Seaweeds & Light: A Coloring Mystery

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Light at the blue end of the spectrum penetrates underwater more effectively, influencing the coloration of seaweeds. Seaweeds often appear yellow-brown because their pigments absorb blue light, reflecting the longer wavelengths of red and yellow. This absorption and reflection process explains the predominant colors we observe in seaweeds. The phenomenon highlights the relationship between light penetration and pigment absorption in aquatic environments. Understanding this can enhance knowledge of marine biology and ecology.
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1. Light at the blue end of the spectrum penetrates most easily underwater. Why are seaweeds often yellow-brown in colour?

Does anyone know why this phenomena occurs? Thanks
 
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Since light at the blue end of the spectrum penetrates most easily under water, it is these colours which are being absorbed by the pigments. What we see is the wavelengths that are transmitted or reflected. Therefore, it is the other end of the spectrum which we are seeing (red-yellow.)
 

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