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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Molecular vibrations of water predict global distr
 ibutions of phototrophic organisms in lakes and oc
 eans - Jef Huisman (Universiteit van Amsterdam)
DTSTART;TZID=Europe/London:20221013T093500
DTEND;TZID=Europe/London:20221013T101000
UID:TALK179375AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/179375
DESCRIPTION:Authors: Jef Huisman\, Tadzio Holtrop\, Maayke Sto
 mp\, Levi Biersteker\, Jeroen Aerts\, Th&eacute\;o
 phile Gr&eacute\;bert\, Fr&eacute\;d&eacute\;ric P
 artensky\, Laurence Garczarek and Hendrik Jan van 
 der Woerd\n&nbsp\;\nWhich colours of light are ava
 ilable in the aquatic ecosystems of our planet? An
 d how do these colours affect the biogeographical 
 distributions of phototrophic organisms\, such as 
 cyanobacteria\, anoxygenic phototrophic bacteria a
 nd eukaryotic algae? Stretching and bending vibrat
 ions of water molecules absorb photons of specific
  wavelengths\, a phenomenon that constrains light 
 energy available for aquatic photosynthesis. Previ
 ous work suggested that these absorption propertie
 s of water create a series of underwater light col
 ours or &lsquo\;spectral niches&rsquo\;. However\,
  the theory was still too simplified to enable pre
 diction of the spectral niches in real aquatic eco
 systems. Here\, we show with a state-of-the-art ra
 diative transfer model that the vibrational modes 
 of the water molecule delineate a series of distin
 ct spectral niches\, in the violet\, blue\, green\
 , orange\, red and infrared parts of the light spe
 ctrum. These distinct spectral niches are effectiv
 ely captured by different photosynthetic pigments 
 (chlorophylls\, bacteriochlorophylls\, phycobilin 
 pigments)\, providing insight into how different g
 roups of phototrophic organisms can flourish in di
 fferent underwater light environments. We predicte
 d the global distributions of the spectral niches 
 by satellite remote sensing\, and show that they m
 atched well with observed distribution patterns of
  cyanobacterial pigment types. Our findings provid
 e an elegant explanation for the large-scale bioge
 ographical distributions of phototrophic organisms
  across the lakes and oceans of our planet.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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