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Diel patterns of microphytobenthic primary production in intertidal sediments: the role of photoperiod on the vertical migration circadian rhythm.
Haro, S; Bohórquez, J; Lara, M; Garcia-Robledo, E; González, C J; Crespo, J M; Papaspyrou, S; Corzo, A.
Affiliation
  • Haro S; Department of Biology, University of Cádiz, Puerto Real, 11510, Spain. sara.haro@uca.es.
  • Bohórquez J; Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, Campus de Excelencia Internacional del Mar (CEIMAR). Campus Universitario de Puerto Real, Puerto Real (Cádiz), 11510, Spain. sara.haro@uca.es.
  • Lara M; Department of Biology, University of Cádiz, Puerto Real, 11510, Spain.
  • Garcia-Robledo E; Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, Campus de Excelencia Internacional del Mar (CEIMAR). Campus Universitario de Puerto Real, Puerto Real (Cádiz), 11510, Spain.
  • González CJ; Department of Biology, University of Cádiz, Puerto Real, 11510, Spain.
  • Crespo JM; Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, Campus de Excelencia Internacional del Mar (CEIMAR). Campus Universitario de Puerto Real, Puerto Real (Cádiz), 11510, Spain.
  • Papaspyrou S; Department of Biology, University of Cádiz, Puerto Real, 11510, Spain.
  • Corzo A; Instituto Universitario de Investigación Marina (INMAR), Universidad de Cádiz, Campus de Excelencia Internacional del Mar (CEIMAR). Campus Universitario de Puerto Real, Puerto Real (Cádiz), 11510, Spain.
Sci Rep ; 9(1): 13376, 2019 09 16.
Article de En | MEDLINE | ID: mdl-31527648
Diel primary production patterns of intertidal microphytobenthos (MPB) have been attributed to short-term physiological changes in the photosynthetic apparatus or to diel changes in the photoautotrophic biomass in the sediment photic layer due to vertical migration. Diel changes in primary production and vertical migration are entrained by external factors like photoperiod and tides. However, the role of photoperiod and tides has not been experimentally separated to date. Here, we performed laboratory experiments with sediment cores kept in immersion, in the absence of tides, with photoperiod or under continuous light. Measurements of net production, made with O2 microsensors, and of spectral reflectance at the sediment surface showed that, in intertidal sediments, the photoperiod signal was the major driver of the diel patterns of net primary production and sediment oxygen availability through the vertical migration of the MPB photoautotrophic biomass. Vertical migration was controlled by an endogenous circadian rhythm entrained by photoperiod in the absence of tides. The pattern progressively disappeared after 3 days in continuous light but was immediately reset by photoperiod. Even though a potential contribution of a subjective in situ tidal signal cannot be completely discarded, Fourier and cross spectral analysis of temporal patterns indicated that the photosynthetic circadian rhythm was mainly characterized by light/dark migratory cycles.

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Sci Rep Année: 2019 Type de document: Article Pays d'affiliation: Espagne Pays de publication: Royaume-Uni

Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Sci Rep Année: 2019 Type de document: Article Pays d'affiliation: Espagne Pays de publication: Royaume-Uni