterns of macroinvertebrates and thus oligochaetes. Ten small to medium sized lowland streams, differing from one another in hydrological regime, were studied. Five major habitats in each stream were assessed on three occasions over a 15-month period. Each habitat sampled with a micro-macrofauna shovel; during each sampling period, several environmental parameters, especially hydrological and substrate parameters, were measured. Ordination (CANOCO) (Ter Braak, 1989) and statistical tests (chisquared test) (Lindgren & McElrath, 1970) were used to determine the major oligochaete distribution patterns between streams as well as between habitats within each stream. Each stream was characterized by its oligochaete assemblage; general distribution patterns and individual oligochaete-substratum relationships were documented. Hydro-morphological parameters together explained the differences in major distribution patterns. Preferences of oligochaetes for specific structural habitats are discussed.
The oligochaetes from freshwaters of Montenegro were studied in order to improve the recent knowledge about their faunistics and their use as bioindicators of water and sediment quality in aquatic ecosystems. Samples of sediments were taken from 16 rivers, 6 lakes, 3 springs, 3 reservoirs, and 2 creeks, at 78 different sampling sites, during six years of research (2005–2011), from the Black Sea and the Adriatic Sea drainage basins. The oligochaete fauna of Montenegro includes 82 species, from 8 families. Thirty-six of them represent first records for the Montenegrin oligochaete fauna. Both qualitative and quantitative differences were found between the oligochaete fauna of the Black Sea and the Adriatic Sea drainage basins. Sixty-four oligochaete species were found in rivers, 30 species in lakes, 20 species in reservoirs, 14 in creeks, and 9 species in the studied springs. The highest diversity of oligochaete species among studied rivers was found in the Zeta River, among lakes in L...
The effect of drought on Oligochaeta communities in small woodland streams
Oligochaeta communities were studied in four streams inflowing Lękuk Wielki lake and from the outflow of this lake (NE Poland) during 1997-1999. Twenty five taxa of oligochaetes were identified, representing aquatic (Tubificidae, Lumbriculidae), semi-aquatic (some Enchytraeidae and Lumbricidae) and soil (Lumbricidae, some Enchytraeidae) families. The occurrence of Naididae was limited to the outflow of the lake. After a drought period the densities of oligochaetes were the highest, diminishing during the permanent flow period. The composition of the oligochaete fauna in the studied small, drying streams depends on fauna composition in the lake and surrounding soil as well as the inflow from shallow subterranean waters, therefore species with different ecological requirements appear simultaneously.
Micro-distribution of oligochaetes in a soft-bottomed lowland stream (Elsbeek; The Netherlands)
Aquatic Oligochaetes, 1999
This study focuses on a low-gradient, soft-bottomed stream which shows strong fluctuations in discharge, partly natural (i.e. due to rainfall) and partly due to agricultural land-use. This dynamic discharge pattern causes silt deposition between discharge peaks which in turn cause the silt to be washed out. This process occurs independently from the height of the peak. The main substrate in the stream is quite homogeneous fine sand. Twenty-three species of oligochaetes were found. Their distribution and abundance varied with season and substrate. Mature tubificids and Lumbriculus variegatus occurred throughout the year. Stylodrilus heringianus occurred in winter and spring. Different naidids occur in different seasons, though half of the species can be collected all year. The micro-habitat of three tubificids, one lumbriculid and eight naidids were be identified. A high number of oligochaete species coexisted in a small stretch of the stream due to a separation in micro-habitat in space and time. The temporal variation in distribution was due to season. Particle size, the mineral and organic component of the substrate, and position in the stream bed influenced the spatial distribution of species. Temporal and spatial distribution of oligochaetes can not be separated.
2007
Species richness and distribution of oligochaetes in six reservoirs on Middle and Low Tietê River (SP, Brazil). The objective of this study was to determine the structure of the Oligochaeta populations in six reservoirs located in the Middle and Low section of Tietê River. Sampling was carried out in November 2002, in the rainy season, and in August 2003, in the dry season. In each reservoir, three transects were established: upper, middle and lower (near dam). Duplicate samples were collected with a van Veen grab which sampled an area of 337.0 cm 2. Seventeen oligochaetes species were identified. A gradient was observed in the number of species per reservoir, which diminished steadily from Barra Bonita to Três Irmãos dam. Branchiura sowerbyi was the dominant specie in every reservoir from Bariri (58.57%) down to Nova Avanhandava (92.16%), being outnumbered only in Barra Bonita, where Limnodrilus hoffmeisteri was dominant, representing 59% of the oligochaetes recorded. The highest average total densities, 470 ± 205 ind.m-2 in November 2002 and 260 ± 123 ind.m-2 in August 2003, were recorded in the Bariri reservoir. The average density, as the species richness, of oligochaetes tended to diminish downstream towards Três Irmãos, where the densities varied between 18 ± 6 ind.m-2 (November 2002) and 30 ± 12 ind.m-2 (August 2003). The grouping of the reservoirs on the basis of oligochaetes density and on the climatic periods joined the reservoirs in accordance with its geographic sequence throughout the river and also reflected their trophic state. The abundance and diversity of oligochaetes reflect the trophic state of the reservoirs and can therefore be used as a biological indicator of trophic state conditions.
Hydrobiologia, 2000
Within the Danube River delta's lakes the Oligochaeta communities comprise between 7.9% and 36.2% of the total biomass of benthic fauna. Their importance in energy flow at the ecosystem level changed in relation to fast trophic transition of all shallow lakes to the hypertrophic state. The parameters of the energy budget of the dominant populations and the potential production of benthivorous fish species assessed during 1976-1994 interval support this conclusion. P/B ratio, K 1 and K 2 coefficients assessed for both the 1976-1980 and 1991-1994 intervals revealed different functional patterns of response of Potamothrix hammoniensis (Michaelsen, 1901) and Limnodrilus hoffmeisteri (Claparede, 1862) to varying trophic conditions. Changes in communities structure, size of the constituent populations and their age distribution, as well as the quantity and quality of food supply and level of hypoxia at the sediment/water interface were the main factors that affected the role of these populations as energy carrier from the huge energy pool represented by sedimented organic carbon to benthivorous fish species.
The plausibility of using Oligochaeta to evaluate running waters in the Czech Republic
The oligochaete fauna was studied as a part of the research project of running water quality assessment based on prediction of macrozoobenthos community composition. Studied material was sampled at 57 unpolluted or moderately polluted streams in the Morava and Odra River basins (Czech Republic) in 1997 and 1998. The program TWINSPAN divided studied streams into five main groups with indicator oligochaete species. Canonical Correspondence analysis (CCA) was used to reveal the relationships among sampling sites. Principal Component Analysis (PCA) was used characterize the major gradients of environmental variables. Evaluation of small streams based on aquatic Oligochaeta is possible; it provides better information about moderately polluted streams thean about unpolluted ones.