Please use this identifier to cite or link to this item: https://doi.org/10.1371/journal.pone.0150352
Title: Light levels affect carbon utilisation in tropical seagrass under ocean acidification
Authors: Ow Y.X. 
Uthicke S.
Collier C.J.
Keywords: acetazolamide
ammonia
bicarbonate
carbon dioxide
dissolved inorganic carbon
inorganic compound
nitrate
nitrogen dioxide
trometamol
unclassified drug
carbon
sea water
acidification
Article
carbon utilization
concentration (parameters)
controlled study
Cymodocea serrulata
environmental enrichment
growth rate
Halodule uninervis
light
nonhuman
ocean environment
pH
photosynthesis
plant growth
salinity
seagrass
tropics
water quality
carbon cycle
chemistry
coral reef
ecosystem
light
metabolism
radiation response
sea
seaweed
temperature
Bicarbonates
Carbon
Carbon Cycle
Carbon Dioxide
Coral Reefs
Dose-Response Relationship, Radiation
Ecosystem
Light
Oceans and Seas
Photosynthesis
Seawater
Seaweed
Temperature
Issue Date: 2016
Citation: Ow Y.X., Uthicke S., Collier C.J. (2016). Light levels affect carbon utilisation in tropical seagrass under ocean acidification. PLoS ONE 11 (3) : 150352. ScholarBank@NUS Repository. https://doi.org/10.1371/journal.pone.0150352
Rights: Attribution 4.0 International
Abstract: Under future ocean acidification (OA), increased availability of dissolved inorganic carbon (DIC) in seawater may enhance seagrass productivity. However, the ability to utilise additional DIC could be regulated by light availability, often reduced through land runoff. To test this, two tropical seagrass species, Cymodocea serrulata and Halodule uninervis were exposed to two DIC concentrations (447 ?atm and 1077 ?atm pCO2), and three light treatments (35, 100, 380 ?mol m-2 s-1) for two weeks. DIC uptake mechanisms were separately examined by measuring net photosynthetic rates while subjecting C. serrulata and H. uninervis to changes in light and addition of bicarbonate (HCO3 -) use inhibitors (carbonic anhydrase inhibitor, acetazolamide) and TRIS buffer (pH 8.0).We observed a strong dependence on energy driven H+-HCO3 - co-transport (TRIS, which disrupts H+ extrusion) in C. serrulata under all light levels, indicating greater CO2 dependence in low light. This was confirmed when, after two weeks exposure, DIC enrichment stimulated maximum photosynthetic rates (Pmax) and efficiency (a) more in C. serrulata grown under lower light levels (36-60% increase) than for those in high light (4%increase). However, C. serrulata growth increased with both DIC enrichment and light levels. Growth, NPP and photosynthetic responses in H. uninervis increased with higher light treatments and were independent of DIC availability. Furthermore, H. uninervis was found to be more flexible in HCO3 - uptake pathways. Here, light availability influenced productivity responses to DIC enrichment, via both carbon fixation and acquisition processes, highlighting the role of water quality in future responses to OA. © 2016 Ow et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Source Title: PLoS ONE
URI: https://scholarbank.nus.edu.sg/handle/10635/161581
ISSN: 19326203
DOI: 10.1371/journal.pone.0150352
Rights: Attribution 4.0 International
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This item is licensed under a Creative Commons License Creative Commons