aquatic biomes
DESCRIPTION
Aquatic Biomes. A BIOME is a major ecosystem spread over a wide geographic area, and characterized by certain types of flora and fauna. . Major Aquatic Biomes - These occupy most of the biosphere. - PowerPoint PPT PresentationTRANSCRIPT
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Aquatic BiomesA BIOME is a major ecosystem spread over a wide geographic area, and characterized by
certain types of flora and fauna.
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Life 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
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marine (average salinity 3%) freshwater (average salinity 1% or less) brackish (mixture of salt/fresh)
Aquatic biomes may be
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Lakes/ponds River systems
Freshwater biomes may be:
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Estuaries Marshes and wetlands
Freshwater or Brackish systems may be:
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intertidal regions coral reefs oceanic pelagic zones abyssal zones
Marine
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Light 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
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littoral 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
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oligotrophic - deep, nutrient poor, water very clear
eutrophic - shallower, nutrient rich, murky with phytoplankton
mesotrophic - in between the above two classifications
Classification of Freshwater Biomes by Productivity