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Lecture 3

Lecture 3 Jan 11, 13.pdf

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BIOL 1000
Nicole Nivillac

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 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? 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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