The effect of cyanobacterial blooms in the Siemianówka Dam Reservoir on the phytoplankton structure in the Narew River

2011 ◽  
Vol 40 (1) ◽  
Author(s):  
Magdalena Grabowska ◽  
Hanna Mazur-Marzec
Keyword(s):  
Chemical Analysis ◽  
Species Composition ◽  
Phytoplankton Biomass ◽  
Cyanobacterial Blooms ◽  
Dam Reservoir ◽  
Long Distance ◽  
Toxic Cyanobacteria ◽  
Phytoplankton Structure ◽  
North Eastern ◽  
Lowland Reservoir

AbstractThe effect of cyanobacterial blooms on the phytoplankton structure in the lowland Narew River (north-eastern Poland) was examined. The studies were carried out at stations situated at different distances from the eutrophic Siemianówka Dam Reservoir. In 2008, the investigated lowland reservoir and the outflowing river were characterized by the dominance of toxic cyanobacteria (from July to October). At a station situated 130 km below the dam, species composition in the river was very similar to that in the shallow reservoir. Planktothrix agardhii was the main and permanent dominant, both in limnoplankton and potamoplankton. The current study indicates that the eutrophic Siemianówka Dam Reservoir is the main and rich source of phytoplankton for the outflowing Narew River. Cyanobacteria were dominant in the river phytoplankton at all sampling stations, but their share in phytoplankton biomass gradually decreased with the distance from the dam. Chemical analysis revealed the presence of microcystins (MCs) in water samples collected from June to October. The toxins, mainly demethylated MC analogues, were detected at a long distance down the river, even 100 km from the dam. Maximum concentration of MCs (14.3 μg l−1) was measured on 13 October, 9.1 km below the dam.

scholarly journals Spatial and temporal variation of the phytoplankton structure in cascading oligotrophic reservoirs of southeast Brazil

2020 ◽  
Vol 32 ◽  
Author(s):  
Ana Margarita Loaiza-Restano ◽  
Gisele Carolina Marquardt ◽  
Carla Ferragut ◽  
Carlos Eduardo de Mattos Bicudo
Keyword(s):  
Species Composition ◽  
Phytoplankton Biomass ◽  
Structural Changes ◽  
Longitudinal Profile ◽  
Spatial And Temporal Variation ◽  
Austral Winter ◽  
Phytoplankton Structure ◽  
Cascade Effect ◽  
Key Factor ◽  
Cascading Reservoirs

Abstract: Aim Structural changes in phytoplankton was evaluated in one ultraoligotrophic and two oligotrophic cascading reservoirs during two climatic periods (austral winter and summer) of 2014. Changes in phytoplankton biomass, species composition, and codons (functional groups) were evaluated along a vertical and a longitudinal profile. Methods Four sampling sites were selected for the first reservoir in the cascade (Cachoeira do França) and three for each of the other two reservoirs (Cachoeira da Fumaça and Serraria). Samples were collected along a vertical and a longitudinal profile. Species biomass and codons ‘sensu’ Reynolds were identified and expressed in terms of biomass. Results 18 codons were identified and associated to the reservoirs’ limnological conditions. Composition and biomass of descriptor species changed among seasons. Codon B consisting mainly of Discostella stelligera was the most frequent in all reservoirs in both climatic seasons. Conclusions Our findings showed that seasonality was the key factor for the species composition and phytoplankton codons changes. However, the cascade effect on phytoplankton structure was shown by the continuous contribution of Ceratium furcoides (codon LM) during the winter, and of Discostella stelligera (codon B) in both sampling periods in all three reservoirs.

Species Composition Of Birds Colliding With Noise Barriers In Białystok (North-Eastern Poland)

2012 ◽  
Vol 36 (1) ◽  
pp. 88-94 ◽  
Author(s):  
Adam Zbyryt ◽  
Anna Suchowolec ◽  
Rafał Siuchno
Keyword(s):  
Species Composition ◽  
Common Species ◽  
First Aid ◽  
Building Construction ◽  
Medium Size ◽  
Noise Barriers ◽  
Long Distance ◽  
North Eastern ◽  
Field Control ◽  
The Status

Abstract Until now in Poland there was no relevant data about the species composition of birds colliding with reflective plate glass in building construction and noise barriers. The research was conducted in 2010-2012. For the first two years the research was conducted only in breeding season, field control was carried out from 2 to 5 days. Since November 2011 an all year-long monitoring was started and the area was controlled once a week. In winter 2011/12 and spring 2012 there was conducted an experiment on time of carrion loss. In total there were 269 dead birds representing 43 species. The victims of window strikes were mainly common species, small or medium size passerines, residing and foraging in the low vegetation up to several meters above the ground (89%). According to the status of the species: 55% were resident or partially resident, 38% were short-distance migrants and 7% were long-distance migrants. At the base of the experiment on speed of carrion loss (N = 30), it was found that 17% of dead birds were removed after 1 week, 43% after 2 weeks and 23% after 3 weeks. There were 4 injured and stupefied birds found, despite the first aid all birds died from 3 to 48 hours after collision.

Long-term changes in fish pond management as ‘an unplanned ecosystem experiment’: importance of zooplankton structure, nutrients and light for species composition of cyanobacterial blooms

1995 ◽  
Vol 32 (4) ◽  
pp. 187-196 ◽  
Author(s):  
L. Pechar
Keyword(s):  
Species Composition ◽  
Fishery Management ◽  
Grazing Pressure ◽  
Organic Fertilizers ◽  
Cyanobacterial Blooms ◽  
Fish Stock ◽  
Fish Ponds ◽  
Single Filament ◽  
The 1950S ◽  
Water Blooms

The study presents data on the species composition of cyanobacterial water blooms in Czech fish ponds from the 1950s to the 1990s. Since the 1950s, a shift from large-colonial Aphanizomenon flos-aquae var. flos-aquae through Microcystis aeruginosa and small-colonial species of Anabaena to single-filament species (Planktohrix agardhii, Limnothrix redekei, Aphanizomenon gracile) or single-cell forms (Microcystis ichtyoblabe), has been observed. The changes in the species composition of the water blooms are closely related to changes in fishery management (increase in fish stock, increase in application of organic fertilizers). At present the high predation of fish upon zooplankton results in elimination of large colonial blooms of A. flos-aquae associated with large filtering zooplankton (Daphnia). Low grazing pressure of zooplankton, low light conditions and low N:P ratios are suitable conditions for mass development of the small species of cyanobacteria. High pH is not necessary to achieve cyanobacteria dominance.

scholarly journals Daphnia diversity in water bodies of the Po River Basin

2016 ◽  
Author(s):  
Silvia Marková ◽  
Catia Maurone ◽  
Erica Racchetti ◽  
Marco Bartoli ◽  
Valeria Rossi
Keyword(s):  
River Basin ◽  
North American ◽  
Water Bodies ◽  
12S Rrna ◽  
Long Distance ◽  
Po River ◽  
The North ◽  
North Eastern ◽  
Northern European Russia ◽  
Po River Basin

<p>Shallow water bodies dominate the areal extent of continental waters and host a proportion of biodiversity higher than the percentage of Earth’s surface they cover. <em>Daphnia</em> is a key component of small aquatic ecosystems food webs. Here we present the result of a survey in 24 ponds located in the core of Po river Basin, to assess the actual spreading of <em>Daphnia</em> species in one of the most productive areas of the Northern hemisphere. By using diagnostic genetic markers (<em>12S rRNA </em>and <em>ND5 </em>genes) we identified five <em>Daphnia</em> species: <em>D. ambigua</em>, <em>D. curvirostris</em>, <em>D. longispina</em>, <em>D. obtusa</em> and <em>D. pulex </em>in fourteen ponds. Additional analyses of two nuclear genes (<em>LdhA</em> and <em>Rab4</em>) revealed that <em>D. pulex</em> in the study area is native European strain. In opposite, <em>D. ambigua</em> shared haplotype with the North-Eastern American lineage that was introduced to Europe by long-distance dispersal. In the Po river Basin we identified a highly divergent lineage of <em>D. longispina </em>group that formed a clade with individuals from northern European Russia and might represent a new <em>Daphnia </em>species. <em>Daphnia</em> species in the Cremona province have European origin, except for <em>D. ambigua</em> which is a North American species spreading across Europe. Future attention will require monitoring of invasive species, particularly <em>D. ambigua</em> and the North American invasive clone of <em>D. pulex </em>that is already present in Northern Italy. </p>

scholarly journals Evaluation of Developmental Structures and Cenopulation State Cerastium davuricum Fisch. ex Spreng. in the Highlands of the Lesser Caucasus

2021 ◽  
Vol 7 (6) ◽  
Author(s):  
R. Guliyeva
Keyword(s):  
Species Composition ◽  
Biological Characteristics ◽  
Age Composition ◽  
The North ◽  
First Case ◽  
North Eastern ◽  
Lesser Caucasus ◽  
Favorable Conditions ◽  
Economic Use ◽  
North Eastern Part

On the highlands of the north – eastern part of the Lesser Caucasus were investigated ontogenetic characteristics Cerastium davuricum in different type of plants. There are found that cenopopulation spices goes through a 4- and 10-year periods. Age composition cenopopulations species is very variable and is associated with the biological characteristics of species composition of the sward, the economic use of pastures. In research found the following types of cenopopulation: normal, invasive, regressive. Meanwhile, the predominance of vegetative individuals in the population in the first case indicates the weakness of cenopopulation, and in the second case, the high number of generative individuals indicates the sustainability of cenopopulation. This arrangement of population under less favorable conditions compared with another one.

Made for exchange: the Russian Karelian lithic industry and hunter-fisher-gatherer exchange networks in prehistoric north-eastern Europe

Antiquity ◽  
2021 ◽  
pp. 1-17
Author(s):  
Alexey Tarasov ◽  
Kerkko Nordqvist
Keyword(s):  
Material Culture ◽  
Eastern Europe ◽  
Large Scale ◽  
Scale Production ◽  
Long Distance ◽  
Exchange Networks ◽  
North Eastern ◽  
Agricultural Societies ◽  
Lithic Industry ◽  
Distance Communication

The hunter-fisher-gatherers of fourth- to third-millennium BC north-eastern Europe shared many characteristics traditionally associated with Neolithic and Chalcolithic agricultural societies. Here, the authors examine north-eastern European hunter-fisher-gatherer exchange networks, focusing on the Russian Karelian lithic industry. The geographically limited, large-scale production of Russian Karelian artefacts for export testifies to the specialised production of lithic material culture that was exchanged over 1000km from the production workshops. Functioning both as everyday tools and objects of social and ritual engagement, and perhaps even constituting a means of long-distance communication, the Russian Karelian industry finds parallels with the exchange systems of contemporaneous European agricultural populations.

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