AUTHOR=Qi Xiaofei TITLE=Resource elements of the national blue economic system and their development mechanisms: a case study of China JOURNAL=Frontiers in Marine Science VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/marine-science/articles/10.3389/fmars.2025.1453126 DOI=10.3389/fmars.2025.1453126 ISSN=2296-7745