Pollution, coastal development, climate change and many other human impacts have degraded or destroyed swathes of mangrove forests, saltmarshes, seagrass meadows, macroalgae (seaweed) forests and coral and shellfish reefs. We've lost a staggering 85% of shellfish reefs around the world and coral is bleaching globally. When healthy, these coastal habitats help feed the world by supporting fisheries. They are home to more than 100 species of charismatic marine megafauna, ranging from sharks to dugongs. They sequester carbon, thus helping to slow climate change. The list goes on. Healthy coastal habitats are the gift that keeps on giving. We need them back, so there's a lot of enthusiasm for restoring these habitats. For example, we can plant mangroves, build new shellfish reefs and reduce pollution to help seagrass grow back. But we want to recover more than just the habitats. We want the animals they support too. We need to know if restoration is helping animals. We analyzed restoration projects around the world to assess how animals are benefitting. Compared to degraded sites, restored habitats have much larger and more diverse animal populations. Overall, animal numbers and the types of animals in restored habitats are similar to those in natural habitats. So restoration works. But outcomes for animals vary from project to project. Not all projects deliver the goods. As a result, resources are wasted and humanity misses out on the huge benefits of healthy coastal habitats. We collated over 5,000 data points from 160 studies of coastal restoration projects around the world. Excitingly, animal populations and communities were remarkably similar to those in comparable undisturbed natural sites. For example, restoring seagrass off Adelaide's coast brought back invertebrates, which are food for many fish species Australians love to catch, such as Australasian snapper. Invertebrate numbers here were comparable to nearby... |