Agriculture and fisheries production in a regional blending and dynamic fresh and saline water systems in the coastal area of Bangladesh

作者：Hasan Muhammad Abdullah, Syed Muhimeen Ahmed, Bhoktear Khan, N. T. Mohana, Tofayel Ahamed, Imranul Islam · 发表于：Environmental Challenges · 年份：2021 · DOI：10.1016/j.envc.2021.100089 · 被引用次数：23 · 研究领域：Coral and Marine Ecosystems Studies、Coastal wetland ecosystem dynamics、Marine and fisheries research

With the increase of salinity, shrimp monoculture is a typical production system on many global coasts. They are thus inviting commercially valuable exotic shrimp species that threaten the population of natives and causing alteration of ecosystem function. This intentional introduction and redistribution of shrimp species is an Anthropocene feature of the global coast. Therefore, we investigated how the coastal system breaches a freshwater system leading to more saline-friendly production. Spatiotemporal mapping showed the scope of diversified coastal livelihood that illustrate the coexistence of saline and sweet water-based production system in Bangladesh with a mean accuracy of 89% (kappa statistics 0.86). In many parts, the once agriculturally dominated landscape has transformed into aquaculture to produce shrimp, crab, fish, and salt. Continuous Change Detection and Classification (CCDC) algorithm also depicts the breakpoint in time series of normalized difference vegetation index (NDVI) data due to coastal land-use change. This dynamism includes the strong presence of mixed rice-shrimp culture in Assasuni (west coast) and Chakaria (east coast), as well as salt panning in Chakaria and paddy rice production in Kalapara (mid-coast). Thus those areas are more resilient because many other coastal communities primarily depend on shrimp or aqua monoculture, having limited or no alternative production system. Due to semi-intensive shrimp cultivation, biotic depletion, disease, p...