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Topic modeling discovers trending topics in global research on the ecosystem impacts of microplastics
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Researchers applied computational topic modeling to analyze how global microplastic research on ecosystem impacts has evolved across topics, regions, and time periods. The analysis identified trending research themes including terrestrial microplastics and biological interactions while revealing that marine-focused topics remain dominant, helping map the next frontiers for microplastic ecology research.
The ecological threats of microplastics (MPs) have sparked research worldwide. However, changes in the topics of MP research over time and space have not been evaluated quantitatively, making it difficult to identify the next frontiers. Here, we apply topic modeling to assess global spatiotemporal dynamics of MP research. We identified nine leading topics in current MP research. Over time, MP research topics have switched from aquatic to terrestrial ecosystems, from distribution to fate, from ingestion to toxicology, and from physiological toxicity to cytotoxicity and genotoxicity. In most of the nine leading topics, a disproportionate amount of independent and collaborative research activity was conducted in and between a few developed countries which is detrimental to understanding the environmental fates of MPs in a global context. This review recognizes the urgent need for more attention to emerging topics in MP research, particularly in regions that are heavily impacted but currently overlooked.
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Topic modeling discovers trending topics in global research on the ecosystem impacts of microplastics
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A topic-modeling analysis of global microplastic research literature identified nine dominant research themes and tracked how the field has shifted over time — from aquatic to terrestrial environments, from distribution mapping to fate/transport, and from gross physiological toxicity to cellular and genetic damage. The analysis also found that research is heavily concentrated in a handful of wealthy nations, leaving major gaps in understanding microplastic impacts in the most heavily polluted but under-studied regions of the world.
Making waves: Topic modeling discovers trending topics in global research on the ecosystem impacts of microplastics
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