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Wildlife of Hahajima Island

Specific insects

Ogasawara insects have evolved independently for each archipelago and island, and over 1,300 species have been confirmed so far. New species are still being discovered today. However, due to the foreign lizards, The Green Anole, ingesting insects, unique insects have been significantly reduced in number on Chichijima Island and Hahajima Island. Meanwhile, efforts are under way to protect Celastrina ogasawaraensis (Hahajima Island), Cylindera bonina (Anijima Island), dragonflies (Ototojima Island, Anijima Island, Hahajima archipelago)。Meimuna opalifera tells us the fall of Ogasawara with its cry.

Hemicordulia ogasawarensis

Reptiles

There are no conventional amphibians in Ogasawara only the reptiles Cryptoblepharus Boutoni and Gunther's Tropical Gecko (Minamitorishima Island) inhabit. Cryptoblepharus boutoni has a shiny brown body surface and can be seen on the side of farm roads and the forest road during the day, and on the trees. On Chichijima Island and Hahajima Island, we can see more foreign species of Green Anole. Its predatory pressure is so large as to destroy entire insect phases and there is also concern about competition of the habitat of the Ogasawara Lizard. In recent years, the Green Anole has been confirmed on Anijima Island, and countermeasures are progressing.

The green anole

Ferns

On ocean islands like Ogasawara, there are not any chinquapin or oak trees whose seeds spread by rolling on the ground, but the percentage of ferns whose spores spread with the wind is greater than on the continents or continental islands. Many tree ferns are observed in and around the wet forest and along mountain streams on Chichijima and Hahajima Islands, which partly characterizes the forests of Ogasawara. Cyathea mertensiana, an endemic species among tree ferns, is characterized by marks of fallen leaves on the surface of a stem that look like upside-down Japanese character “八” (eight).

Maruhachi

Subtropical Rainforest in Hahajima Island

Hahajima Island and Chichijima Island have subtropical rainforests with trees at a height of 20 m, suitable for the high humidity (Elaeocarpus sylvestris, bird-lime tree, Ardisia sieboldii, Planchonella obovata, Ogasawara mulberry, etc.). Particularly in the high mountains on Hahajima Island, humid winds from the sea blow up the mountain and form a cloud belt forest on the steep windswept slopes of the island, where the cloud belt forest is formed mainly with Dendrocacalia, an Asteraceae woody plant. However, exotic plants like bishop wood are rapidly expanding their distribution, and indigenous plants are replaced by the invasive species.

Wet forests on Hahajima Island

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