An assessment of geo-morphology and hydro-biological factors of major wetlands of Bangladesh

Abstract

The present study investigates the geo-morphological features, hydro-biological profiles and resource characteristics of some selected wetlands in Brahmanbaria district, Bangladesh. Two categories of wetland have been classified on the basis of area such as the small category (40-100 ha), which belongs to 11 wetlands and the large category (100-200 ha) to nine wetlands. The mean depth of all the surveyed wetland does not exceed 3.29 ± 0.83 m. The mean value of organic matter was measured as 7.5 ± 6.34%. The maximum organic matter was recorded at Gagotia beel (24.60%) and the minimum organic matter was recorded at Kajolia beel (2.06%). The mean value of organic carbon was measured as 3.93 ± 3.33%. The highest amount of organic carbon was found at Gagotia beel (12.95%) while the lowest amount of organic carbon was observed at kajolia beel (1.08%). Soil texture indicates the percentage composition of sand, silt and clay in sediment. The average concentration of sand, silt and clay was recorded to be 53.31 ± 15.32, 17.61 ± 9.56 and 29.08 ± 12.87%, respectively. Among the 20 selected wetlands examined, 13 were found to be perennial wetlands where water is available throughout the year. There was significant difference among different wetlands in terms of organic carbon, organic matter, sand, silt and clay (P < 0.05) as analyzed by One Way Analysis of Variance (SPSS v.22). The sampling stations were presented as a map created by GIS (ArcMap v.10.1). This qualitative and quantitative assessment will not only provide new information about the geo-morphological and hydro-biological insights into the wetland but also will facilitate the development, management, and conservation of aquatic biodiversity in a significant and worthwhile manner.

New Records of Two Non-native Clam Species (Bivalvia: Cardiidae) from the Coastal Waters of Bangladesh

“…Therefore, further studies are required to make a complete precision on the species and speciation processes of the bivalves around the To sum up, studies and survey on taxonomy and systematic on marine bivalves will provide new dimensions for further research about mollusks. Moreover, the study provides a new issue for further studies leading to uses, maintenance, management as well as protection/conservation of our mollusks and their habitats in Bangladesh [22].…”

Thyroid hormone‐induced swim bladder and eye maturation are transduced by IGF‐1 in zebrafish embryos

“…Assessments of embryos and larvae were completed daily, and larval mortality was quantified and recorded. The statistical significance of apparent differences was analysed by ANOVA and unpaired comparisons between means as per Molla et al (). Significance was determined at the p < .05 level.…”

Hydrological impacts of climate change on rice cultivated riparian wetlands in the Upper Meghna River Basin (Bangladesh and India)

“…Wetlands across the world are being progressively exploited for a range of developmental purposes (Ramsar Convention on Wetlands, 2018). Asian wetlands are, for example, under immense pressure from agricultural conversion in order to satisfy the food demands of the region's growing population (McCartney et al 2010, Gopal 2013, Junk et al 2013, Molla et al 2018, Quan et al 2018. A case study of Tanguar haor, a Bangladeshi wetland listed as a Ramsar site of international importance, demonstrated rapid population growth in the region (240% over a decade) and a 112% increase in rice production (Sun et al 2017).…”