Indigenous medicinal plants were conducted during July 2013 to June 2015 in sadar upazila of Naogaon district, Bangladesh. The objective of the study was to document medicinal plant species of the study area and associated indigenous knowledge. A total of 84 plant species belonging to 76 genera and 45 families were collected which are used for the treatment of 55 categories of diseases. Many plants are used by them for the treatment of various diseases like asthma, abscess, constipation, cough, fever, diarrhoea, dysentery, diuretic, diabetes, eczema, itches, jaundice, skin disease, vomiting, wound and worm. A number of scientific investigations have highlighted the importance and the contribution of many plant families i.e.

Interglacial beds from the Don Valley briclcyard a t Toronto were sampled systematically for diatoms. In 34 samples, 11 contained diatoms, and a total of about 200 species and varieties were identified. The dominant species are Tabellaria fenestrata (Lyng.) Kiitz, Opephora ntartyi Heribaud, Cocconeis disczrl~ls var. dimitzllta (Pant.) A. CI., A~ttphora proteus Greg., and Achnanthes clevei Grun. T h e overall assemblage suggests deposition in a freshwater estuary in alkaline, mesotrophic, or eutrophic water. The variation in ecologic composition of the samples indicated shifting of the river channel or repeated shallowing and deepening of the estuary. With some exceptions, the diatom flora is typical of temperate North America today, but the lack of knowledge of the extant diatom flora precludes a closer comparison.

Purpose: The aims to investigate the angiosperm taxa in the study area. The present research also documented the species diversity and important medicinal plants.  Subjects and Methods: Angiosperm flora in the Chaar Khidirpur area of Rajshahi, Bangladesh was carried out from November 2018 to October 2019 to cover the seasonal variations. Plant parts with either flower or fruits collected using traditional herbarium techniques to make voucher specimens for documentation.  Results: The result focused that a total of 210 species belonging to177 genera under 71 families were recorded. Forty-five (45) medicinal plants were used for the treatment of more than 61 diseases. Conclusion: The present study was the first time to report angiosperm diversity and medicinal plants in the study area. In this research, the status of occurrence has been recorded for proper conservation management and sustainable utilization of the taxa resulting in 81.33% being common, 16.74% as rare and 1.91% are found as threatened in the study area.

Diversity angiosperm climber species in Rajshahi region, Bangladesh was carried out from January 2015 to November 2019. An extensive floristic survey an angiosperm climbers and collection have been made throughout the study area. A total of 88 species belonging to 55genera under 25 families were recorded. Distribution of angiosperm plant species in the families shows variation. The family Cucurbitaceae is represented by 27 species. Fabaceae is represented by 12 species. Convolvulaceae is represented by 9 species. A single species is represented by 13 families while 2 to 4 species is represented by 9 families. Out of 88 species, 53.40% species was common and 46.59% was rare species in the study area. For each species scientific name, local name, family, flowering and fruiting time and status of occurrence are provided with specimen citation.

Purpose: The aim is to study the condition of aquatic species in the Charia beel. A good management technique is developed for protecting biodiversity and productions of the beel in order to ensure food security. Subjects and Methods: Primary data was developed by a semi-structured questionnaires and primary data was collected by field observation which comprised of selected area of the beel basin, survey of different fishing methods, conducted a series of Focus Group Discussions (FGDs), applying Local Ecological Knowledge (LEK) and Key Informant Interview (KII). Secondary data were collected from the Department of Fisheries (DoF), comprehensive literature review and internet sites. The code of IUCN was followed to categorize the status of the beel and to compare the trend among different years Shannon index was followed. Results: A total number of 91 species (83 wild fishes, four prawns, one crab, one snail, and four species of turtles) belonging to 65 genera were identified from the Charia beel. About 10 types of operative fishing gear and craft were found in the river. The increasing rate of using current jal (20.50-30.50%) and Kapuri jal (14.60-18.00%) were identified as detrimental gear used to kill the different species during four years. A common increasing trend of using current jaal, Kapuri jaal (seine net) and FAD (Fish aggregating device) were identified as detrimental gear killing different species between 2016 and 2019. The fish productivity decreased dramatically from 184.52± 55.04 to 141.65± 57.66 mt within four years and the total production percentage (%) also sharply decreased from 8.88% mt to 23.23% over the same period. Conclusion: Commercially important 06  aquatic species namely Sarpunti (Puntius sarana), Napit (Badis badis), Gajar (Channa marulius) and Turtles (Kachuga tecta,Morenia petersi and Lissemys punctata) were regional extinct, 18 commercially important aquatic species were at the edge of extinction (critically endangered, CR), 35 species endangered (EN),  23 species vulnerable status (VU), five species were identified as lower risk (LR) and only four species of the river were not threatened (NT) in position between 2016 and 2019 in the this beel.