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Lecture 3

Lecture 3 Jan 11, 13.pdf

14 Pages
111 Views

Department
Biology
Course Code
BIOL 1000
Professor
Nicole Nivillac

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Light in Aquatic Habitats
Aquatic habits have altered light environments
Water rapidly attenuates longer wavelengths
(red) of light
Below 30 m, only blue wavelengths of light
penetrate
Below about 150 m, there is total absence of
light
So what do you think happens to the coloring
of species are you get deeper and deeper?
Organisms Making Their Own Light:
Bioluminescence
Range of organisms can use chemical energy
to make light referred to as bioluminescence
Bio = living Lumen = Light
Bioluminescent organisms use light to:
Attract a mate
Camouflage
Attract prey
Communicate

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Description
Light in Aquatic Habitats • Aquatic habits have altered light environments • Water rapidly attenuates longer wavelengths (red) of light • Below 30 m, only blue wavelengths of light penetrate • Below about 150 m, there is total absence of light • So what do you think happens to the coloring of species are you get deeper and deeper? Organisms Making Their Own Light: Bioluminescence • Range of organisms can use chemical energy to make light referred to as bioluminescence Bio = living Lumen = Light • Bioluminescent organisms use light to: – Attract a mate – Camouflage – Attract prey – Communicate Bioluminescence http://deepbluehome.blogspot.com/2010/06/random-excerpt-bioluminescence.html http://www.boddunan.com/component/contp://www.solarnavigator.net/films_movies_a ent/article/72-animals/4529-have-you- ctors/cartoons/finding_nemo.htm heard-of-bioluminescence.html IS THERE A DARK SIDE OF LIGHT? The dark side of light? • Light can damage biological molecules (including DNA). What could happen if DNA is damaged? Purines: Adenine Guanine Pyrimidines: Thymine Cytosine Dimer How can this be repaired? http://www.water.aero/disinfection.html The dark side of light • How can we be protected from sun damage? Figure 2. Relationship of Skin Color to Latitude Barsh GS, 2003 What Controls Variation in Human Skin Color?. PLoSBiol 1(1): e27. doi:10.1371/journal.pbi
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