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AuthorM.E.M., Walton
AuthorAl-Maslamani, I.
AuthorChatting, M.
AuthorSmyth, D.
AuthorCastillo, A.
AuthorSkov, M.W.
AuthorLe Vay, L.
Available date2020-11-08T10:38:04Z
Publication Date2020-10-03
Publication NameScience of The Total Environment
Identifierhttp://dx.doi.org/10.1016/j.scitotenv.2020.142677
CitationM.E.M. Walton, I. Al-Maslamani, M. Chatting, et al., Faunal mediated carbon export from mangroves in an arid area, Science of the Total Environment, https://doi.org/10.1016/j.scitotenv.2020.142677
ISSN00489697
URIhttps://www.sciencedirect.com/science/article/pii/S0048969720362069
URIhttp://hdl.handle.net/10576/16945
AbstractThe outwelling paradigm argues that mangrove and saltmarsh wetlands export much excess production to downstream marine systems. However, outwelling is difficult to quantify and currently 40–50% of fixed carbon is unaccounted for. Some carbon is thought outwelled through mobile fauna, including fish, which visit and feed on mangrove produce during tidal inundation or early life stages before moving offshore, yet this pathway for carbon outwelling has never been quantified. We studied faunal carbon outwelling in three arid mangroves, where sharp isotopic gradients across the boundary between mangroves and down-stream systems permitted spatial differentiation of source of carbon in animal tissue. Stable isotope analysis (C, N, S) revealed 22–56% of the tissue of tidally migrating fauna was mangrove derived. Estimated consumption rates showed that 1.4% (38 kg C ha−1 yr−1) of annual mangrove litter production was directly consumed by migratory fauna, with <1% potentially exported. We predict that the amount of faunally-outwelled carbon is likely to be highly correlated with biomass of migratory fauna. While this may vary globally, the measured migratory fauna biomass in these arid mangroves was within the range of observations for mangroves across diverse biogeographic ranges and environmental settings. Hence, this study provides a generalized prediction of the relatively weak contribution of faunal migration to carbon outwelling from mangroves and the current proposition, that the unaccounted-for 40–50% of mangrove C is exported as dissolved inorganic carbon, remains plausible.
SponsorQatar National Research Foundation, National Priorities Research Programme research grant: NPRP 7 - 1302 - 1 - 242
Languageen
PublisherElsevier
SubjectTrophic relay
SubjectMangrove
SubjectCarbon budget
SubjectOutwelling hypothesis
SubjectMangrove litter
SubjectCarbon flux
SubjectFish
SubjectFood webs
TitleFaunal mediated carbon export from mangroves in an arid area
TypeArticle
Open Access user License http://creativecommons.org/licenses/by/4.0/


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