Aquatic Biomes - benthic and pelagic . Benthic communities...

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Aquatic Biomes Conditions in water are generally less harsh than those on land. Aquatic organisms are buoyed by water support, and do not usually have to deal with desiccation. Despite covering 71% of the Earth's surface, areas of the open ocean are a vast aquatic desert containing few nutrients and very little life, as shown by Figure 13. . Clearcut biome distinctions in water, like those on land, are difficult to make. Dissolved nutrients controls many local aquatic distributions. Aquatic communities are classified into: freshwater (inland) communities and marine (saltwater or oceanic) communities. The Marine Biome The marine biome contains more dissolved minerals than the freshwater biome . Over 70% of the Earth's surface is covered in water, by far the vast majority of that being saltwater. There are two basic categories to this biome:
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Unformatted text preview: benthic and pelagic . Benthic communities (bottom dwellers) are subdivided by depth: the shore/shelf and deep sea. Pelagic communities (swimmers or floaters suspended in the water column) include planktonic (floating) and nektonic (swimming) organisms. The upper 200 meters of the water column is the euphotic zone to which light can penetrate. Coastal Communities Estuaries are bays where rivers empty into the sea. Erosion brings down nutrients and tides wash in salt water; forms nutrient trap. Estuaries have high production for organisms that can tolerate changing salinity. Such organisms are shown in Figure 14. Estuaries are called "nurseries of the sea" because many young marine fish develop in this protected environment before moving as adults into the wide open seas....
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Aquatic Biomes - benthic and pelagic . Benthic communities...

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