AimTidal marsh ecosystems are heavily impacted by human activities, highlighting a pressing need to address gaps in our knowledge of their distribution. To better understand the global distribution and changes in tidal marsh extent, and identify opportunities for their conservation and restoration, it is critical to develop a spatial knowledge base of their global occurrence. Here, we develop a globally consistent tidal marsh distribution map for the year 2020 at 10‐m resolution.LocationGlobal.Time period2020.Major taxa studiedTidal marshes.MethodsTo map the location of the world's tidal marshes at 10‐m resolution, we applied a random forest classification model to Earth observation data from the year 2020. We trained the classification model with a reference dataset developed to support distribution mapping of coastal ecosystems, and predicted the spatial distribution of tidal marshes between 60° N and 60° S. We validated the tidal marsh map using standard accuracy assessment methods, with our final map having an overall accuracy score of 0.85.ResultsWe estimate the global extent of tidal marshes in 2020 to be 52,880 km2 (95% CI: 32,030 to 59,780 km2) distributed across 120 countries and territories. Tidal marsh distribution is centred in temperate and Arctic regions, with nearly half of the global extent of tidal marshes occurring in the temperate Northern Atlantic (45%) region. At the national scale, over a third of the global extent (18,510 km2; CI: 11,200–20,900) occurs within the USA.Main conclusionsOur analysis provides the most detailed spatial data on global tidal marsh distribution to date and shows that tidal marshes occur in more countries and across a greater proportion of the world's coastline than previous mapping studies. Our map fills a major knowledge gap regarding the distribution of the world's coastal ecosystems and provides the baseline needed for measuring changes in tidal marsh extent and estimating their value in terms of ecosystem services.

中文翻译：

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从地球观测数据看全球潮汐沼泽的分布


AimTidal 沼泽生态系统受到人类活动的严重影响，这凸显了我们迫切需要解决其分布知识的空白。为了更好地了解潮汐沼泽范围的全球分布和变化，并确定其保护和恢复的机会，开发潮汐沼泽全球分布的空间知识库至关重要。在这里，我们以 10 米分辨率绘制了 2020 年全球一致的潮汐沼泽分布图。位置全球。时间段 2020。研究潮汐沼泽的主要分类单元。方法为了以 10 米分辨率绘制世界潮汐沼泽的位置，我们应用了随机我们将森林分类模型与 2020 年的地球观测数据相结合。我们使用为支持沿海生态系统分布测绘而开发的参考数据集来训练分类模型，并预测了北纬 60° 至南纬 60° 之间潮汐沼泽的空间分布。我们验证了使用标准精度评估方法绘制的潮汐沼泽地图，最终地图的总体精度得分为 0.85。结果我们估计 2020 年全球潮汐沼泽的范围为 52,880 平方公里（95% CI：32,030 至 59,780 平方公里），分布在 120 个国家和地区领土。潮汐沼泽分布集中在温带和北极地区，全球近一半的潮汐沼泽分布在北大西洋温带地区（45%）。在国家范围内，超过三分之一的全球范围（18,510平方公里；CI：11,200–20,900）发生在美国境内。主要结论我们的分析提供了迄今为止关于全球潮汐沼泽分布的最详细的空间数据，并表明潮汐沼泽发生在与之前的测绘研究相比，该研究涵盖了更多国家和更大比例的世界海岸线。 我们的地图填补了有关世界沿海生态系统分布的主要知识空白，并提供了测量潮汐沼泽范围变化和估计其生态系统服务价值所需的基线。