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Trophic functioning of macrobenthic fauna in a tropical acidified Bornean estuary(Southeast Asia)

International Journal of Sediment Research 2019年第1期34卷 48-57页

作者： mohammad belal hossain Department of Fisheries and Marine Science Noakhali Science and Technology University

The trophic structure of a community is used to infer ecosystem functioning(e.g. energy transfer and nutrient cycling). Here the trophic structure of the benthic infaunal and epifaunal communities in the Brunei Estuary are characterized, and their distribution along an estuarine pH gradient is analyzed using univariate and multivariate techniques. This analysis revealed that surface deposit feeders(e.g., polychaetes) were numerically dominant within the infaunal communities whereas in the epifaunal communities filter feeders(e.g., bivalves) were highly abundant. Species richness for almost all trophic groups increased toward the lower estuary, except for omnivores in the epifaunal communities, which decreased markedly. Both Analysis of Variance(ANOVA) and Analysis of Similarities(ANOSIM) detected significant differences in the density of respective trophic groups among stations. Within infaunal communities, both Biological and Environmental procedure(BIO-ENV) and Canonical Correspondence Analysis(CCA) showed that trophic shifts were associated with environmental gradients. Surface-deposit feeders and omnivores were the most abundant macrobenthos of the upper estuary characterized by low salinity, low pH, and a higher percentage of mud particles. The proportion of filter feeders and carnivores increased with salinity/pH and sand. A more uniform distribution of trophic structure was found in the lower estuary, with high salinity and pH over sandy habitat. In contrast, within epifaunal trophic groups,the percentage of surface deposit feeders and omnivores declined, but filter feeders remarkably increased toward the sea. The proportion of carnivores remained similar at all stations. Non-Metric Multidimensional Scaling(nMDS) ordination for epifaunal trophic groups clearly demarcated higher salinity/pH stations from lower salinity/pH stations, suggesting different trophic compositions along the estuarine pH gradient.

关键词： Macrobenthic communities Trophic structure Environmental factors Acidity Tropical estuary

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Spatial distribution,source apportionment,and associated risks of trace metals (As,Pb,Cr,Cd,and Hg) from a subtropical river,Gomti,Bangladesh

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International Journal of Sediment Research 2022年第1期37卷 83-96页

作者： Abu Sayeed Shafiuddin Ahmed mohammad belal hossain Saad mohammad Omar Faruque Babu Moshiur Rahman Jun Sun mohammad Shafiqul Islam Sarker Department of Fisheries and Marine Science Noakhali Science and Technology University School of Engineering and Built Environment Griffith University College of Marine and Environmental Sciences Tianjin University of Science and Technology Forensic Science Laboratory Rapid Action Battalions Headquarters

Sediment samples from the Gomti River basin were investigated to determine and evaluate trace metal concentrations,their biological effect,and potential ecological and human health risks for adults and *** mean concentrations of trace metals were organized in the descending order of mercury（Hg）(0.08 mg/kg)>chromium （Cr）(0.06 mg/kg)>lead （Pb）(0.05 mg/kg)>arsenic （As）(0.02 mg/kg)>cadmium （Cd）(0.01 mg/kg).The current study illustrated that metals were attributed to the area from natural sources and different anthropogenic sources especially from ***,the concentration levels were lower than the sediment quality guidelines （SQGs） based on the effect-range classifications of threshold effect concentration （TEC） and probable effect concentration （PEC）.Therefore,the concentration of the elements showed no adverse biological effects on aquatic *** evaluated potential ecological risk index also revealed the low toxicity to the aquatic ***,the applied sediment quality indices,geo-accumulation index （Igeo）,contamination factor （CF）,and contamination severity index （CSI） suggested that the contamination levels of the elements were in the acceptable range,and the contamination had not notably impacted on the sediment *** risk index （HI） concerning age groups was significantly less than the threshold limit of 1 indicating that the contamination had no non-carcinogenic risk *** total carcinogenic risk （TCR） was less than a risk value of 1×***,the current study suggests that immediate remediation is not required due to an absence of alarming conditions in the study *** monitoring of the attribution of the metal elements should be done for the betterment of human and environmental health.

关键词： Trace metals Biological effects Ecological risk Human health risk Gomti river Bangladesh

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Assessment of heavy metal contamination in the sur?cial sediments from the lower Meghna River estuary, Noakhali coast, Bangladesh

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International Journal of Sediment Research 2021年第3期36卷 384-391页

作者： mohammad Abdul Momin Siddique Mahfuzur Rahman Shahriar Md.Arifur Rahman Md.Rubel Hassan Zeenath Fardous Muhammed Alamgir Zaman Chowdhury mohammad belal hossain Department of Oceanography Noakhali Science and Technology University Agrochemical and Environmental Research Division Institute of Food and Radiation Biology Atomic Energy Research Establishment 5. Department of Fisheries and Marine Science Noakhali Science and Technology University Department of Environmental Science and Disaster Management Noakhali Science and Technology University University of South Bohemia in Ceske Budejovice Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses Research Institute of Fish Culture and Hydrobiology

Sediment samples were collected from ten selected sites of the lower Meghna River estuary, and six heavy metals were analyzed with Atomic Absorption Spectrophotometry(AAS) to assess the contamination level and the metals’ association with sediment grain size. The current results revealed that the mean concentrations of the studied metals were ranked in descending order of iron(Fe)(1.29 ? 103 mg/kg) > zinc(Zn)(42.41 mg/kg) > lead(Pb)(12.48 mg/kg) > chromium(Cr)(10.59 mg/kg) > copper(Cu)(6.22 mg/kg) > cadmium(Cd)(0.28 mg/kg). The geo-accumulation, contamination, and pollution load indexes suggested that the lower Meghna river estuary was not contaminated by Fe, Zn, Pb, Cr, and *** mean size of the sediment ranged from 28.92 to 126.2 mm, and the Pearson correlation coefficient showed a significant association between Fe and Pb(coefficient of determination, r2? 0.836; p < 0.05),and no significant correlation was found between individual metals and grain size, indicating no or low influence on the metals distribution.

关键词： Metal pollution Pollution load index Grain size Trace metals

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Management of Wilt Complex of Eggplant (Solanum melongenaL.) Caused by Fusarium oxysporum, Ralstonia solanacearumand Meloidogynespp.

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American Journal of Plant Sciences 2021年第7期12卷 1155-1171页

作者： Nahid Akter mohammad Rafiqul Islam mohammad belal hossain mohammad Nazrul Islam Shukti Rani Chowdhury Sanzida Hoque Rakibul Hasan Nitol Rubina Tasnin Department of Plant Pathology Sher-e-Bangla Agricultural University Sher-e-Bangla Nagar Bangladesh Plant Pathology Division Bangladesh Agricultural Research Institute Joydebpur Bangladesh

Wilt complex disease of eggplant is a severe problem in Bangladesh as well as in the world. The pathogenic variability and their survival nature make the disease complex. The pathogen includes a fungus (Fusarium oxysporum), a bacterium (Ralstonia solanacearum) and a nematode (Meloidogyne spp.) that attack the plant individually or combinedly. The present investigation aimed to evaluate the integrated effects of different chemicals, poultry manure and Trichoderma harzianum to manage the disease. Carbendazim (Autostin 50WP), Streptomycin sulphate 9% and Tetracycline hydrochloride 1% (Krosin 10SP) and Carbofuran (Furadan 3G) were used as a fungicide, bactericide and nematicide, respectively which were integrated with poultry manure and Trichoderma harzianum resulting in sixteen treatments. The treatment efficacy varied significantly in comparison to control in respect of wilt incidence, yield and yield contributing characters. No wilt incidence was observed where Trichoderma harzianum was applied individually or in combination with Furadan 3G, Krosin 10SP, Autostin 50WP and poultry manure. The highest yield increase (300%) over control was noted in the treatment where Krosin 10SP, Furadan 3G,

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Tree species diversity in relation to environmental variables and disturbance gradients in a northeastern forest in Bangladesh

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Journal of Forestry Research 2019年第6期30卷 2143-2150页

作者： Md Anwar hossain Muha Abdullah Al Pavel Kazuhiro Harada Carl Beierkuhnlein Anke Jentsch mohammad belal Uddin Bangladesh Bank(Central Bank of Bangladesh) Khulna 9100Bangladesh Forest Research Centre(CEF) School of Agriculture(ISA)University of LisbonTapada da Ajuda1349-017 LisbonPortugal Graduate School of Bioagricultural Sciences Nagoya UniversityNagoya 464-8601Japan Department of Biogeography University of Bayreuth95447 BayreuthGermany Department of Disturbance Ecology University of Bayreuth95447 BayreuthGermany Department of Forestry and Environment Science School of Agriculture and Mineral SciencesShahjalal University of Science and TechnologySylhet 3114Bangladesh

Biodiversity has become an issue of global attention because of growing awareness of its importance and its rapid depletion *** of tree species in relation to environmental and disturbance gradients was examined in three managed *** were randomly sampled in a survey of 75 circular plots(radius=13 m)with 5 subplots(radius=1 m).Generalized linear model analysis was used with a Poisson distribution log link function to understand the effects of variables(organic matter,organic carbon,nitrogen,potassium,pH,elevation and disturbance)on tree species *** correspondence analysis was used to explore ecological relationships among *** result found that the stand characteristics was an important influencing factor in the three *** result showed that the variables had a highly positive influence on tree species richness in the three *** ordination,the selected variables governed the richness of tree *** study can help identify the most important factors that drive tree species richness in the three managed forests in Bangladesh and in similar ecosystems and inform forest management decisions for conservation according to ecological importance.

关键词： Richness Disturbance Forest conservation Lawachara National Park Reserve forest

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Complex impedance and electric modulus studies of magnetic ceramic Ni_(0.27)Cu_(0.10)Zn_(0.63)Fe_(2)O_(4)

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Journal of Advanced Ceramics 2015年第3期4卷 217-225页

作者： M.belal HOSSEN A.K.M.AKTHER hossain Department of Physics Chittagong University of Engineering and TechnologyChittagongBangladesh Department of Physics Bangladesh University of Engineering and TechnologyDhakaBangladesh

The electrical properties of Ni_(0.27)Cu_(0.10)Zn_(0.63)Fe_(2)O_(4)(NCZF)prepared from auto combustion synthesis of ferrite powders have been studied by impedance and modulus *** studied frequency and temperature dependencies of impedance and electric modulus of NCZF in a wide frequency range(20 Hz-5 MHz)at different measuring temperatures T_(SM)(30-225℃).The complex impedance spectra clearly showed both grain and grain boundary effects on the electrical *** observed impedance spectra indicated that the magnitude of grain boundary resistance R_(gb) becomes more prominent compared to grain resistance R_(b) at room temperature,and with the increase in T_(SM),R_(gb) decreases faster than the intrinsic R_(b).The frequency response of the imaginary part of impedance showed relaxation behavior at every T_(SM),and the relaxation frequency variation with T_(SM) appeared to be of Arrhenius nature and the activation energy has been estimated to be 0.37 eV.A complex modulus spectrum was used to understand the mechanism of the electrical transport process,which indicated that a non-Debye type of conductivity relaxation characterizes this material.

关键词： ferrimagnetic ceramics impedance spectroscopy electric modulus temperature dependence

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Impact of industrial effluent on growth and yield of rice(Oryza sativa L.) in silty clay loam soil

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Journal of Environmental Sciences 2015年第4期27卷 231-240页

作者： mohammad Anwar hossain Golum Kibria Muhammad Mustafizur Rahman mohammad Mizanur Rahman Abul hossain Molla mohammad Mostafizur Rahman mohammad Khabir Uddin Department of Environmental Sciences Jahangirnagar University Department of Soil Science Bangabandhu Sheikh Mujibur Rahman Agricultural University Department of Bioenvironmental Science Bangabandhu Sheikh Mujibur Rahman Agricultural University

Degradation of soil and water from discharge of untreated industrial effluent is alarming in Bangladesh. Therefore, buildup of heavy metals in soil from contaminated effluent, their entry into the food chain and effects on rice yield were quantified in a pot experiment. The treatments were comprised of 0, 25%, 50%, 75% and 100% industrial effluents applied as irrigation water. Effluents, initial soil, different parts of rice plants and post-harvest pot soil were analyzed for various elements, including heavy metals. Application of elevated levels of effluent contributed to increased heavy metals in pot soils and rice roots due to translocation effects, which were transferred to rice straw and grain. The results indicated that heavy metal toxicity may develop in soil because of contaminated effluent *** metals are not biodegradable, rather they accumulate in soils, and transfer of these metals from effluent to soil and plant cells was found to reduce the growth and development of rice plants and thereby contributed to lower yield. Moreover, a higher concentration of effluent caused heavy metal toxicity as well as reduction of growth and yield of rice, and in the long run a more aggravated situation may threaten human lives,which emphasizes the obligatory adoption of effluent treatment before its release to the environment, and regular monitoring by government agencies needs to be ensured.

关键词： Biomass Crop yield Heavy metal Industrial effluent Soil pollution

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Spatial and seasonal distribution of intertidal macrobenthos with their biomass and functional feeding guilds in the Naf River estuary, Bangladesh

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Journal of Oceanology and Limnology 2019年第3期37卷 1010-1023页

作者： Md. Abu NOMAN MAMUNUR Rashid M SHAHANUL Islam M. belal hossain College of Marine & Environmental Science Tianjin University of Science and TechnologyTianjin 300072China Department of Fisheries and Marine Science Noakhali Science and Technology UniversityBangladesh Faculty of Food Engineering and Biotechnology Tianjin University of Science and TechnologyTianjin 300457China

The Naf River estuary is one of the most productive ecological ecosystems in Bangladesh providing an important feeding area for fishes and other aquatic ***,detailed information on macrobenthic communities is rarely available in this *** study focused on the seasonal and spatial variability of macrobenthic community structure with their biomass and functional *** total,fortyseven taxa were identified under nine major groups and seven functional feeding *** macrobenthic taxa,Polychaeta was dominant in both seasons and all over the estuary contributing 60%of total *** mean abundance of macrobenthos was higher during the pre-monsoon(2 972±1 994 inds./m^2)than the monsoon(1 572±361 inds./m^2)being maximum at mid-estuary region and minimum at upper and lower estuary *** the diversity indices,density(P=0.01,P=0.003),the number of taxa(P=0.000 3,P=0.000 9)and Margalef′s Index(P=0.000 4,P=0.001)of macrobenthos were significantly different among stations and ***-Weiner index(P=0.009,P=0.12)and Pielou’s evenness index(P=0.03,P=0.14)had significant differences among stations but not among *** analysis suggested that distribution of macrofauna is strongly influenced by *** the feeding types,carnivorous were found to be dominant at the upper and mid-estuarine regions,and herbivorous were at lower estuarine *** species were dominant in both *** have shown to be the most abundant feeding type in terms of biomass though herbivores were highest during monsoon.

关键词： macrobenthos seasonal variation spatial variation feeding guilds biomass Naf River estuary

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Strategies to integrate the Mughal settlements in Old Dhaka

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Frontiers of Architectural Research 2013年第4期2卷 420-434页

作者： mohammad Sazzad hossain Department of Architecture Southeast University Dhaka 1208 Bangladesh

The Mughal settlements are an integral part of Old Dhaka. Uncontrolled urbanization, changes in land use patterns, the growing density of new settlements, and modern transportation have brought about rapid transformation to the historic fabric of the Mughal settlements. As a result, Mughal structures are gradually turning into isolated elements in the transforming fabric. This study aims to promote the historic quality of the old city through clear and sustainable integration of the Mughal settlements in the existing fabric. This study attempts to analyze the Mughal settlements in old Dhaka and correspondingly outline strategic approaches to protect Mughal artifacts from decay and ensure proper access and visual exposure in the present urban tissue.

关键词： Mughal settlement Urban transformation Integration

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Laboratory-and Field-Phenotyping for Drought Stress Tolerance and Diversity Study in Lentil (Lens culinaris Medik.)

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Phyton-International Journal of Experimental Botany 2021年第3期90卷 949-970页

作者： Shahida Akter Israt Jahan MdAmir hossain mohammad Anwar hossain Department of Genetics and Plant Breeding Bangladesh Agricultural UniversityMymensingh2202Bangladesh

Drought susceptibility and low genetic variability are the major constraints of lentil(Lens culinaris Medik.)production *** of an efficient pre-field drought phenotyping technique and identification of diversified drought tolerant lentil genotype(s)are therefore vital and *** separate experiments were conducted using thirty diverse lentil genotypes to isolate drought tolerant genotype(s)as well as to assess their *** both of the experiments,significant(p≤0.01)variation in genotype(G),treatment(T)and G X T was observed for most of the studied *** experiment I,genotypes were examined for drought tolerance at the seedlings stage under hydroponic conditions by assessing root and shoot *** the 30 genotypes studied,BM-1247,BM-1227 and BM-502 were selected as highly tolerant to drought stress as they showed maximum seedling survivability and minimum reduction in growth parameters under drought *** experiment II,the genotypes were assayed for diversity and drought stress tolerance based on morphological traits grown under field *** stress caused a substantial reduction in yield attributing traits,however,the genotypes BM-1247,BM-981,BM-1227 and BM-502 were categorized as drought tolerant genotypes with less than 20%yield *** field screening result of drought stress tolerance was coincided well with the results of laboratory *** divergence study reflected the presence of considerable diversity among the *** laboratory and field screening results,the genotypes,BM-1247,BM-1227,BM-981 and BM-502 were selected as the best drought tolerant *** information can be exploited for further breeding in developing drought tolerance in lentil.

关键词： Lentil water stress seedling survival yield attributing traits phenotypic diversity

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