Pub Date : 2023-07-20DOI: 10.3329/dujbs.v32i2.67678
T. Akter, Sm Tanjil Shah, Md. Arafat Al Mamun, M. Bari, S. Begum, N. Rahman, Md. Ibrahim Miah
Traditionally, inorganic chemical-based fertilizers is used for soil management strategies, which can cause public health and environmental threats. Alternatively, bio-fertilizer can be used to increase the productivity and sustainability of soil without causing environmental pollution. The present study aimed to cost-effectively produce bio-fertilizer using agricultural residues and determine the shelflife and efficacy of the bioinoculants. We used sterilized rice husk ash and alluvial soil (1:2) to prepare cost-effective carriers. Rhizobium sp., Azotobacter sp., and Trichoderma sp. were grown in a newly designed culture medium for economic production as bio-inoculants. The efficacy of the formulated bio-fertilizer was tested on a small scale, where it significantly improved the growth of the sponge gourd (Luffa aegyptiaca) plant (p<0.01). The formulated bio-fertilizers were stored at room temperature for one year. Initially, the total viable count of microorganisms was 8.0×107 CFU/g in the formulated bio-fertilizer. The total viable count of the bio-inoculants increased significantly after one month (2.2×108 CFU/g) and one year (2.2×109 CFU/g). Rice husk ash might have supported the growth and survival of the bioinoculants under room temperature (25°C) because of its nutrient retention capacity, adsorptive capability, and high content of silica. Therefore, this study suggests that sterile rice husk ash combined with alluvial soil can be used as a carrier for bio-fertilizers formulation with Rhizobium sp., Azotobacter sp., and Trichoderma sp. bioinoculants. Dhaka Univ. J. Biol. Sci. 32(2): 189-199, 2023 (July)
{"title":"Costeffective formulation of bio-fertilizer using agricultural residues as carriers and determination of shelflife of bio-fertilizer inoculants","authors":"T. Akter, Sm Tanjil Shah, Md. Arafat Al Mamun, M. Bari, S. Begum, N. Rahman, Md. Ibrahim Miah","doi":"10.3329/dujbs.v32i2.67678","DOIUrl":"https://doi.org/10.3329/dujbs.v32i2.67678","url":null,"abstract":"Traditionally, inorganic chemical-based fertilizers is used for soil management strategies, which can cause public health and environmental threats. Alternatively, bio-fertilizer can be used to increase the productivity and sustainability of soil without causing environmental pollution. The present study aimed to cost-effectively produce bio-fertilizer using agricultural residues and determine the shelflife and efficacy of the bioinoculants. We used sterilized rice husk ash and alluvial soil (1:2) to prepare cost-effective carriers. Rhizobium sp., Azotobacter sp., and Trichoderma sp. were grown in a newly designed culture medium for economic production as bio-inoculants. The efficacy of the formulated bio-fertilizer was tested on a small scale, where it significantly improved the growth of the sponge gourd (Luffa aegyptiaca) plant (p<0.01). The formulated bio-fertilizers were stored at room temperature for one year. Initially, the total viable count of microorganisms was 8.0×107 CFU/g in the formulated bio-fertilizer. The total viable count of the bio-inoculants increased significantly after one month (2.2×108 CFU/g) and one year (2.2×109 CFU/g). Rice husk ash might have supported the growth and survival of the bioinoculants under room temperature (25°C) because of its nutrient retention capacity, adsorptive capability, and high content of silica. Therefore, this study suggests that sterile rice husk ash combined with alluvial soil can be used as a carrier for bio-fertilizers formulation with Rhizobium sp., Azotobacter sp., and Trichoderma sp. bioinoculants.\u0000Dhaka Univ. J. Biol. Sci. 32(2): 189-199, 2023 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73479005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3329/dujbs.v32i2.67679
Tamanna Tahmid Turna, Mahmud Syed, M. Rahman
To evaluate the integrated effect of vermicompost, phosphorous, and zinc fertilizer on plant yield and nutritional quality of cucumber (Cucumis sativus L.), a pot experiment was conducted in the net house at Soil, Water, and Environment Department of the University of Dhaka. In this study, eight treatments viz. T1: control, T2: VC6 t ha-1, T3: P25 kg ha-1, T4: Zn1.5 kg ha-1, T5: VC6 t ha-1 + P25 kg ha-1, T6: VC6 t ha-1 + Zn1.5 kg ha-1, T7: P25 kg ha-1 + Zn1.5 kg ha-1, T8: VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 with three replicates were used by following a completely randomized design (CRD). A one-way ANOVA with a Tukey posthoc test revealed statistically significant differences in growth and yield metrics between the treatments (p ≤ 0.05). The maximum growth and yield contributing attributes viz. plant height (123 cm), leaf number (30 plant-1), leaf area (155.45 cm2), stem girth (2.70 cm), branch number (18 plant-1), fruit number (7 plant-1), and fruit fresh (382 g) and dry (33 g) weight were detected in the treatment VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 (T8). The treatment T1 (control) exhibited the lowest values for all the aforementioned treatments. The nutrient quality attributes in fruits were analyzed highest in the same treatment T8. So, farmers are advised to apply VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 in their fields because it can help make land management and cucumber production more sustainable. Dhaka Univ. J. Biol. Sci. 32(2): 201-210, 2023 (July)
为评价蚯蚓堆肥、磷、锌综合施用对黄瓜产量和营养品质的影响，在达卡大学土壤、水与环境系的网房中进行了盆栽试验。试验采用完全随机设计(CRD)，共8个处理，分别为T1:对照、T2: VC6 t ha-1、T3: P25 kg ha-1、T4: Zn1.5 kg ha-1、T5: VC6 t ha-1 + P25 kg ha-1、T6: VC6 t ha-1 + Zn1.5 kg ha-1、T7: P25 kg ha-1 + Zn1.5 kg ha-1、T8: VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1，共3个重复。单因素方差分析和Tukey事后检验显示，处理间生长和产量指标差异有统计学意义(p≤0.05)。VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 (T8)处理的最大生长和产量贡献属性为株高(123 cm)、叶数(30株-1)、叶面积(155.45 cm2)、茎长(2.70 cm)、枝数(18株-1)、果数(7株-1)、果实鲜重(382 g)和干重(33 g)。处理T1(对照)在上述所有处理中表现出最低的值。果实营养品质性状以T8处理最高。因此，建议农民在田间施用VC6 + P25 kg ha-1 + Zn1.5 kg ha-1，有助于提高土地管理和黄瓜生产的可持续性。达卡大学。科学学报，32(2):201- 210,2023 (July)
{"title":"Productivity and nutrient composition of cucumber (Cucumis sativus L.) grown under integrated application of vermicompost, phosphorous and zinc fertilizers","authors":"Tamanna Tahmid Turna, Mahmud Syed, M. Rahman","doi":"10.3329/dujbs.v32i2.67679","DOIUrl":"https://doi.org/10.3329/dujbs.v32i2.67679","url":null,"abstract":"To evaluate the integrated effect of vermicompost, phosphorous, and zinc fertilizer on plant yield and nutritional quality of cucumber (Cucumis sativus L.), a pot experiment was conducted in the net house at Soil, Water, and Environment Department of the University of Dhaka. In this study, eight treatments viz. T1: control, T2: VC6 t ha-1, T3: P25 kg ha-1, T4: Zn1.5 kg ha-1, T5: VC6 t ha-1 + P25 kg ha-1, T6: VC6 t ha-1 + Zn1.5 kg ha-1, T7: P25 kg ha-1 + Zn1.5 kg ha-1, T8: VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 with three replicates were used by following a completely randomized design (CRD). A one-way ANOVA with a Tukey posthoc test revealed statistically significant differences in growth and yield metrics between the treatments (p ≤ 0.05). The maximum growth and yield contributing attributes viz. plant height (123 cm), leaf number (30 plant-1), leaf area (155.45 cm2), stem girth (2.70 cm), branch number (18 plant-1), fruit number (7 plant-1), and fruit fresh (382 g) and dry (33 g) weight were detected in the treatment VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 (T8). The treatment T1 (control) exhibited the lowest values for all the aforementioned treatments. The nutrient quality attributes in fruits were analyzed highest in the same treatment T8. So, farmers are advised to apply VC6 t ha-1 + P25 kg ha-1 + Zn1.5 kg ha-1 in their fields because it can help make land management and cucumber production more sustainable.\u0000Dhaka Univ. J. Biol. Sci. 32(2): 201-210, 2023 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76528761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3329/dujbs.v32i2.67681
A. Khatun, S. Shamsi, M. Bashar
Cotton seeds of susceptible variety CB10 were inoculated with nine pathogenic fungi viz., Aspergillus flavus, A. niger, A. tamarii, Colletotrichum gloeosporioides, Curvularia lunata, Fusarium nivale, F. moniliforme, Mucor sp. and Rhizoctonia solani. Seedlings were grown in water agar test tube and in earthen pots. In water agar test, R. solani showed the highest percentage of seed to seedling transmission (35.27%) which was followed by F. moniliforme (31.29%) and A. niger showed the lowest (8.03%) transmission. Germination percentage of control seeds was 90.32% whereas in pathogen inoculated seeds it varied from 58.33 to 89.07%. The seedling mortality percentage was highest in R. solani (46.68%) and lowest in C. gloeosporioides (18.67%). Germination percentage of control seeds in pot was 99% whereas in pathogen inoculated seeds it varied from 43.37 to 84.34%. The seedling mortality percentage was highest in F. moniliforme (48.28%) and lowest in A. niger (19.64%). Percentage of seed to seedling transmission of fungi varied from 17.85% (A. niger) to 46.56% (F. moniliforme). Dhaka Univ. J. Biol. Sci. 32(2): 225-232, 2023 (July)
{"title":"Transmission of pathogenic fungi from seeds to seedlings in cotton (Gossypium hirsutum L.)","authors":"A. Khatun, S. Shamsi, M. Bashar","doi":"10.3329/dujbs.v32i2.67681","DOIUrl":"https://doi.org/10.3329/dujbs.v32i2.67681","url":null,"abstract":"Cotton seeds of susceptible variety CB10 were inoculated with nine pathogenic fungi viz., Aspergillus flavus, A. niger, A. tamarii, Colletotrichum gloeosporioides, Curvularia lunata, Fusarium nivale, F. moniliforme, Mucor sp. and Rhizoctonia solani. Seedlings were grown in water agar test tube and in earthen pots. In water agar test, R. solani showed the highest percentage of seed to seedling transmission (35.27%) which was followed by F. moniliforme (31.29%) and A. niger showed the lowest (8.03%) transmission. Germination percentage of control seeds was 90.32% whereas in pathogen inoculated seeds it varied from 58.33 to 89.07%. The seedling mortality percentage was highest in R. solani (46.68%) and lowest in C. gloeosporioides (18.67%). Germination percentage of control seeds in pot was 99% whereas in pathogen inoculated seeds it varied from 43.37 to 84.34%. The seedling mortality percentage was highest in F. moniliforme (48.28%) and lowest in A. niger (19.64%). Percentage of seed to seedling transmission of fungi varied from 17.85% (A. niger) to 46.56% (F. moniliforme).\u0000Dhaka Univ. J. Biol. Sci. 32(2): 225-232, 2023 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80388790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3329/dujbs.v32i2.67680
Sm Tanjil Shah, Umme Habiba Ria, A. A. Mamun, Md. Ibrahim Miah, S. R. Rahman, Md. Majibur Rahman
This research isolated and characterized indigenous Saccharomyces cerevisiae strains. Additionally, this study optimized fermentation conditions for the potential yeast strains and compared their leavening efficacy and biomass production with locally available commercial dried yeast (DY1) in Bangladesh. A total of thirty-five yeast strains were isolated from twenty-five indigenous fruit samples such as Mango (Mangifera indica L.), Jackfruit (Artocarpus heterophyllus Lam.), Papaya (Carica papaya L.), Litchi (Litchi chinensis Sonn.) and Banana (Musa oranta Roxb.). Based on bread leavening efficacy, four potential baker’s yeast strains (Man5, Ban2, Man9, and Ban5) were selected for characterization as potential baker’s yeast. Based on biochemical properties, API kit-based identification, and PCR-based molecular identification, all newly isolated yeast strains were identified as S. cerevisiae. None of these isolates produced H2S. Man5 and Ban5 isolates flocculated at a level comparable to the DY1. All strains showed better temperature tolerance (up to 45°C) than DY1. Man5 and Man9 also showed maximum ethanol tolerance (up to 16%). Only DY1 and Man5 increased dough volume significantly compared with other strains (p< 0.05). Notably, in the optimized growth condition, the Man5 strain produced the highest biomass significantly compared with others (p< 0.05). From the present study, it is concluded that the indigenous strain Man5, Man9, and Ban5 have the potential to be used in the industry as a substitute for imported baker’s yeast in Bangladesh and that will save a substantial amount of foreign currency. Dhaka Univ. J. Biol. Sci. 32(2): 211-223, 2023 (July)
{"title":"Characterization of indigenous Saccharomyces cerevisiae strains for their potential use as Baker’s yeast","authors":"Sm Tanjil Shah, Umme Habiba Ria, A. A. Mamun, Md. Ibrahim Miah, S. R. Rahman, Md. Majibur Rahman","doi":"10.3329/dujbs.v32i2.67680","DOIUrl":"https://doi.org/10.3329/dujbs.v32i2.67680","url":null,"abstract":"This research isolated and characterized indigenous Saccharomyces cerevisiae strains. Additionally, this study optimized fermentation conditions for the potential yeast strains and compared their leavening efficacy and biomass production with locally available commercial dried yeast (DY1) in Bangladesh. A total of thirty-five yeast strains were isolated from twenty-five indigenous fruit samples such as Mango (Mangifera indica L.), Jackfruit (Artocarpus heterophyllus Lam.), Papaya (Carica papaya L.), Litchi (Litchi chinensis Sonn.) and Banana (Musa oranta Roxb.). Based on bread leavening efficacy, four potential baker’s yeast strains (Man5, Ban2, Man9, and Ban5) were selected for characterization as potential baker’s yeast. Based on biochemical properties, API kit-based identification, and PCR-based molecular identification, all newly isolated yeast strains were identified as S. cerevisiae. None of these isolates produced H2S. Man5 and Ban5 isolates flocculated at a level comparable to the DY1. All strains showed better temperature tolerance (up to 45°C) than DY1. Man5 and Man9 also showed maximum ethanol tolerance (up to 16%). Only DY1 and Man5 increased dough volume significantly compared with other strains (p< 0.05). Notably, in the optimized growth condition, the Man5 strain produced the highest biomass significantly compared with others (p< 0.05). From the present study, it is concluded that the indigenous strain Man5, Man9, and Ban5 have the potential to be used in the industry as a substitute for imported baker’s yeast in Bangladesh and that will save a substantial amount of foreign currency.\u0000Dhaka Univ. J. Biol. Sci. 32(2): 211-223, 2023 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"2016 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88267770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-20DOI: 10.3329/dujbs.v32i2.67676
M. Rahman, Muhammad Alif Alauddin
Covid-19 has caused significant distress around the globe. Apart from the evident physical symptoms in infected cases, it has caused serious damage to public mental health. The current research is an attempt to explore mental health and psychological distress of the Covid-19 frontline workers. One hundred and seventy-seven Covid frontline workers (88 male and 89 female) were asked to complete a questionnaire with questions about symptoms of depression, anxiety, stress, and mental health. The questionnaire included Depression, Anxiety and Stress Scales (DASS-21) and the Bangla version of the General Health Questionnaire (GHQ-12). The results revealed that mental health was negatively correlated with stress, anxiety, and depression. Both male and female frontline workers reported mild to moderate levels of depression, anxiety, and stress. Females reported significantly higher stress than males. However, frontline workers from different professions did not differ significantly on depression, anxiety, stress, and mental health. The findings point to develop strategy to support the mental health of frontline workers including designing psychological support and resilience-building interventions based on risk factors. Dhaka Univ. J. Biol. Sci. 32(2): 167-177, 2023 (July)
{"title":"Mental health and psychological distress among Covid-19 frontline workers","authors":"M. Rahman, Muhammad Alif Alauddin","doi":"10.3329/dujbs.v32i2.67676","DOIUrl":"https://doi.org/10.3329/dujbs.v32i2.67676","url":null,"abstract":"Covid-19 has caused significant distress around the globe. Apart from the evident physical symptoms in infected cases, it has caused serious damage to public mental health. The current research is an attempt to explore mental health and psychological distress of the Covid-19 frontline workers. One hundred and seventy-seven Covid frontline workers (88 male and 89 female) were asked to complete a questionnaire with questions about symptoms of depression, anxiety, stress, and mental health. The questionnaire included Depression, Anxiety and Stress Scales (DASS-21) and the Bangla version of the General Health Questionnaire (GHQ-12). The results revealed that mental health was negatively correlated with stress, anxiety, and depression. Both male and female frontline workers reported mild to moderate levels of depression, anxiety, and stress. Females reported significantly higher stress than males. However, frontline workers from different professions did not differ significantly on depression, anxiety, stress, and mental health. The findings point to develop strategy to support the mental health of frontline workers including designing psychological support and resilience-building interventions based on risk factors.\u0000Dhaka Univ. J. Biol. Sci. 32(2): 167-177, 2023 (July)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75267681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64191
Rahana Yeasmin, M. Saha
This study aimed to isolate biotechnologically important enzyme like amylase and protease producing rhizobacteria from rhizospheric soil. Soil samples were collected from the rhizospherc of five different flowering plants from Curzon hall, University of Dhaka. A good number of bacteria were isolated. Among them 12 bacterial isolates were selected for detailed study based on their amylolytic and proteolytic activity. Starch hydrolysis ratio (SHR) of the studied isolates ranged in between 2.06 and 4.67, casein hydrolysis ratio (CHR) ranged in between 2.27 and 3.92. All the selected isolateswere Gram positive and rod shaped and provisionally identified as the member of the genus Bacillus with five different species viz. Bacillus alcalophilus, B. subtilis, B. pumilus, B. firmus and B. lentus. Amylase and protease production of the studied bacteria were estimated and it was ranged in between 29.11±9.57 to 35.78 ± 9.05 and 230.27±37.08 to 276.47 ± 55.01 U/ml. The highest amylase and protease producer were Bacillus alcalophilus (Ce104/S9/L) which could produce 35.78 ± 9.05 U/ml and Bacillus subtilis (Ca71/S5/L) could produce 276.47 ± 55.01 U/ml of protease, respectively. Maximum production of both amylase and protease was achieved in 24 h of incubation period at 37°C and pH 7.0. Dhaka Univ. J. Biol. Sci. 32(1): 65-71, 2023 (January)
{"title":"Isolation of biotechnologically important enzyme producing Rhizobacteria from seasonal flower beds","authors":"Rahana Yeasmin, M. Saha","doi":"10.3329/dujbs.v32i1.64191","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64191","url":null,"abstract":"This study aimed to isolate biotechnologically important enzyme like amylase and protease producing rhizobacteria from rhizospheric soil. Soil samples were collected from the rhizospherc of five different flowering plants from Curzon hall, University of Dhaka. A good number of bacteria were isolated. Among them 12 bacterial isolates were selected for detailed study based on their amylolytic and proteolytic activity. Starch hydrolysis ratio (SHR) of the studied isolates ranged in between 2.06 and 4.67, casein hydrolysis ratio (CHR) ranged in between 2.27 and 3.92. All the selected isolateswere Gram positive and rod shaped and provisionally identified as the member of the genus Bacillus with five different species viz. Bacillus alcalophilus, B. subtilis, B. pumilus, B. firmus and B. lentus. Amylase and protease production of the studied bacteria were estimated and it was ranged in between 29.11±9.57 to 35.78 ± 9.05 and 230.27±37.08 to 276.47 ± 55.01 U/ml. The highest amylase and protease producer were Bacillus alcalophilus (Ce104/S9/L) which could produce 35.78 ± 9.05 U/ml and Bacillus subtilis (Ca71/S5/L) could produce 276.47 ± 55.01 U/ml of protease, respectively. Maximum production of both amylase and protease was achieved in 24 h of incubation period at 37°C and pH 7.0.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 65-71, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89048915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64188
Makidul Islam Khan, Albert K. Smith, Most. Nilufa Yeasmin, M. Islam
Bangladesh government has imposed a 65-day marine fishing ban since 2015 to conserve marine fisheries, particularly to boost hilsa (Tenualosa ilisha) production. However, the ecological impacts of the marine fishing bans on water quality and hilsa’s growth are not assessed yet. Thus, this study aims to contribute here using data from coastal waters and fish from pre-contacted fishers in the Nijhum Dwip seascape during and outside the fishing ban in 2021 – 2022. Data were analyzed using R software. The measured mean dissolved oxygen, temperature, pH, electrical conductivity, total dissolved solids, and transparency of the sample water were 7.1 ± 1.13 mg/l, 31.1 ± 0.71°C, 8.45 ± 0.07, 40000 ± 2828 μS/cm, 18000 ± 1414 mg/L and 63.5 ± 2.12 cm at 1 week prior to the ban ends (July) and 8.45 ± 0.21 mg/l, 22.35 ± 0.49°C, 8.45 ± 0.07, 20500 ± 1060.66 μS/cm, 10350 ± 212.13 mg/l and 63.5 ± 7.78 cm before the ban starts (February). The values might be varied due to seasonal differences. The mean length (38 cm) and weight (601 g) of sampled hilsa during the ban periodwere comparatively larger than the mean length (29 cm) and weight (229 g) of hilsa which were sampled during the outside fishing ban period. Therefore, this study concludes that the marine fishing ban has positive impact on the growth and size of hilsa. This study suggests that further research is required to assess the fishing ban’s impact on the growth and production of other coastal and marine fish species across the Bay of Bengal. Dhaka Univ. J. Biol. Sci. 32(1): 33-43, 2023 (January)
{"title":"Impacts of marine fishing ban on the ecology of hilsa In the Nijhum Dwip Seascape in Bangladesh","authors":"Makidul Islam Khan, Albert K. Smith, Most. Nilufa Yeasmin, M. Islam","doi":"10.3329/dujbs.v32i1.64188","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64188","url":null,"abstract":"Bangladesh government has imposed a 65-day marine fishing ban since 2015 to conserve marine fisheries, particularly to boost hilsa (Tenualosa ilisha) production. However, the ecological impacts of the marine fishing bans on water quality and hilsa’s growth are not assessed yet. Thus, this study aims to contribute here using data from coastal waters and fish from pre-contacted fishers in the Nijhum Dwip seascape during and outside the fishing ban in 2021 – 2022. Data were analyzed using R software. The measured mean dissolved oxygen, temperature, pH, electrical conductivity, total dissolved solids, and transparency of the sample water were 7.1 ± 1.13 mg/l, 31.1 ± 0.71°C, 8.45 ± 0.07, 40000 ± 2828 μS/cm, 18000 ± 1414 mg/L and 63.5 ± 2.12 cm at 1 week prior to the ban ends (July) and 8.45 ± 0.21 mg/l, 22.35 ± 0.49°C, 8.45 ± 0.07, 20500 ± 1060.66 μS/cm, 10350 ± 212.13 mg/l and 63.5 ± 7.78 cm before the ban starts (February). The values might be varied due to seasonal differences. The mean length (38 cm) and weight (601 g) of sampled hilsa during the ban periodwere comparatively larger than the mean length (29 cm) and weight (229 g) of hilsa which were sampled during the outside fishing ban period. Therefore, this study concludes that the marine fishing ban has positive impact on the growth and size of hilsa. This study suggests that further research is required to assess the fishing ban’s impact on the growth and production of other coastal and marine fish species across the Bay of Bengal.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 33-43, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89930011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64194
M. S. Rahman, S. Hoque, M. Jahiruddin, Mohammad Sabbir Hossen
The soils of Ganges River Floodplain (GRFP), an important crop growing zone of the country, are known to be widely deficient in micronutrients. The study was conducted to relate the distribution and the fate of soil micronutrients in relation to land type, soil properties and cropping practices in GRFP.A total of 52 locations were selected for sample collection from across GRFP, varied in land type, soil series and cropping pattern, and analysed for DTPA extractable iron (Fe), manganese (Mn), copper (Cu), zinc (Zn) and hot water soluble boron (B). Most of the samples were found deficient in Zn and B, while a moderate number of samples were Fedeficient. The major reason of micronutrient deficiency was found to be high soil pH. Among the four soil series studied, Ghior series was most deficient in Zn and B, implying pedogenic differences among the soils. Significant effect of contrasting land types on the distribution of soil micronutrients was observed although the effect was not consistent. The rice-rice cropping pattern was found to have slightly higher contents of Mn, Zn and B compared to rice-non-rice pattern which might be due to longer submergence period in the soils under rice-rice pattern. Dhaka Univ. J. Biol. Sci. 32(1): 91-105, 2023 (January)
{"title":"Influence of land type and cropping on the distribution of micronutrients in Ganges river floodplain soils of Bangladesh","authors":"M. S. Rahman, S. Hoque, M. Jahiruddin, Mohammad Sabbir Hossen","doi":"10.3329/dujbs.v32i1.64194","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64194","url":null,"abstract":"The soils of Ganges River Floodplain (GRFP), an important crop growing zone of the country, are known to be widely deficient in micronutrients. The study was conducted to relate the distribution and the fate of soil micronutrients in relation to land type, soil properties and cropping practices in GRFP.A total of 52 locations were selected for sample collection from across GRFP, varied in land type, soil series and cropping pattern, and analysed for DTPA extractable iron (Fe), manganese (Mn), copper (Cu), zinc (Zn) and hot water soluble boron (B). Most of the samples were found deficient in Zn and B, while a moderate number of samples were Fedeficient. The major reason of micronutrient deficiency was found to be high soil pH. Among the four soil series studied, Ghior series was most deficient in Zn and B, implying pedogenic differences among the soils. Significant effect of contrasting land types on the distribution of soil micronutrients was observed although the effect was not consistent. The rice-rice cropping pattern was found to have slightly higher contents of Mn, Zn and B compared to rice-non-rice pattern which might be due to longer submergence period in the soils under rice-rice pattern.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 91-105, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88172828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64185
Makidul Islam Khan, Tanjila Akter Nipa, Habiba Moshfeka, Aparna Barman, M. Islam
Small rivers are often ignored in terms of conservation actions and biodiversity management in Bangladesh. Despite having significant ecological and economic importance of these rivers, there is limited study done so far. To partially fulfill this gap, this study aimed to assess the fish and shellfish biodiversity of a small coastal river named Tiakhali from southern Bangladesh. A total of 26 finfish and 7 shellfish species were identified where 50% of finfish and all of the shellfish species were from the order Perciformes and Decapoda, respectively. Results showed that 76.9% of finfish and all of the shellfish species were categorized into the least concern category based on IUCN Red List. Estimated Shannon’s, Margalef’s, Buzas & Gibson’s and Simpson’s indices were 1.189, 2.649, 0.435 and 0.435 for fish and 1.662, 0.758, 0.224 and 0.224 for shellfish, respectively. This study showed that Tiakhali river’s fish biodiversity was comparatively smaller than big rivers. The findings of this study might serve as a baseline for future works and will help policymakers to pay attention to conserve such small rivers and their biodiversity in future. Dhaka Univ. J. Biol. Sci. 32(1): 1- 10, 2023 (January)
{"title":"Ichthyodiversity of a small coastal river in Bangladesh","authors":"Makidul Islam Khan, Tanjila Akter Nipa, Habiba Moshfeka, Aparna Barman, M. Islam","doi":"10.3329/dujbs.v32i1.64185","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64185","url":null,"abstract":"Small rivers are often ignored in terms of conservation actions and biodiversity management in Bangladesh. Despite having significant ecological and economic importance of these rivers, there is limited study done so far. To partially fulfill this gap, this study aimed to assess the fish and shellfish biodiversity of a small coastal river named Tiakhali from southern Bangladesh. A total of 26 finfish and 7 shellfish species were identified where 50% of finfish and all of the shellfish species were from the order Perciformes and Decapoda, respectively. Results showed that 76.9% of finfish and all of the shellfish species were categorized into the least concern category based on IUCN Red List. Estimated Shannon’s, Margalef’s, Buzas & Gibson’s and Simpson’s indices were 1.189, 2.649, 0.435 and 0.435 for fish and 1.662, 0.758, 0.224 and 0.224 for shellfish, respectively. This study showed that Tiakhali river’s fish biodiversity was comparatively smaller than big rivers. The findings of this study might serve as a baseline for future works and will help policymakers to pay attention to conserve such small rivers and their biodiversity in future.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 1- 10, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84889119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-19DOI: 10.3329/dujbs.v32i1.64190
Antara Das Antu, Fariea Bakul
Autonomy and cognitive emotion regulation both are important aspects of adolescent years. Previous research also indicates that an individual’s cognitive emotion regulation (CER) and autonomy is correlated. The present study aimed to gain more insight into the relationship between autonomy and cognitive emotion regulation of Bangladeshi adolescents. Cross sectional survey design was used covering 100 adolescents having an age range of 12-15 years of age for data collection. Participants completed the questionnaires including a demographic questionnaire, adolescent autonomy questionnaire and cognitive emotion regulation questionnaire. Correlation analysis suggests that autonomy support showed an increase in the adaptive emotion regulation. Regression analysis models revealed that adolescent autonomy significantly explained 14.6% of variance for adaptive emotion regulation, and 4.6% of variance for less adaptive emotion regulation. Findings from the present study embodied that Bangladeshi adolescents use more adaptive cognitive regulation than maladaptive emotion regulation. These findings have implications for parents, primary caregivers, child psychologists, and other relevant professionals who are and will be working with children/ adolescents in helping them to learn and enhance their autonomy for their future and effective cognitive regulation of emotion. Dhaka Univ. J. Biol. Sci. 32(1): 57-64, 2023 (January)
{"title":"The relationship between autonomy and cognitive emotion regulation among adolescents","authors":"Antara Das Antu, Fariea Bakul","doi":"10.3329/dujbs.v32i1.64190","DOIUrl":"https://doi.org/10.3329/dujbs.v32i1.64190","url":null,"abstract":"Autonomy and cognitive emotion regulation both are important aspects of adolescent years. Previous research also indicates that an individual’s cognitive emotion regulation (CER) and autonomy is correlated. The present study aimed to gain more insight into the relationship between autonomy and cognitive emotion regulation of Bangladeshi adolescents. Cross sectional survey design was used covering 100 adolescents having an age range of 12-15 years of age for data collection. Participants completed the questionnaires including a demographic questionnaire, adolescent autonomy questionnaire and cognitive emotion regulation questionnaire. Correlation analysis suggests that autonomy support showed an increase in the adaptive emotion regulation. Regression analysis models revealed that adolescent autonomy significantly explained 14.6% of variance for adaptive emotion regulation, and 4.6% of variance for less adaptive emotion regulation. Findings from the present study embodied that Bangladeshi adolescents use more adaptive cognitive regulation than maladaptive emotion regulation. These findings have implications for parents, primary caregivers, child psychologists, and other relevant professionals who are and will be working with children/ adolescents in helping them to learn and enhance their autonomy for their future and effective cognitive regulation of emotion.\u0000Dhaka Univ. J. Biol. Sci. 32(1): 57-64, 2023 (January)","PeriodicalId":11095,"journal":{"name":"Dhaka University Journal of Biological Sciences","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81047111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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