Jou also mentions that in general, coral islands have fewer problems with plant pests and diseases due to their sparse resources, but Tuvalu, which has a foundation of coral rocks, has another serious problem — crab attacks. Crabs are nocturnal creatures, hiding in holes during the day and coming out at night. They love eating seedlings and fresh leaves, and it ’ s impossible to guard against them.
周俊賢還提到，一般珊瑚島由於資源微弱，病蟲害較少，但由珊瑚石構成的吐瓦魯卻有嚴重「蟹害」──躲在洞裡的螃蟹晝伏夜出，嗜吃幼苗、葉片，防不勝防。