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Chronic light reduction reduces overall resilience to additional shading stress in the seagrass Halophila ovalis
Yaakub, S.M.; Chen, E.; Bouma, T.; Erftemeijer, P.L.A.; Todd, P.A. (2014). Chronic light reduction reduces overall resilience to additional shading stress in the seagrass Halophila ovalis. Mar. Pollut. Bull. 83: 467-474. http://dx.doi.org/10.1016/j.marpolbul.2013.11.030
In: Marine Pollution Bulletin. Macmillan: London. ISSN 0025-326X; e-ISSN 1879-3363, meer
Peer reviewed article  
Beschikbaar in  Auteurs 
Author keywords
    Acclimation; Light history; Turbidity; Sediment; Singapore
Auteurs  Top 
  • Yaakub, S.M.
  • Chen, E.
  • Bouma, T.
  • Erftemeijer, P.L.A.
  • Todd, P.A.
Abstract
    Seagrasses have substantial capacity to survive long periods of light reduction, but how acclimation to chronic low light environments may influence their ability to cope with additional stress is poorly understood. This study examines the effect of temporal light reduction by adding two levels of shading to Halophila ovalis plants in two meadows with different light histories, one characterized by a low light (turbid) environment and the other by a relatively high light (clear) environment. Additional shading resulted in complete mortality for both shading treatments at the turbid site while the clear site showed a pattern of decreased shoot density and increased photochemical efficiency (Fv/Fm) with increased shading. These contrasting results for the same species in two different locations indicate that acclimation to chronic low light regimes can affect seagrass resilience and highlights the importance of light history in determining the outcome of exposure to further (short-term) stress
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