Coastal urbanization causes environmental modifications that directly and indirectly influence the distribution and functioning of coral reefs. However, the capacity of urban infrastructure to support corals and vertically accrete is less understood. Here, we investigated if coral communities on reefs and seawalls in Singapore are distinct, and examined the environmental variables influencing coral carbonate production. Surveys at 22 sites yielded 134 coral species, with richness significantly higher on reefs. Coral cover and Shannon index did not differ between habitat types. Community composition was distinct between habitat types, with seawalls supporting a higher proportion of massive and thick-plating species. ‘Distance from mainland’ was the single most important variable influencing normalized carbonate production rates (a function of species-specific linear extension rate and skeletal bulk density and site coral cover), which were higher further from the mainland where human activity and development pressures were greater. Our results indicate that environmental filtering strongly shapes coral communities and may influence ecosystem functioning in Singapore’s urbanized reef system. The findings will guide the management of reefs on increasingly urbanized coastlines.

沿海城市化导致环境变化，直接或间接影响珊瑚礁的分布和功能。但是，人们对城市基础设施支撑珊瑚和垂直增生的能力的了解却很少。在这里，我们调查了新加坡礁石和海堤上的珊瑚群落是否明显，并研究了影响碳酸钙生产的环境变量。在22个地点进行的调查产生了134种珊瑚，珊瑚礁的丰富度明显更高。不同生境类型的珊瑚覆盖率和香农指数没有差异。栖息地类型之间的群落组成是不同的，海堤支持着更大比例的块状和厚板物种。“离大陆的距离”是影响归一化碳酸盐生产速度（取决于物种的线性扩展速度，骨骼体积密度和珊瑚覆盖率的函数）的最重要的变量，其远高于人类活动和发展压力最大的内地。更大。我们的结果表明，环境过滤强烈影响着珊瑚群落，并可能影响新加坡城市化珊瑚礁系统中的生态系统功能。这些发现将指导日益城市化的海岸线上的珊瑚礁管理。我们的结果表明，环境过滤强烈影响着珊瑚群落，并可能影响新加坡城市化珊瑚礁系统中的生态系统功能。这些发现将指导日益城市化的海岸线上的珊瑚礁管理。我们的结果表明，环境过滤强烈影响着珊瑚群落，并可能影响新加坡城市化珊瑚礁系统中的生态系统功能。这些发现将指导日益城市化的海岸线上的珊瑚礁管理。