scholarly journals Plecoptera community of two small streams of Shillong, Meghalaya, North-East India

2021 ◽  
pp. 28-39
Author(s):  
Identicia Marwein ◽  
◽  
Susmita Gupta ◽  
Keyword(s):  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Positive Impact ◽  
Principal Component ◽  
Total Alkalinity ◽  
First Year ◽  
North East India ◽  
North East ◽  
Small Streams

A study on diversity and ecology of Plecoptera larvae was carried out at two small streams, Wahdienglieng and Umrisa of Shillong, Meghalaya, North-east India for the year 2014 and 2015. The total number of families and genera recorded during the study were 3 families and 8 genera. During the first year at Wahdienglieng, the Principal Component Analysis (PCA) revealed that the high weighted variables are total alkalinity, pH, electrical conductivity, water temperature and sand while at Umrisa, free carbon dioxide and electrical conductivity were strong variables. The next year at Wahdienglieng, PCA showed pH as the highly weighted variable while at Umrisa, the PCA indicated dissolved oxygen, water temperature and rainfall as influential variables. The CCA (Canonical Correspondence Analysis) dendrogram revealed that Indonemoura spp and Kamimuria spp have positive impact with sandy substratum in Wahdienglieng; while Amphinemura spp showed positive correlation with dissolved oxygen in Umrisa during the first year. In the next year, water temperature showed positive relation with Indonemoura spp and Tetropina spp at Wahdienglieng and Umrisa, respectively. The presence of Plecoptera larvae in these streams indicated that the water is unpolluted and the substratum type enabled the larvae to reside at various microhabitats with diverse species.

Impact of net pen aquaculture on lake water quality

2003 ◽  
Vol 47 (12) ◽  
pp. 293-300 ◽  
Author(s):  
J. Veenstra ◽  
S. Nolen ◽  
J. Carroll ◽  
C. Ruiz
Keyword(s):  
Water Quality ◽  
Organic Carbon ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Ictalurus Punctatus ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Army Corps ◽  
Lake Water Quality

A 3-year study was conducted by the U.S. Army Corps of Engineers assessing water quality related impacts of aquaculture of 250,000 channel catfish (Ictalurus punctatus) in floating net pens in the Rock Creek Arm of Lake Texoma, Oklahoma/Texas. Five large nylon nets suspended from a floating framework of galvanized metal anchored in open water 100 m offshore made up the net pens with fish stocking densities varying from 88 to 219 fish/m3. Water quality sampling was conducted biweekly from April to September and monthly from October to March at three locations. On all sampling dates field measurements of water temperature, pH, dissolved oxygen, and conductivity were recorded at 1 m depth intervals and water samples were collected at a depth of 0.5 m and near the bottom of the water column at each site. Sample analyses included: total alkalinity, total hardness, turbidity, chloride, sulfate, orthophosphate, total phosphorus, nitrate-N, nitrite-N, total Kjeldahl nitrogen, total organic carbon, dissolved organic carbon, biochemical oxygen demand, and chlorophyll a. The results showed statistically significant decreases in water temperature and dissolved oxygen and significant increases in field conductivity in surface waters near the net pens relative to other sampling sites. The most dramatic water quality effect observed during the study was decrease in dissolved oxygen levels near the net pens following lake turnover in the second year.

scholarly journals Behaviour of fourteen exotic ornamental fishes of Bangladesh under starved condition in aquaria

2013 ◽  
Vol 1 (1) ◽  
pp. 48
Author(s):  
ABM Mohsin ◽  
Roni Chandra Mondal
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Research Work ◽  
Ammonia Nitrogen ◽  
Total Alkalinity ◽  
Basic Knowledge ◽  
Survival Period ◽  
Research Findings ◽  
Constant Observation ◽  
Almost All

The behaviour of fourteen exotic ornamental fishes of Bangladesh under starved condition in aquaria was experimented from January to December, 2011. Fishes were belonging to 13 genera, 09 families and 4 orders. Two treatments each with three replications were used. Four different behavioural phases of fish were monitored through constant observation. Almost all the behavioural phases were seen earlier in the fishes of treatment T1. Marble angel survived more (1022±4.02 hrs; T2) than others. The lowest survival period (116±2.44 hrs; T1) was seen for albino suckermouth. Fishes were died earlier in T1 than T2, due to presence or absence of aeration facilities. Water temperature, dissolved oxygen, free CO2, pH, total alkalinity, ammonia-nitrogen and chlorine level were found to be varied from 25.66±0.17 to 28.66±0.35°C, 3.80±0.06 to 4.73±0.07 mg/l, 9.21±0.05 to 11.75±0.03 mg/l, 7.13±0.05 to 7.47±0.07, 76.66±1.64 to 108.92±3.20 mg/l, 0.0010±0.0006 to 0.0133±0.002 mg/l and 0.0045±0.001 to 0.012±0.0014 mg/l, respectively. The research findings would be helpful in gathering basic knowledge on different behavioural phases through which aquarists can maintain primitive behavioural phase in their aquaria.  Further research work is suggested in the aforesaid theme massively.

scholarly journals Changing trends of physicochemical parameters in Kaptai lake of Bangladesh

2015 ◽  
Vol 2 (2) ◽  
pp. 319-327 ◽  
Author(s):  
Md Abul Bashar ◽  
S Sanjib Basak ◽  
Kazi Belal Uddin ◽  
AKM Saiful Islam ◽  
Yahia Mahmud
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Physicochemical Parameters ◽  
Mean Value ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Secchi Disc ◽  
Changing Trends ◽  
Test Kit ◽  
Baseline Information

Physicochemical parameters were studied for a period of two years from July 2012 to June 2014. The parameters namely air and water temperature were estimated using centigrade thermometer, transparency using secchi disc while pH, CO2, total hardness, total alkalinity, dissolved oxygen (DO) were estimated using HACH water test kit. The highest air and water temperature (31.52°C and 30.38°C) were recorded in September, 2013 whereas the lowest air and water temperature 21.04°C and 20.42°C were recorded in January, 2014. The pH of water was found to alkaline in nature (6.9 to 8.20). The maximum free CO2 value (7.81 mg/l) was recorded in February, 2014 and minimum (2.36 mg/l) in November, 2012.The value of total alkalinity was found to fluctuate from 51.9 mg/l in December 2012 to 90.68 mg/l in December 2013. Total hardness of lake water varied from 37.8 (August) to 47.3 (November) in 2012 and 55.17 (July) to 87.49 (February) in 2013-14 with regular trends in fluctuation. Mean secchi disc reading varied from 1.94±.57 m in 2012-13 and 2.02±0.40 m in 2013-14. Dissolved oxygen was found to vary from 6.10 (February) to 6.80 (November) during 2012, 3.90 (February) to 6.38 mg/l (July) during 2013 with a mean value of 6.4±1.51 and 5.74±0.68 mg/l. Water depth was found to fluctuate from 4.39 to 11.76 m with a mean value of 7.96± 2.56 m for one year study. The present research provides baseline information on changing trends of physicochemical parameters of Kaptai Lake which will facilitate sustainable management and conservation of this lake ecosystem.Res. Agric., Livest. Fish.2(2): 319-327, August 2015

scholarly journals Physico-chemical Parameters of Koshi River at Kushaha Area of Koshi Tappu Wildlife Reserve

Our Nature ◽  
1970 ◽  
Vol 9 (1) ◽  
pp. 156-167 ◽  
Author(s):  
D. Thapa Chhetry ◽  
J. Pal
Keyword(s):  
Dissolved Oxygen ◽  
Water Temperature ◽  
Air Temperature ◽  
Oxygen Demand ◽  
Summer Season ◽  
Biological Oxygen Demand ◽  
Total Alkalinity ◽  
Total Hardness ◽  
Chemical Parameters ◽  
Wildlife Reserve

The Koshi river is the major tributaries of the Ganges which originates from the snowy peaks of Tibetan plateau in the central Himalayas. Its total catchment area is 60,400 km2, of which 28,140 km2 lies in Nepal, while the remainder is situated in Tibet. It passes from Nepal to India via the Koshi Tappu Wildlife Reserve area of Nepal. It destroys large area through floods, especially in India. This paper deals with the air temperature and phyco-chemical parameters like temperature, transparency, pH, oxygen, carbondioxide, alkalinity, hardness, chloride and biological oxygen demand of water of Koshi river at Kushaha area of Koshi Tappu Wildlife Reserve. The water temperature was recorded maximum in summer season but the transparency, pH, dissolved oxygen, total alkalinity and total hardness were recorded maximum in winter season. Similarly, free carbondioxide was maximum in rainy season and chloride and biological oxygen demand were recorded maximum in summer season. The air temperature and water temperature had positive and significant correlation with free carbondioxide and biological oxygen demand. Dissolved oxygen had positive and significant correlation with pH, total alkalinity and total hardness. Similarly, total alkalinity had positive and significant correlation with transparency, total hardness, chloride etc.DOI: http://dx.doi.org/10.3126/on.v9i1.5746

scholarly journals Physico-chemical properties of Seepage stream at Shripur area, eastern Nepal

2013 ◽  
Vol 2 ◽  
pp. 46-54
Author(s):  
Damodar Thapa Chhetry ◽  
Joydeb Pal
Keyword(s):  
Water Temperature ◽  
Air Temperature ◽  
Rainy Season ◽  
Winter Season ◽  
Chemical Properties ◽  
Summer Season ◽  
Total Alkalinity ◽  
Total Hardness ◽  
First Year ◽  
Physico Chemical

Physico-chemical parameters of the Seepage stream of Shripur area were studied for two years from July, 2002 to June, 2004, once in every month at regular intervals. The maximum air temperature was recorded in rainy season during first year (July, 2002 to June, 2003) and second year study period (July, 2003 to June, 2004). Water temperature was maximum in summer and lowest in winter season. Transparency, total alkalinity, total hardness, chloride were maximum in winter season. Free CO2 and BOD was maximum in summer season. The minimum transparency, total alkalinity, total hardness and chloride were recorded in rainy season. DO and pH were maximum in winter and minimum in summer season during the whole study period. Air temperature, water temperature, free CO2, BOD showed positive and significant correlation with each other. Transparency showed positive and significant correlation with pH, DO, total alkalinity, total hardness and chloride. pH showed positive and significant correlation with DO and chloride. Similarly, DO, total alkalinity, total hardness and chloride showed positive and significant correlation with each other. DOI: http://dx.doi.org/10.3126/njbs.v2i0.7489 Nepalese Journal of Biosciences 2 : 46-54 (2012)

scholarly journals Nictemeral variations for pacu Caranha, Piaractus mesopotamicus (Holmberg, 1887) culture in single - phase

2010 ◽  
Vol 53 (4) ◽  
pp. 873-881 ◽  
Author(s):  
Luiz Eduardo Guimarães de Sá Barreto ◽  
Marco Antonio Igarashi ◽  
Carmino Hayashi
Keyword(s):  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Single Phase ◽  
External Environment ◽  
Fish Pond ◽  
Piaractus Mesopotamicus ◽  
Autumn Season ◽  
Very High

Studies related to nictemeral variation were executed in a fish growing pond, during all the seasons of the year, collecting data for dissolved oxygen; temperature; pH and electrical conductivity at the feeding channel on pond's surface, bottom and at streamlet bed. The results showed that Autumn was the season which had the lowest values of water temperature, the interval points, during Spring time, had superior average values of temperature when compared to the ones that were observed at external points. The lowest and highest index of pH were during Autumn season. The electrical conductivity didn't show significant differences during Autumn season. The samples obtained from the streamlet had very high significant differences with the samples of fish pond inner part, showing that there was an influence on external environment from the effluent which came from the inner part of the fish pond on limnology variables.

scholarly journals Foliar epidermal, stem and petiole anatomy of Meghalayan Dioscorea L. (Dioscoreaceae) and its systematic implication

2017 ◽  
Vol 24 (1) ◽  
pp. 53-63
Author(s):  
Nilofer Sheikh ◽  
Yogendra Kumar
Keyword(s):  
Cluster Analysis ◽  
Principal Component ◽  
Anatomical Study ◽  
North East India ◽  
North East ◽  
Dichotomous Key ◽  
Starch Grain ◽  
Plant Taxon ◽  
Anatomical Characters ◽  
And Cluster Analysis

A comparative anatomical study of eight species of Dioscorea L. from Meghalaya, North East India was carried out in order to evaluate the taxonomic significance of anatomical characters to differentiate the species. Characters were coded and analyzed by PCA and cluster analysis. The combination of selected qualitative and quantitative anatomical characters of foliar epidermis, stem and petiole were significant for identification of species. The characters that contributed most to the separation of the species were type of stomata, length of stomata, stomatal index, leaf epidermal hairs, stem epidermal hairs, layer of stem sclerenchyma, number of vascular bundle in outer ring and inner ring of stem, paired or unpaired metaxylem, presence of phloem at both ends or at one end, presence or absence of starch grain in stem, petiole epidermal hair and presence or absence starch grain and crystal in petiole. An indented dichotomous key based on anatomical characters was constructed to distinguish and identify the species.Keywords: Anatomy; Dioscorea; Cluster Analysis; Principal Component Analysis; Systematics.Bangladesh J. Plant Taxon. 24(1): 53–63, 2017 (June)

scholarly journals Distribution and abundance of Chironomidae (Diptera, Insecta) in an impacted watershed in South-east Brazil

1999 ◽  
Vol 59 (4) ◽  
pp. 553-561 ◽  
Author(s):  
M. M. G. S. M. MARQUES ◽  
F. A. R. BARBOSA ◽  
M. CALLISTO
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Principal Component ◽  
Total Alkalinity ◽  
Pollution Levels ◽  
Sampling Points ◽  
Genus Richness ◽  
Nitrogen Concentrations ◽  
Chironomid Midges ◽  
Abundant Genus

Patterns of abundance and distribution of chironomid midges (Diptera, Chironomidae) in the middle Rio Doce basin were analysed. Human activities (mining, steel processing, and Eucalyptus spp. forestry) contribute to environmental degradation and low water quality in this watershed. Physical and chemical water traits (dissolved oxygen, pH, total alkalinity, electric conductivity, phosphorus and nitrogen concentrations) of 20 sampling points were used in a Principal Component Analysis (PCA) to establish the best and worst water quality. Sampling points recorded as the most polluted showed low genus richness of Chironomidae, less than five genera from the total 23, and dominance of the genus Chironomus, a bioindicator of environmental stress. Following Chironomus, the second most frequent and abundant genus was Cricotopus, whose distribution could not be related to pollution levels. The Tanypodinae sub-family showed certain sensitivity to low dissolved oxygen concentrations and high nutrients levels, and was not found at points of high pollution levels.

scholarly journals Ecological classification of the freshwater Ostracoda (Crustacea) based on physicochemical properties of waters and habitat preferences

2018 ◽  
Vol 54 ◽  
pp. 26 ◽  
Author(s):  
Okan Külköylüoğlu ◽  
Mehmet Yavuzatmaca ◽  
Derya Akdemir ◽  
Ebru Çelen ◽  
Nurhayat Dalkıran
Keyword(s):  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Environmental Variables ◽  
Habitat Preferences ◽  
Habitat Type ◽  
Alpha Diversity ◽  
Abundant Species ◽  
Critical Issue ◽  
Cosmopolitan Species

The relationship between ecological characteristic of freshwater ostracods and their habitat preferences has been a critical issue for understanding of both current and past aquatic conditions. To evaluate this idea, 121 water bodies with 11 different habitat types were randomly sampled in the province of Kütahya. Water quality measurements indicated high to low (Ca2+ > Mg2+ > Na+) cations and relatively low (SO42− > Cl− > F−) anion concentrations with Ca2+ being the dominant ion. Sixteen of 23 species were new reports for the area. Alpha diversity (H′ = 3.64) was found relatively high. Four most abundant species with ca. 93% of similarities contributed highest alpha values in warm to cooler (lower than 25 °C), alkaline (pH 8.22), and fresh to slightly brackish waters. Heterocypris salina and Ilyocypris bradyi also revealed the highest tolerances for electrical conductivity. Based on habitat type, species were clustered into three main groups (I–III). Canonical Correspondence Analyses explained about 57.4% of correlation between species and environmental variables. Redox potential, pH, water temperature and electrical conductivity were found to be the most effective factors on species occurrences while habitat type and dissolved oxygen were not effective. Total number of species showed strong negative and positive relationships with water temperature and dissolved oxygen, respectively. Results clearly showed that cosmopolitan species exhibited relatively wide tolerance ranges to different environmental variables. Accordingly, having wide tolerance ranges seems to provide advantages to cosmopolitan species, increasing their survival chances in a variety of habitats.

scholarly journals New record of three species of Leeches (Annelida:Hirudinea) in Al-Hindyia River / Babil Province / Iraq

2019 ◽  
Vol 16 (3(Suppl.)) ◽  
pp. 0677
Author(s):  
AL-Ameen Et al.
Keyword(s):  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
New Record ◽  
Oxygen Demand ◽  
Biological Oxygen Demand ◽  
Temperature Potential ◽  
Total Dissolved Solid ◽  
Physical And Chemical ◽  
Chemical Water

In this study, a total of 209 individuals of leeches were collected from Al-Hindyia River / Babil Province. 116 individuals were identified as Erpobdella octaculata (Linnaeus, 1758), 50 individuals as Erpobdella punctata (Leidy,1870) and  43 individuals as Hemiclepsis marginata (Müller, 1774).  Four samples were collected monthly during a period from February to June 2018. Some physical and chemical water properties were also examined, including air and water temperature, potential of hydrogen pH, Electrical Conductivity EC, Total Dissolved Solid TDS, Dissolved Oxygen DO, and the Biological Oxygen Demand BOD₅.  Air and water temperature were ranged 19.5-29, & 14.6-23.2 °C respectively. The values of pH ranged 6.2-7.6. EC ranged 1104-1581 μs/cm². The TDS recorded 669- 767 mg/l, while the DO reached 1.3- 8.5 mg / l, the BOD₅ ranged 3.5- 5.7 mg/l.

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