QOD: What defines a Biome? Biomes Each Biome is defined by a unique set of abiotic factors- particularly climate- and a diverse group of plants and animals. Biome- large group of ecosystems that shares the same type of climax community. Biomes located on land are called terrestrial biomes. Biomes located in bodies of water are known as aquatic biomes. Aquatic Biomes Water makes up the largest part of the biosphere, covering approximately 75% of the Earth’s surface. The aquatic biome can be broken down into two basic regions: freshwater and marine. Freshwater- has low salt concentration- usually less than 1% Ex. Ponds, lakes, rivers, wetlands, streams Marine- cover about ¾ of the Earth’s surface Ex. Oceans, coral reefs, and estuaries Terrestrial Biomes Terrestrial biomes vary greatly. Climate is a group of abiotic factors that influence the type of climax community that develops in the area. There are many different terrestrial biomes that result from climate differences. Ex. Tundras, taigas, deserts, savannahs, temperate forests, and tropical rain forests