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@ARTICLE{Rascher:15617,
      author       = {Rascher, U. and Freiberg, M. and Lüttge, U.},
      title        = {{F}unctional diversity of photosynthetic light use of
                      sixteen vascular epiphyte species under fluctuating
                      irradiance in the canopy of a gianta {V}irola michelii
                      ({M}yristicaceae) tree in the tropical lowland forest of
                      {F}rench {G}uyana},
      journal      = {Frontiers in plant science: FPLS},
      volume       = {2},
      issn         = {1664-462X},
      address      = {Lausanne},
      publisher    = {Frontiers Media},
      reportid     = {PreJuSER-15617},
      pages        = {1 - 12},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Here we present the first study, in which a large number of
                      different vascular epiphyte species were measured for their
                      photosynthetic performance in the natural environment of
                      their phorophyte in the lowland rainforest of French Guyana.
                      More than 70 epiphyte species covered the host tree in a
                      dense cover. Of these, the photosynthesis of 16 abundant
                      species was analyzed intensely over several months.
                      Moreover, the light environment was characterized with newly
                      developed light sensors that recorded continuously and with
                      high temporal resolution light intensity next to the
                      epiphytes. Light intensity was highly fluctuating and showed
                      great site specific spatio-temporal variations of
                      photosynthetic photon flux. Using a novel computer routine
                      we quantified the integrated light intensity the epiphytes
                      were exposed to in a 3 h window and we related this light
                      intensity to measurements of the actual photosynthetic
                      status. It could be shown that the photosynthetic apparatus
                      of the epiphytes was well adapted to the quickly changing
                      light conditions. Some of the epiphytes were chronically
                      photoinhibited at predawn and significant acute
                      photoinhibition, expressed by a reduction of potential
                      quantum efficiency (F(v)/F(m))(30'), was observed during the
                      day. By correlating (F(v)/F(m))(30') to the integrated and
                      weighted light intensity perceived during the previous
                      3 h, it became clear that acute photoinhibition was
                      related to light environment prior to the measurements.
                      Additionally photosynthetic performance was not determined
                      by rain events, with the exception of an Aechmea species.
                      This holds true for all the other 15 species of this study
                      and we thus conclude that actual photosynthesis of these
                      tropical epiphytes was determined by the specific and
                      fluctuating light conditions of their microhabitat and
                      cannot be simply attributed to light-adapted ancestors.},
      cin          = {IBG-2},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22629271},
      pmc          = {pmc:PMC3355546},
      UT           = {WOS:000208837800013},
      doi          = {10.3389/fpls.2011.00117},
      url          = {https://juser.fz-juelich.de/record/15617},
}