https://opendata.uni-halle.de//handle/1981185920/118490 2026-04-08T09:36:44Z https://opendata.uni-halle.de//handle/1981185920/123769 Title: Fishers' responses to tropical cyclones in coastal Bangladesh Author(s): Islam, Mohammad Mahmudul; Hossain, Mohammad Mosarof; Mitu, Sabrina Jannat; Herbeck, Johannes; Mozumder, Mohammad Mojibul Hoque; Schneider, Petra; Zabir, Abdullah Al; Shamsuzzaman, Mostafa; Jentoft, Svein Abstract: Coastal communities in general have been studied in the context of disaster. However, the specific responses of fishing communities to tropical cyclone events remain relatively under-explored in the disaster science literature. This study investigates fishers' responses to tropical cyclones and various factors that impact behavioral decisions on whether to go to a cyclone shelter. The findings suggest that fishers' coping mechanisms involve securing daily necessities through their initiatives, reliance on kinship relations and obligations, diversification of livelihoods, intensification of fishing, and engagement in social networking and environmental management. The findings suggest that approximately half of the participants refrained from seeking refuge in cyclone centres for various reasons. Crucially, the socio-economic and occupational status of fishing communities significantly influenced their reluctance to comply with evacuation orders. Recognizing non-compliance with evacuation orders is a leading factor in cyclone-related human fatalities and addressing and mitigating non-compliance is essential. Integrated and comprehensive approaches, including cross-sector cooperation, will be needed for effective disaster risk management strategies within small-scale fishing communities. 2025-04-17T00:00:00Z https://opendata.uni-halle.de//handle/1981185920/122286 Title: Reproductive Ecology of the Freshwater Snail, Pila globosa, Considering Environmental Factors in a Tropical Freshwater Swamp Forest Author(s): Schneider, Petra; Das, Suhel; Hossain, Mohammad Amzad; Chowdhury, Gourab; Hussain, Monayem; Pandit, Debasish; Kunda, Mrityunjoy; Mahbub, Mohammed Abstract: The apple snail Pila globosa is a widely distributed mollusc in tropical freshwater ecosystems, where it plays a crucial ecological role. This study examined the morphometric features, condition indices, and reproductive traits of P. globosa to gain insights into its population structure in the Ratargul Freshwater Swamp Forest, Bangladesh. Water quality parameters were recorded, and various morphometric measurements were analysed, including their correlations and seasonal variations. The mean values for shell length, shell weight, shell width, spiral length, base length, aperture length, aperture width, and soft tissue wet weight were 4.64 ± 0.97 cm, 38.29 ± 15.27 g, 3.56 ± 0.74 cm, 2.32 ± 0.51 cm, 3.33 ± 0.74 cm, 3.46 ± 0.64 cm, 2.01 ± 0.45 cm, and 18.05 ± 11.39 g, respectively. Linear regression analyses revealed strong correlations among length–length and length–weight parameters, indicating consistent growth patterns. Monthly frequency distributions showed distinct variations in shell size and form. The sex ratio was 1:1.23 (male–female), not significantly different from parity. Histological analysis during the rainy season revealed reproductive activity, including mature ova, previtellogenic and vitellogenic oocytes, and spermatogonia and spermatids. These findings enhance understanding of the species’ biology and its interaction with environmental conditions, offering valuable data for the conservation and management of freshwater mollusc populations in wetland ecosystems. 2025-08-18T00:00:00Z https://opendata.uni-halle.de//handle/1981185920/121458 Title: Comparative analysis of asphalt and geomembrane sealing systems for sustainable uranium pile remediation : Insights from hydrological modeling under climate change Author(s): Schneider, Petra; Li, Fengqing; Babu, Subin Abstract: Uranium ore mining heaps in Saxony and Thuringia (Germany) have been primarily covered with mineral layers as part of remediation efforts. However, aging processes in these covers—driven by climatic factors, vegetation, and root penetration—can create cracks and pathways that increase radon emissions. In residential areas, elevated radon levels may exceed the guideline values set by radiation protection regulations. While asphalt seals and geomembranes are well-established as effective long-term solutions for creating convection-tight surface systems in landfill applications, their use has rarely been considered for uranium legacy sites. This study evaluates the long-term water balance and sealing effectiveness of asphalt and geomembranes at historical uranium mining site under future climate scenarios. Using the Hydrologic Evaluation of Landfill Performance (HELP) model, we simulated water behavior and potential infiltration rates across several sealing configurations, considering current and future climate projections. Our findings reveal that both sealing systems effectively minimize infiltration, surface runoff, and seepage, with negligible infiltration even under worst-case scenarios. The results underscore the robust environmental protection offered by these systems in mitigating radon emission and ensuring long-term environmental safety. This study contributes critical insights for selecting appropriate sealing systems in mining site remediation, offering sustainable solutions that address water conservation, climate resilience, and cleaner production principles. 2025-07-11T00:00:00Z https://opendata.uni-halle.de//handle/1981185920/121224 Title: Stock Assessment of Long Whisker Catfish (Mystus gulio) : Ensuring the Fisheries’ Sustainability in the Sundarbans Mangrove, Bangladesh Author(s): Schneider, Petra; Rahman Ovi, Tanvir; Tanni Sarkar, Tanni; Gope, Dwipika; Ahmod, Rayhan; Kumar Barman, Sanzib; Shamsuzzaman, Mostafa; Mojibul Hoque Mozumder, Mohammad; Protim Barman, Partho Abstract: The world’s largest mangrove, Sundarbans, Bangladesh, is the habitat of the euryhaline catfish Nona Tengra (Mystus gulio). This study aimed to assess the stock status of M. gulio and provide reference points for sustainable fisheries’ management. One-year length–frequency (LF) data were collected from the Sundarbans region of Bangladesh and analyzed using the Length-Based Bayesian Biomass (LBB) method and the Length-Based Spawning Potential Ratio (LBSPR) model. The findings showed healthy biomass (B/BMSY = 1.2), with 57% of the wild stock of this species being harvested (B/B0 = 0.43). The calculated fishing mortality ratio indicated the underfishing conditions (F/M = 0.9). Safe exploitation (E = 0.46) was depicted, as E was smaller than the permitted level of 0.5. The value of capture length (Lc = 12.8 cm) was larger than the optimum capture length (Lc_opt = 10.0 cm) and the optimum length for maximum yield per recruit (Lopt = 12.0 cm) and larger than the maturity length (Lm = 9.16 cm), indicating the capture of mature individuals. The calculated Spawning Potential Ratio (SPR = 48%) was higher than the target reference points (SPR = 40%). This research evaluated the sustainable stock status. Although the margin between Lc_opt and Lm is very narrow, setting the minimum capture size at Lopt would be a conservative buffer to ensure long-term sustainability. The recommended minimum harvest size is 12 cm for M. gulio. Current fishing gear selectivity can ensure the sustainability of M. gulio in Sundarbans, Bangladesh; however, maintaining current fishing practice through careful management is suggested. Further assessments with length-based and other low-data methods should be conducted to refine exploitation estimates and trends. 2025-06-20T00:00:00Z