do now: what are the major differences between freshwater and saltwater bodies? are there any...
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Aim: How are FW and SW layers classified?TRANSCRIPT
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Do Now:• What are the major differences between
freshwater and saltwater bodies? Are there any similarities?
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Aim: How are FW and SW layers classified?
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Vertical Stratification in Freshwater Biomes
FW layers delineated based on:• Temperature• Oxygen content• Nutrient level• Seasonal changes• DisturbancesWhere will oxygen content and nutrient level
be greatest?
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Vertical Stratification Based on Temperature
• Epilimnion is less dense, warmer, the uppermost, and thus most oxygenated.
• Thermocline is line between the two layers, temperature shifts dramatically.
• Hypolimnion is the lower, colder, and denser layer.
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Chart & Pic: Stratification Layers
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What is the difference between the two? And Why?
SPRING SUMMER
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1. Littoral zone: very shallow; at shoreline – Ample sunlight for plants & animals– End of this zone is defined as the depth at
which rooted plants stop growing
Vertical Stratification Based on Organisms
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2. Limnetic zone: surface of open water to the deepest area which sunlight can reach.– Organisms that are residents here are
short-lived and rely on sunlight to carry out photosynthesis
Vertical Stratification Based on Organisms
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Vertical Stratification Based on Organisms
3. Profundal zone: Water is too deep for sunlight to penetrate. (Aphotic) – Photosynthesizing plants
& animals can’t exist here
4. Benthic zone: The deepest layer in a body of water– Low temps– Low oxygen
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Vertical Stratification in FW Biomes
• Littoral zone• Limnetic zone• Profundal zone• Benthic zone
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Pause…Write
• We just learned about the stratification of layers in a freshwater system. Will the layers be the same for a salt water system? Explain your answer in complete sentences.
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FW Oceans zones
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1. Coastal zone– area closest to land– defined as shore to end of continental shelf
SW Oceans zones
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SW Oceans zones2. Euphotic zone
– the photic, upper layers of water – warmest region of ocean water– highest level of dissolved oxygen.
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SW Oceans zones3. Bathyal Zone
• colder, middle region • receives insufficient light for photosynthesis
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SW Oceans zones4. Abyssal zone
– Deepest region– Extreme cold temps.– Low levels of dissolved oxygen– High levels of nutrients sinking to bottom
from zones above• Ex: detritus, decomposed plant and animal material
– High pressure
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Pic: SW Ocean Zones