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Publication Type J
Authors Borum, J; Pedersen, O; Kotula, L; Fraser, MW; Statton, J; Colmer, TD; Kendrick, GA
Author Full Name Borum, Jens; Pedersen, Ole; Kotula, Lukasz; Fraser, Matthew W.; Statton, John; Colmer, Timothy D.; Kendrick, Gary A.
Title Photosynthetic response to globally increasing CO2 of co-occurring temperate seagrass species
Source PLANT CELL AND ENVIRONMENT
Language English
Document Type Article
Author Keywords bicarbonate utilization; increasing atmospheric CO2; internal aeration; net photosynthesis
Keywords Plus INORGANIC CARBON UTILIZATION; EELGRASS ZOSTERA-MARINA; CLIMATE-CHANGE; AQUATIC MACROPHYTES; SULFIDE INTRUSION; MACROALGAE; PLANTS; BUFFER; LIGHT; ACID
Abstract Photosynthesis of most seagrass species seems to be limited by present concentrations of dissolved inorganic carbon (DIC). Therefore, the ongoing increase in atmospheric CO2 could enhance seagrass photosynthesis and internal O-2 supply, and potentially change species competition through differential responses to increasing CO2 availability among species. We used short-term photosynthetic responses of nine seagrass species from the south-west of Australia to test species-specific responses to enhanced CO2 and changes in HCO3-. Net photosynthesis of all species except Zostera polychlamys were limited at pre-industrial compared to saturating CO2 levels at light saturation, suggesting that enhanced CO2 availability will enhance seagrass performance. Seven out of the nine species were efficient HCO3- users through acidification of diffusive boundary layers, production of extracellular carbonic anhydrase, or uptake and internal conversion of HCO3-. Species responded differently to near saturating CO2 implying that increasing atmospheric CO2 may change competition among seagrass species if co-occurring in mixed beds. Increasing CO2 availability also enhanced internal aeration in the one species assessed. We expect that future increases in atmospheric CO2 will have the strongest impact on seagrass recruits and sparsely vegetated beds, because densely vegetated seagrass beds are most often limited by light and not by inorganic carbon.
Author Address [Borum, Jens; Pedersen, Ole] Univ Copenhagen, Freshwater Biol Lab, Dept Biol, Univ Pk 4,3rd Floor, DK-2100 Copenhagen, Denmark; [Pedersen, Ole] Univ Western Australia, Inst Adv Studies, Crawley, WA 6009, Australia; [Pedersen, Ole; Kotula, Lukasz; Fraser, Matthew W.; Statton, John; Colmer, Timothy D.; Kendrick, Gary A.] Univ Western Australia, Sch Plant Biol, Crawley, WA 6009, Australia; [Fraser, Matthew W.; Statton, John; Kendrick, Gary A.] Univ Western Australia, Oceans Inst, Crawley, WA 6009, Australia
Reprint Address Borum, J (reprint author), Univ Copenhagen, Freshwater Biol Lab, Dept Biol, Univ Pk 4,3rd Floor, DK-2100 Copenhagen, Denmark.
E-mail Address jborum@bio.ku.dk
ResearcherID Number Fraser, Matthew/K-5302-2012; Kotula, Lukasz/H-8124-2012
ORCID Number Fraser, Matthew/0000-0003-2309-8074; Kotula, Lukasz/0000-0001-8760-7099; Borum, Jens/0000-0002-4861-6563; Pedersen, Ole/0000-0002-0827-946X
Funding Agency and Grant Number Australian Research Council [LP100200429, LP130100155]; Danish Council for Strategic Research (NOVAGRASS) [12-132701]
Funding Text We thank Andrea Zavala Perez and Bonnie Laverock for valuable field assistance. We thank the WA Department of Parks and Wildlife for permissions to collect plant material (SW016179). This work was funded by the Australian Research Council (GAK: LP100200429, LP130100155) and the Danish Council for Strategic Research (NOVAGRASS, grant no. 12-132701). We thank the UWA Institute of Advanced Studies for hosting Ole Pedersen during his visits to UWA. None of the authors have conflicts of interest.
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Cited Reference Count 51
Times Cited 4
Total Times Cited Count (WoS, BCI, and CSCD) 4
Publisher WILEY-BLACKWELL
Publisher City HOBOKEN
Publisher Address 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
ISSN 0140-7791
29-Character Source Abbreviation PLANT CELL ENVIRON
ISO Source Abbreviation Plant Cell Environ.
Publication Date JUN
Year Published 2016
Volume 39
Issue 6
Beginning Page 1240
Ending Page 1250
Digital Object Identifier (DOI) 10.1111/pce.12658
Page Count 11
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number DT5BL
Unique Article Identifier WOS:000381495500008
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