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    Decreasing carbonate load of seagrass leaves with increasing latitude

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    Type
    Article
    Authors
    Mazarrasa, Inés
    Marbà, Núria
    Krause-Jensen, D.
    Kennedy, Hilary
    Santos, Rui
    Lovelock, Catherine E.
    Duarte, Carlos M. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2019-07-21
    Online Publication Date
    2019-07-21
    Print Publication Date
    2019-12
    Embargo End Date
    2021-07-21
    Permanent link to this record
    http://hdl.handle.net/10754/656772
    
    Metadata
    Show full item record
    Abstract
    Seagrass meadows play a significant role in the formation of carbonate sediments, serving as a substrate for carbonate-producing epiphyte communities. The magnitude of the epiphyte load depends on plant structural and physiological parameters, related to the time available for epiphyte colonization. Yet, the carbonate accumulation is likely to also depend on the carbonate saturation state of seawater (Ω) that tends to decrease as latitude increases due to decreasing temperature and salinity. A decrease in carbonate accumulation with increasing latitude has already been demonstrated for other carbonate producing communities. The aim of this study was to assess whether there was any correlation between latitude and the epiphyte carbonate load and net carbonate production rate on seagrass leaves. Shoots from 8 different meadows of the Zostera genus distributed across a broad latitudinal range (27 °S to up to 64 °N) were sampled along with measurements of temperature and Ω. The Ω within meadows significantly decreased as latitude increased and temperature decreased. The mean carbonate content and load on seagrass leaves ranged from 17% DW to 36% DW and 0.4–2.3 mg CO3 cm−2, respectively, and the associated mean carbonate net production rate varied from 0.007 to 0.9 mg CO3 cm−2 d-1. Mean carbonate load and net production rates decreased from subtropical and tropical, warmer regions towards subpolar latitudes, consistent with the decrease in Ω. These results point to a latitudinal variation in the contribution of seagrass to the accumulation of carbonates in their sediments which affect important processes occurring in seagrass meadows, such as nutrient cycling, carbon sequestration and sediment accretion.
    Citation
    Mazarrasa, I., Marbà, N., Krause-Jensen, D., Kennedy, H., Santos, R., Lovelock, C. E., & Duarte, C. M. (2019). Decreasing carbonate load of seagrass leaves with increasing latitude. Aquatic Botany, 159, 103147. doi:10.1016/j.aquabot.2019.103147
    Sponsors
    I.M. was supported by a Pre-Doctoral fellowship by the Government of the Balearic Islands, D.K.-J. was supported by the COCOA project under the BONUS program funded by the EU 7th framework program and the Danish Research Council. The study is also a contribution to the Greenland Ecosystem Monitoring programme (www.G-E-M.dk), the Arctic Science Partnership (ASP, asp-net.org) and the project PTDC/MAR-EST/3223/2014 of Foundation of Science and Technology of Portugal (FCT). We thank B. Ondiviela and M. Recio from IHCantabria for the support with sampling.
    Publisher
    Elsevier B.V.
    Journal
    Aquatic Botany
    DOI
    10.1016/j.aquabot.2019.103147
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0304377018301955
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.aquabot.2019.103147
    Scopus Count
    Collections
    Articles; Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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