scholarly journals Profundal oligochaete faunas (Annelida, Clitellata) in Japanese lakes

Zoosymposia ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. 24-35 ◽  
Author(s):  
AKIFUMI OHTAKA
Keyword(s):  
Trophic Status ◽  
Tubifex Tubifex ◽  
Lumbriculus Variegatus ◽  
Bottom Temperature ◽  
Eutrophic Lakes ◽  
Branchiura Sowerbyi ◽  
Limnodrilus Hoffmeisteri ◽  
Parallel Replacement ◽  
Main Factors ◽  
Japanese Islands

Thirty-eight species of oligochaetes (Annelida, Clitellata) belonging to five families were recorded from profundal bottoms of 50 freshwater lakes on Japanese islands. They were mostly widely distributed species, and the composition of fauna is basically explained by the scheme of Timm (2012), with parallel replacement of European species. Oxygen, temperature and surrounding fauna could be main factors determining the profundal fauna in the lakes. The lumbriculids (Styloscolex japonicus, Yamaguchia toyensis and Lumbriculus variegatus), haplotaxids (Haplotaxis gordioides) and enchytraeids (Marionina klaskisharum) were restricted to several deep and oligotrophic lakes located in Hokkaido and northern Honshu, where Rhyacodrilus komarovi often accompanied them. Limnodrilus hoffmeisteri was the commonest species, occurring irrespective of the trophic status and bottom temperature of the lake. Tubifex tubifex also occurred in wide trophic scale, but it has never been found in shallow eutrophic lakes where the bottom temperature exceeds 15°C, where L. hoffmeisteri, Branchiura sowerbyi and several Aulodrilus species were the main representatives.

scholarly journals Sludge worms species (Oligochaeta: Naididae: Tubificinae) From Different Aquatic Habitat in Baghdad / Iraq

2013 ◽  
Vol 10 (2) ◽  
pp. 269-281 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Water Temperature ◽  
Tubifex Tubifex ◽  
Silty Clay ◽  
Drainage Canal ◽  
Branchiura Sowerbyi ◽  
Ph Values ◽  
Tigris River ◽  
Limnodrilus Hoffmeisteri ◽  
Individual Number ◽  
Study Sites

The present investigation is concerned primarily with sorting and identification of subfamily Tubificinae from River Tigris and some water surface in Baghdad /Iraq . For this purpose six study sites were chosen, including a Al- Kadhemyia drainage canal, North Baghdad; three sites on the shore of River Tigris; in addition to site in Al-Jaish canal , East Baghdad, finally the sixth site was from pond in Al-Zawra'a park , within the center of Baghdad .These sites were characterized by sediment rang from clay, silty-clay to silty with a percentage of organic matter ranged between 0.7% - 9.9% . According to water temperature, salinity and pH values, they were nearly identical in all study sites, the water temperature was ranged through the study period between 12.5 – 300 C , while electrical conductivity and salinity values were ranged beteen 733.5-1227.5 ?s ,which equivalent to 0.469-0.787 ‰ salinity. All sites were slightly alkaline ,so the pH values were ranged between 7.5-8.1. 3628 individuals were sorted from 24 samples collected from different study sites.. Twelve species were identified belonging to seven genera, including , Limnodrilus hoffmeisteri, L. claparedeianus, .L. profundicola, . L.udekemianus , L. silvani, Tubifex tubifex, Branchiura sowerbyi, Potamothrix. 2013 )2( ???? ????? ?????? ???? 10 982 bavaricus, , P. hammoniensis, Psammoryctide moravicus, Monopylephorus irroratus, and Rhyacodrilus coccineus. The result revealed that Al-Jaish canal and Tigris River / al-Sarafyia were considered as the richest sites according to the number of species recorded, where 8 species were recorded in each of them, but Al-Jaish canal had higher individual number of 1346 individuals , followed by Al-Kadhemyia drainage canal recorded only three species with high total individual number of 606 individual. The lowest total individual number was recorded in Tigris River / Al- Zaafaranyia of 326 individual. L. hoffmeisteri, records higher individuals number of 1870 individual , followed by B. sowerbyi which records 946 individual. Both species recorded highest percentage occurance of 100% followed by 79.16% recorded by L. profundicola. High densities of Tubificinae were recorded during all study period. The highest density was during March-April, reached between 2109 -534.9 ind/m2 in Tigris River sites , 7270.5 ind/m2 in Al-Jaish canal and 2419.8 ind/m2 in Al-Zawra'a pond. The .results of relative abundance revealed that L. hoffmeisteri was the dominant species in site Tigris River/Al- Jaderyia, and abundant in other study sites. B. sowerbyi was abundant in all study sites, while other species were recorded between few to rare species except L. udekemianus which was abundant in site Al-Jaish canal, and T. tubifex in site Tigris River / Al- Zaafaranyia.

scholarly journals Observations on the life cycles of aquatic Oligochaeta in aquaria

Zoosymposia ◽  
2020 ◽  
Vol 17 (1) ◽  
pp. 102-120
Author(s):  
TARMO TIMM
Keyword(s):  
Room Temperature ◽  
Elevated Temperatures ◽  
Life Cycles ◽  
Tubifex Tubifex ◽  
Lumbriculus Variegatus ◽  
Limnodrilus Hoffmeisteri ◽  
Mass Cultures ◽  
Potamothrix Hammoniensis ◽  
Observation Period ◽  
Made In

Observations on the life cycles of aquatic oligochaetes were made in the period 1962–2017 at the Võrtsjärv Limnological Station (Estonia) using small aquaria with sieved profundal mud covered with unaerated water. The aquaria were mostly inseminated with 10 juvenile worms and checked four times a year, changing the mud and eliminating the progeny, until the natural death of the original worms. Besides, mass cultures were kept in bigger aquaria. Many individuals of Tubifex tubifex, T. newaensis, Limnodrilus hoffmeisteri, L. udekemianus, Ilyodrilus templetoni, Psammoryctides barbatus, Spirosperma ferox, Potamothrix moldaviensis, P. vejdovskyi, P. bavaricus, Stylodrilus heringianus and Rhynchelmis tetratheca survived for several years, reproduced repeatedly, and died out one by one during the observation period. In some cases, the most longevous individuals reached an age of up to 8 years (I. templetoni), 10–12 years (T. tubifex), 15–17 years (L. hoffmeisteri, P. barbatus, S. heringianus), or even more than 20 years (L. udekemianus, S. ferox, T. newaensis). Criodrilus lacuum did not reproduce in aquaria, although the oldest individual spent 46 years there. Potamothrix hammoniensis, Lophochaeta ignota, Lamprodrilus isoporus, most naidines and some others did not thrive in aquaria and usually died without reproducing. In a cellar, where temperature conditions imitated seasonal fluctuations in lakes, or when the aquaria were maintained at continuously low temperature, the lifetime of worms was often longer than at room temperature. At elevated temperatures (+25° to +35°C) T. tubifex and L. hoffmeisteri formed cocoons mostly with only 1–2 eggs while their life span was then shorter. Architomic clones of Potamothrix bedoti, Bothrioneurum vejdovskyanum, Aulodrilus pluriseta and A. japonicus survived and propagated for years. The architomic Lumbriculus variegatus was thriving only when fed, e.g., with yeast. Uniparental reproduction by parthenogenesis was observed in T. tubifex, L. hoffmeisteri and S. heringianus kept or reared single. Two special races(?) were noted both within T. tubifex and L. udekemianus.

scholarly journals Genetic Diversity of Small Eukaryotes in Lakes Differing by Their Trophic Status

2005 ◽  
Vol 71 (10) ◽  
pp. 5935-5942 ◽  
Author(s):  
Marie Lefranc ◽  
Aurélie Thénot ◽  
Cécile Lepère ◽  
Didier Debroas
Keyword(s):  
Trophic Status ◽  
Eutrophic Lake ◽  
Rrna Genes ◽  
Eutrophic Lakes ◽  
Massif Central ◽  
Operational Taxonomic Units ◽  
Single Clone ◽  
18S Rrna Genes ◽  
Lake Pavin ◽  
Environmental Sequences

ABSTRACT Small eukaryotes, cells with a diameter of less than 5 μm, are fundamental components of lacustrine planktonic systems. In this study, small-eukaryote diversity was determined by sequencing cloned 18S rRNA genes in three libraries from lakes of differing trophic status in the Massif Central, France: the oligotrophic Lake Godivelle, the oligomesotrophic Lake Pavin, and the eutrophic Lake Aydat. This analysis shows that the least diversified library was in the eutrophic lake (12 operational taxonomic units [OTUs]) and the most diversified was in the oligomesotrophic lake (26 OTUs). Certain groups were present in at least two ecosystems, while the others were specific to one lake on the sampling date. Cryptophyta, Chrysophyceae, and the strictly heterotrophic eukaryotes, Ciliophora and fungi, were identified in the three libraries. Among the small eukaryotes found only in two lakes, Choanoflagellida and environmental sequences (LKM11) were not detected in the eutrophic system whereas Cercozoa were confined to the oligomesotrophic and eutrophic lakes. Three OTUs, linked to the Perkinsozoa, were detected only in the Aydat library, where they represented 60% of the clones of the library. Chlorophyta and Haptophyta lineages were represented by a single clone and were present only in Godivelle and Pavin, respectively. Of the 127 clones studied, classical pigmented organisms (autotrophs and mixotrophs) represented only a low proportion regardless of the library's origin. This study shows that the small-eukaryote community composition may differ as a function of trophic status; certain lineages could be detected only in a single ecosystem.

scholarly journals Checklist of Aquatic Oligochaetes Species in Tigris–Euphrates River basin

2014 ◽  
Vol 11 (3) ◽  
pp. 1397-1404 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Single Species ◽  
Abundant Species ◽  
Tubifex Tubifex ◽  
Euphrates River ◽  
Tigris River ◽  
Limnodrilus Hoffmeisteri ◽  
Frequent Species ◽  
Aquatic Oligochaetes ◽  
Stylaria Lacustris ◽  
Tubificid Worms

A total of 60 species of aquatic oligochaetes were identified in different sites within Tigris-Euphrates basin / Iraq, including River Tigris, River Euphrates, Southern marshes ( Al-Haweiza , Al-Hammar and Al-Chebaiesh ) , Shutt Al-Germa, and Shatt Al-Arab. In River Euphrates 39 species were identified, 40 species from River Tigris and 32 species from Shatt-Al-Arab and southern marshes.The identified species were classified as four species of Family Aeolosomatidae, 54 species of Naididae ( 31 Naidinae , 8 Pristininae and 15 Tubificid worms), one species of each of Lumbriculidae ( Lumbriculus variegates ) and Lumbricidae ( Eiseiella tetraedra). Among Aeolosomatidae , Aelosoma aquaternarium, A. Liedyi, A. variegatum and A. hemprichi, in which, A. variegatum was the most frequent species, found in Euphrates river. Naidinae community were represented by five species of genus Chaetogaster, two species of each of Paranais, Slavina, & Stylaria, four species of Allonais , and seven species of each of Dero and Nais, in addition to Stephensoniana trivandrana, Specaria josinae and Ophidonais serpentina. Nais variabilis was the most abundant and frequent species in River Tigris while Stylaria lacustris & Ophidonais serpentina are abundant in River Euphrates . Species of Pristininae were representative by four species of genus Pristina and three species of genus pristinella, among them Priatina longiseta is the most abundant species.Tubificid worms, Branchuira sowerbyi and Limnodrilus hoffmeisteri were the most frequent and abundant species in the surface sediments of Iraqi waters. Beside L. hoffmeisteri , other five species of Limnodrilus, two species of Potomothrix, and a single species of Tubifex tubifex , Embolocephalus velutinus, Aulodrilus piguetia, Psammoryctides moravicus and Rhyacodrilus coccineus were recorded.

scholarly journals Spatial and Seasonal Variations in the Abundance of Nitrogen-Transforming Genes and the Microbial Community Structure in Freshwater Lakes with Different Trophic Statuses

2019 ◽  
Vol 16 (13) ◽  
pp. 2298 ◽  
Author(s):  
Yu Wan ◽  
Xiaohong Ruan ◽  
Jie Wang ◽  
Xiaojun Shi
Keyword(s):  
Microbial Community ◽  
Trophic Status ◽  
Lake Taihu ◽  
Quantitative Polymerase Chain Reaction ◽  
Amoa Gene ◽  
Functional Markers ◽  
Ammonia Oxidizing Bacteria ◽  
Eutrophic Lakes ◽  
Nirs Gene ◽  
Transforming Genes

Identifying nitrogen-transforming genes and the microbial community in the lacustrine sedimentary environment is critical for revealing nitrogen cycle processes in eutrophic lakes. In this study, we examined the diversity and abundance of ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), denitrifying bacteria (DNB), and anammox bacteria (AAOB) in different trophic status regions of Lake Taihu using the amoA, Arch-amoA, nirS, and hzo genes as functional markers. Quantitative Polymerase Chain Reaction (qPCR) results indicated that the abundance of the nirS gene was the highest, while the amoA gene had the lowest abundance in all regions. Except for the primary inflow area of Lake Taihu, Arch-amoA gene abundance was higher than the hzo gene in three lake bays, and the abundance of the nirS gene increased with decreasing trophic status. The opposite pattern was observed for the amoA, Arch-amoA, and hzo genes. Phylogenetic analyses showed that the predominant AOB and AOA were Nitrosomonas and Nitrosopumilus maritimus, respectively, and the proportion of Nitrosomonas in the eutrophic region (87.9%) was higher than that in the mesotrophic region (71.1%). Brocadia and Anammoxoglobus were the two predominant AAOB in Lake Taihu. Five novel unknown phylotypes of AAOB were observed, and Cluster AAOB-B was only observed in the inflow area with a proportion of 32%. In the DNB community, Flavobacterium occurred at a higher proportion (22.6–38.2%) in all regions, the proportion of Arthrobacter in the mesotrophic region (3.6%) was significantly lower than that in the eutrophic region (15.6%), and the proportions of Cluster DNB-E in the inflow area (24.5%) was significantly higher than that in the lake bay (7.3%). The canonical correspondence analysis demonstrated that the substrate concentration in sedimentary environments, such as NOx--N in the sediment, NH4+-N in the pore water, and the total organic matter, were the key factors that determined the nitrogen-transforming microbial community. However, the temperature was also a predominant factor affecting the AOA and AAOB communities.

Trophic Relationships in Freshwater Pelagic Ecosystems

1986 ◽  
Vol 43 (8) ◽  
pp. 1571-1581 ◽  
Author(s):  
Donald J. McQueen ◽  
John R. Post ◽  
Edward L. Mills
Keyword(s):  
Food Web ◽  
Trophic Status ◽  
Size Structure ◽  
Trophic Relationships ◽  
Top Down ◽  
Eutrophic Lakes ◽  
Bottom Up ◽  
Coefficients Of Variation ◽  
Step Down ◽  
Pelagic Ecosystems

Relative impacts of bottom-up (producer controlled) and top-down (consumer controlled) forces on the biomass and size structure of five major components of freshwater pelagic systems (piscivores, planktivores, zooplankton, phytoplankton, and total phosphorus availability) were estimated. Predictions that emerge are (1) maximum biomass at each trophic level is controlled from below (bottom-up) by nutrient availability, (2) this bottom-up regulation is strongest at the bottom of the food web (i.e. phosphorus → phytoplankton) and weakens by a factor of 2 with each succeeding step up the food web, (3) as energy moves up a food web, the predictability of bottom-up interactions decreases, (4) near the top of the food web, top-down (predator mediated) interactions are strong and have low coefficients of variation, but weaken with every step down the food web, (5) variability around the bottom-up regressions can always be explained by top-down forces, and (6) interplay between top-down and bottom-up effects changes with the trophic status of lakes. In eutrophic lakes, top-down effects are strong for piscivore → zooplankton, weaker for planktivore → zooplankton, and have little impact for zooplankton → phytoplankton. For oligotrophic lakes, the model predicts that top-down effects are not strongly buffered, so that zooplankton → phytoplankton interactions are significant.

scholarly journals Comparative studies of underwater light regimes in lakes of the East-Suwałki Lakeland

2016 ◽  
Vol 16 (4) ◽  
pp. 173-183 ◽  
Author(s):  
Dariusz Borowiak ◽  
Magdalena Borowiak
Keyword(s):  
Optical Properties ◽  
Attenuation Coefficient ◽  
Suspended Solids ◽  
Trophic Status ◽  
Thermal Conditions ◽  
Secchi Disc ◽  
Eutrophic Lakes ◽  
Light Regimes ◽  
Interannual Fluctuations

Abstract Secchi disc transparency and optical properties of water, based on measurements for downward irradiance using an underwater radiometer PER-700, were studied in 23 lakes of the Suwałki Landscape Park (SLP) in 2013. Measurements of optically significant constituents of water were also performed (YSI EXO-2) and analysed. Data on water transparency from published studies were used to assess long-term changes in the optical conditions in the deepest water body in Poland – Lake Hańcza. In terms of the optical characteristics of the water, the analysed SLP lakes can essentially be divided into two distinct groups representing different optical lake types. These are optical categories of lakes most common in Poland, namely types II and IIIb. Regional equations describing the relationships between the attenuation coefficient for downward irradiance as well as optically significant constituents of water were developed. The optical properties of the SLP lakes are mainly affected by suspended solids, mostly phytoplankton. Interannual fluctuations in Sechi disc transparency, as well as the attenuation coefficient for downward irradiance and other apparent optical properties of mid-summer water calculated from it, are determined by the spring thermal conditions and intensity of phytoplankton blooms during this period. Application of the attenuation coefficient for downward irradiance as a criterion for the assessment of the trophic status of the SLP lakes indicates that these are generally eutrophic lakes. The largest and deepest lakes of the park, however, are mesotrophic. Lake Hańcza is currently in the stage of α-mesotrophy.

scholarly journals Rotifer communities of religious water bodies of Haryana (India): Biodiversity, distribution and ecology

2014 ◽  
Vol 6 (2) ◽  
pp. 729-737
Author(s):  
Anita Bhatnagar ◽  
Pooja Devi
Keyword(s):  
Trophic Status ◽  
Water Bodies ◽  
Environment Change ◽  
Regional Environment ◽  
Keratella Cochlearis ◽  
Factors Affecting ◽  
Main Factors ◽  
Distribution And Ecology ◽  
Specific Species ◽  
Rotifer Communities

The rotifer communities of eight religious water bodies of Haryana characterized by different trophic status reveal 44 species belonging to 15 genera and 12 families, represent the richest biodiversity of rotifers. Brachionus, Asplanchna and Keratella genus were found to be pollution tolerant species and common at all the selected water bodies viz., Brahmsarovar and Jyotisar at Kurukshetra; Saraswati tirth, Pehowa; Kapalmochan, Yamunanagar; Phalgu tirth, Kaithal; Banganga tirth , Dayalpur; Pandu Pindara, Jind and Kultarn Tirth, Kirmach. whereas Gastropus, Testudinella, Monostyla clasterocerca, Lecane arcula, Filina terminalis were found to be specific at Brahmsarovar (site 1); Filinia longiseta at Phalgu (site 2); Lecane ploenensis, Euchlanis dilata at Pehowa (site 3); B. budapestinensis, B. nilsoni, Asplanchna brightwelli, Asplanchna sieboldii, Polyurthera were specific to Kirmach (site 4); Monostyla decipiens, Anauraepsis nevicula at Jyotisar (site 5); Trichocera porcellus at Kapal mochan (site 7); Keratella cochlearis, Trichocera capucina were found to be specific at the BanGanga (site 8,). However, no specific species appeared at Pandu Pindara (site 6). Seasonal variations were also observed at all the sites during spring, monsoon, post monsoon and in winters. A positive correlation of rotifer abundance was observed with temperature (r = 0.356, P < 0.05), BOD (r = 0.413, P < 0.05) and Ammonia (r = 0.378, P < 0.05) whereas a negative correlation was observed with DO (r = -0.385, P < 0.05) showing that these were the main factors affecting the richness, diversity and density of rotifers. The rotifer communities of each site can be reconstructed from the tables and figures making this inventory an important benchmark for evaluating future regional environment change.

scholarly journals Preliminary survey of aquatic oligochaetes in Eastern Tamil Nadu, India

Zoosymposia ◽  
2014 ◽  
Vol 9 (1) ◽  
pp. 14-23 ◽  
Author(s):  
MOHAMMED IBRAHIM NAVEED ◽  
S. THULASIRAJA ◽  
S. KARUNAKARAN ◽  
C. KULANDAIVEL ◽  
R. TAMIL SELVAN
Keyword(s):  
Tamil Nadu ◽  
Aquatic Vegetation ◽  
Preliminary Survey ◽  
Aquatic Habitats ◽  
Branchiura Sowerbyi ◽  
Limnodrilus Hoffmeisteri ◽  
Aquatic Oligochaetes ◽  
The Family ◽  
Dero Digitata ◽  
Random Survey

A random survey of aquatic Oligochaeta was conducted in Chennai, Villupuram, Dindugal, Thiruvallur, and Sivagangai districts of Tamil Nadu from November 2010 to March 2012. Thirteen taxa were identified from a total of 644 aquatic oligochaetes examined from various qualitative samples of aquatic vegetation and sediments. Chennai district had 3 families: Naididae, Pristinidae and Tubificidae along with a polychaete. The naidids were most diverse with 5 species: Branchiodrilus semperi, Aulophorus furcatus, Dero digitata, Dero indica and Dero zeylanica, the pristinids were represented by Pristina brevichaeta and Pristina jenkinae and the tubificids by 2 species, Branchiura sowerbyi and Limnodrilus hoffmeisteri. The nine aquatic oligochaetes collected from Chennai were already reported from this region. Two naidids, Branchiodrilus semperi and D. indica, along with the tubificid Branchiura sowerbyi, were collected from Villupuram district and they constitute the first reports for that district. Limnodrilus udekemianus from Kodaikanal, Dindugal district constitutes the first report for that region of Tamil Nadu. Megadriles belonging to the family Octochaetidae (Dichogaster bolaui?) and unidentified Megascolecidae collected from Thiruvallur and Sivaganga districts respectively were found to occur in aquatic habitats.

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