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Deltas have a remarkable capacity to sustain human populations, owing to their productivity and biodiversity. The increasing demand for fertile land and valuable resources in deltas has driven dramatic anthropogenic changes in deltas around the world, resulting in their ecological degradation. To make informed decisions regarding management of land in deltas, it is essential to expand the current understanding of the underlying causes and consequences of delta changes. This knowledge is critical for developing effective spatial solutions to deltas. In this study, we conducted a systematic review of existing literature on delta changes over time and across diverse regions. Utilizing the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) conceptual framework, we sought to identify the driving factors and consequences associated with these changes to gain a deeper understanding. In doing so, we explored (1) differences in study focus among regions, and (2) the causes and effects of delta changes. After reviewing 384 articles, we found that delta-change studies have become increasingly popular over the past two decades, particularly in Northeast Asia, North America, and South Asia. However, Africa, Europe, Southeast Asia, and Oceania, which account for almost 50 % of large deltas worldwide, have had few studies. The most mentioned indirect drivers are demography , economy , and governance, which are strongly linked to land use/cover change and waterway modification . These drivers are also strongly linked to many land changes, particularly forest and wetland loss , in deltas worldwide. We suggest that future research should focus on areas and deltas that are currently underrepresented, especially those in biodiversity hotspots and areas where the population depends heavily on delta ecosystems and associated nature's contributions to people (NCPs). • Studies on delta change have been increasing over time and with a global orientation. • Since 2018, Northeast Asian deltas have become increasingly popular, with a +400 % increase compared with 2017. • Demography , economy , and governance were the top three IDs mentioned and heavily linked to land use/cover and waterway modification (DD). • Non-material NCP, such as learning , experiences , and supporting identities , have been mostly understudied. • Only 29% of eligible articles evaluated NCP to measure the impact of delta changes on NCP.
Nantavisai et al. (Wed,) studied this question.