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Japan has significant diversity in flora. Of approximately 5,600 total vascular plant species, almost 40% are endemic. [1] This richness is due to the significant variation in latitude and altitude across the country, a diversity of climatic conditions due to monsoons, and multiple geohistorical incidences of connections with the mainland.
Japan lies at the convergence of three terrestrial realms, the Palearctic, Indomalaya, and Oceania, and its flora and fauna combine elements from all three.The ecoregions that cover the main islands of Japan, Honshū, Hokkaidō, Kyūshū, and Shikoku, along with the nearby islands, are considered part of the Palearctic realm.
Japan is within the larger region of East Asia. For the purposes of this category, "Japan" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions . That is, the geographic region is defined as including the following areas, typically defined by the political boundaries of its constituents:
17% of the ecoregion is in protected areas. [1] Protected areas include Fuji-Hakone-Izu National Park, Ise-Shima National Park, Yoshino-Kumano National Park, Seto Inland Sea National Park, Ashizuri-Uwakai National Park, Kirishima-Kinkowan National Park, Unzen-Amakusa National Park, Saikai National Park, and Suigō-Tsukuba Quasi-National Park (349.56 km 2 (134.97 sq mi)).
Japan ranks fourth with its exclusive economic zone ocean water volume from 0 to 2,000 m (6,600 ft) depth. Japan ranks fifth with a sea volume of 2,000–3,000 meters, fourth with 3,000–4,000 meters, third with 4,000–5,000 meters, and first with a volume of 5,000 to over 6,000 meters.
The Japanese taimen (Hucho perryi) is the largest fish to enter freshwater in Japan and may reach sizes of up to 2 meters in length. The Japanese taimen is a critically endangered species including the Japanese populations which are restricted to the rivers and surrounding ocean of Hokkaido. Also present is the Japanese dace (Tribolodon ...
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The climate is cooler in the north of Honshu than the south, with deciduous mixed trees typified by Japanese beech (Fagus crenata), Jolcham oak (Quercus serrata), Castanopsis sieboldii, Picea jezoensis, Pinus thunbergii, Pinus pumila, Prunus nipponica, Cryptomeria japonica, Sciadopitys verticillata, Salix pierotii, Camphora officinarum, Cercidiphyllum japonicum, Fagus crenata, Carpinus ...