Species Of Rotifera Research Articles

Diversity and Seasonal Variations of Zooplankton in Dudhiya Talab of Sirohi, India

In this study, the seasonal fluctuations of zooplankton and specific physico-chemical parameters were examined in Dudhiya Talab, a significant artificial reservoir located in Sirohi, Rajasthan. During the research period, a total of 41 zooplankton species were identified, comprising 12 species of Rotifera, 14 species of Cladocera, 5 species of Ostracoda, and 4 species of Copepoda. Among these, Rotifera emerged as the predominant group, with a peak abundance of 689 individuals per liter recorded in the summer, while the lowest numbers were noted during the winter season. Additionally, the zooplankton community exhibited correlations with various physico-chemical parameters. The findings of this research suggest that the distribution and density of zooplankton species are significantly affected by the prevailing physical and chemical conditions of the aquatic environment. Key words: Zooplankton, Physico-chemical factors,P Cladocera, Rotifera.

Determination of Kovada Lake water quality according to zooplankton

In this study, between June 2012 and May 2013, zooplankton was sampled seasonally from 4 stations in Kovada Lake and various physicochemicals were measured. In our study, 23 species of Rotifera, 6 species of Claodocera and 3 species of Copepoda, total 32 species were identified. The highest zooplankton density in Kovada Lake was 243353,2 org/m3 in summer season and the lowest was 62132,8 org/m3 in winter season. According to Saprobi and WZI indices, the lake was found to be in mesotrophic water quality. However, the fact that zooplankton species such as K.cochlearis, P.vulgaris from Rotifera, D.longspina, B.longirostris from Cladocera, which are indicators of eutrophic waters, are dominant and frequent species for Kovada Lake is an indication that the trophic level of the lake is going towards eutrophic structure when evaluated in terms of zooplankton.

Uncovering Rotifera, Cladocera and Copepoda name length patterns for enhanced scientific communication.

The motivations for describing species are multifaceted and extend beyond the scientific disciplines, promoting public engagement and enhancing biodiversity communication. We delve into the practices of naming species of Rotifera, Diplostraca (= Cladocera) and Copepoda, underpinning the effects of time, taxon group and the lengths of genus names on the length of specific names. Our investigation revolves around a comprehensive dataset comprising 6319 names described between 1758 and 2021 of Rotifers, Cladocera and Copepoda. The overall annual average hovers around a mean length of slightly over 10 and 8 letters, respectively, for genus names and specific names, although it varied noticeably across taxa. Notably, our findings reveal no substantial temporal variation in the length of specific names over the years of description. We found a positive although not significant relationship between the length of specific and genus names, suggesting that longer genus names may influence the choice of longer specific names. We support the recommendation by the International Commission on Zoological Nomenclature and existing related publications on this topic, to prioritize short names, emphasizing the importance of concise and ultimately the use of mnemonic names assigned to zooplankton species.

Ecological dynamic of fish farming ponds managed during the growth of matrinxã (Brycon amazonicus)

Habitat for organisms in ecosystems include attributes to the ecological significance and resulting from the interactions between its physical, chemical and biological components. In fishponds, one of the important features is the community of the microzooplankton that é key component of marine food webs and food chain in freshwater. An experiment was carried out in an area for fish farming, located in Assis Brasil Village, municipality of Cruzeiro do Sul, State of Acre, aimed to observe the dynamics of fish farming tanks, and the composition and microzooplankton abundance, submitted to two treatments, commercial feed (ad libitum) and tabulated feed. The results showed that environments severely eutrophicated are characterized by high values of phosphorus and nitrogen, and dominance of species of Rotifera, throughout the study. On this basis, it was concluded that researches of this nature contributes for determining the water quality, particularly using potential bioindicator species, that grow excessively in these environments.

Deriner Baraj Gölü Zooplanktonu (Artvin-Türkiye)

This study was carried out seasonally at 8 stations determined in Deriner Dam Lake between 2020 and 2021. In order to determine the seasonal zooplankton taxon diversity and richness at the determined stations, the samples were collected in the surface water with a plankton net with a pore size of 55 µm. In the zooplankton distribution of Deriner Dam Lake, more zooplankton was recorded in autumn and spring seasons compared to other seasons in terms of both the number of species and the number of individuals. Although the number of Rotifera species is high, the most common species in terms of individual numbers belong to the Copepoda group. Asplanchna sieboldi from Rotifera, Acanhopdiaptomus denticornis from Copepoda and Daphnia cucullata from Cladocera were the dominant species of their groups

Zooplankton in the Technogenic Aquatic Ecosystem of the North Crimean Canal, the Longest in Europe

The construction and use of navigation and irrigation canals are among the common human alterations in landscapes and ecosystems. The North Crimean Canal (NCC) is the longest in Europe; its main branch is 403 km, and the total of all its branches exceeds 10,000 km. It is a main driver of the significant environmental changes in an all-arid part of Crimea. No zooplankton studies in the canal have been carried out up to this time at all. In 2022, zooplankton was studied in different sites from May to October. Total zooplankton abundance fluctuated between 170 and 19,560 ind. m−3, and wet biomass between 0.75 and 1057 mg m−3. In total, 11 Rotifera species, 11 Cladocera species, and 15 Copepoda species, including 2 Harpacticoida, 5 Calanoida, and 8 Cyclopoida, were found in plankton. The most common Rotifera species were Brachionus calyciflorus, Euchlanis dilatate, and Keratella cochlearis. Among Cladocera, Chydorus sphaericus, Bosmina longirostris, and Coronatella rectangular have the highest frequency of occurrence. In Copepoda, these were Acanthocyclops vernalis, Eurytemora affinis, and Nitocra typica. Among the 37 species found in NCC, 10 were not previously noted in the water bodies of Crimea. Among rotifers, they were Ploesoma hudsoni, Polyarthra dolichoptera, Pompholyx complanata, Synchaeta grandis, and Synchaeta stylata. Bosminopsis zernowi, Rhynchotalona rostrata, and Scapholeberis mucronata were not noted before among Cladocera. Eurytemora lacustris and Cyclops smirnovi were first found in Crimea among Copepoda. New technogenic aquatic ecosystems such as NCC are the “gateway” for the invasion of alien species into the new regions.

Structure of the Zooplankton Community in Sıddıklı Küçükboğaz Dam Lake, Türkiye: The Importance of Environmental Factors

The zooplankton fauna of Sıddıklı Küçükboğaz Dam Lake, located in Kırşehir city in Turkey, was researched as monthly between September 2015 and August 2016. A total of 24 major zooplankton species was determined. Zooplanktonic organisms were presented by three main groups: Rotifera (75%), Cladocera (21%) and Copepoda (4%). The minimum and maximum number of species were revealed in May (4 species) and April (12 species), respectively. Rotifera was the most abundant taxon dominated mainly by the species Keratella cochlearis, Polyarthra dolichoptera, Asplanchna priodonta and Synchaeta pectinata. Brachionus: Trichocerca quotient value of 1.00 was estimated. This result has clearly showed that the Sıddıklı Küçükboğaz Dam lake is oligotrophic. All species of Rotifera, Cladocera and Copepoda group are new records for this dam lake. The fundamental data of the Sıddıklı Küçükboğaz Dam Lake are provided, and the relationships between zooplankton and environmental parameters have researched in this study. Also, this study was supported by academic basics for monitoring a reservoir in Central Anatolia. Redundancy analysis (RDA) showed that all environmental indicators accounted for 34.1% total variance of zooplankton. Besides, RDA results demonstrated that zooplankton abundance is correlated with biological oxygen demand, water temperature, total suspended solid, ammonium and total ammonia nitrogen.

Fine structure of the retrocerebral organ in the rotifer Trichocerca similis (Monogononta)

AbstractThe retrocerebral organ (RCO) is a complex glandular system that is widely distributed across species of phylum Rotifera (sensu stricto). This system is hypothesized to secrete mucus that aids in benthic locomotion, adhesion, and/or reproduction. Unfortunately, the ultrastructure of the RCO is mostly unknown, having only been partially examined in one species. We used transmission electron microscopy and confocal laser scanning microscopy to describe the RCO in the planktonic freshwater rotifer Trichocerca similis. Results reveal the RCO to be a singular syncytial organ composed of a posterior glandular region, an expansive reservoir, and an anterior duct. The glandular portion has an active synthetic cytoplasm with paired nuclei, abundant rER, ribosomes, Golgi, and mitochondria. Electron‐dense secretion granules accumulate at the anterior end of the gland and undergo homotypic fusion to create larger, more electron‐lucent granules with numerous mesh‐like contents that gradually fuse into tubular secretions that accumulate in the reservoir. Ultrastructure of these secretions suggests they may be hydrated glycoproteins. Cross‐striated longitudinal muscles form a partial sleeve around the reservoir and may function to squeeze the secretions through the single cytoplasmic duct that penetrates the cerebral ganglion. A review of the RCOs from other rotifers suggests that further ultrastructural analyses are required before attempting to discern their functions and homologies.

IMPACT OF SEASONAL CHANGES IN FRESHWATER PHYTOPLANKTON AND ZOOPLANKTON BIODIVERSITY AT VALANKULAM LAKE, COIMBATORE DISTRICT, TAMIL NADU, INDIA

The plankton communities are important source of food for the aquatic organisms, and if any undesirable changes in aquatic environment may affect plankton diversity and density. Therefore, assessment of planktonic communities in the freshwater ecosystems is essential because they serve as bio-indicators of water quality parameters. Hence, the present research was focused to evaluate the freshwater phytoplankton and zooplankton diversity and their abundance in Valankulam Lake (Lat. 10.59° N and Long. 76.57° E), at Coimbatore city, Tamil Nadu, India. Results from the study revealed that a total of 77 species of phytoplankton and zooplankton were recorded, under 37 families and 46 genera. In addition to that, a total of 43 phytoplankton species were recorded under 25 families and 30 genera, (which includes; 15 species of Cyanophyceae, 17 species of Chlorophyceae, 08 species of Bacillariophyceae, 03 species of Euglenophyceae). and a total of 34 species of zooplankton were recorded under 12 families and 17 genera, (which includes 13 species of Rotifera, 09 species of Cladocera, 08 species of Copepoda and 04 species of Ostracoda). The maximum plankton diversity was observed during the monsoon season and the minimum in the summer season. Results from study revealed the ecological status of the lake is categorized as moderately polluted due to the presence of municipal waste and industrial discharges into the lake water. Therefore, the assessment of planktonic communities in water bodies will be useful to monitor and maintain the water quality parameters and wealth of aquatic biota in the aquatic ecosystem.

Современное состояние зоопланктона Малого Моря оз. Байкал (по данным 2022 г.)

Original results of studies of zooplankton in the Maloe More Strait of Lake Baikal in 2022 are presented. Changes in species composition, quantitative indicators of development and the structure of zooplankton in years of different water levels are analyzed. Zooplankton was collected on 5 transects in three depth zones: central about 200 m, coastal – about 10 m, shallow – less than 1 m. At deep-water stations, zooplankton includes 5 species of Rotifera and Cladocera, 2 species of Copepoda and 1 species of Amphipoda. Epischura baikalensis and Cyclops kolensis formed the basis (up to 99% of the total number) of the total population density (up to 2100 ind./m3 ) and biomass (up to 140 mg/m3). Macrohectopus branickii may also constitute a significant portion of the biomass at some stations. Coastal zooplankton is characterized by an increase in taxonomic diversity to 28 species, of which 79% are Rotifera. The population density increases to 115 thousand ind./m3 and biomass to 492 mg/m3, but the structure of zooplankton does not change due to the preservation of the dominant complex of Copepoda. A fundamentally different planktocenosis is formed at shallowwater stations, the taxonomic composition of which includes the same species as in deeper-water zones. However, non-endemic rotifers Synchaeta spp., Keratella cochlearis tecta, Polyarthra dolichoptera and others, which together make up more than 96% of the total number, become systemforming species. Of the endemic species, only the meiobenthic phytophilic crustaceans Chydorus baicalensis and Alona setosocaudata, as well as the rotifers Euchlanis ligulata, Dicranophorus sp., play some role. Zooplankton in the shallow water zone is characterized by a high abundance of up to 425 thousand ind./m3, however, taking into account the dominance of small-sized rotifers, a relatively low biomass – up to a maximum of 154.9 mg/m3. The structure and density of the population of plankton in the deep-water and coastal zones of the transects shows similarity with the zooplankton of the average water level in 2012. The taxonomic composition and quantitative characteristics of the shallow zone correspond to the zooplankton of the most warmed bays of the Maloe More Strait.

Determination of Zooplankton Fauna in the Running Waters of Arsuz District of Hatay Province

Some water quality parameters (salinity, water temperature, conductivity and dissolved oxygen) and zooplankton fauna were investigated in 4 rivers within the borders of Arsuz district of Hatay Province. Forty three (43) species of Rotifera (61.43%), 21 species of Copepoda (30%), and 6 species of Cladocera (8.57%) were recorded. In the study, 15 families from Rotifera were recorded, Lecanidae was the richest family with 12 species, Chydoridae from Cladocera represented by three families was the richest family with 4 species, and Cyclopoidae from Copepoda, represented by 10 families, was the richest family with 8 species. It was observed that Cephalodella gibba, Colurella adriatica, Eucyclops serrulatus and Paracyclops fimbriatus were the most common species recorded in all four running waters. Most species (51 species) were recorded in Arsuz Stream, followed by Gümüşkent stream with 32 species. In the study in which a total of 70 taxa were recorded, only 12 taxa were very abundant (+++) and abundant (++) levels in various seasons and rivers. Only 2 rotifer Brachionus quadridentatus and Lecane hamata were very abundant. There was a significant and positive relationship between zooplankton species diversity, abundance, and water quality parameters.

First trait-based characterization of Arctic ice meiofauna taxa

Trait-based approaches connect the traits of species to ecosystem functions to estimate the functional diversity of communities and how they may respond to environmental change. For the first time, we compiled a traits matrix across 11 traits for 28 species of Arctic ice meiofauna, including Copepoda (Subclass), Nematoda (Phylum), Acoela (Order), Rotifera (Phylum), and Cnidaria (Phylum). Over 50 years of pan-Arctic literature were manually reviewed, and trait categories were assigned to enable future trait–function connections within the threatened ice-associated ecosystem. Approximately two-thirds of the traits data were found at the genus or species level, ranging from 44% for Nematoda to 100% for Cnidaria. Ice meiofauna were shown to possess advantageous adaptations to the brine channel network within sea ice, including a majority with small body widths < 200 μm, high body flexibility, and high temperature and salinity tolerance. Diets were found to be diverse outside of the algal bloom season, with most organisms transitioning to ciliate-, omnivore-, or detritus-based diets. Eight species of the studied taxa have only been recorded within sea ice, while the rest are found in a mixture of sympagic–pelagic–benthic habitats. Twelve of the ice meiofauna species have been found with all life stages present in sea ice. Body width, temperature tolerance, and salinity tolerance were identified as traits with the largest research gaps and suffered from low-resolution taxonomic data. Overall, the compiled data show the degree to which ice meiofauna are adapted to spending all or portions of their lives within the ice.

DIVERSITY AND SEASONAL VARIATIONS OF ZOOPLANKTON IN SOMALAPURA WATER TANKS IN HOSAPETE CITY, KARNATAKA (INDIA)

This study focuses on assessment of zooplankton with special reference to seasonal variation and selected physic-chemical variables of Somalapura water tanks in Hosapete city, Karnataka state. A large quantity of manmade activities near the water tank. During the study period, 48 species of zooplankton - 14 species of Rotifera, 12 species of Cladocera, 6 species of Ostracoda and 4 species of Copepoda were observed. Among zooplankton, Rotifera was (645 no./Org) noticed as the dominant group in the entire the study period and the maximum count was identified in the summer period while less numbers were noticed during winter season. Zooplankton community is also significantly correlated with some physico-chemical variables. The analytical results during the study period indicate that the scattering and density of zooplankton species were encouraged by prevailing physical and chemical features of the aquatic ecological condition. KEYWORDS: Somalapura, water tank, zooplankton, diversity, seasonal and domestic activity

Zooplankton in the temporary recreational pond in microdistrict 13 of Samara

Rotifers make a significant contribution to the self-purification of the water bodies. Full self-purification is especially important for water bodies of recreational zones of settlements. These water bodies are constantly visited by local residents and conditions in these water bodies must comply with sanitary standards and they shouldnt be dangerous to human health. At the same time, the rest of residents on the banks of urban ponds leads to a deterioration in their ecological and sanitary conditions. Therefore, it is necessary to monitor the ecosystems of urban ponds located in recreational areas and among resident buildings. The Rotifera and Crustacea community in the small temporary urban recreational pond in microdistrict 13 of Samara was studied in 2012 and 2018. The pond is situated in the middle of the plot among Kirov avenue, Georgy Dimitrov street, Stara-Zagora street, Moskovskoe highway. 23 Rotifera (13 familia) and 24 Crustacea species (8 familia) have been identified. All species are common for water bodies in the Samara Region. Most of the species live in other ponds of Samara. Brachionidae dominated in the Rotifera community, Cyclopoidae и Daphniidae dominated in the Crustacea. The seasonal dynamics of the population size from May till November was studied. The Rotifers largest abundance in both years was observed in spring and autumn. The crustaceans largest abundance was in 2012 in October, in 2018 in July. The indicator species of Rotifera and Crustacea correspond to the -mesosaprobic zone. While resting people trample grass on the banks, the soil washout causes eutrophication and shallowing of the pond. It is necessary to remove bottom sediments and strengthen the pond banks to improve the state of the pond.

Zooplankton Composition in Super-Intensive Whiteleg Shrimp, Litopenaeus vannamei (Boone, 1931) Culture Tanks

This study aimed to determine the zooplankton species composition in super-intensive whiteleg shrimp, Litopenaeus vannamei (Boone, 1931) tanks. The research was conducted from January to May 2021 in Bac Lieu City, Bac Lieu province, Vietnam. Eleven sampling times were divided into two periods, the nursery phase (six times) and the grow-out phase (five times) of shrimp culture. The results showed that water quality parameters fluctuated dramatically during the culture period, in which some nutrient concentrations tended to increase at the end of the shrimp culture period. Nine zooplankton species were recorded, of which five species belonged to Protozoa, three Rotifera species, and one Copepoda species. The number of zooplankton species did not differ significantly among the sampling periods. Protozoa had the highest species composition and density during most of the shrimp culture period. Copepoda was only identified in the nursery stage of shrimp culture. The species component of zooplankton had a close positive correlation with temperature, but their abundance did not have a significant relationship with water quality parameters because each species was affected by the different water quality parameters. Zoothamnium sp. had significantly positive correlations with total ammonia nitrogen (TAN), nitrate (NO3)-, total phosphorus (TP), and total nitrogen (TN) concentrations. The rotifer Brachionus plicatilis had a strong relationship with TP content, whereas Dartintinnus alderae had a strong relationship with alkalinity. Protozoa dominance in shrimp tanks could affect shrimp growth, decreasing the economic efficiency of shrimp farming. Therefore, the results of this study contribute to water quality and natural food management to improve shrimp productivity.

Effects of Refining and Petrochemical Effluents on Water Quality and Zooplankton Community in River Rido Kaduna, Nigeria

Kaduna Refining and Petrochemical Corporations (KRPC) discharges were studied for a year along the river Rido to determine their impact on water quality and the distribution and abundance of Zooplankton. Physical and chemical parameters were measured following American Public Health Association (APHA) standards for evaluating wastewater. An atomic absorption spectrometer (AAS) was utilized for heavy metal analysis. For this experiment, we used a Plankton net with a 25 m mesh size and a specimen bottle with a 10 cm diameter ring opening to collect zooplankton. Zooplanktons were identified using a standard key and a monograph. Water quality parameters fluctuated, but all were within acceptable ranges except for temperature, conductivity, Total Dissolved Solid, and lead. Zooplanktons were represented in order of abundance by 8 species of protozoa constituting 72.44%, followed by 12 species of Rotifera (10.58%), followed by 13 species of Cladocera 9.55% and then 6 species of Copepoda (7.44%). The planktons showed seasonal variation with high density recorded during the wet season in all the stations. There was a low density of zooplankton in station B, while high density was observed in stations A and D. Also, the low transparency and dissolved oxygen (DO) as well as high mean values of temperature (30.88 oC), chloride (31.88 mg/L), lead (0.099 mg/L), TDS (224.17 mg/L) and conductivity (334.28 µS/cm) observed were above FEPA limits at station B were an indication of pollution and deterioration of water quality. This research revealed that the effluent discharge from KRPC has adverse effects on the zooplankton community and the water quality of river Rido.

Investigation of groundwater zooplankton fauna from water wells in Yayladağ district of Hatay province in Turkey

Some water quality parameters (water temperature, conductivity, dissolved oxygen and pH) and zooplankton fauna were investigated in 10 water wells where the study was conducted. In this study, 14 species of Rotifera (46.67%), 10 species of Copepoda (33.33%), and 6 species of Cladocera (20%) were identified. It was found that the widely distributed species Rotaria neptunia (in 7 wells), Keratella quadrata (in 5 wells), Daphnia curvirostris (in 8 wells), Coronatella rectangula (in 6 wells), Chydorus sphaericus and Pleuroxus aduncus (in 5 wells each), Megacyclops viridis (in 8 wells) and Tropocyclops prasinus (in 6 wells). The most species (14 species) were found in well 8, followed by wells 3, 5, 7 and 9 with 11 species. In general, it was determined that there was a significant and positive relationship between zooplankton species diversity and abundance, and water quality parameters.

Impact of Tharthar Arm on the Composition and Diversity of Rotifera in Tigris River North of Baghdad, Iraq

This study was conducted to evaluate the effects of Tharthar Arm on the composition and diversity of Rotifera in Tigris River. Six sampling sites were selected, two on Tharthar Arm and four along the Tigris River, one before the confluence as a control site and the others downstream of the confluence. Seventy-seven species of Rotifera were identified in Tigris, whereas, 60 in the arm. The results showed that low density of Rotifera in Tharthr Arm decreased the density in Tigris from 239812.4 upstream of the confluence to 223315.5 at immediate downstream of the confluence. It also declined the mean values of richness, evenness and Shannon diversity indices from 5.19, 0.69 and 2.14 bit/Ind., before the confluence to 3.97, 0.73 and 2.00 bit/Ind. below the confluence, respectively. Moreover, the highest similarity value was between sites 1 and 6 reached 83.27%, while the lowest value was between sites 1 and 2 recorded as 60.52%. For constancy index, the highest value was 14 in site 1 and the lowest was 8 in site 2.

ABUNDANCE AND DIVERSITY OF ROTIFERA IN THE GARMAT ALI REGION PONDS, BASRAH-IRAQ.

The study is based on Samples of Rotifera collected from three ponds located inside the University campus, Garmat Ali region Basrah, Iraq. The samples were investigated for the density changes and for the diversity. There were found 26 species of Rotifera belong to 20 genera. The maximum recorded density was (51 ind. / l) which observed in May/2006 at pond 1, whereas the minimum density was (0.6 ind / l) recorded at pond 1 in November/2006. The total density was (225 ind. / l) at pond 1. It was found that the diversity of Rotifera (no. of spp.) is greater at pond 2 and pond 3 compared with pond 1. There were 22 species at pond 2 and pond 3 but only 9 species at pond 1.

Exotic species of rotifers in Mexico

Abstract Mexico is a megadiverse country, with 10% of all known species found within its borders. The CONABIO catalogue registers rotifers as one of the best-studied groups of animals in Mexico, with the number of species recorded representing 18% of the total global rotifer fauna. However, this registry does not record a single exotic species of Rotifera in Mexico. Here, we confirm the presence of six species of exotic rotifers in Mexican inland waters, highlighting the case of Kellicottia bostoniensis, recorded in Mexico since the 1990’s, but never as an exotic species.