Submerged macrophytes as a habitat for zooplankton development in two reservoirs of a flow-through system (Papuk Nature Park, Croatia) (original) (raw)
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The Effects of Two Shallow Reservoirs on the Phyto- and Bacterioplankton of Lowland River
Polish Journal of Environmental Studies, 2005
The effect of two different reservoirs on some parameters of river water quality has been studied. The Antoninek Reservoir (wetland-type, mean depth 0.4 m, area 7.2 ha, mean residence time 0.5 day) and the Maltañski Reservoir (also not stratified but plankton-type, mean depth 3.1 m, area 64 ha, mean residence time 34 days) are situated on the same river (mean discharge 0.67 m 3 s-1). Water of this river, which leaves the hypertrophic Swarzêdzkie Lake upstream from the reservoirs, is rich in nutrients and plankton. As it flows through the Antoninek Reservoir it loses most of the phytoplanktonic organisms, measured as chlorophyll-a (70%), mostly due to the shading effect of emergent vegetation. The fraction autotrophic picoplankton (APP) also decreased considerably, both in numbers and biomass (about 68% and 54% on average, respectively). A similar reduction was recorded for the numbers of bacterioplankton (39% on average) and suspended solids (66%). Phytoplankton growth was observed again in the Maltañski Reservoir, due to the longer residence time of water and lack of macrophytes. Chlorophyll-a increased by 37%, APP numbers by 120%, their biomass by 154%, while the numbers of bacterioplankton only by 31%. Changes in plankton abundance and biomass as a result of retention of water in a shallow reservoir influenced the quality of outflowing water. Their range strongly depended on the presence of macrophytes within the reservoir.
Planktonic communities in a small post-peat reservoir (Ustka Forest District, Poland)
Folia Forestalia Polonica
The aim of this study was to evaluate the present state of a small (area of 0.2 ha), shallow (mean depth of 2 m) and approximately 30-year-old post-peat reservoir located in Bruskowskie Bagno, a Baltic raised mire in northern Poland. The study was conducted during all seasons of the year (August 2019–July 2020). The reservoir was characterised by a yellow to brown water colour, low pH (5.4) and quite low conductivity (40.4 μS cm-1), which are the main features of dystrophic water bodies. Similar to natural, dystrophic lakes and ponds, the phytoplankton was mainly composed of mixotrophic species like Dinobryon sp. and Gonyostomum semen. The only numerous non-flagellate group within the phytoplankton was desmids, which indicated that the water was influenced by the mire. The reservoir was characterised by a high abundance of ciliates (annual mean of 55.6 cells ml-1) and a very high abundance of rotifers (annual mean of 3.72 ind. ml-1). Among ciliates, the most important were prostomat...
Ecological Engineering 36, 2010
The research on the Włocławek Reservoir (WR), situated on the Lower Vistula River (Poland), was carried out during two periods: between 1986 and 2002, hydrochemistry was studied, and between 1994 and 2000 – plankton. WR is 70 km2 in area, its capacity is 370 × 106 m3 and the retention time with the average flow rate (Q) amounts to 930 m3 s−1 – only 5 days (!). Until 2002, due to cyclic work of a hydroelectric power plant, considerable variability in the daily flow rate was recorded (from 600 to 1800 m3 s−1). Its specific hydrology and fluvial character mean that WR functions in a completely different way compared to dam reservoirs described in textbooks, with significantly longer retention time.WR significantly improves most of the water quality variables in the river. It reduces the concentration of suspended matter (on average by more than 50%), Ptot (by 16%), BOD5 (by 40%) and chlorophyll “a” (by 50–60%) (unpublished data).Phytoplankton is rich in species – altogether 441 taxa, with the count of 7.4 × 106 individuals per dm−3 and biomass of 16 mg dm−3. Throughout the research period, a significant reduction in the abundance of phytoplankton was recorded in WR, sometimes more than 60%. The total number of zooplankton taxa at the site upstream from WR and in the reservoir was almost identical (68 and 67), however in the reservoir itself, a small decrease in the number of Rotifera species and an increase in the number of Crustacea species was observed, as well as a significant, fourfold increase in the total zooplankton biomass. The aforementioned reduction of phytoplankton and enrichment of the river with Crustacea are one of the major biocenotic consequences of the functioning of the Włocławek Reservoir.
Bryophyte communities and seston in a karst stream (Jankovac Stream, Papuk Nature Park, Croatia)
Annales de Limnologie - International Journal of Limnology, 2012
An investigation into bryophyte communities in karst Jankovac Stream (Papuk Nature Park, Croatia) was carried out once a month from July 2008 to June 2009. Samples were taken from two lotic microhabitats: (i) Jankovac Spring (JS), a hypocrenal habitat with dense bryophyte clusters (90% bottom cover) and (ii) Jankovac Waterfall (JW), with scattered bryophyte clusters (50% bottom cover). At the same time, seston samples were collected during the spring as the source site and after the JW, as the outflow site. The goals of this study were to understand the (i) algal, protozoan and metazoan bryophyte community assemblages in these two lotic microhabitats, (ii) influence of environmental factors on the structuring of the bryophyte community and (iii) structure of seston along the longitudinal profile. A total of 172 taxa were determined: 68 algae, 55 protozoa, 24 meiofauna and 25 macroinvertebrates. Statistically significant differences between two microhabitats differing in percentage of bryophyte cover were established testing 13 environmental parameters. In dense bryophyte clusters, community structure was determined by flow velocity and pH, and macroinvertebrates achieved higher diversity and abundance. On the contrary, in scattered bryophyte coverage algae, protozoa and meiofauna reached higher abundance and diversity governed by the amount of suspended organic matter and epiphyton. In contrast to previous studies, the inverse ratio of community diversity and abundance versus percentage of bryophyte cover was established. We assume this to be the result of an enrichment of the scattered bryophyte clusters by upstream seston. Additionally, the effects of anthropogenic hydromorphological disturbance are reflected in macroinvertebrate diversity and abundance reduction.
Journal of BioScience and Biotechnology, 2018
Zooplankton communities have several vital functions within lake ecosystems, including the transfer of energy and material from producers to secondary consumers. Their structure is potentially affected by both lake morphology and typology, as well as by anthropogenic changes in lakes. These communities are also sensitive to various substances in the water column, e.g. nutrients and pollutants. Thus, they have often been used as indicators to assess the condition of and changes in lentic environments. Our aim was to present first detailed data about the species composition and structure of zooplankton communities in two understudied Bulgarian reservoirs, the Konush and Sinyata Reka Reservoirs. Twelve samples were collected in spring and summer 2016. The qualitative analysis of the zooplankton revealed the presence of 40 taxa from three main taxonomic groups: Rotifera, Cladocera and Copepoda. From these, the most frequently occurring were the rotifers (53.66%), followed by the cladocerans (24.39%) and the copepods (21.95%). The established high abundance and higher species diversity of rotifers, together with the equal distribution for all zooplankton species in the samples, confirmed the eutrophic status of both reservoirs.
The threats to small urban streams lead to a decrease in their water quality and dysregulate their ecological balance, thereby affecting the biodiversity and causing degradation of indicators that determine the ecological potential. The aim of our study was to determine the impact of abiotic conditions induced by intensive human activity on the community structures of invertebrates (zooplankton and macroinvertebrates) in the small urban stream Bukówka in the Szczecin agglomeration (NW Poland). This stream exhibits the same characteristics as a large river, in which the mass of live organic matter increases with their length. The composition of invertebrates (zooplankton and macroinvertebrates) was strongly influenced by the changes caused by humans in the stream bed. The construction of small reservoirs and bed regulation in this small urban streams had a similar effect on the quality of the water and ecological potential as in large rivers, but at a lower scale. are conducive to their development and reproduction . Among the studies on the presence of micro-and macroinvertebrates in small streams, most have focused on a common topic-the impact of environmental factors (current velocity, water retention time, inorganic nutrients concentration, and other physico-chemical compounds) on their taxonomy and abundance . Small urban streams undergo very rapid environmental changes, as these are under the strong influence of local factors that disrupt their functioning, such as human activity in the catchment and in the bed or rapid water runoff from the urban surface.
Opuscola Zoologica Budapest, 2008
The Gemenc Floodplain, situated between the 1498 th and 1470 th river-kilometres of the River Danube, is part of the Danube-Dráva National Park in Hungary. The floodplain is one of the largest in Europe with an area of 18,000 hectares, and within its territory various typical side arms and backwaters can be found. The area needs hydrological revitalization because of the sinking river bed, caused by the regulation of the main arm at the end of the 19 th century. In order to assess the conditions of the intervention, an exhaustive knowledge about the hydrobiological relations of the different water bodies will be necessary. The aim of our study was to explore connections between the hydrological events, the physical-chemical parameters of the waterbodies, and the abundance of the planktonic crustacean and rotifer assemblages.
Zooplankton community structure along a trophic gradient in a canyon-shaped dam reservoir
Journal of Plankton Research, 2000
The zooplankton community was surveyed along the longitudinal axis of Rimov Reservoir (Czech Republic) on seven occasions during the vegetative season of 1996. The dimictic Rimov Reservoir has a pronounced trophic gradient along its axis. In nearly all samples, rotifers were dominant by numbers and formed on average 60-95% of the total zooplankton (including copepod nauplii). There was a consistent pattern of increasing relative abundance of rotifers in the upper regions of the reservoir compared with the downstream parts. Very large rotifer populations could develop in the upper regions, often associated with flood events, but also coinciding with reduced abundance of crustaceans associated with stronger wash-out effects and the advent of turbid conditions. There was a greater similarity between two adjacent sites in the proportions of crustacean species than of rotifer species. This is partially due to the greater species diversity of rotifers than of crustaceans. The timing of the seasonal succession of zooplankton species showed a coherent pattern along the whole longitudinal profile. The site-specific zooplankton patchiness seems to be reduced as there was no site dependence if average data on zooplankton composition from downstream lacustrine sites were compared.