Md Ataul Gani | Jagannath University (original) (raw)

Papers by Md Ataul Gani

Physicochemical and biological water quality data from a reference study station of the river Bur... more Physicochemical and biological water quality data from a reference study station of the river Buriganga measured fortnightly during 1994-1995 have been presented and compared with the results of other studies carried out during 1972-1973, 2003-2005, 2011 and 2012-2013 by different authors. During 1994-1995, a total of 10 dominant species of phytoplankton were quantified from the River Buriganga in different seasons. Melosira granulata (Ehrenberg) Ralfs (5-10400 × 10 3 ind/l), Oscillatoria chalybea (Mertens) Gomont (8-2660 × 10 3 ind/l) and Spirulina platensis (Nordst) Gomont (2-7480 × 10 3 ind/l) were present throughout the year. The other seven species which occurred sporadically were Cryptomonas obovata Czosnowski (423-3520 × 10 3 ind/l), Actinastrum hantzschi Lagerheim (123-119000 × 10 3 ind/l), Closterium limneticum Lemmermann (202-2300 × 10 3 ind/l), Ankistrodesmus falcatus (Corda) Ralfs (226-7140 × 10 3 ind/l), Scenedesmus dimorphus (Turp.) Kuetz. (7-2780 × 10 3 ind/l) and Euglena acus (Mueller) Ehr. (38-700 × 10 3 ind/l). The summer population was supported by high densities of M. granulata, O. chalybea, S. platensis and C. meneghiniana having larger bio-volumes compared to its winter counterparts (C. obovata, A. hantzschi and Ank. falcatus). Seasonal mean values of the planktonic potential primary productivity of the river ranged from 15-120 µgC/l/h with a chlorophyll a concentration of 2-142 µg/l. The maximum phytoplankton primary productivity in the river Buriganga was 4.92 times lesser than the River Padma at Mawa Ghat. Maximum assimilation rate (P/B) was found nearly double the greater than River Turag. The population density of zooplankton was almost same as that reported for Turag. Comparative analysis reveals no change in the water temperature and pH of the river water during 1972-2013. However, for the recorded maximum of each parameter, a reduction in the Secchi depth, NO 3-N, DO, phytoplankton species number and density was observed by factors of 3.5, 36.33, 3.5, 1.67 and 675.89, respectively. Alkalinity, TDS, SRS, SRP were increased by factors of 1.34, 3.49, 2.06, 2 and 12.57, respectively. During the period concerned, data on phytoplankton biomass as chlorophyll a was available only on two occasions i.e., during 1994-1995 and 2003-2005, which showed 1.13 times higher in the latter study. Enhanced eutrophication with reduced light climate as well as a shift in phytoplankton diversity has been found prevalent in the reference station of the river.

Comparative limnological analysis was done in association with different physicochemical variable... more Comparative limnological analysis was done in association with different physicochemical variables from the two lagoons. Cluster analysis separated the bloom forming phytoplankton into four groups and SIMPER analysis showed M. aeruginosa, Mer. glauca, Euglena sp. and A. platensis were responsible for each of the groupings. Result of PCA and regression analysis showed significant correlation of air temperature, water temperature, NO 3-N and SRP with A. platensis, Mer. glauca and Eulgena sp.

Results obtained in an investigation on Bangshal pond in old Dhaka, Bangladesh showed that highes... more Results obtained in an investigation on Bangshal pond in old Dhaka, Bangladesh showed that highest and lowest air and water temperatures were recorded during summer (30.73 and 30.44ºC) and winter (24.5 and 23.5ºC), respectively. Seasonal variation of secchi depth exhibited the highest and the lowest value during monsoon (68.81cm) and summer (57.83 cm), respectively. During summer mean seasonal value of TDS (341.48 mg/l), conductivity (2019.88 µS/cm), alkalinity (7.6 meq/l) and SRP (0.16 µg/) were maximum while the value of pH (7.5), SRS (0.244 mg/l), SRP (0.14 µg/l) were minimum during winter. Highest values of pH (7.9), SRS (0.297 mg/l) and NO 3-N (0.26 mg/l) were found during monsoon while lowest values of conductivity (530.99 µS/cm) and NO 3-N (0.06 mg/l) were recorded during autumn. Concentration of Chl a remained highest during autumn (116.39 µg/l) and lowest value during winter (88.79 µg/l) and for phaeophytin the highest concentration was obtained during summer (42.73 µg/l) and the lowest during monsoon (18.37 µg/l). A total of 122 phytoplankton species were recorded in the present study and highest phytoplankton count was obtained during autumn followed by monsoon, summer and winter. Results of PCA and correlation matrix showed that three phytoplankton species, namely Cryptomonas erosa, Arthrospira plantensis, Scenedesmus mainly were influenced by pH during monsoon period.

Nilsagar is located at Dhobdanga Mouza of Gorgram Union 14 km South-West of Nilphamari district h... more Nilsagar is located at Dhobdanga Mouza of Gorgram Union 14 km South-West of Nilphamari district headquarter. Its geographical location is 26000′12.45″ N and 88045′19.50″ E. The area of the water body is 21.50 ha having an average depth of 9.50 m. The entire Dighi is surrounded by brick walls. The area has been considered as tourist spot and declared as birds sanctuary by district administration.The recorded mean air temperature, water temperature, Sechhi depth, alkalinity, DO, pH, TDS and conductivity of the lake were 19.270C, 20.200C, 53 cm, 0.60 meq/l, 11.64 mg/l, 6.96, 32.00 mg/l and 126.33 µS/cm, respectively. The concentration of soluble reactive phosphorus and silicate was very low. Mean value of the former parameter was 6.80 µg/l and the latter was 0.67 mg/l. Nitrate-nitrogen concentration was remarkably low and showed 0.19 mg/l.

Eight newly recorded phtyoplankton belonging to the algal Order Volvocales, Chlorococcales, Penal... more Eight newly recorded phtyoplankton belonging to the algal Order Volvocales, Chlorococcales, Penales and Cryptomonadales from Bangladesh have been described in the present paper. The taxa are Collodictyon sparsavacuolatum Skuja, Tetrachloridium carteroides (Pascher et Jha) Huber-Pest., Chlamydomonas bicilliata Korsch., Chlorogonium liostracum Strehlow, Asterarcys cubensis Comas, Nitzschia hybrida Grun.,
Rhodomonas lens Pascher and Ruttner and R. ovalis Nygaard

Ramsagar, an artificial lake of Dinajpur district has been investigated limnologically. Mean alka... more Ramsagar, an artificial lake of Dinajpur district has been investigated limnologically. Mean alkalinity, DO, pH, TDS and conductivity of the lake were 0.50 meq/l, 7.99 mg/l, 6.73, 10.66 mg/l and 73.66 μS/cm, respectively. The concentration of soluble reactive phosphorus and silicate was very low. Mean value of the former parameter was 3.16 μg/l and the latter was 0.77 mg/l. Nitrate-nitrogen concentration was < 0.1 mg/l. Phytoplankton biomass as chl a was 5.92 μg/l and that of phaeopigment 3.65 μg/l. Phytoplankton flora of the
lake was found to be dominated by desmids. The dominant species were Staurastrum coarctatum var. subcurtum (59.35×104 ind/l); S. subgracillimum var. tortum (44.83×104 ind/l) and S. leptacanthum (29.06×104 ind/l). Among the blue-green algae, Anabaena utermöhlii was dominant. Chlorococcales was represented by seven species. The total density of phytoplankton was 163.53×104 ind/l. Considering the overall limnological characteristics, the lake could be characterized as acidic and nutrient poor.

Limnology of two wastewater treatment lagoons, (Lagoon numbers 1 and 10 are treated as L-1 and L-... more Limnology of two wastewater treatment lagoons, (Lagoon numbers 1 and 10 are treated as L-1 and L-2, respectively) at Pagla, Narayanganj considering 15 water quality variables had been carried out for 10 months. Air and water temperature did not vary significantly. Secchi depth (Zs) showed gradual improvement
from the lagoon 1 to lagoon 10 due to low loading of suspended matters. Improvement of water quality from L-1 to L-2 has also been observed in respect to alkalinity, conductivity and TDS. Similar trends were also seen for SRS and SRP. In L-1 anoxia occurred three times whereas it was absent in L-2. In the present study, improved DO prompted NO3-N and TDS concentration. However in L-2, mean values of SRP dropped by about 13% than L-1. A significant positive correlation between the density of phytoplankton and SRP in L-2 at 5% level was obtained. A total of 105 species of phytoplankton belonging to 6 different algal classes were recorded from the lagoons. Highest number of species was obtained from Chlorophyceae followed by Euglenophyceae, Bacillariophyceae, Cyanophyceae, Cryptophyceae and Dinophyceae. The population density of phytoplankton and that of zooplankton in L-1 was low compared to L-2. Higher number of genera and species occurred in L-2 than L-1. Chl a and pheopigment concentrations were also higher in L-2. Results indicated that water quality has increased in the treatment pond number 10.

Eight newly recorded species of Euglenophyceae from Bangladesh have been illustrated and describe... more Eight newly recorded species of Euglenophyceae from Bangladesh have been illustrated and described in the present paper. The species are Euglena fundoversata L.P. Johnson, E. korshikovii Gojdics, E. minuta Prescott, E. sacculiformis Schiller, Lepocinclis truncata Da Cunha, Phacus pusillus Lemn., P. strongylus Pochm. and P. wettsteini Drez.

Results of limnological investigation of lake Ashura showed that air and water temperatures were ... more Results of limnological investigation of lake Ashura showed that air and water temperatures were 31.5 ± 0.25ºC and 30.0 ± 0.45ºC, respectively in the month of April, 2011. pH, alkalinity, conductivity, dissolved oxygen and TDS of water were 7.11 ± 0.02, 2.96 ± 0.58 meq/l, 760.67 ± 8.08 µS/cm, 7.72 ± 0.41 mg/l and 104.67 ± 1.53 mg/l, respectively. The concentration of NO 3 -N, SRP and SRS were 63.33 ± 25.16 µg/l, 11.60 ± 1.60 µg/l and 14.36 ± 0.25 mg/l, respectively. Phytoplankton biomass as chl a and concentration of phaeopigment were 5.33 and 3.41 µg/l, respectively. The density of phytoplankton was 552.84 × 10 3 ind/l. A total of 35 species of phytoplankton were recorded of which 15 belonged to Euglenophyceae, followed by Chlorophyceae , Bacillariophyceae , Cyanophyceae (4) and Cryptophyceae (1). Macrophyte flora was represented by 31 species. The dominant species were Eichhornia crassipes (Mart.) Solms, Ludwigia adscendens (L.) Hara. and Oryza sativa L.

Bogakain, a natural high altitude (372 m) lake of Bangladesh has been limnologically investigated... more Bogakain, a natural high altitude (372 m) lake of Bangladesh has been limnologically investigated for the first time. At mid-point, the depth of the lake was measured 46.54 m and the Secchi visibility was 2.37 m. Water temperature from 1-10 m depth gradient showed slight stratification in the lake which varied from 27.0 -22.4° C at 1.00 pm. pH at the different depths ranged from 7.8 -9.1, conductivity from 75 -80 µS/cm and TDS from 39 -42 mg/l. Alkalinity ranged from 0.8 -1.24 meq/l and DO from 0.61 -11.39 mg/l. A total of 40 species of phytoplank-ton were recorded from the lake of which 21 belonged to Chlorophyceae followed by Cynaophyceae , Bacillariophyceae (4), Cryptophyceae (4), Euglenophyceae (3), Dinophyceae (2) and Chrysophyceae (1). Bloom by Synnechocystis salina Wisl was observed at 10 m depth. Water temperature correlated negatively and significantly with depth. Phytoplankton biomass as chl a correlated positively with phytoplankton density and water depth. The former variable showed negative correlation with pH and water temperature. Lake Bogakain is the deepest natural lake of Bangladesh and many of the previous concepts regarding the lake i.e., fishless, highly turbid water and it has got a thermal spring at the bottom was found invalid.

Conference Presentations by Md Ataul Gani

Ecological status for Gallikos River basin, according to the Water Framework Directive 2000/60/EC... more Ecological status for Gallikos River basin, according to the Water Framework Directive 2000/60/EC, was assessed during May 2013. Quality elements undertaken throughout the assessment were biological (benthic macroinvertebrates), hydro-morphological and physico-chemical data. Typology was extracted according to the System B as well as to the Intercali-brated Mediterranean River types (Decision 480/2013/EC). Water Quality was assessed according to Hellenic Evaluation System (HESY) and STAR–ICMi. Additionally, multivariable statistical analyses, Fuzzy clustering and PCA were performed in order to produce groups of sampling sites based on their similarity in macroinvertebrates abundances and correlate biological and environmental data, respectively. In situ measurements concerned physico-chemical parameters (pH, air and water temperature, river discharge etc.) while nutrients and TSS were analyzed in the lab. To assess the ecological quality of the riparian habitats, the extent and the severity of artificial modification to the physical structure of the channel and to evaluate physical aspects of the channels related to the heterogeneity of the habitats, Qualitat del Bosc de Ribera (QBR), Habitat Modification Score (HMS) and Índice de Hàbitat Fluvial (IHF) indices were estimated in situ. Pressures were expressed as emissions loads from point and non–point sources of pollution as well as morphological alterations. Gallikos River basin has less than moderate water quality (HESY) which leads to a respective ecological status. The impacts from morphological alterations are present in all the study area. An immediate programme of measures is needed in the case of morphological alterations and a long term programme of measures is needed from the perspective of pollution pressures.