scholarly journals Abundance and annual distribution of freshwater snails and some trematode cercariae at Damietta Governorate, Egypt

2021 ◽  
Vol 58 (3) ◽  
pp. 233-247
Author(s):  
M. E. El-Zeiny ◽  
A. M. Ghoneim ◽  
O. A. Abu Samak ◽  
A. A. Khidr
Keyword(s):  
Abiotic Factors ◽  
Species Abundance ◽  
Abundant Species ◽  
Freshwater Snails ◽  
Snail Species ◽  
Chemical Parameters ◽  
Oxygen Conductivity ◽  
The North ◽  
Physico Chemical ◽  
Annual Distribution

Summary In addition to being a good food source, freshwater snails are considered one of the positively and negatively influencing invertebrates on the environment. Several biotic and abiotic factors are thought to affect the distribution and the dynamics of these snails. Freshwater snails are the most dominant and conspicuous individuals of the freshwater biota in Damietta Governorate. In this study, freshwater snails were collected monthly from 5 geographically and environmentally different sites at Damietta Governorate at the north of Egypt during June 2017-May 2018. Seven snail species; Lanistes carinatus, Lanistes varicus, Pila wernei, Segmentorbis angustus, Melanoides tuberculata, Biomphalaria alexandrina, and Gabbiella senoriansis, were identified. Lanistes carinatus was the most abundant species (56.4%) in the collection sites. Besides, Al-Inaniyyah village had the highest snail species abundance and variety. The abundance of the most recorded species varied seasonally; the highest abundance was recorded during summer while the lowest was during winter. The abundance of some snail species correlated positively or negatively with some physico-chemical parameters; water temperature, dissolved oxygen, conductivity, total dissolved salts, and electrical conductivity. Two types of trematode cercariae; gymnocephalus cercariae and xiphidiocercariae, were harvested from Lanistes carinatus. The highest prevalence of both cercarial types was detected during summer. The correlation between the prevalence of both cercarial types and the physico-chemical parameters were determined. Xiphidiocercariae were the most predominant cercarial type in Damietta Governorate. Our findings suggest that the invasion of some freshwater snails is likely to be the cause of the low prevalence or complete absence of some medically important intermediate snail hosts. We recommend further characterization of the distribution of freshwater snails and the interrelationships among them in Egypt, and suggest a controlled use of selected snail species to combat their medically important analogues.

scholarly journals Land use/land cover change, physico-chemical parameters and freshwater snails in Yewa North, Southwestern Nigeria

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246566
Author(s):  
Opeyemi G. Oso ◽  
Alex B. Odaibo
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Cover Change ◽  
Water Bodies ◽  
Freshwater Snails ◽  
Snail Species ◽  
Land Use Land Cover ◽  
Intermediate Hosts ◽  
Chemical Parameters ◽  
Physico Chemical

The management of ecosystem has been a major contributor to the control of diseases that are transmitted by snail intermediate hosts. The ability of freshwater snails to self-fertilize, giving rise to thousands of hatchlings, enables them to contribute immensely to the difficulty in reducing the endemicity of some infections in the world. One of the effects of land use/land cover change (LU/LCC) is deforestation, which, in turn, leads to the creation of suitable habitats for the survival of freshwater snails. This study was aimed at studying the land use/land cover change, physico-chemical parameters of water bodies and to understand the interplay between them and freshwater snails in an environment where a new industrial plant was established. Landsat TM, 1984, Landsat ETM+ 2000 and Operational land Imager (OLI) 2014 imageries of the study area were digitally processed using ERDAS Imagine. The land use classification includes settlement, water bodies, wetlands, vegetation and exposed surface. Dissolved oxygen, water temperature, pH, total dissolved solids and conductivity were measured with multipurpose digital meters. Snail sampling was done at each site for 30 minutes along the littoral zones, using a long-handled scoop (0.2mm mesh size) net once every month for 24 months. Independent t-test was used to determine the variation between seasons, Spearman’s rank correlation coefficient was used to test the relationship between physico-chemical parameters and snail species while regression was used to analyze the relationship between LU/LCC and freshwater snails. Species’ richness, diversity and evenness were examined using Margalef, Shannon Weiner and Equitability indexes. Snail species recovered include: Bulinus globosus, Bulinus jousseaumei, Bulinus camerunensis, Bulinus senegalensis, Bulinus forskalii, Amerianna carinatus, Ferrissia spp., Segmentorbis augustus, Lymnaea natalensis, Melanoides tuberculata, Physa acuta, Gyraulus costulatus, Indoplanorbis exuxtus and Gibbiella species. Out of the total snails recovered, M. tuberculata (2907) was the most abundant, followed by Lymnaea natalensis (1542). The highest number of snail species was recovered from Iho River while the least number of snails was recovered from Euro River. The mean and standard deviation of physico-chemical parameters of the water bodies were DO (2.13±0.9 mg/L), pH (6.80±0.4), TDS (50.58±18.8 mg/L), Temperature (26.2±0.9°C) and Conductivity (74.00±27.5 μS/cm). There was significant positive correlation between pH and B. globosus (r = 0.439; P<0.05). Dissolved oxygen showed significant positive correlation with B. globosus (r = 0.454; P<0.05) and M. tuberculata (r = 0.687; P<0.01). There was a positive significant relationship between LULCC and B. camerunensis (p<0.05). The positive relationship between LULCC and the abundance of B. globosus, B. jousseaumei was not significant. The area covered by water bodies increased from 3.72 to 4.51 kilometers; this indicates that, more suitable habitats were being created for the multiplication of freshwater snails. We therefore conclude that, increase in areas suitable for the survival of freshwater snails could lead to an increase in water-borne diseases caused by the availability of snail intermediate hosts.

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 Effect of Diverse Abiotic Conditions on the Structure and Biodiversity of Ichthyofauna in Small, Natural Water Bodies Located on Agricultural Lands

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2674
Author(s):  
Adam Brysiewicz ◽  
Przemysław Czerniejewski ◽  
Małgorzata Bonisławska
Keyword(s):  
Crucian Carp ◽  
Abiotic Factors ◽  
Common Knowledge ◽  
Species Abundance ◽  
Buffer Zone ◽  
Water Bodies ◽  
Agricultural Lands ◽  
Small Water ◽  
The North ◽  
K Concentration

Mid-field natural ponds promote regional biodiversity, providing alternative habitats for many valuable animal species. The study’s objective was to determine the most important abiotic factors, including hydrochemical and morphometric parameters, affecting fish occurrence in natural, small water bodies on agricultural lands. The studies were conducted in nine randomly selected water bodies located in Poland (the North European Plain). Eleven species of fish were recorded in the waterbodies, with the most abundant being cyprinids (mainly crucian carp). Canonical correspondence analysis (CCA) showed that an increase in oxygenation, temperature, amount of macrophytes, and K concentration and a decrease in the concentration of phosphates, electrical conductivity (EC), Mg, and Cl is associated with the most beneficial living conditions for the most frequently occurring species in the studied water bodies—crucian carp and tench. Aside from the hydrochemical parameters of water in the natural ponds, the number of fish correlates with the basin area and the pond area, maximum depth, area of the buffer zone surrounding the water bodies, and the number of macrophytes. This last factor also has a significant influence on the species’ abundance in the water bodies. Fish occurrences in mid-field ponds and common knowledge on their important role in the environment require taking steps to provide fish protection.

scholarly journals The bionomics and diversity of freshwater snails species in Yewa North, Ogun State, Southwestern Nigeria

2014 ◽  
Vol 51 (4) ◽  
pp. 337-344 ◽  
Author(s):  
O. Salawu ◽  
A. Odaibo
Keyword(s):  
Integrated Control ◽  
Water Bodies ◽  
Freshwater Snails ◽  
Snail Species ◽  
Southwestern Nigeria ◽  
Snail Control ◽  
Ogun State ◽  
Physico Chemical ◽  
Control Intervention ◽  
Endemic Areas

AbstractSnail control as a form of integrated control for schistosomiasis has been strongly advocated but data on biocontrol using competitor snails are relatively lacking in most endemic areas. Monthly sampling of freshwater snails was conducted in four water bodies in Yewa North Local Government Area, Ogun State, Nigeria. Monthly in situ measurements of the physico-chemical characteristics of surface waters were carried out using field meters. A total number of 13 snail species were recovered from the water bodies. Of these, Bulinus camerunensis was reported for the first time in Nigeria. A significant positive relationship occurred between snail density and dissolved oxygen. Other important relationships were those between Lanistes lybicus and Bulinus senegalensis, Bulinus globosus and Bulinus jousseaumei, and B. senegalensis and Segmentorbis augustus. Snail control using competitor snails should be integrated into schistosomiasis management programmes in endemic areas in order to prevent residual schistosomiasis transmission after control intervention through mass drug treatment.

scholarly journals On the use of statistical techniques to assess the interrelationships of key water characteristics and plankton in the RIver Ganga at Veer-Bhadra Barrage

2021 ◽  
Vol 16 (3) ◽  
Author(s):  
Vandana Vandana ◽  
Vasantika Kashyap
Keyword(s):  
Abiotic Factors ◽  
Total Alkalinity ◽  
Statistical Techniques ◽  
Chemical Parameters ◽  
Correlation And Regression Analysis ◽  
Water Characteristics ◽  
Physico Chemical ◽  
River Ganga ◽  
Statistical Relationships

Past studies have demonstrated that some physico-chemical parameters play an important role in determining the quantity and quality of plankton in mountain (Himalayan) rivers. Due to their interplay they have well-defined statistical relationships. The present study assesses relationships among water temperature, DO, pH, CO2 and total alkalinity (TA) and plankton in the foothill section of the river Ganga at Veer-Bhadra barrage, Rishikesh. The correlation and regression analysis between showed linear +ve weak (non-significant) relationship for all abiotic factors except WT-DO. DO and TA show –ve linear insignificant relationship with plankton. Weak relationships suggests a perturbed ecosystem

Evenness of species abundance in the littoral communities of the Murman

2021 ◽  
pp. 38-45
Author(s):  
Svetlana V. Malavenda
Keyword(s):  
Species Diversity ◽  
Abiotic Factors ◽  
Species Abundance ◽  
Species Structure ◽  
Substrate Type ◽  
Soil Features ◽  
The North ◽  
Structure Of Communities ◽  
North Eastern ◽  
Eastern Border

The spatial and species structure of fucus algae communities in littoral phytocenoses of Eastern Murmansk is studied. This is the North-Eastern border of Fucus communities. 87 species of macrophyte algae were identified in the communities. The variation of species diversity as an indicator of community structure is determined depending on the leading abiotic factors – salinity, surf content, and substrate type. The species diversity of macrophyte algae in the littoral of the Eastern Murmansk is determined primarily by surf activity. Under similar hydrological conditions, soil features determine the density of thickets and, consequently, the number of species found in a single sample. Salinity fluctuations at which it drops below 15‰ are critical for most species and fundamentally change the structure of communities. The highest values of the indices of species diversity were observed in the littoral areas of the coast that are poorly protected from the surf.

scholarly journals Descriptions of strigea cercariae from the Gauteng and North West Provinces, South Africa

2012 ◽  
Vol 79 (1) ◽  
Author(s):  
Esmey B.E. Moema ◽  
Pieter H. King ◽  
Chantelle Baker
Keyword(s):  
Freshwater Snail ◽  
Freshwater Snails ◽  
Parasitic Diseases ◽  
Snail Species ◽  
Intermediate Hosts ◽  
North West ◽  
The North ◽  
Different Types ◽  
Microscopy Techniques ◽  
Lymnaea Natalensis

Freshwater snails are known to serve as first intermediate hosts for various parasitic diseases such as schistosomosis, amphistomosis and fasciolosis. Two freshwater snail species, Lymnaea natalensis, Krauss 1848 and Bulinus tropicus, Krauss 1848 were sampled from five localities in Gauteng and one locality in the North West Province from 2007 to 2010. These snails were collected in order to study their cercarial sheddings. They were found to be infected with three different types of strigea cercariae, of which the morphology was studied using standard light and scanning electron microscopy techniques.

scholarly journals Physico-chemical and Biological Aspects of Monsoon Waters of AShulia for Economic and Aesthetic Applications: Preliminary Studies

1970 ◽  
Vol 42 (4) ◽  
pp. 377-396 ◽  
Author(s):  
Md. Ariful Islam Khan ◽  
AMM Maruf Hossain ◽  
ME Huda ◽  
M Shahidul Islam ◽  
Syed Fazle Elahi
Keyword(s):  
Water Resource Management ◽  
Physical Parameters ◽  
Biological Parameters ◽  
Chemical Parameters ◽  
The North ◽  
Physical Chemical ◽  
Physico Chemical ◽  
North Eastern ◽  
Biological Aspects ◽  
North Eastern Part

In the north-eastern part of Dhaka the 'Turag River' extends over Ashulia thana with a few branches. The north-eastern part of Ashulia thana mainly constitute low lands with a physiography of Madhupur Tract interlaced with Brahmaputra Floodplain. Monsoon extends over these lands from May to October and from July to October these lands remain flooded with a water depth of more than 180 cm to less than 275 cm due to surface runoff of rain water and overflow of the river canals. The area under water during this four month period can be used for economic applications such as various types of fishery as well as enhancing the present recreational applications. For these purposes the physical, chemical, and biological aspects of the water are studied to evaluate its suitability for the applications. The study was held over the period of July through December, 2006, samples being taken once every month. The physical parameters covered transparency, odor, temperature, salinity, EC, TSS, and TDS. The chemical parameters of water studied were pH, DO, BOD5, COD, hardness, NO2---N, NO3---N, PO43---P, SO42---S, Cl-, Na, K, Ca, Fe, Ni, Cu, Zn, Cd, Pb, and Hg. Among the biological parameters 'phytoplankton' and 'zooplankton' were qualitatively identified in microscopic observation up to genera. From July to October the water was transparent and of good odor, temperature ranged from 28.2°C to 24.6°C, salinity within 0.58 to 0.83 mg/L, EC within 250 to 608 ? mho/cm, TSS 0.42 to 0.82 mg/L, and TDS within 2.8 to 5.2 mg/L. Among the chemical parameters, pH ranged from 6.6 to 7.4, DO within 6.4 to 6.9 mg/L, BOD5 within 1.5 to 3.28 mg/L, COD within 3.04 to 12.89 mg/L, hardness 26.08 to 37.5 mg/L, NO2--N from undetectable to maximum 0.562 mg/L, NO3--N within 0.539 to 2.158 mg/L, PO43--P 2.35 to 2.75 mg/L, SO42--S 0.23 to 0.29 mg/L, Cl- 1.65 to 6.16 mg/L, Na 3.6 to 12.5 mg/L, K 9.7 to 11.5 mg/L, Ca 6.52 to 14.82 mg/L, Fe 0.1269 to 0.5062 mg/L, Ni 0.028 to 0.050 ?g/L, Cu 0.028 to 0.043 mg/L, Zn 0.023 to 0.048 ?g/L, Cd 0.0023 to 0.0043 ?g/L, Pb 0.043 to 0.093 ?g/L, and Hg was not detected at ppb level. Among the biological parameters a number of phytoplankton were identified covering the classes of Bacillariophyceae, Chlorophyceae, Euglenophyceae, and Cyanophyceae. The zooplanktons included the orders Cladocera and Copepoda within the class Crustacea of phylum Arthropoda. Key words: Freshwater ecology, Water resource management Bangladesh J. Sci. Ind. Res. 42(4), 377-396, 2007

Temporal Variation in Species Abundance and Richness of Culicoides (Diptera: Ceratopogonidae) in a Tropical Equatorial Area

2019 ◽  
Vol 56 (4) ◽  
pp. 1013-1018
Author(s):  
Gaudino Marco Cantanhede Gusmão ◽  
Gustavo Almeida Brito ◽  
Leandro Santos Moraes ◽  
Maria Da Conceição Abreu Bandeira ◽  
José Manuel Macário Rebêlo
Keyword(s):  
Rural Areas ◽  
Light Trap ◽  
Species Abundance ◽  
Abundant Species ◽  
Domestic Animals ◽  
Maximum Temperature ◽  
Culicoides Species ◽  
Biting Midges ◽  
Species Richness And Abundance ◽  
Annual Distribution

Abstract The aim of this study was to investigate whether temperature, rainfall, and humidity influence the annual distribution of Culicoides Latreille 1809, species abundance and richness in rural areas on São Luís Island in the state of Maranhão, Brazil. Biting midges were collected in housing for domestic animals in the peridomestic areas of 10 homes. A CDC light trap was installed in each peridomestic area from 6:00 p.m. to 6:00 a.m. once a month for 12 mo. In total, 23,633 individuals belonging to 26 Culicoides species were captured. The most abundant species were Culicoides diabolicus Hoffman, 1925 (27.43%), C. ignacioi Forattini, 1957 (25.9%), C. flavivenulus Costa Lima, 1937 (15.53%), C. insignis Lutz, 1913 (10.66%), C. filariferus Hoffman, 1939 (6.21%), C. boliviensis Spinelli & Wirth, 1984 (6.07%), C. foxi Ortíz, 1950 (2.83%), and C. leopoldoi Ortíz, 1951 (2.54%). Species richness and abundance were greater during the rainy season (24 species; 88% of the individuals) than during the dry season (18 species; 12% of individuals). However, persistent rain on the days the midges were collected or in the preceding 24 h adversely affected abundance. Mean monthly maximum temperature and rainfall on the day of the collection adversely affected Culicoides abundance and richness.

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