Do Now: What are the major differences between freshwater and saltwater bodies? Are there any similarities?

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Presentation transcript:

Do Now: What are the major differences between freshwater and saltwater bodies? Are there any similarities?

Aim: How are FW and SW layers classified?

Vertical Stratification in Freshwater Biomes FW layers delineated based on: Temperature Oxygen content Nutrient level Seasonal changes Disturbances Where will oxygen content and nutrient level be greatest?

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.

Chart & Pic: Stratification Layers

What is the difference between the two? And Why? SPRING SUMMER

Vertical Stratification Based on Organisms 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 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 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

Vertical Stratification in FW Biomes Littoral zone Limnetic zone Profundal zone Benthic zone

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.

FW Oceans zones

SW Oceans zones 1. Coastal zone area closest to land defined as shore to end of continental shelf

SW Oceans zones 2. Euphotic zone the photic, upper layers of water warmest region of ocean water highest level of dissolved oxygen.

SW Oceans zones 3. Bathyal Zone colder, middle region receives insufficient light for photosynthesis

SW Oceans zones 4. 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

Pic: SW Ocean Zones