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Nutrients, Blooms,  & Dead Zones: Abiotic Factors Nutrients, Blooms,  & Dead Zones: Abiotic Factors

Nutrients, Blooms, & Dead Zones: Abiotic Factors - PowerPoint Presentation

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Uploaded On 2018-11-17

Nutrients, Blooms, & Dead Zones: Abiotic Factors - PPT Presentation

Page 73 Abiotic Factors in Ocean Ecosystems Depth pressure light availability oxygen availability Salinity Temperature Nutrient availability Depth and Pressure At sea level there is 1 atmosphere ID: 730288

light ocean pressure availability ocean light availability pressure nutrients depth atm salinity photosynthesis penetrates salt zones algae eutrophication plants

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Slide1

Nutrients, Blooms, & Dead Zones: Abiotic Factors

Page 73Slide2

Abiotic Factors in Ocean Ecosystems

Depth (pressure, light availability, oxygen availability)

Salinity

TemperatureNutrient availabilitySlide3

Depth and Pressure

At sea level, there is 1 atmosphere (

atm

) of pressure.Each 10 meters of depth, you gain another 1 atm of pressure.Human bodies can only withstand around 3 to 4

atm

of pressure

.Slide4

Light Availability

In the ocean, the amount of light that penetrates through depends on the depth and the color of the light.

Blue light penetrates the farthest, which is why the ocean appears blue.

Red light penetrates the least.Light is needed for photosynthesis, but it can only be done in the first 200 meters of the ocean.Slide5

Salinity

Salt is added to the oceans by the eroding of rocks and rainfall bringing soils from land.

The average salinity of the ocean is 35 parts per thousand.

Ocean animals are equipped to handle salt and can not live outside of saltwater environments. Freshwater animals can not handle salt and will die if too much is introduced to their ecosystem.Slide6

Nutrient Availability

In order for photosynthesis to take place in the ocean, certain nutrients must be available to the phytoplankton (plant plankton), algae, and seagrasses.

The most important nutrients in the ocean are nitrates (NO

3-

) and phosphates (PO

4

3-

) as they are both needed by plants and algae.Slide7

Eutrophication

Eutrophication

-

excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the landCauses algal blooms (such as red tide)All the floating algae cuts off sunlight to other plants, halting photosynthesis and depleting the oxygen

Anoxic zones (also known as dead zones) form, causing massive die-offs of fish