scholarly journals Changes in Algal Plankton Composition and Physico-Chemical Variables in a Shallow Oxbow Lake

Water ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2339
Author(s):  
Majd Muwafaq Yaqoob ◽  
Csaba Berta ◽  
László József Szabó ◽  
György Dévai ◽  
Szilárd Szabó ◽  
...  
Keyword(s):  
Water Body ◽  
Arable Land ◽  
Algal Species ◽  
Open Water ◽  
Early Summer ◽  
Oxbow Lake ◽  
Algal Community ◽  
Vegetation Coverage ◽  
Transition Zones ◽  
Physico Chemical

In our work, we sought to answer whether we find differences among the various zones of an oxbow lake with different land uses based on physico-chemical variables and dominant algal plankton species. The two ends of the oxbow lake are bordered by settlements, and near them there are open water areas where fishing is the major utilization form. Between the two open water areas we find a protected area with a large aquatic plant coverage and two transition zones towards the open water areas. The oxbow lake receives periodic water replenishment only at one end from one of the open water areas. During summer—due to the lack of rain—the water of the oxbow lake is used for irrigation in the surrounding arable land, so the water level fluctuation can be significant in the riverbed. Our study was performed within a vegetation period of spring, early summer, mid-summer, and fall. In connection with the ecological classification of a smaller water body, studies on the physical and chemical properties of the water and the composition of the algal plankton are usually carried out in few places and relatively infrequently. The characteristics of a water body are also influenced by seasonal changes, which can be the changes in the extent of vegetation coverage, the way land is used and the possibility of water replenishment, to which the algal community usually responds with changes. Based on our study, it can be said that even in a relatively small water body, we found a large differences based on the chemical and physical properties of the water and the characteristic algal species. Open water zones, areas with large macrovegetation coverage, and the transition zones were separated from each other.

Phytoplankton of the Irkutsk Reservoir as an indicator of water quality

2012 ◽  
Vol 41 (2) ◽  
Author(s):  
Galina Popovskaya ◽  
Alena Firsova ◽  
Anna Bessudova ◽  
Maria Sakirko ◽  
Alexander Suturin ◽  
...  
Keyword(s):  
Water Quality ◽  
Species Composition ◽  
Lake Baikal ◽  
Water Body ◽  
Phytoplankton Biomass ◽  
Trophic Status ◽  
Algal Species ◽  
Open Water ◽  
Chemical Parameters ◽  
Oligotrophic Water

AbstractThe species composition of phytoplankton and quantitative parameters of its abundance are indicators of ecological conditions in a water body. This paper deals with the analysis of phytoplankton in the Irkutsk Reservoir, which was formed more than 50 years ago on the Angara River flowing out of Lake Baikal. The level of phytoplankton development in the reservoir is directly dependent on the abundance of diatoms in Lake Baikal. The dominant assemblage of algal species is stable and consists mainly of diatoms, chlorophytes, and chrysophytes. Cyanobacteria are represented by a small number of species with low abundance. According to the composition of indicator species, the water in the lower reaches of the Irkutsk Reservoir can be classified as clean. The saprobity index in the open-water period is 1.2, increasing to between 1.3 and 1.5 in small bays. The values of phytoplankton biomass and chemical parameters of water recorded in 2008 indicate that the Irkutsk Reservoir is an oligotrophic water body. Its trophic status has not changed significantly since the time of impoundment (1956–1958).

scholarly journals Water Birds as Indicators of Ecological Conditions in a Ramsar Wetland (Sebkhet Bazer, East of Algeria)

2021 ◽  
Author(s):  
Sabrina Djerboua ◽  
Sofia Djerdali ◽  
José Guerrero-Casado ◽  
Abdelkrim Si Bachir ◽  
Ali Guendouz
Keyword(s):  
Water Body ◽  
Linear Models ◽  
Abiotic Factors ◽  
Bird Community ◽  
Ecological Indicator ◽  
Bird Abundance ◽  
Seasonal Differences ◽  
Water Bird ◽  
Physico Chemical ◽  
Water Birds

Background: Wetlands are the highly complex ecosystems due to various interactions between the components, where, the most iconic of ecological changes are the water birds. The current study was aimed to examine the interactions between the water birds diversity, abundance and the abiotic factors in Sebkhet Bazer. Methods: The investigation was conducted between March 2013 and December 2014 in Sebkhet Bazer (Sétif, Algeria, 36°05'N and 5°45'E), by monitoring water birds abundance (grouped into 4: Anatidae, Rallidae, Phoenicopteridae and Shorebirds) and measuring the physico-chemical water parameters (depth, temperature, pH, salinity and vegetation cover). All statistical analysis was performed using the InfoStat software (2017), it was carried out in two steps, by testing of fixed linear models; first of the seasonal differences in water body variables and second of the seasonal differences in bird abundance for the 4 water bird groups. Result: The results showed that the physico-chemical parameters of water varied considerably from season to season. The four groups of birds reached their lowest abundance in summer, with Rallidae and Phonicopteridae being more abundant in spring, Anatidae in winter and Shorebirds in autumn, suggesting that this variation is attributed to changes in water body characteristics between the four seasons. Therefore, the abundance of the different water bird group could be used as an ecological indicator of this wetland’s characteristics. If these features are altered by climate change, the water bird community would be also affected.

scholarly journals Assessment of diversity and physico-chemical parameters of cyanobacteria, diatoms and other algal species in the paddy fields of Belagavi district, Karnataka

2020 ◽  
Vol 7 (3) ◽  
pp. 378-382
Author(s):  
Santoshkumar Jayagoudar ◽  
Pradeep Bhat ◽  
Ankita Magdum ◽  
Duradundi Sakreppagol ◽  
Laxmi Murgod ◽  
...  
Keyword(s):  
Algal Species ◽  
Soil Samples ◽  
Chemical Parameters ◽  
Range Estimation ◽  
The North ◽  
Physico Chemical ◽  
Water And Soil Samples ◽  
Study Sites ◽  
Good Range

Algae are the diverse group of organisms in the soil and aquatic environment. The role of them in soil fertility enhancement has been extensively studied worldwide. Belagavi is a tropical agricultural belt in the North Karnataka region with highly fertile soil. Water and soil samples were collected randomly from the paddy field of 15–20 well-distributed spots in 4 selected locations viz Kusumali, Jamboti, Kinaye and Piranwadi. The identification revealed the presence of 94 species and 71 genera in the investigated sites. Among all, 62 species belonged to Bacillariophyceae, 14 species to Chlorophyceae, 10 species to Cyanophyceae, 3 to Xanthophyceae, followed by Trebouxiophyceae and Zygnematophyceae (2 species each) and one species of Ulvophyceae. The maximum number of 62 species was recorded from Kusamali, followed by 49 species in Kinaye, 44 in Jamboti and 35 in Piranwadi. The month of February had the highest number of species (61), decreased to 45 in March, 42 in April and 37 in May. Among the physicochemical parameters analysed for the soil samples, it was found that the pH of the soil is slightly acidic in all the study sites ranged between 5.03–5.85. Further, the electrical conductivity (EC) varied from 0.27–0.345 dS/m, found to be in a good range. Estimation of available micro and macronutrients of soil were measured, and it was found to be at low to moderate levels. The present study indicates the extensive distribution of different classes of algae in the rice fields of four study locations in Belagavi.

scholarly journals Studies Regarding Primary Succession in a Mine Tailing Pond from Bozanta, Maramureș County

2020 ◽  
Vol 77 (1) ◽  
pp. 27
Author(s):  
Aurel MAXIM ◽  
Tania MIHAIESCU ◽  
Teodor RUSU ◽  
Vasile ROMAN ◽  
Andrei STOIE ◽  
...  
Keyword(s):  
Vegetation Coverage ◽  
Grass Species ◽  
Tailing Pond ◽  
Salix Caprea ◽  
Physico Chemical ◽  
Three Samples ◽  
Synthetic Indicator ◽  
Average Abundance ◽  
Population Indices ◽  
Alert Threshold

The objective of this study is to carry out a vegetation study at the Bozanta’s tailing pond, located 5 km away from Baia-Mare.Between 2016 and 2017, using the metric frame, the existing species were identified and the following phytocenothic and population indices were determined: presence, frequency, presence classes, and the average abundance-dominance. Soil samples were taken to perform the following physico-chemical analyses: pH, P, K, N, humus and heavy metals.The floral inventory shows the presence of six tree species, four species of and 30 herbaceous species. Eleven years after the pond closure, the surface is covered with: 30% vegetation coverage, 35% water gloss and the 35% difference is occupied by arid. The average abundance-dominant synthetic indicator showed that the highest coverage is found in Betula pendula, Salix caprea, and in the grass species, Phragmites australis.The results of physicochemical analyses of the substrate showed very wide ranges of pH and different amounts of phosphorus, potassium and humus, and low amounts of nitrogen. The presence and concentration of the following heavy metals were determined from three samples: Cd, Pb, Ni, Cr. In regards to lead and chromium level, the alert threshold has not been reached.

scholarly journals Spatial and Temporal Variations in Pigment and Species Compositions of Snow Algae on Mt. Tateyama in Toyama Prefecture, Japan

2021 ◽  
Vol 12 ◽  
Author(s):  
Tomomi Nakashima ◽  
Jun Uetake ◽  
Takahiro Segawa ◽  
Lenka Procházková ◽  
Akane Tsushima ◽  
...  
Keyword(s):  
High Performance ◽  
Algal Species ◽  
High Performance Liquid Chromatographic ◽  
Temporal Variations ◽  
Algal Community ◽  
Rrna Gene ◽  
Polar Regions ◽  
Dominant Type ◽  
Content Type ◽  
Snow Algae

Snow algae are photosynthetic microbes that inhabit the melting snow surface in alpine and polar regions. We analyzed the pigment and species composition of colored snow collected on Mt. Tateyama in Japan during the melting seasons of 2015 and 2016. High-performance liquid chromatographic analyses of the pigments extracted from the colored snow showed that their composition varied within the study area and were classified into four types: Type A (astaxanthin-monoester dominant), Type B (medium astaxanthin-monoester content), Type C (abundant primary carotenoids and free-astaxanthin), and Type D (abundant primary carotenoids and astaxanthin diesters). Types A and B were most commonly observed in the study area, whereas Types C and D appeared only at specific sites. Analysis of the 18S ribosomal RNA (18S rRNA) gene revealed six major amplicon sequence variants (ASVs) of snow algae, belonging to the Sanguina, Chloromonas, and Chlainomonas groups. The relative abundance of the algal ASVs showed that Sanguina was dominant (>48%) in both Types A and B, suggesting that the difference in astaxanthin abundance between the two types was caused by the production of pigments in the algal cells. The algal community structures of Types C and D differed from those of Types A and B, indicating that the primary carotenoids and astaxanthin diesters were derived from certain algal species in these types. Therefore, astaxanthin-rich Sanguina algae mostly induced the red snow that appeared widely in this alpine area; however, they were partially dominated by Chloromonas or Chlainomonas algae, causing different pigment compositions.

The migratory behaviour of narwhals (Monodon monoceros)

2003 ◽  
Vol 81 (8) ◽  
pp. 1298-1305 ◽  
Author(s):  
Mads Peter Heide-Jørgensen ◽  
Rune Dietz ◽  
Kristin L Laidre ◽  
Pierre Richard ◽  
Jack Orr ◽  
...  
Keyword(s):  
Open Water ◽  
High Arctic ◽  
Early Summer ◽  
Canadian High Arctic ◽  
Baffin Bay ◽  
Bay Area ◽  
Monodon Monoceros ◽  
Migratory Routes ◽  
Somerset Island ◽  
Wintering Ground

Sixteen female narwhals (Monodon monoceros) were tracked by satellite in 2000 and 2001 from their summering ground near Somerset Island in the Canadian High Arctic to their wintering ground in central Baffin Bay. The wintering ground location was spatially discrete from another narwhal wintering ground in southern Baffin Bay. Area extent of the summering ground was approximately 9464 km2 and area extent of the wintering ground was 25 846 km2. Two of the narwhals were tracked for more than 12 consecutive months. These whales used three focal areas between their spring and autumn migration: a coastal area in the open-water season in August in the Canadian High Arctic, a wintering area from November through April in the consolidated pack ice of Baffin Bay, and an early summer area in front of the receding fast ice edge in Lancaster Sound. The whales showed remarkable site fidelity to summering grounds and had specific migratory routes that followed sea ice formation and recession.

scholarly journals Microclimate and matter dynamics in transition zones of forest to arable land

2019 ◽  
Vol 268 ◽  
pp. 1-10 ◽  
Author(s):  
Martin Schmidt ◽  
Gunnar Lischeid ◽  
Claas Nendel
Keyword(s):  
Arable Land ◽  
Transition Zones

scholarly journals The littoral zone of polar lakes: inshore–offshore contrasts in an ice-covered High Arctic lake

2020 ◽  
pp. 1-24
Author(s):  
Paschale N. Bégin ◽  
Milla Rautio ◽  
Yukiko Tanabe ◽  
Masaki Uchida ◽  
Alexander I. Culley ◽  
...  
Keyword(s):  
Light Availability ◽  
Sharp Decrease ◽  
Open Water ◽  
High Arctic ◽  
Early Summer ◽  
Fatty Acid Profiles ◽  
Canadian High Arctic ◽  
Abrupt Increase ◽  
Horizontal Gradients

In ice-covered polar lakes, a narrow ice-free moat opens up in spring or early summer, and then persists at the edge of the lake until complete ice loss or refreezing. In this study, we analyzed the horizontal gradients in Ward Hunt Lake, located in the Canadian High Arctic, and addressed the hypothesis that the transition from its nearshore open-water moat to offshore ice-covered waters is marked by discontinuous shifts in limnological properties. Consistent with this hypothesis, we observed an abrupt increase in below-ice concentrations of chlorophyll a beyond the ice margin, along with a sharp decrease in temperature and light availability and pronounced changes in benthic algal pigments and fatty acids. There were higher concentrations of rotifers and lower concentrations of viruses at the ice-free sampling sites, and contrasts in zooplankton fatty acid profiles that implied a greater importance of benthic phototrophs in their inshore diet. The observed patterns underscore the structuring role of ice cover in polar lakes. These ecosystems do not conform to the traditional definitions of littoral versus pelagic zones but instead may have distinct moat, ice-margin, and ice-covered zones. This zonation is likely to weaken with ongoing climate change.

Ecological and geographical variations in the siphonal index of Culex pipiens larvae (Diptera: Culicidae)

1996 ◽  
Vol 86 (3) ◽  
pp. 281-287 ◽  
Author(s):  
E.B. Vinogradova ◽  
S.Ya. Reznik ◽  
E.S. Kuprijanova
Keyword(s):  
Water Body ◽  
Culex Pipiens ◽  
Open Water ◽  
Published Data ◽  
Strongly Correlated ◽  
Reproductive Diapause ◽  
Body Type ◽  
Underground Waters ◽  
Geographical Variations ◽  
The Mean

AbstractCulex pipiens Linnaeus is represented by two forms: the form molestus which is autogenous, stenagamous and has no reproductive diapause, and the form pipiens which is anautogenous, eurygamous and diapauses. The ecological, physiological and geographical variations in the larval siphonal index of C. pipiens (the ratio of the length of the siphon to its width at the base) was investigated using both original measurements and previously published data. In all, data were used from 259 collections from open water bodies (marshes, ditches, holes, barrels, etc.) and underground waters (house basements) in areas of Europe, Asia and part of Africa. Autogeny was studied in some cases by dissection of females. In C. pipiens the mean siphonal index was strongly correlated with ecology (water body type) and adult physiology (autogeny). In spite of high geographical and individual variation, which makes the identification of individual larvae difficult, the mean siphonal index can be used with certainty for the differentiation of populations of the two forms of C. pipiens.

PATTERNS OF VARIATION IN ALGAL COMMUNITIES ALONG THE MEDITERRANEAN COAST, ISRAEL

1998 ◽  
Vol 46 (2) ◽  
pp. 89-99 ◽  
Author(s):  
Barbro Lundberg ◽  
Linda Olsvig-Whittaker
Keyword(s):  
Algal Species ◽  
Mediterranean Coast ◽  
Algal Community ◽  
Habitat Types ◽  
Community Patterns ◽  
Algal Communities ◽  
Sea Floor ◽  
Ordination Techniques ◽  
The Mediterranean ◽  
Composite Samples

Algal species composition and cover data were collected from sixteen stations along 150 km of the Mediterranean coast of Israel during 1973–1995. The samples produced 185 composite samples from three habitat types, platform, wall, and rocky sea floor, which were analyzed using numerical classification and ordination techniques (TWINSPAN and RDA) to determine whether habitat, season, site, or yearly patterns correlate with observed differences between the algal communities. We conclude that habitat is the most important factor determining algal community composition, followed by season and site. Community patterns fluctuate between years but show no trends. Some recommendations for future monitoring are given.

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