scholarly journals Distribution of freshwater Mollusca in Koothaippar wetland ecosystem Tiruchirappalli District Tamil Nadu

2020 ◽  
Vol 13 (2) ◽  
pp. 091-098
Author(s):  
R. Ranjani ◽  
A. S. Maheswari
Keyword(s):  
Tamil Nadu ◽  
Wetland Ecosystem ◽  
Animal Group ◽  
Wetland Ecosystems ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Molluscan Fauna ◽  
Scientific Attention ◽  
Lamellidens Corrianus ◽  
Bellamya Bengalensis

Freshwater Mollusca form an important animal group of the wetland ecosystems. The distribution and availability in terms of number of species needs scientific attention. Present study is an attempt to document the available Molluscan forms in Koothaippar wetlands of Tiruchirappalli District. This study was carried out between summer 2013 to post-monsoon 2017. Nine species were recorded and among them 6 species belong to Gastropoda representing 2 orders, 3 families, 3 genera while 3 species were bivalves representing 1 order, 1 family and 2 genera. Bellamya bengalensis, Lamellidens marginalis and Pila globosa were the predominantly present molluscan fauna and are distributed throughout the year. Five species of Molluscan fauna (Pila virens, Pila scutata, Bellamya dissimilis, Indoplanorbis exustus and Lamellidens corrianus) are less abundant and Parreysia favidens was found to be rare species of the ecosystem. These Molluscan forms, representing different families ranging from 34% of Ampullariidae, 33% of Unionoida, 22% of Viviparoidae and 11% of Planorbidae. Percent distribution of these shelled organisms indicate that they represent 3 orders viz., 56% of Architaenioglossa, 33% of Unionoida and 11% of Hygrophila.

scholarly journals Trematode cercariae infections in freshwater snails of Chitwan district, central Nepal

2011 ◽  
Vol 7 (9) ◽  
pp. 9-14 ◽  
Author(s):  
Ramesh Devkota ◽  
Prem Bahadur Budha ◽  
Ranjana Gupta
Keyword(s):  
Freshwater Snail ◽  
Temporary Ponds ◽  
Freshwater Snails ◽  
Snail Species ◽  
Double Infection ◽  
Melanoides Tuberculata ◽  
Central Nepal ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Bellamya Bengalensis

Because Nepal has been virtually unexplored with respect to its trematode fauna, we sampled freshwater snails from grazing swamps, lakes, rivers, swamp forests, and temporary ponds in the Chitwan district of central Nepal between July and October 2008. Altogether we screened 1,448 individuals of nine freshwater snail species (Bellamya bengalensis, Gabbia orcula, Gyraulus euphraticus, Indoplanorbis exustus, Lymnaea luteola, Melanoides tuberculata, Pila globosa, Thiara granifera and Thiara lineata) for shedding cercariae. A total of 4.3% (N=62) infected snails were found, distributed among the snail species as follows (B. bengalensis - 1, G. orcula - 11, G. euphraticus - 8, I. exustus - 39, L. luteola - 2 and T. granifera - 1). Collectively, six morphologically distinguishable types of trematode cercariae were found: amphistomes, brevifurcate-apharyngeate (likely mammalian schistosomes), clinostome, gymnocephalus (likely fasciolid), longifurcate-pharyngeate and xiphidiocercaria. I. exustus had the highest prevalence of trematode infection, and harbored all the noted cercarial types except gymnocephalus cercariae. One double infection (xiphidiocercaria and longifurcate-pharyngeate cercaria) was found in this snail. Amphistome cercariae were common in G. euphraticus, G. orcula, and I. exustus. The highest prevalence of infection (38.3%) was recorded among snails collected from temporary ponds.DOI: http://dx.doi.org/10.3126/hjs.v7i9.2183 Himalayan Journal of Sciences Vol.7 Issue 9 2011 pp.9-14

MOLLUSCAN DIVERSITY WITH PARTICULAR EMPHASIS TO SNAILS IN DISTRICT GAUTAM BUDH NAGAR (U.P.) INDIA

2018 ◽  
Vol 24 (2) ◽  
Author(s):  
LOMESH KUMAR TYAGI
Keyword(s):  
Lymnaea Stagnalis ◽  
The Other ◽  
Marked Variation ◽  
Melanoides Tuberculata ◽  
Pila Globosa ◽  
Indoplanorbis Exustus ◽  
Molluscan Diversity ◽  
Radix Auricularia ◽  
Molluscan Species ◽  
Bellamya Bengalensis

Present investigation reveals molluscan diversity of the 4 selected sites viz., Tilpata Karanbas, Manhcha, Latifpur and Atta Gujran in the vicinity of district Gautam Budh Nagar (U.P.). As many as 22 species of molluscs under 9 families were collected. There were 19 species of snails viz ., Bellamya bengalensis , B. dissimilis , B. crassa , Lymnaea ( Pseudosuccinea ) acuminata f. hians , L. luteola f. ovalis , L. acuminata f. patula , L . ( Radix ) auricularia , L . ( Lymnaea ) stagnalis , L . acuminata f. gracilior , Pila globosa , Indoplanorbis exustus , Gyraulus convexiculus , G. pankongensis , Planorbis planorbis var. tangitarensis , Hydrobioides nassa, Thiara ( Melanoides ) tuberculata , Thiara ( Thiara ) scabra, T. ( M .) trigrina and Brotia ( Antimelania ) costula under 6 families. The other molluscs were Parreysia ( Parreysia ) favidens , Corbicula striatella and Lamellidens marginalis . There has been a marked variation in the composition of molluscan species collected from different habitats.

Combining remote sensing and eddy covariance data to monitor the gross primary production of an estuarine wetland ecosystem in East China

2015 ◽  
Vol 17 (4) ◽  
pp. 753-762
Author(s):  
Mingquan Wu ◽  
Shakir Muhammad ◽  
Fang Chen ◽  
Zheng Niu ◽  
Changyao Wang
Keyword(s):  
Remote Sensing ◽  
Primary Production ◽  
Eddy Covariance ◽  
Gross Primary Production ◽  
Model Performance ◽  
Wetland Ecosystem ◽  
Wetland Ecosystems ◽  
New Model ◽  
Estuarine Wetland ◽  
Better Than

A new model performance better than the MODIS GPP product for wetland ecosystems was proposed and validated.

scholarly journals Analysis of Spatiotemporal Dynamic and Bifurcation in a Wetland Ecosystem

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Yi Wang ◽  
Min Zhao ◽  
Hengguo Yu ◽  
Chuanjun Dai ◽  
Debing Mei ◽  
...  
Keyword(s):  
Species Interactions ◽  
Theoretical Basis ◽  
Steady States ◽  
Wetland Ecosystem ◽  
Dynamic Complexity ◽  
Wetland Ecosystems ◽  
Dynamical Behaviors ◽  
Spatial Regularity ◽  
Standard Parameter ◽  
The Stability

A wetland ecosystem is studied theoretically and numerically to reveal the rules of dynamics which can be quite accurate to better describe the observed spatial regularity of tussock vegetation. Mathematical theoretical works mainly investigate the stability of constant steady states, the existence of nonconstant steady states, and bifurcation, which can deduce a standard parameter control relation and in return can provide a theoretical basis for the numerical simulation. Numerical analysis indicates that the theoretical works are correct and the wetland ecosystem can show rich dynamical behaviors not only regular spatial patterns. Our results further deepen and expand the study of dynamics in the wetland ecosystem. In addition, it is successful to display tussock formation in the wetland ecosystem may have important consequences for aquatic community structure, especially for species interactions and biodiversity. All these results are expected to be useful in the study of the dynamic complexity of wetland ecosystems.

scholarly journals Assessment of Ecosystem Service Value of the Liaohe Estuarine Wetland

2018 ◽  
Vol 8 (12) ◽  
pp. 2561 ◽  
Author(s):  
Lifeng Li ◽  
Fangli Su ◽  
Mark T. Brown ◽  
Haisheng Liu ◽  
Tieliang Wang
Keyword(s):  
Comprehensive Evaluation ◽  
Human Society ◽  
Wetland Ecosystem ◽  
Ecosystem Service Value ◽  
Wetland Ecosystems ◽  
Service Value ◽  
Estuarine Wetland ◽  
Emergy Theory ◽  
And Storage ◽  
Flood Diversion

The functions and services of wetland ecosystems to human society have been generally recognized. Currently, most evaluations of wetlands are a comprehensive evaluation of their ultimate value. It is rare to discuss for energy and matter lost and transferred. In this study, emergy theory was used to assess the ultimate and intermediate service values of the Liaohe estuarine wetland ecosystem. Results show that its ultimate service value was $28.2 million, and its intermediate service value was $35,614.03 million. The 1263 time difference between intermediate and ultimate value shows that much server value was dissipated in the form of energy. In the ultimate service value, the value of adjusting the atmosphere was $8.02 million, accounting for 28.45% of the total value, and flood diversion and storage value was $6.98 million, accounting for 24.75%. These results illustrate that the most important service value of the Liaohe estuarine wetland ecosystem is to adjust the atmosphere and divert and store floods. In intermediate service value, maintaining-biodiversity value was $34,182 million, accounting for 95.98% of total value, showing that the Liaohe estuarine wetland plays an important role in species resources and regional seed banks.

scholarly journals Community structure and systematic study of Helminth parasites of freshwater snails of the Chittagong University Campus

2016 ◽  
Vol 44 (1) ◽  
pp. 9-30
Author(s):  
Mahabuba Hasnath ◽  
Md Abdul Gofur Khan
Keyword(s):  
Community Structure ◽  
Developmental Stages ◽  
Freshwater Snails ◽  
Helminth Parasites ◽  
University Campus ◽  
Parasite Diversity ◽  
Pila Globosa ◽  
Low Prevalence ◽  
High Parasite ◽  
Bellamya Bengalensis

In all, 13 parasite taxa - eight cercariae, three nematodes, one rhabdocoel and one aspidogastrean - were recorded from 205 out of the 642 snails autopsied. Of the carcariae, xiphidiocercous was the most diversified (five taxa), followed by the echinostome (two) and the furcocercous (one). Infection by the nematodes, though rather poor in diversity, was much higher (23.99%) than that (12.15%) by the developmental stages of Trematoda. The rhabdocoel and the aspidogastrean were minor infestors having 1.56% and 2.80% prevalence, respectively. Bellamya bengalensis was the most abundant host, had the highest parasite diversity (12 taxa) and also the highest prevalence of infection (51.59%). Though the second highest abundant host, Paludomus blanfordiana had the least parasite diversity (only an oxyurid nematode) and a very low prevalence (2.04%) as well. Brotia costula, the big strong snail harboured two taxa (a carcaria and a nematode), and also had a low prevalence (8.65%). The amphibious Pila globosa, though least abundant among the four hosts, had moderately high parasite diversity (four carcariae and two nematodes) and prevalence (40.26%).Bangladesh J. Zool. 44(1): 9-30, 2016

scholarly journals Status of Biodiversity at Wetland Ecosystem of Mohangonj Upazila in Netrakona District

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Mohammad Zahangeer Alam
Keyword(s):  
Ecosystem Services ◽  
Species Conservation ◽  
Human Beings ◽  
Wetland Ecosystem ◽  
Environmental Pressures ◽  
Wetland Ecosystems ◽  
Environmental Threats ◽  
Sustainable Environment ◽  
Total Percentage ◽  
Wetland Biodiversity

Species in wetlands provide ecosystem services, and protect the sustainable environment for human beings. The wetland biodiversity has been impacted at Mohangonj in Bangladesh due to the development of major environmental threats. The present research is undertaken to report the species status, wetland properties, and major environmental pressures in each wetland ecosystem. Among the recorded species, the total percentage of visible, threatened, endangered, and extinct species was 69.23, 18.62, 10, and 1.92% in these wetland ecosystems, respectively. The highest number of threatened species was found in the wetland of Aizda (29%); the lowest was in Khalaura (8%). The maximum number of endangered species was noted in the wetland of Sonarthal (16%), and the minimum was in Chadra (4%) wetland. Four percent species were in the extinct category at some of the wetland ecosystems. Wetland biodiversity protects wetland ecosystem services and the sustainable environment for species conservation. Continuous monitoring of wetland biodiversity might be helpful for the conservation of species in the wetland ecosystem.

scholarly journals The Influence of Paddy Fields toward The Seasonal Herbaceous Wetland Ecosystem in Rawa Pening Lake

2020 ◽  
Vol 20 (2) ◽  
pp. 256
Author(s):  
Desti Christian Cahyaningrum
Keyword(s):  
Diversity Index ◽  
Similarity Index ◽  
Paddy Fields ◽  
Wetland Ecosystem ◽  
Natural Ecosystems ◽  
Wetland Ecosystems ◽  
Wiener Diversity Index ◽  
Composition And Structure ◽  
Quantitative Descriptive ◽  
Observation Method

Most of the tidal land in the lakeside of Rawa Pening is currently used for rice farming activities. This activity is thought to have negative impacts on seasonal herbaceous wetland ecosystem in this region. The study aimed to analyze the influence paddy fields toward the seasonal herbaceous wetland ecosystems in Rawa Pening Lake through an vegetation composition and structure approach. This study is a quantitative descriptive research with field observation method. Data of vegetation was collected using line intercept transect technique in the area widely of 625 m2 for each affected and unaffected ecosystem sample. Data analysis was performed by calculating the Sorensen Similarity Index (IS), the Margalef Diversity Index (R), the Shanon-Wiener Diversity Index (H'), the Dominance Index (C), and the Evenness Index (E). The results showed that there were differences in the composition and structure of vegetation on the two ecosystem samples, seen from the value of similarity index (IS) between both of them that included in the low criteria (39.85%). The results also showed that the Shanon-Wiener Diversity Index (H') and the Margalef Diversity Index (R) on the affected ecosystem sample  (H' = 1,9834; R = 1,825) are lower when compared to the unaffected ecosystem sample (H'= 2,1297; R = 2,112). So it can be concluded that the existence of paddy fields has changed the composition and structure of vegetation and reduced the diversity of vegetation in the affected ecosystem. Based on these conclusions, it is recommended to construct a sustainable management system of paddy fields on Rawa Pening Lake's tidal land as the effort for natural ecosystems maintenance in this region, especially in the biodiversity and ecological services preservation.

scholarly journals Mapping of West Siberian taiga wetland complexes using Landsat imagery: implications for methane emissions

2016 ◽  
Vol 13 (16) ◽  
pp. 4615-4626 ◽  
Author(s):  
Irina Evgenievna Terentieva ◽  
Mikhail Vladimirovich Glagolev ◽  
Elena Dmitrievna Lapshina ◽  
Alexandr Faritovich Sabrekov ◽  
Shamil Maksyutov
Keyword(s):  
High Resolution ◽  
Landsat Imagery ◽  
Regional Scale ◽  
Water Bodies ◽  
Training Data ◽  
Taiga Zone ◽  
Wetland Ecosystem ◽  
Wetland Area ◽  
Wetland Ecosystems ◽  
High Resolution Images

Abstract. High-latitude wetlands are important for understanding climate change risks because these environments sink carbon dioxide and emit methane. However, fine-scale heterogeneity of wetland landscapes poses a serious challenge when generating regional-scale estimates of greenhouse gas fluxes from point observations. In order to reduce uncertainties at the regional scale, we mapped wetlands and water bodies in the taiga zone of The West Siberia Lowland (WSL) on a scene-by-scene basis using a supervised classification of Landsat imagery. Training data consist of high-resolution images and extensive field data collected at 28 test areas. The classification scheme aims at supporting methane inventory applications and includes seven wetland ecosystem types comprising nine wetland complexes distinguishable at the Landsat resolution. To merge typologies, mean relative areas of wetland ecosystems within each wetland complex type were estimated using high-resolution images. Accuracy assessment based on 1082 validation polygons of 10  ×  10 pixel size indicated an overall map accuracy of 79 %. The total area of the WSL wetlands and water bodies was estimated to be 52.4 Mha or 4–12 % of the global wetland area. Ridge-hollow complexes prevail in WSL's taiga zone accounting for 33 % of the total wetland area, followed by pine bogs or “ryams” (23 %), ridge-hollow-lake complexes (16 %), open fens (8 %), palsa complexes (7 %), open bogs (5 %), patterned fens (4 %), and swamps (4 %). Various oligotrophic environments are dominant among wetland ecosystems, while poor fens cover only 14 % of the area. Because of the significant change in the wetland ecosystem coverage in comparison to previous studies, a considerable reevaluation of the total CH4 emissions from the entire region is expected. A new Landsat-based map of WSL's taiga wetlands provides a benchmark for validation of coarse-resolution global land cover products and wetland data sets in high latitudes.

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