Please use this identifier to cite or link to this item: https://doi.org/10.1038/srep23093
Title: Nitrate fertilisation does not enhance CO2 responses in two tropical seagrass species
Authors: Ow, Y.X 
Vogel, N
Collier, C.J
Holtum, J.A.M
Flores, F
Uthicke, S
Keywords: acid
carbon
carbon dioxide
fertilizer
nitric acid derivative
nitrogen
sea water
Alismatales
biomass
chemistry
classification
growth, development and aging
Hydrocharitaceae
metabolism
oxygen consumption
pH
photosynthesis
plant leaf
rhizome
sea
species difference
time factor
tropic climate
Acids
Alismatidae
Biomass
Carbon
Carbon Dioxide
Fertilizers
Hydrocharitaceae
Hydrogen-Ion Concentration
Nitrates
Nitrogen
Oceans and Seas
Oxygen Consumption
Photosynthesis
Plant Leaves
Rhizome
Seawater
Species Specificity
Time Factors
Tropical Climate
Issue Date: 2016
Publisher: Nature Publishing Group
Citation: Ow, Y.X, Vogel, 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. Scientific Reports 6 : 23093. ScholarBank@NUS Repository. https://doi.org/10.1038/srep23093
Rights: Attribution 4.0 International
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?atm pCO2) under two nutrients levels (0.3 and 1.9?M NO 3'). Net primary production (measured as oxygen production) and growth in H. uninervis increased with pCO2 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 pCO2 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 pCO2 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.
Source Title: Scientific Reports
URI: https://scholarbank.nus.edu.sg/handle/10635/182492
ISSN: 2045-2322
DOI: 10.1038/srep23093
Rights: Attribution 4.0 International
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