light

Question 1

how deep does light travel

Answer 1

• Light penetrates first 100 m (deepest in the blues and the reds, others scatter) - most organisms utilizing the light will be within this distance, things like corals will be in the first 30 m for max, use of light
UV/infrared very attenuated (broken up, less useful) - only goes up to 10 m .

Question 2

where can uv damage? waves that penetrate deepest?

Answer 2

• UV/infrared very attenuated (broken up, less useful) - only goes up to 10 m .
• uv damage can occur in the intertidal area
• Blue light penetrates deepest (deeper than red)
Oceans are a heat sink for solar energy

Question 3

how may vision vary

Answer 3

varies in development 
		○ Ie. Pit with receptors (shadow detection) seen in some bethos and invertebrates 
Image formation (lens, pinhole, reflector)

Question 4

ex of nautilius vision

Answer 4

pinhole vision
○ Can discern some shapes but not in good detail
• Marine organisms lens use: move back and forth (focusing) vs changing shape
• Adjacent lenses can for a compound eye
• Ex. Bay scallop
○ Inverts using a rhabdomeric system -system of hollow tubes that are interconnect
○ Marine org. can be adapted to wavelengths (blue and green-yellow)

Question 5

marine organisms lens vs humans

Answer 5

• Marine organisms lens use: move back and forth (focusing) vs changing shape
• Adjacent lenses can for a compound eye
• Ex. Bay scallop
○ Inverts using a rhabdomeric system -system of hollow tubes that are interconnect
Marine org. can be adapted to wavelengths (blue and green-yellow)

Question 6

importance of light (4 points)

Answer 6

• Causes migrations - diurnal vertical zooplankton migrations
• Intertidal organism predator detection, mating, food, etc
• Migration (fish, invert.) using sun
Bioluminescence ( luciferin + luciferasee or aequorin + Ca2+)