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Photosynthesis Research

, Volume 132, Issue 3, pp 257–264 | Cite as

Light dose versus rate of delivery: implications for macroalgal productivity

  • Matthew J. DesmondEmail author
  • Daniel W. Pritchard
  • Christopher D. Hepburn
Original Article
  • 282 Downloads

Abstract

The role of how light is delivered over time is an area of macroalgal photosynthesis that has been overlooked but may play a significant role in controlling rates of productivity and the structure and persistence of communities. Here we present data that quantify the relative influence of total quantum dose and delivery rate on the photosynthetic productivity of five ecologically important Phaeophyceae species from southern New Zealand. Results suggested that greater net oxygen production occurs when light is delivered at a lower photon flux density (PFD) over a longer period compared to a greater PFD over a shorter period, given the same total dose. This was due to greater efficiency (α) at a lower PFD which, for some species, meant a compensatory effect can occur. This resulted in equal or greater productivity even when the total quantum dose of the lower PFD was significantly reduced. It was also shown that light limitation at Huriawa Peninsula, where macroaglae were sourced, may be restricting the acclimation potential of species at greater depths, and that even at shallow depth periods of significant light limitation are likely to occur. This research is of particular interest as the variability of light delivery to coastal reef systems increases as a result of anthropogenic disturbances, and as the value of in situ community primary productivity estimates is recognised.

Keywords

Photosynthesis Photon flux density Macroalgae Productivity Light dose Light delivery 

Notes

Acknowledgements

We gratefully thank Sean Hesteltine, Emma Kearney, Brenton Twist and Peri Subritzky for assistance with fieldwork. We also acknowledge the East Otago Taiāpure Committee for their support with work carried out within the management area.

Supplementary material

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Supplementary material 1 (JPG 537 KB)
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Supplementary material 2 (JPG 1144 KB)
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Supplementary material 3 (DOCX 12 KB)

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Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Matthew J. Desmond
    • 1
    Email author
  • Daniel W. Pritchard
    • 2
    • 3
  • Christopher D. Hepburn
    • 4
  1. 1.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand
  2. 2.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand
  3. 3.Te Ao Tūroa, Te Rūnanga o Ngāi TahuDunedinNew Zealand
  4. 4.Department of Marine ScienceUniversity of OtagoDunedinNew Zealand

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