Blue planet biomes taiga8/4/2023 For example, the Brazilian Pantanal biome (aquatic) only gradually gives way to the drier, denser vegetation of the Amazon rainforest biome (terrestrial). ![]() There is no set number of biomes, and there are no fixed boundaries between biomes. ![]() A biome covers a wider physical area than an ecosystem or habitat: a biome may consist of hundreds of ecosystems, and a great many habitats. It’s the only unit that is small enough to be distinct, but large enough to matter. (3) The biome is the basic unit of the ecological system. What’s The Difference Between a Biome and an Ecosystem?īiomes are ecological zones with distinct collections of plants and animals, that have formed because they share the same climate - the same temperature, amount of rainfall and humidity.Next in size after biogeographical realms, are “bioregions”, followed by “ecoregions” which are often interchangeable with “biomes”. Oceania (1m sq km) - Polynesia, Micronesia, the Fijian Islands.Indomalaya (7.5m sq km) - Indian subcontinent, Southeast Asia, southern China.Australasia (7m sq km) - Australia, New Guinea, New Zealand, and neighbouring islands.Neotropic (19m sq km) - most of South America, Central America, and the Caribbean.Afrotropic (22m sq km) - Trans-Saharan Africa and Arabia.Nearctic (22.9m sq km) - most of North America.Palearctic (54m sq km) - most of Eurasia and North Africa.Image: © Carol (CC BY-SA 3.0) The 8 Biogeographical Realms Not shown are the Antarctic Realm and the Oceania Realm (contains no continental land mass but includes Polynesia, Micronesia, and the Fijian Islands). Green = Nearctic red = Palearctic purple = Neotropic blue = Afrotropic brown = Indomalaya orange = Australasia. Map showing 6 of the 8 Main Biogeographical Realms (Ecozones).
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