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

“Diversity of Ocean Life & Productivity”

15.2 & 15.3

What are some types of different ocean organisms?

ScalesShellsLightsSuckersTeethNo TeethHardSoftFast Slow

Where do these things live?!

• Most ocean organisms live in sunny surface waters

• ↑ Sun = ↑ Algae• Algae = food.

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”

Marine Life Zones

Affected by:1. Available Sunlight2. Distance from Shore3. Water Depth

Sunlight

Photic Zone• “Photos” = light• Where there is light

Depth of light:– Amount of Nekton– Sediment particles– Intensity of sunlight

Distance from Shore

1. Intertidal Zone– Beach

2. Neritic Zone– Cont’l. Shelf– Most ocean life

3. Oceanic Zone– Cold, deep, dark

Water Depth

1. Pelagic Zone– Open ocean– Any depth

2. Benthic Zone– Seafloor

3. Abyssal Zone– Deep Benthic

Zone– ↑ Pressure!– Little Life.

Marine Productivity!

Producer makes stuff– Photosynthesis– Chemosynthesis

Consumer uses stuff– Chemical energy is transferred by feeding.– Feeding = Inefficient!

Inefficient! Loses energy with each step!

Food Chain

Food Web

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

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)