Abstract The impact of a large lowland temperate zone reservoir on chironomid and fish biodiversity was investigated in the same upstream (U) downstream (D) sites sampling occasions spring autumn several post‐impoundment years. true/Hill N 1 diversity measure used to construct models impact, partitioning reveal importance ecological gradients. is unique being decomposable among multiple levels easily comparable across ecosystems animal groups. Chironomids were more diverse than all community...

In the spring and summer of each year, large patches submersed aquatic macrophytes overgrow bottom alluvial Warta River downstream a dam reservoir owing to water management practices. Environmental variables, macroinvertebrates (zoobenthos epiphytic fauna, zooplankton) fish abundance biomass were assessed at this biologically productive habitat learn intraseasonal dynamics food types, their occurrence in gut contents small-sized roach, dace, perch, ruffe three-spined stickleback. Gut...

Chironomids (Diptera: Chironomidae) are a family of dipterans with global distribution. Owing to their great functional diversity and ability adapt wide range environmental conditions, they often dominate in freshwater macroinvertebrate communities, playing key role the cycling organic matter flow energy aquatic ecosystems. Our aim was analyze structure chironomid assemblages identify factors, including current velocity, river width, water depth, temperature, dissolved oxygen, percentage...

ABSTRACT The response of macroinvertebrates to changes in flow was studied the Drzewiczka River at downstream end a whitewater slalom-canoeing track located tailwater dam. From 1980 2002, surface water released daily, except winter, from reservoir for two-three hours enable training canoeists. Discharge ranged 2.1 12.0 m3 s−1 daily during this high discharge fluctuation period (DI), when measured 2000–2001. emptied dredging February after which river returned its natural about 2 s−1, time we...

Abstract The weatherfish ( Misgurnus fossilis ) is a species that tolerant of unfavourable environmental conditions and can survive low dissolved oxygen concentrations high water temperatures. Although this occurs across almost the whole Europe, protected in many countries, relatively little known regarding its ecology. To determine diet weatherfish, 120 individuals from an artificial drainage canal central Poland were collected two seasons (spring late summer) with contrasting abiotic...

Abstract Submersed plants appeared in the impounded section of Warta River as a consequence low discharge summer and were colonized by epiphytic fauna dominated Hydra sp., Simuliidae, Chironomidae. The three-spined stickleback consumed it voraciously, their diet composition closely reflected available food resources. In May alimentary tracts filled with Cladocera drifting from reservoir, then dominant taxa associated macrophytes, especially chironomid periphyton scrapers. A comparison...

Multiscale determinants of riverine chironomid species richness were assessed in seven rivers Central Poland, an area representative the European temperate climatic zone. The impact environmental factors, seasonality, as well concepts gamma diversity, i.e. habitat (HSR), alpha local (LSR), and relationships between these, beta studied. One site each river was defined a monthly LSR time series data obtained at over full annual cycle for analysis. No strong trend detected. autocorrelation...

High values of chironomids' production were recorded and analysed in the tailwater a dam reservoir located on large river. The resulted from submersed aquatic macrophytes (SAM) patches that appear bottom summer, as an effect specific discharge pattern through dam. Abundant taxonomically rich chironomid assemblages develop there, but their populations display different spatial trophic preferences, which are main topic our interest here. We focused dominant taxa Orthocladius/Cricotopus spp.,...

Providing parental care is potentially costly. Costs can arise through elevated energy expenditure or from an increased risk of mortality. A cost also occur because a parent compromised in their ability to forage. We used pumpkinseed Lepomis gibbosus, fish with alternative male mating strategy, test whether males differed feeding comparison females and cuckolder males. To address this question, we examined the stomach contents female, male, during breeding season over entire diel cycle....

The distribution and coexistence of two unrelated commensals, the chironomid Epoicocladius ephemerae (Kieffer 1924) ciliate Carchesium polypinum L. 1758, on one host species, Ephemera danica Muller 1764, sampled in small lowland rivers 2009, 2010 2011, were investigated. We analyzed 288 mayfly specimens from Bzura River 101 Mroga River. number commensals a single specimen varied between 0 18 chironomids, to 46 colonies ciliates. Prevalences >48% for chironomids ∼30% ciliates, whereas mean...

This study represents a description of the diet composition one largest European cobitids, weatherfish Misgurnus fossilis. Specimens were collected in drainage canal, representing typical habitat for weatherfish, and with gut content analysis conducted regard to individual total length maturity stage. Overall, mainly consisted Copepoda, Cladocera, Ostracoda, Oligochaeta, Asellus aquaticus, Chironomidae Coleoptera larvae, Gastropoda, detritus. To evaluate size-related patterns resource use,...

From May to August 2004, the available food base and diet of two cyprinid species, eurytopic roach, represented by 75 small specimens, rheophilic dace, 37 were investigated in seasonal patches submersed aquatic macrophytes (SAM) impounded lowland Warta River, Poland. The aim study was recognize spatial temporal patterns feeding both species relation resources, evaluate their niche overlap. To distinguish homogenous classes fish alimentary tracts on basis contents, a Kohonen artificial neural...

Abstract The objective of this study was to analyze macroinvertebrate assemblages dominated by Chironomidae (Diptera) and assess the protective nature these midges’ larval tubes against trace metals in weakly polluted Bzura River. This low order lowland river flows through Łódź City Municipal Area is supplied a large amount organic matter from ecotones roadside. Determination metal content sediments chironomid tissue conducted using atomic absorption spectroscopy. Our has shown that...

Due to changes of discharge regime downstream a dam reservoir, an alluvial natural stretch the Warta River changed macrophyte-dominated ecosystem. Large patches submersed, aquatic macrophytes appeared in summer and their effect is analysed this study. These contained enriched macroinvertebrate assemblages (epiphyton benthos) they were refuge for both zooplankton young fishes released from reservoir. Despite these altered conditions stretch, roach Rutilus rutilus, perch Perca fluviatilis...