Local Efforts Help Crab Species Grow at Tainan National Park
In Taijiang National Park on the outskirts of Tainan, locals have grown a soft spot for the Taiwan mangrove land crab, a species whose population had been dwindling over the years due to increased traffic along a seaside road cutting across their migration path as they scuttled to the sea to lay their eggs. The local residents' solution? Donning headlamps, building bridges from bamboo and cordoning off certain roads during the crab's breeding season. Their conservation work has had a huge impact, with sightings of the crabs doubling over just a handful of years.
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**Bamboo Bridges Help Crabs Spawn**
Residents near a national park are aiding the migration of Taiwan’s mangrove land crabs by constructing bamboo bridges and controlling road traffic. The crabs must cross roads and embankments to reach the sea and release their eggs during the spawning season from July to September.
“With traffic control in place, the mother crabs can make it [to the shore] and release their eggs.” Without intervention, many crabs were lost to roadkill, local volunteer and mechanic says Wu Ruei-chang says.
Volunteers Chen Kuo-chung and others built bamboo bridges over concrete tidal channels, providing safe crossing paths. “Diving is not okay for a female [crab]. Not one of them with a big belly wades through the water,” Chen said.
Community engagement extends to data tracking and education, with local student Wang Ming-chieh adding, “We can help check whether there are any cars... because if these [cars] pass by, they might run over them.”
These efforts have doubled the crab population to over 10,000, benefiting both the species and the coastal ecosystem. Taijiang National Park Director Chen Jun-Shan says, “If you protect [them], the entire coastal forest belt can be protected,” highlighting the crabs’ crucial ecological role.
