Study on Fish Ecology of the Seti Gandaki River Pokhara: II. Spatio-Temporal Variations in Fish Communities

Present paper deals with the spatio-temporal variations in distribution and abundance of fishes along the 30 km stretch of the Seti Gandaki river and its two major tributaries, Mardi Khola and Vijaypur Khola, in Pokhara Valley, Western Nepal. A total of 30 species of fishes belonging to 5 orders, 9 families and 22 genera were recorded from five sites on the river and its tributaries. Cyprinoids were predominant among fishes (17 spp.), siluroids (5 spp.), balitorids and cobitids (4 spp.), channioids (2 spp.), belonoids (one sp.) and mastacembeloids (one sp.). Among cyprinoids, mostly cyprinines were dominant groups (7 spp.) followed by rasborines (7 spp.), garrines (2 spp.) and schizothoracines (one sp.). There was increasing trend of species richness at upstream site (17 spp.). to downstream site (20 spp.) showing a longitudinal pattern. The total fish abundance and family-wise abundance at all the sites observed major peak during the spring and fall during the winter season in both the years of study. The average total density of fishes during the spring peak was highest (51.07/ha) at the upper tributary site and lowest (24.69/ha) at the urban site. According to the distribution pattern and abundance, the population status of the gamefish, mahseer [Tor tor (Ham)] has been endangered (E); that of game fishes [Tor putitora (Ham.) and Chagunius chagunio (Ham.)] and Zebra-fish [Brachydanio rerio (Ham.)] to are vulnerable (V); that of loach [Lepidocephalus guntea (Ham.)], cat-fishes [Myersglanis blythii (Day) and Amblyceps mangois (Ham.)] are rare (R).DOI: http://dx.doi.org/10.3126/njst.v12i0.6523 Nepal Journal of Science and Technology 12 (2011) 350-357

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Environmental Variables of the Seti Gandaki River Basin Pokhara, Nepal

Journal of Institute of Science and Technology ◽

10.3126/jist.v22i2.19604 ◽

2018 ◽

Vol 22 (2) ◽

pp. 129-139 ◽

Cited By ~ 2

Author(s):

Kishor Kumar Pokharel ◽

Khadga Bahadur Basnet ◽

Trilok Chandra Majupuria ◽

Chitra Bahadur Baniya

Keyword(s):

Water Temperature ◽

River Basin ◽

Environmental Variables ◽

Temporal Variations ◽

Total Alkalinity ◽

Urban Site ◽

Water Conductivity ◽

Free Carbon Dioxide ◽

Spatio Temporal ◽

Carbon Dioxide Co2

Present paper focuses on the spatio-temporal variations and correlations among the environmental variables of the Seti Gandaki River basin, Pokhara, Nepal. A total of five sites, three along the river and two in tributaries were selected for this study. Water sampling was done fortnightly for environmental variables following standard methods during July 2011 to June 2012. Mean and standard deviation of the environmental variables revealed that the depth (0.9 ± 0.3), pH (8 ± 0.4), total phosphates (PO4) (0.10 ± 0.03) and nitrates (NO3) (0.13 ± 0.04) were normally variable among the sites. But the discharge (40.00 ± 37.00), width (32.30 ± 13.00), turbidity (81.40 ± 51.00), transparency (29.10 ± 15.00), conductivity (166.00 ± 80.00), water temperature (18.00 ±4.00), dissolved oxygen (DO) (8.00 ± 2.00), free carbon dioxide (CO2) (7.00 ± 2.00) and total alkalinity (98.00 ± 22.00) varied among sites equally. Correlation coefficient between the sites and environmental variables revealed that sites were found significantly correlated with water conductivity (r2 = 0.6), DO (r2 = -0.52), and free CO2 (r2 = 0.6); depth of water with width (r2 = 0.94), discharge (r2 = 0.96), turbidity (r2 = 0.71), transparency (r2 = -0.62), water temperature (r2 = 0.60), pH (r2 = -0.52) and DO (r2 = -0.48); water temperature with pH (r2 = -0.54), DO (r2 = -0.79), free CO2 (r2 = 0.69), total alkalinity (r2 = -0.58), total PO4 (r2 = 0.54) and NO3 (r2 = 0.62), etc. The enhancement of turbidity, conductivity, free CO2, phosphates and nitrates, while, suppression of transparency, pH and DO at the urban site indicated the urban influence. Journal of Institute of Science and TechnologyVolume 22, Issue 2, January 2018, page: 129-139

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Spatio-temporal variation of zooplankton community structure in tropical urban waterbodies along trophic and urban gradients

Ecological Processes ◽

10.1186/s13717-019-0196-2 ◽

2019 ◽

Vol 8 (1) ◽

Cited By ~ 1

Author(s):

Siti Balqis Abd. Razak ◽

Zati Sharip

Keyword(s):

Community Structure ◽

Zooplankton Community ◽

Sampling Period ◽

Temporal Variations ◽

Ecological Impacts ◽

Tropical Lakes ◽

Total Density ◽

Shoreline Development ◽

Zooplankton Community Structure ◽

Spatio Temporal

AbstractThe ecological impacts of urbanization and eutrophication on zooplankton communities in urban waterbodies have recently gained wide interest. Study findings vary across species and urban waterbodies. How the development of such changes affects the variation of biotic assemblages has only been explored to a limited extent in tropical urban lakes.Spatial and temporal variations of zooplankton community structure in 11 urban waterbodies in the Klang Valley, Malaysia were investigated along trophic and urbanization gradients. Zooplankton and water quality samples were collected three times, between May and November 2017, from two different locations in each lake. All three main zooplankton groups (rotifera, copepoda, and cladocera) were recorded from the study areas throughout the sampling period. The zooplankton community structure, particularly with regard to rotifers and cladocerans, varied between lakes and seasons. Zooplankton diversity does not vary with lake size or distance from the city center but does vary with shoreline development index and urbanization impacts. The zooplankton populations were dominated by rotifers, mainly Brachionus angularis at all study sites during the study period followed by copepods and cladocerans. The total density of zooplankton was significantly highest (p < 0.05) in the hypereutrophic lakes and during the dry season. Zooplankton diversity and rotifer species richness were negatively correlated with total phosphorus (TP). Diversity increased with urbanization and shoreline development, with rotifers as a potential bioindicator of trophic state in urban tropical lakes, due to their close relationship with TP.

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SPATIO-TEMPORAL VARIATIONS OF MACRO-INVERTEBRATES IN RIFFLES AND POOLS OF MARDI AND VIJAYPUR STREAMS POKHARA, NEPAL

Ecoprint An International Journal of Ecology ◽

10.3126/eco.v20i0.11442 ◽

2014 ◽

Vol 20 ◽

pp. 61-70

Author(s):

K. K. Pokharel

Keyword(s):

Ecological Monitoring ◽

Temporal Variations ◽

Total Density ◽

Major Peak ◽

Agricultural Lands ◽

Taxa Richness ◽

Spring Peak ◽

Spatio Temporal

Present paper deals with the spatio-temporal variations in diversity and density of macro invertebratesin riffles and pools of the Mardi and the Vijayapur streams, Pokhara, Nepal. It was the pioneeringwork to study the biotic assemblage. Altogether 47 genera (32 from the riffles and 34 from the pools)belonging to 38 families and 12 orders were recorded during the study period. The taxa richness washigher (38 genera) in the Mardi stream than in the Vijayapur stream (30 genera). Total density at bothsites observed major peak and down fall in the spring and summer seasons, respectively. The averagetotal density during the spring peak was higher (967.42 m-2 in riffle and 652.10 m-2 in pool) at Site 1(Mardi stream) than at Site 2 (Vijaypur stream) (541.02 m-2 in riffle and 537.43 in pool). This peakwas mainly contributed by the order ephemeroptera. Ephemeroptera, diptera and trichoptera werefound predominant orders comprising 11, 8 and 8 genera, respectively. Heptagenidae, baetidae andleptophlebidae; chironomidae, ceratopogonidae and tipulidae, and hydropsychidae, psychomyidaeand polycentropodidae were dominant families among ephemeroptera, diptera and trichopterarespectively. The dominant genera were, Heptagenia Walsh, Rhithrogena Eaton and Baetis Leach;Tendipes Meigen, Culicoides Latreille and Simulium Hagen; Hydropsyche Pictet and PsychomyiaPictet; Psephenus Haldeman and Heterlimnius Hinton; Octogomphus Selys and Argia Rambur andPlanaria Girard among ephemeroptera, diptera, trichoptera, plecoptera, coleoptera, odonata andtricladida, respectively. The lower taxa richness at Site 2 having urban influence reflects theperturbation of stream environment due to urbanization, industrialization and application of inorganicfertilizers and pesticides in the agricultural lands, which needs regular ecological monitoring andmeasures to control further deterioration.DOI: http://dx.doi.org/10.3126/eco.v20i0.11442ECOPRINTAn International Journal of EcologyVol. 20, 2013Page: 61-70

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Spatio-Temporal Persistence of the Abra Alba-Pectinaria Koreni Muddy-Fine Sand Community of the Eastern Bay of Seine

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400038698 ◽

1997 ◽

Vol 77 (4) ◽

pp. 1165-1185 ◽

Cited By ~ 43

Author(s):

E. Thiébaut ◽

L. Cabioch ◽

J.-C. Dauvin ◽

C. Retiere ◽

F. Gentil

Keyword(s):

Dominant Species ◽

Salinity Gradient ◽

Food Limitation ◽

Temporal Stability ◽

Fine Sand ◽

Temporal Variations ◽

Total Density ◽

Factorial Correspondence Analysis ◽

Spatio Temporal ◽

Density And Biomass

The spatial distribution and temporal variations of the Abra alba-Pectinaria koreni community from the eastern part of the Bay of Seine were investigated through four winter surveys (1986, 1987, 1988 and 1991). A grid of 40–67 stations was sampled each year using a Hamon grab (0·25 m-2) for macrofauna collection and sediment analysis. The fauna was dominated by polychaetes and in a lower part by molluscs and echinoderms. Although species richness with ~100 species collected during each survey was high, total density and biomass (±SE) resulted principally from about ten dominant species, and varied between 846·9 ±163·5 and 1135·3 ±186·7 ind m-2 and 23·52 ±4·41 and 27·48 ±4·45 g m-2respectively. The dominant species were patchily distributed and exhibited weak spatio-temporal fluctuations except the two bivalves A. alba and Cultellus pellucidus. Factorial correspondence analysis (FCA) of the distribution of main species among stations and automatic hierarchical classification identified five faunal assemblages which were relatively stable in space and time. The temporal stability of the community could be generated by processes of larval retention near parental population, and sediment stabilization induced by the low abundance of deposit feeders and the high densities of the tube-dwelling polychaete Owenia fusiformis. While the sediment variables were a poor indicator of the spatial structure of the community, the salinity gradient off the Seine Estuary and post-settlement processes (e.g. food limitation and postlarval drifting) have been proposed to explain it. Comparison with an earlier survey (i.e. 1971) suggested a degree of long-term persistence of the community structure in qualitative and quantitative terms.

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Assessment of Spatio-Temporal Variations of Particulate Matter and Gaseous Pollutants in The Port City, Paradip, East Coast of India

Proceedings of International Web Conference in Civil Engineering for a Sustainable Planet ◽

10.21467/proceedings.112.22 ◽

2021 ◽

Author(s):

Rashmi Ranjan Behera ◽

Arakshita Majhi ◽

Deepty Ranjan Satapathy

Keyword(s):

Particulate Matter ◽

Winter Season ◽

Ambient Air ◽

Temporal Variations ◽

Gaseous Pollutants ◽

Industrial Sites ◽

Pm10 And Pm2.5 ◽

Ambient Air Monitoring ◽

Spatio Temporal ◽

Monitoring Stations

This study aims to assess the spatial and temporal variations of aerosol pollutants within the nine selected ambient air monitoring stations, including residential, commercial, and industrial sites in Paradip city based on two seasons, i.e., winter and summer, from January 2019 to June 2019. The particulate matter (PM) like PM10 and PM2.5 and gaseous pollutants like sulphur dioxide (SO2), nitrogen dioxide (NO2), and ammonia (NH3) samples were collected at each monitoring stations. The 24-hour average concentrations of PM10 and PM2.5 showed the highest levels in the winter season and lowest in the summer season. The value exceeded the permissible limit of India-national ambient air quality standards (IND-NAAQS) at all the monitoring stations.

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Spatio-temporal variations in bacterial and fungal community associated with dust aerosol in Kuwait

PLoS ONE ◽

10.1371/journal.pone.0241283 ◽

2020 ◽

Vol 15 (11) ◽

pp. e0241283

Author(s):

Fadila Al Salameen ◽

Nazima Habibi ◽

Saif Uddin ◽

Khalil Al Mataqi ◽

Vinod Kumar ◽

...

Keyword(s):

Temporal Distribution ◽

High Volume ◽

Amplicon Sequencing ◽

Urban Ecosystem ◽

Temporal Variations ◽

Urban Site ◽

Sample Collection ◽

Airborne Dust ◽

Air Sampler ◽

Spatio Temporal

Kuwait is a country with a very high dust loading; in fact it bears the world’s highest particulate matter concentration in the outdoor air. The airborne dust often has associated biological materials, including pathogenic microbes that pose a serious risk to the urban ecosystem and public health. This study has established the baseline taxonomic characterization of microbes associated with dust transported into Kuwait from different trajectories. A high volume air sampler with six-stage cascade impactor was deployed for sample collection at a remote as well as an urban site. Samples from three different seasons (autumn, spring and summer) were subjected to targeted amplicon sequencing. A set of ~ 50 and 60 bacterial and fungal genera, respectively, established the core air microbiome. The predominant bacterial genera (relative abundance ≥ 1%) were Brevundimonas (12.5%), Sphingobium (3.3%), Sphingopyxis (2.7%), Pseudomonas (2.5%), Sphingomonas (2.4%), Massilia (2.3%), Acidovorax (2.0%), Allorhizobium (1.8%), Halomonas (1.3%), and Mesorhizobium (1.1%), and the fungal taxa were Cryptococcus (12%) followed by Alternaria (9%), Aspergillus (7%), Candida (3%), Cladosporium (2.9%), Schizophyllum (1.6%), Fusarium (1.4%), Gleotinia (1.3%) and Penicillium (1.15%). Significant spatio-temporal variations were recorded in terms of relative abundances, α-diversities, and β-diversities of bacterial communities. The dissimilarities were less pronounced and instead the communities were fairly homogenous. Linear discrimant analysis revealed three fungal genera known to be significantly differentially abundant with respect to different size fractions of dust. Our results shed light on the spatio-temporal distribution of airborne microbes and their implications in general health.

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