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Vibrational modes of water predict spectral niches for photosynthesis in lakes and oceans
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Vibrational modes of water predict spectral niches for photosynthesis in lakes and oceans
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Journal Article
Vibrational modes of water predict spectral niches for photosynthesis in lakes and oceans
2021
Overview
Stretching and bending vibrations of water molecules absorb photons of specific wavelengths, a phenomenon that constrains light energy available for aquatic photosynthesis. Previous work suggested that these absorption properties of water create a series of spectral niches but the theory was still too simplified to enable prediction of the spectral niches in real aquatic ecosystems. Here, we show with a state-of-the-art radiative transfer model that the vibrational modes of the water molecule delineate five spectral niches, in the violet, blue, green, orange and red parts of the spectrum. These five niches are effectively captured by chlorophylls and phycobilin pigments of cyanobacteria and their eukaryotic descendants. Global distributions of the spectral niches are predicted by satellite remote sensing and validated with observed large-scale distribution patterns of cyanobacterial pigment types. Our findings provide an elegant explanation for the biogeographical distributions of photosynthetic pigments across the lakes and oceans of our planet.
Starting from the vibrational modes of water molecules, the authors derive five major spectral niches in aquatic ecosystems using a radiative transfer model. They then predict the global distributions of these spectral niches using remote sensing and validate the predictions with metagenomic data on the distribution patterns of cyanobacterial pigments.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature
Subject
/ 631/158
/ 704/286
/ 704/829
/ Biological and Physical Anthropology
/ Biomedical and Life Sciences
/ Ecology
/ Lakes
/ Microbiology and Parasitology
/ Niches
/ Oceans
/ Photons
/ Pigments
/ Spectra
/ Water
/ Zoology
