scholarly journals Reconstruction of flood events in an oxbow lake (Marótzugi-Holt-Tisza, NE Hungary) by using subfossil cladocerans remains and sediments

2016 ◽  
Vol 1 (1S) ◽  
Author(s):  
János Korponai ◽  
István Gyulai ◽  
Mihály Braun ◽  
Csilla Kövér ◽  
István Papp ◽  
...  
Keyword(s):  
Water Regime ◽  
Fine Sand ◽  
Oxbow Lake ◽  
Oxbow Lakes ◽  
Flood Events ◽  
Chydorus Sphaericus ◽  
Bosmina Longirostris ◽  
Cladoceran Remains ◽  
The Core ◽  
Main River Channel

<p>Oxbow lakes are important components of the floodplain systems of lowland rivers. During flood events, oxbows are connected with the main river channel, and behave as lotic systems, while during inter-flood periods, these lakes can be considered as lentic ecosystems. Rivers are generally poor in planktonic organisms and their sediments contain scarce biological remains in comparison to lentic water ecosystems. However, due to their alternating running and standing water regime, sedimentary biological remains of oxbow lakes can be used as proxies for tracking changes of past hydrological regimes. In this study we investigated how cladoceran communities respond to flood events, and whether flood events can be recognized by community analysis of cladoceran remains. A sediment core from Marótzugi-Holt-Tisza oxbow lake was analyzed for identification of past flood events based on changes in the subfossil Cladocera community. Floods were defined based on the proportion of fine sand (50 µm grain size) in the oxbow sediments. If the fine sand portion was &lt;3%, the water regime of the oxbow was considered as lentic, otherwise it was lotic. Both organic and pigment contents were significantly higher in the core sections deposited during lentic stages. Thirty-four Cladocera species were determined in this core, all common to littoral habitats of eutrophic shallow lakes in Hungary. One planktonic (<em>Bosmina longirostris</em>) and four chydorid species (<em>Alona rectangula</em>, <em>Acroperus harpae</em>, <em>Alonella nana</em> and <em>Chydorus sphaericus</em>) were dominant  throughout the core and contributed &gt;90% of total remains. Discriminant analysis on cladoceran data confirmed that lotic and lentic hydrological stages were characterized by different Cladocera species associations. <em>Bosmina longirostris, Chydorus sphaericus, Alona rectangula, Acroperus harpae, Leydigia leydigi, A. quadrangularis </em>and<em> A. nana</em> were mainly responsible for the differences between lotic and lentic species assemblages.  Our results revealed that Cladocera remains can be used to track changes in the hydrological regime of oxbow lakes.  </p><p> </p>

Sustainable aquaculture development in oxbow lakes with emphasis on the involvement of women.

2020 ◽  
Author(s):  
Md. Kibria
Keyword(s):  
Fish Farming ◽  
Active Participation ◽  
Economic Effects ◽  
Oxbow Lake ◽  
General Idea ◽  
Oxbow Lakes ◽  
Pond Aquaculture ◽  
And Gender ◽  
Aquaculture Development ◽  
River Bend

Abstract A total of 600 oxbow lakes are located in the southwestern part of Bangladesh, covering 5,488 ha. An oxbow lake (baor) is an old cut-off river bend, usually in the shape of a horseshoe. Pond aquaculture for women was introduced in oxbow lakes in 1995-1996 to allow their active participation in aquaculture as a livelihood activity. The shallow and silted parts of the baor were excavated into 0.5 to 1.5 ha size fishponds. This study was conducted in 1999 in two selected oxbow lakes in Jessore district to assess the technological and socio-economic effects of fish farming groups (FFGs) and pond aquaculture in oxbow lakes with emphasis on the involvement of women. Three categories of questions (socio-economic, technical and gender) were asked of FFG members. This study shows that initially when the women became involved in pond excavation and dike compaction, as members of the FFGs, most of their men members did not like this. As Bangladesh is a Muslim-dominant country, there is a general idea among men that women should not work outside together with men. However, after a few years, once the success of the women's fish farming activities and marketing became clear, their social status and respect in the society and family increased through their active participation in this process. A total of 23 oxbow lakes in five districts around Jessore, covering 1,400 ha, have been handed over from the Ministry of Land to the Department of Fisheries (DOF). Subsequently, the DoF transferred the user-rights to the beneficiaries for a period of 50 years.

scholarly journals Habitat factors differentiating the occurrence of Ostracoda (Crustacea) in the floodplain of a small lowland River Krąpiel (N-W Poland)

2020 ◽  
pp. 23
Author(s):  
Agnieszka Szlauer-Łukaszewska ◽  
Vladimir Pešić
Keyword(s):  
Abiotic Factors ◽  
River Channel ◽  
Water Bodies ◽  
Oxbow Lakes ◽  
Factors Associated ◽  
Main River ◽  
Main River Channel ◽  
Habitat Factors ◽  
Sediment Sorting ◽  
Physical And Chemical

We analysed the occurrence of ostracods in a small river, taking into account all the types of water bodies in the floodplain − these included helocrenes, oxbow lakes, and ponds, as well as the main river channel. The objective of the study was to investigate the variation in ostracod communities and identify those factors determining species distribution. The environmental factors considered were the type of water body, responsible for 17% of the variance, the physical and chemical water properties (29%), and the biotic and abiotic factors associated with the substrate type (23%). Among the factors associated with the substrate, sediment sorting, plant coverage and insolation were the most important. The ostracod fauna of the helocrenes differed from that of the other water bodies in the floodplain. In the water bodies of the Krąpiel valley and in the main river channel, 33 ostracod species were recorded, of which 26 were found in the main river channel. Refugia in the floodplain were the main source of the diversity and abundance of ostracods in the main river channel. The mean density in the main river channel was very low, at 330 indiv. m−2, while in the water bodies of the floodplain it was the greatest, reaching up to 5568 indiv. m−2.

scholarly journals Coleoptera associated with macrophytes of the genus Salvinia in four oxbow lakes in two river basins in southeast Brazil

2015 ◽  
Vol 75 (4 suppl 1) ◽  
pp. 108-118 ◽  
Author(s):  
M. C. Paula-Bueno ◽  
A. A. Fonseca-Gessner
Keyword(s):  
River Basins ◽  
River Channel ◽  
The State ◽  
The Other ◽  
Oxbow Lakes ◽  
Aquatic Fauna ◽  
Southeast Brazil ◽  
Main River ◽  
Main River Channel ◽  
The Difference

Abstract Macrophytes in oxbow lakes represent an important substrate for the Coleoptera. Two oxbow lakes the Rio Paranapanema were studied and the other two Rio Mogi-Guaçu, in the State de São Paulo, Brasil. In this study, there is greater similarity between the communities of Coleoptera of lakes greater connectivity with the main river channel or the difference in the species of Salvinia collected in the lakes studied interferes Coleoptera fauna that uses as substrate. A total of 9,222 specimens of Coleoptera were collected and identified in 10 families and 40 genera. The analysis MDS for abundance of Coleoptera showed the grouping of the oxbow lakes the Paranapanema River and a distancing the oxbow lakes the Mogi-Guaçu. The PERMANOVA test did not reveal any difference in the fauna between the wet and dry periods. It was concluded that the connectivity between river and lake is not decisive for the richness and abundance of aquatic fauna of Coleoptera. Therefore, the richness and abundance of aquatic Coleoptera associated vary with the species of Salvinia used as substrate.

scholarly journals Palaeoenvironmental reconstruction based on the Early Holocene Haelen sequence, near Roermond (southeastern Netherlands)

2016 ◽  
Vol 96 (2) ◽  
pp. 115-130 ◽  
Author(s):  
Johanna A.A. Bos ◽  
Bas van Geel
Keyword(s):  
Open Water ◽  
Early Holocene ◽  
Oxbow Lake ◽  
High Temporal Resolution ◽  
Oxbow Lakes ◽  
Humid Climate ◽  
Herbaceous Vegetation ◽  
Large Herbivores ◽  
River Floodplains ◽  
Meuse River

AbstractHigh-resolution Early Holocene palynological records from the middle Meuse River valley were missing until recently. In order to investigate environmental and inferred climate changes during the Preboreal, sediments from a former residual channel of the Meuse River near Haelen were studied. Detailed multi-proxy analyses, including microfossils, macroremains and loss-on-ignition measurements, were carried out at a high temporal resolution. An accurate chronology of the >1000-year-long record was provided by accelerator mass spectrometry (AMS)14C wiggle-match dating.The channel was abandoned during the late Younger Dryas, when accumulation started with gyttja. This period was characterised by an open landscape with herbaceous vegetation and dwarf shrubs. Patches of birch were present on the floodplains around depressions and (oxbow) lakes. Some pines survived the cold in sheltered locations. In the residual channel the water was flowing temporarily and aquatic plant communities developed with predominantly submerged taxa and algae. The shores were fringed by willows and sedges and were probably used as a watering place by large herbivores.Following the Late-glacial/Holocene climate warming, dated in the Haelen record around 11,520 cal BP, birch woodlands expanded on the river floodplains and slopes of terraces during the Friesland Phase. Open vegetation with herbs and juniper remained present on the nearby terraces. An increase in the water level of the oxbow lake and seepage of groundwater occurred. Along the shores herbaceous vegetation was present. Around 11,420 cal BP, birch expansion was interrupted by the dry continental Rammelbeek Phase. On the river floodplain and terrace slopes, open grassland vegetation developed and on the terraces, grasslands and open grounds were abundant. In the residual channel the water became stagnant and floating-leaved vegetation developed. At the start of the Late Preboreal, around 11,270 cal BP, a sudden shift to a more humid climate took place and birch forests expanded again on the river floodplains and terrace slopes. Poplar became more abundant in these forests, and birch and poplar swamp forests were present near the site. Pine expanded atc. 11,160 cal BP on the higher sandy and gravelly terraces. During the Late Preboreal a reed swamp developed on the shores of the residual channel.At the onset of the Boreal, around 10,710 cal BP, woodlands, initially with hazel, but later also with oak, elm and lime, started to develop, while pine forest remained present on the higher terraces. Hazel shrubs were growing on the terrace slopes. Birch and poplar forests occurred on moist parts of the floodplains. Around the residual channel they formed a zone behind the reed swamps surrounding the oxbow lake. Vegetation with water lilies was present in open water.The Haelen record shows, despite a lack of archaeological evidence, indications for the presence of Mesolithic people in the area during the Preboreal. These include the occurrence of (natural or man-made) fires, in combination with the presence of trampled areas and disturbed grounds and possibly consumption of Nymphaeaceae seeds and tubers.

scholarly journals Cladocera from the Sediment of High Arctic Lake in Svalbard (Norway)

2021 ◽  
Vol 23 (2) ◽  
pp. 13-20
Author(s):  
Vartika Singh ◽  
Sophia Barinova
Keyword(s):  
Hot Spots ◽  
Surface Sediments ◽  
Daphnia Pulex ◽  
High Arctic ◽  
Freshwater Ecosystems ◽  
Climate Conditions ◽  
Chydorus Sphaericus ◽  
Cladoceran Remains ◽  
The Impact ◽  
Palaeoenvironmental Conditions

Abstract The High Arctic Region’s freshwater ecosystems serve as hot spots to study the impact of extreme warming conditions on the biota. The cladoceran remains have been recovered from the surface sediments of a non-marine water body near Ny-Alesund, Svalbard, Norway. The cladoceran (crustaceans) belongs to the Chydorus sphaericus group Frey, 1980 and Daphnia pulex Leydig, 1860. The ecology of the species suggests that they lived in a well-developed ecosystem with Water Quality Class 3. This study has implications for understanding the response of the present-day biota experiencing the changing climate conditions and using these remains for assessing palaeoenvironmental conditions.

scholarly journals Plankton communities in oxbow lakes of the River Vistula (Oświęcim Basin) with bottom sediments heterogeneously contaminated with heavy metals

2013 ◽  
Vol 13 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Joanna Gadzinowska
Keyword(s):  
Heavy Metals ◽  
Bottom Sediments ◽  
Aquatic Ecosystems ◽  
Oxbow Lake ◽  
Oxbow Lakes ◽  
Chemical Parameters ◽  
Zinc Cadmium ◽  
Cadmium Lead ◽  
Lake Waters ◽  
Plankton Communities

Abstract This study presents plankton communities (phytoplankton and zooplankton) in the three reservoirs of the River Vistula’s oxbow lake near Zator (Oświęcim Basin). Selected physicochemical parameters of the oxbow lake waters and the bottom sediments were analysed. Aquatic ecosystems in the investigated area have been heterogeneously contaminated with heavy metals (mostly by zinc, cadmium, lead and chromium), because of contaminated waters of the Vistula, and with manganese and iron. The highest differences were observed between Krajskie and Miejsce oxbow lakes among chlorides and the conductivity of the water and among Cr and Fe in the bottom sediments. This indicates a strong influence of the River Vistula. The plankton structure was different in each of the oxbow lakes. The index of taxa similarity showed also differences in the structure of plankton in oxbow lakes, which was convergent with the chemical parameters of oxbow lakes. The index of taxa similarity was similar for all three oxbow lakes only for one group of algae (Chlorophyta) and one group of plankton animals (Rotatoria). Lower similarity was shown between one oxbow lake impacted by the River Vistula (Krajskie) and another oxbow lake completely separated from the River Vistula (Oko).

scholarly journals To Determine the Structure and Function of Bhagar Oxbow Lake in Dumraon, Buxar, South Bihar, India

2020 ◽  
pp. 145-153
Author(s):  
Suday Prasad ◽  
Subodh Kumar ◽  
Tapan Gorai ◽  
Ajay Kumar
Keyword(s):  
Migratory Birds ◽  
Ph Value ◽  
Biological Properties ◽  
Oxbow Lake ◽  
Oxbow Lakes ◽  
Wild Mammals ◽  
Fisheries Resources ◽  
And Function ◽  
Summer Time ◽  
Percent Area

The paper deals with the structure, function, and fisheries resources of Bhagar lake, South        Bihar, one of the oxbow lakes in Dumraon (un-reported and un-described), from February           2018 to January 2020 under the state non plan research project. This lake is spread from          Nauki par (Chakki) to Nainijore (Brahampur), Dumraon, (Buxar) with a large size wetland in dimension of 20 km length & 1 km width. Bhagar oxbow lake is U shaped, hydrological closed lentic type meander of the Ganga river, it is fed by the monsoon runoff and ingress of flood water from the river Dharmawati. The water depth of lake ranges between 1.5 to 3 meters in summer and depth 4 to 6 meters during the Monsoon months. Water temperature ranged from 16°C (January) to 30°C (August) whereas the pH value of lake water was found within 7.0 to 7.8. In aspect of biological properties of the lake, it was highly infested with submerged vegetation with dominancy of Hydrilla cillata and floating aquatic weeds (water hyacinth) such as Eichhormia crassipes with approximately 30 percent area coverage. This lake is rich sources of fishes with identified forty four species with example of annual fishes like Mystus spp., Puntius spp., Channa spp., Carps spp., small Macrobrachium spp. and several seasonal fishes, providing livelihood support to more than sixty five household, socio-cultural importance. It also gives protection to many wild mammals like Blackbucks (Antelope cervicapra), swamp deer (Rucervus duvaucelii) and Nilgai (Boselaphus tragocamelus) during summer time. This lake is also wintering ground of the migratory birds such as Heron and Crane.

scholarly journals Floodplain sediment from a 30-year-recurrence flood in 2005 of the Ping River in northern Thailand

2007 ◽  
Vol 4 (5) ◽  
pp. 3839-3868 ◽  
Author(s):  
S. H. Wood ◽  
A. D. Ziegler
Keyword(s):  
Fine Sand ◽  
Sediment Concentration ◽  
Main Channel ◽  
River Channel ◽  
Northern Thailand ◽  
Main River ◽  
Main River Channel ◽  
Clayey Silt ◽  
Secondary Objective ◽  
Sedimentation Processes

Abstract. This paper documents the nature of flood-producing storms and floodplain deposition associated with the 28 September–2 October 2005 30-year-recurrence flood on the Ping River in northern Thailand. The primary purpose of the study is to understand the extent that deposits from summer-monsoon floods can be identified in floodplain stratigraphy A secondary objective is to document the sedimentation processes/patterns associated with a large contemporary flood event on a medium-sized Asian river. Maximum sediment depths of 15 cm were found on the river levee, within 30 m of the main channel, and at 350 m thickness was 4 cm. Sediment depth generally decreased exponentially with distance away from the main channel. The extent of sediment deposition was about 1 km from the river channel. However, 72% of the sediment was deposited within an oval-shaped area 200–400 m from the main channel and centered on a tributary stream, through which sediment-laden water entered the floodplain, in addition to overtopping the levee of the main channel. Sediment concentration during the flood was estimated at 800–1500 mg L−1; and we believe the sediment was delivered by flows of well-mixed flood water occurring over a 1–2 day period. These data suggest that flood-deposited strata related to 30-year recurrence floods is only likely to be preserved in deposits located relatively close to the main river channel where fine sand and clayey coarse silt deposits have thicknesses of at least 5–10 cm. These relatively thick deposits would survive bioturbation, whereas more distal areas with thin clayey silt deposits would not.

scholarly journals Reproduction of Hydrocharis morsus-ranae taxa in an oxbow lake of the River Vistula

2013 ◽  
Vol 13 (3) ◽  
pp. 171-179 ◽  
Author(s):  
Cezary Toma
Keyword(s):  
Total Mass ◽  
Reproductive Effort ◽  
Oxbow Lake ◽  
Oxbow Lakes ◽  
Ripe Fruit ◽  
Vegetative Period ◽  
Young Fruit ◽  
Total Length ◽  
Fruit Mass

AbstractThe aim of the research was to establish the density of specimens and shoots as well as the reproductive effort of Hydrocharis morsus-ranae during the whole vegetative period in a Polish oxbow lake. The following specimen features were examined: plant diameter, total length, the number of buds, flowers, young fruit, ripe fruit, turions and leaves and also dry total mass, vegetative mass, generative mass, the bud mass, the flower mass, young fruit mass and ripe fruit mass. The density of Hydrocharis morsus-ranae specimens per square metre ranged from 10 to 170 while the density of shoots ranged from 10 to 545. From one square metre overgrown with Hydrocharis morsus-ranae, a maximum of 389 turions, 50 fruit and 4000 seeds are produced. The maximum of reproductive effort is 97.8% of vegetative mass and 2.2% of generative mass in September 2010. The factors which best explain changeability of the Hydrocharis morsusranae population in time are the length and the diameter of the specimens in the population. Fruiting of Hydrocharis morsus-ranae in Poland is higher than in Canada, where it is an invasive taxon. Hydrocharis morsus-ranae is well adapted to the environment in oxbow lakes of the River Vistula and represents the S-R strategy.

scholarly journals Gill nets selectivity determine the fish community in connected oxbow lakes of the Pantanal

2019 ◽  
Vol 10 (5) ◽  
pp. 295-306
Author(s):  
Claumir Cesar Muniz ◽  
Ernandes Sobreira Oliveira Junior ◽  
Ana Paula Dalbem Barbosa ◽  
Alberto Carvalho Peret
Keyword(s):  
Fish Community ◽  
Temporal Distribution ◽  
Diversity Indices ◽  
Water Dynamics ◽  
Oxbow Lake ◽  
Oxbow Lakes ◽  
Field Equipment ◽  
Gill Nets ◽  
Passive Devices ◽  
Flooded Area

Pantanal is known because of the amplitude on the water dynamics, with a pronounced flood and dry seasons. The water expansion and retraction reflect in the hydric connectivity between river and bays, resembling the environments and causing distinct characteristics of water quality. In order to capture fish in these environments the gill nets are used.  These passive devices allow the capture of a certain length category according to the meshes size, avoiding the capture of fish that are too small or too large, characterizing their selectivity. The present study aims to characterize the ichthyofauna of an oxbow lake system, as well as to establish its relationship with the seasonal, limnology and structural alterations of fish, seeking to understand the spatial and temporal distribution characteristics of the community. Three points of two side lakes were sampled using a set of gill nets with 2, 3, 4 and 5 cm between knots, allocated in parallel columns at every 10 meters in the lakes. The samples were performed during the day and during the night, where the nets were left in the water for 6 hours. Concomitantly to the fish sampling, the limnologic variables were obtained using a portable field equipment and Secchi disk. The results showed that the limnological variables changes according to the hydric seasons. These changes associated to the connectivity between the river and lakes presented an increase in the diversity indices considering the inlet of water in the system, while the disconnected lakes remained about the same during the entire year. This discrepancy may be caused by the selectivity of the gill nets using in the study, where fish may use the flooded area during the high waters, reducing the capture capacity of these devices. In the Pantanal, the connectivity associated to the selectivity of the gill nets determine the fish community.

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