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Transcript of Aquatic Biomes
Aquatic BiomesA BIOME is a major ecosystem spread over a wide geographic area, and characterized by certain types of flora and fauna.
1Life originated in the oceans, and stayed there for nearly 3 billion years. The oceans are the most influential of all terrestrial features affecting climate and biomes.
Major Aquatic Biomes - These occupy most of the biosphere 2marine (average salinity 3%) freshwater (average salinity 1% or less) brackish (mixture of salt/fresh)
Aquatic biomes may be
3Lakes/pondsRiver systemsFreshwater biomes may be:
4EstuariesMarshes and wetlandsFreshwater or Brackish systems may be:
5intertidal regions coral reefs oceanic pelagic zonesabyssal zones
6Light is absorbed by water and by living aquatic organisms... photic zone - light sufficient for photosynthesis aphotic zone - light insufficient for photosynthesis
Stratification of Aquatic Biomes
7littoral zone - inshore, shallow, high light levels limnetic zone center of lake, high light levels, upper regions of water column (pelagic zone for the ocean!) profundal zone aphotic benthic zone bottom substrate; often rich in detritus
Zonation in freshwater biomes
8oligotrophic - deep, nutrient poor, water very clear eutrophic - shallower, nutrient rich, murky with phytoplanktonmesotrophic - in between the above two classifications
Classification of Freshwater Biomes by Productivity 9