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Warm-up Week 3 # 21. __________ is NOT a process that decreases the
salinity of seawater.a. icebergs melting c. runoff from landb. precipitation d. evaporation
2. The ________ layer of the ocean experiences a rapid change in density with depth.a. deep zone c. thermoclineb. mixed zone d. pycnocline
3. ________ is a major source of elements in seawater.a. solar radiation c. lakesb. Earth’s interior d. meteorites
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“Diversity of Ocean Life & Productivity”
15.2 & 15.3
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What are some types of different ocean organisms?
ScalesShellsLightsSuckersTeethNo TeethHardSoftFast Slow
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Where do these things live?!
• Most ocean organisms live in sunny surface waters
• ↑ Sun = ↑ Algae• Algae = food.
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Classifying Marine Organisms:
Where live & How move.
1. Plankton– Floaters (drift with currents)– Planktos = “wandering”
2. Nekton– Swimmers (in control)– Nektos = “swimming”
3. Benthos– Bottom dwelling– Benthos = “bottom”
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Marine Life Zones
Affected by:1. Available Sunlight2. Distance from Shore3. Water Depth
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Sunlight
Photic Zone• “Photos” = light• Where there is light
Depth of light:– Amount of Nekton– Sediment particles– Intensity of sunlight
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Distance from Shore
1. Intertidal Zone– Beach
2. Neritic Zone– Cont’l. Shelf– Most ocean life
3. Oceanic Zone– Cold, deep, dark
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Water Depth
1. Pelagic Zone– Open ocean– Any depth
2. Benthic Zone– Seafloor
3. Abyssal Zone– Deep Benthic
Zone– ↑ Pressure!– Little Life.
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Marine Productivity!
Producer makes stuff– Photosynthesis– Chemosynthesis
Consumer uses stuff– Chemical energy is transferred by feeding.– Feeding = Inefficient!
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Inefficient! Loses energy with each step!
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Food Chain
Food Web
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REVIEW:1. If you lived in the ocean and you had no arms and
no legs what kind of marine organism would you be?
2. What are the 3 things that affect marine life zones?
3. What happens every time energy is transferred through feeding?
Nekton = Float with currents
Sunlight, distance from shore, water depth
Energy is LOST
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Warm-up1. How do plankton differ from nekton?a. Plankton are floaters. c. Plankton are carnivores.b. Plankton are strong swimmers d. Plankton live on the ocean
bottom.
2. The ___________ is the ocean zone is characterized by high water pressure, low temperatures, and no sunlight.a. pelagic zone c. abyssal zoneb. intertidal zone d. neritic zone
3. Which animal(s) would have the greatest chance of survival?a. one that fed through a food web b. one that fed through a food chainc. one that ate a wide variety of preyd. both a and c (food web & variety of prey)