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Nitrate fertilisation does not enhance CO2 responses in two tropical seagrass species
Ow, Y.X.; Vogels, N.; Collier, C.J.; Holtum, J.A.M.; Flores, F.; Uthicke, S. (2016). Nitrate fertilisation does not enhance CO2 responses in two tropical seagrass species. NPG Scientific Reports 6(3093): 10 pp. http://hdl.handle.net/10.1038/srep23093
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

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Keywords
    Thalassia hemprichii (Ehrenberg) Ascherson, 1871 [WoRMS]; Marine

Authors  Top 
  • Ow, Y.X.
  • Vogels, N.
  • Collier, C.J.
  • Holtum, J.A.M.
  • Flores, F.
  • Uthicke, S.

Abstract
    Seagrasses are often considered "winners" of ocean acidification (OA); however, seagrass productivity responses to OA could be limited by nitrogen availability, since nitrogen-derived metabolites are required for carbon assimilation. We tested nitrogen uptake and assimilation, photosynthesis, growth, and carbon allocation responses of the tropical seagrasses Halodule uninervis and Thalassia hemprichii to OA scenarios (428, 734 and 1213 mu atm pCO(2)) under two nutrients levels (0.3 and 1.9 mu M NO3-). Net primary production (measured as oxygen production) and growth in H. uninervis increased with pCO(2) enrichment, but were not affected by nitrate enrichment. However, nitrate enrichment reduced whole plant respiration in H. uninervis. Net primary production and growth did not show significant changes with pCO(2) or nitrate by the end of the experiment (24 d) in T. hemprichii. However, nitrate incorporation in T. hemprichii was higher with nitrate enrichment. There was no evidence that nitrogen demand increased with pCO(2) enrichment in either species. Contrary to our initial hypothesis, nutrient increases to levels approximating present day flood plumes only had small effects on metabolism. This study highlights that the paradigm of increased productivity of seagrasses under ocean acidification may not be valid for all species under all environmental conditions.

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