Oligochaeta of the Morava and Odra River basins (Czech Republic): species distribution and community composition (original) (raw)
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.
Hydrobiologia, 1996
Many large and small lakes of varying depths are present in the Eastern Black Sea Range of Turkey, the nation's third most important glacial region following the Ağrı and Cilo-Sat mountain ranges. During the present study, 6 expeditions to collect aquatic oligochaetes from these lakes were conducted in July and August of 2005August of , 2006August of , and 2007; qualitative and quantitative samples were collected from 59 glacial lakes. We present and analyze the dominancy and distribution of aquatic oligochaete assemblages and their relation to environmental factors (temperature, dissolved oxygen, pH, electrical conductivity, salinity, turbidity, PO 4 -3 -P, HCO 3 -, organic carbon, hardness, Ca 2+ , Mg 2+ , Si, water depth, and altitude) using classifi cation and ordination techniques. Canonical correspondence analysis (CCA) was used to characterize the relationship between oligochaetes and the environmental variables. As a result, we determined the 4 most important environmental variables (elevation, water depth, dissolved oxygen, and temperature) aff ecting species distribution in general. Sampling localities were clustered into 8 groups with the unweighted pair-group method with arithmetic mean (UPGMA) based on physicochemical characteristics. Th e relationships between the total number of individuals and environmental measurements were determined by a simple analysis of variance (ANOVA) test. Th e results of our analyses suggest a signifi cant positive correlation between altitude (P < 0.05; F = 2.994) and the total number of individuals.
Acta Limnologica Brasiliensia, 2011
Aim: This study evaluated the use of oligochaetes at different levels of taxonomic resolution as environmental indicators in Argentine lowland streams affected by different land uses. Methods: Sampling sites were grouped based on the physicochemical and habitat characteristics (low-, moderate-, and high-impact disturbance). Collection of the oligochaetes samples was carried out seasonally in sediment and vegetation habitats. Results: The increases in nutrients and organic matter produced elevated densities of the Oligochaeta, but when the disturbance also involved changes in the physical habitat or enhancements in toxic substances, the abundance decreased significantly to values even lower than those of non-impacted environments. The responses of Naidinae and Tubificinae were similar. The density of the Pristininae decreased with increasing impact, but those of the Enchytraeidae and Rhyacodrilinae increased at the most highly impacted sites. The Opistocystidae were not recorded in high-impact sites. Species richness and diversity (H') were lower in high-impact sites and even lower in sediments. Some species presented no restrictions in the habitat type or with the contamination level: Limnodrilus hoffmeisteri, Dero furcatus, D. digitata, D. pectinata, Pristina longiseta, and P. aequiseta. Moreover, Trieminentia corderoi, Slavina appendiculata, and Aulodrilus pigueti exhibited the highest abundances at low-impact sites and were not registered in high-impact sites. Conclusions: The Oligochaeta show a relatively wide ecological valence through their extensive number of species. Although lower taxonomic levels can give information about environmental status, test-species' sensitivities to different types and degrees of contamination will be of utmost relevance to the evaluation of ecological quality.
Oligochaete distribution in alpine freshwaters: not a mere question of altitude
Journal of Limnology, 2023
Alpine freshwater biodiversity is at risk of extinction due to climate change and some species could remain undescribed before they go extinct. These species are not yet included in red lists of protection by law, such as annelids in alpine habitats. Within this context, we studied the annelid fauna in 20 sites located between 1223 and 2703 m asl, belonging to different habitat types (kryal, glacio-rhithral, nonglacial streams, springs, littoral lake zone), in three glaciated catchments of the Italian Alps (Noce Bianco, Careser and Conca-Carè Alto; Trentino Province). The aim of this study was to describe the annelid communities of the different habitat types collected with different sampling methods (kick sampling and drift) and investigate the relationships between species richness and abundance with altitude. Between the years 2000 and 2005, we collected 4,765 individuals in 418 samples. One genus of Polychaeta (Aeolosoma) and 36 species of Oligochaeta were identified, distributed in four families: Enchytraeidae (28), Lumbriculidae (4), Naididae (3 and Tubificinae juveniles) and Haplotaxidae (1). Five species were new to Italy: Cernosvitoviella carpatica, Cernosvitoviella cf. crassoductus, Henlea brucei, Henlea glandulifera and Mesenchytraeus sanguineus. As expected, Enchytraeidae prevailed in all sites with the genera Cernosvitoviella and Cognettia the most abundant and frequent. The regression and cluster analyses and the generalized linear mixed models we performed, highlighted that the differences in species richness and abundance among sites are explainable partly by altitude but mainly by habitat type. A clear longitudinal species turnover was evident only in the Noce Bianco and Careser glacier-fed streams, where taxonomic diversity (tested by Seriation analysis) and abundance increased with increasing distance from the glacier front and decreasing altitude. Also expected, the harsh kryal habitat was the poorest in species and individuals, with a dominance of semi-aquatic and terrestrial enchytraeid taxa. Drift was found to be more effective than kick sampling in collecting oligochaetes, especially in glacier-fed streams where the use of the pond net is generally hindered by their high and highly variable discharge. In conclusion, this study provides new data on oligochaete fauna in alpine freshwaters, useful to implement the prevision models for Alpine biodiversity up to date not including annelid fauna.