Water flow influences oxygen transport and photosynthetic efficiency in corals

Finelli, Christopher M and Helmuth, Brian and Pentcheff, N. Dean and Wethey, David S. (2005) Water flow influences oxygen transport and photosynthetic efficiency in corals. Technical Report.

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    Recent studies indicate that the incidence and persistence of damage from coral reef bleaching are often highest in areas of restricted water motion, and that resistance to and recovery from bleaching is increased by enhanced water motion. We examined the hypothesis that water motion increases the efflux of oxygen from coral tissue thereby reducing oxidative stress on the photosynthetic apparatus of endosymbiotic zooxanthellae. We experimentally exposed colonies of Montastrea annularis and Agaricia agaricites to manipulations of water flow, light intensity, and oxygen concentration in the field using a novel mini-flume. We measured photosynthetic efficiency using a pulse amplitude modulated fluorometer to test the short-term response of corals to our manipulations. Under normal oxygen concentrations, A. agaricites showed a significant 8% increase in photosynthetic efficiency from 0.238 (± 0.032) in still water to 0.256 (± 0.037) in 15 cm s�1 flow, while M. annularis exhibited no detectable change. Under high-ambient oxygen concentrations, the observed effect of flow on A. agaricites was reversed: photosynthetic efficiencies showed a significant 11% decrease from 0.236 (± 0.056) in still water to 0.211

    Item Type: Technical Reports (Technical Report)
    Related URLs:
      Publisher: Springer-Verlag 2005
      Keywords: Bleaching, Mass transfer, Hydrodynamics, Physiological stress
      Subjects: (A) Biodiversity > (AF) Invertebrates > (AFB) Marine
      (Z) Other or Unspecified
      Publication Sources: (3) Other Source > (3D) Other or Unspecified
      Date Deposited: 20 Aug 2015 11:54
      Last Modified: 20 Aug 2015 11:54
      URI: http://eprints.uberibz.org/id/eprint/1525

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