Aquatic Biomes

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Aquatic Biomes 2 Types 1. Freshwater 2. Salt
water (Marine) Determined by the concentration
of dissolved salts. Worlds
largest biomes
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Advantages to living in an aquatic biome
Buoyance provides physical support Less
temperature fluctuations Readily available
nutrients
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Most aquatic biomes have 3 layers
Surface Middle Bottom Factors
affecting life in these areas Temperature
Sunlight Dissolved Oxygen Nutrient
availability
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Freshwater Biomes Have less than 1 dissolved
salts by volume 90 of earths fresh water
frozen in glaciers 2 major types Lentic
(standing water) lakes, ponds, inland
wetlands Lotic (flowing water) rivers,
streams, creeks
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Lentic
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Lotic
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Lakes Large standing bodies that are formed
when precipitation, runoff, or ground seepage
fills large depressions in the earths surface
Fed by rain, melting snow, streams 3 types
based on nutrient content Oligotrophic
deep nutrient poor Eutrophic shallow
nutrient rich Mesotrophic in between
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The process by which lakes obtain
nutrients Eutrophication This process
can be unintentionally sped up by agriculture,
industry, urbanization Cultural
Eutrophication
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Lakes are divided into depth layers
Littoral shallow area near shorelines sun
completely penetrates Limnetic top water
area in mid-lake sun completely
penetrates Profundal mid to bottom of
lake very little to no sunlight
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Lake zonation
LITTORAL
LITTORAL
LIMNETIC
PROFUNDAL
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Rivers Streams Flowing freshwater systems
Comprised of 3 zones 1. Source zone
Source of river (mountain runoff, springs,
lakes) Usually turbulent High O2
content
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2. Transition zone Headwaters merge to
form deeper streams. Less
Turbulent Warmer water more producers 3.
Flood plain zone Slow moving, deep,
muddy Empty into ocean