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In the plain of the Baix Ter they appear different types from atmospheres related to the water, that are from the dynamic balance between earth, sea and fresh water. The interaction between the sea, the river and the sediments that this transports has formed a very diverse mosaic of ecosystems, with very subtle variations in the duration of the flood, the depth, the salinity, the content of nutrients or the type of substrate. Next the main aquatic ecosystems are described that are in the Baix Ter. The variety of atmospheres and the diversity of organisms that lodge are one of the main ecological values of these humid zones.
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