TAINAN, Taiwan — A creative conservation effort in southern Taiwan is paying off for the island’s largest land-dwelling crab species, with observed populations more than doubling thanks to road closures and specially constructed bamboo bridges.
Taijiang National Park, located in the city of Tainan, serves as the most critical habitat for the mangrove land crab and holds the biggest population of the species anywhere on the island.
Every year between July and September, female crabs make their way down to the ocean to release their eggs. The problem is that their migration path crosses roadways, putting them at serious risk of being struck by vehicles.
To address this danger, park officials implemented road closures and erected bamboo bridges to give the crabs a safer path. The results have been remarkable. Taijiang National Park Director Chen Jun-shan said the measures have cut down on crab deaths on roadways and helped push the number of crabs spotted annually from more than 5,000 in previous years to over 10,000 last year.
Director Chen emphasized the broader environmental importance of the species. “As for the mangrove land crab, it can return all of these nutrient sources back into the land, allowing the coastal forest to become more abundant,” he said. “So if you protect the land crabs, the entire coastal forest belt can be protected.”
Taiwan’s environmental priorities have shifted significantly since the country’s rapid industrial growth period spanning the 1960s through the 1980s, when ecological concerns often took a back seat. Today, a system of protected areas and national parks draws visitors from across the region.
Taijiang National Park is also a refuge for the black-faced spoonbill, a bird classified as “vulnerable” by the International Union for Conservation of Nature and Natural Resources. That species has also made a significant recovery after once teetering on the edge of extinction.
