Paleoreconstruction of estuarine sediments reveal human-induced weakening of coastal carbon sinks

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dc.contributor.author Macreadie, Peter en_US
dc.contributor.author Allen, Katie en_US
dc.contributor.author Kelaher, Brendan en_US
dc.contributor.author Ralph, Peter en_US
dc.contributor.author Skilbeck, Greg en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-10-12T03:33:27Z
dc.date.available 2012-10-12T03:33:27Z
dc.date.issued 2012 en_US
dc.identifier 2010005973 en_US
dc.identifier.citation Macreadie Peter et al. 2012, 'Paleoreconstruction of estuarine sediments reveal human-induced weakening of coastal carbon sinks', Blackwell, vol. 18, no. 3, pp. 891-901. en_US
dc.identifier.issn 1354-1013 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/18154
dc.description.abstract Human activities in coastal areas frequently cause loss of benthic macrophytes (e.g. seagrasses) and concomitant increases in microalgal production through eutrophication. Whether such changes translate into shifts in the composition of sediment detritus is largely unknown, yet such changes could impact the role these ecosystems play in sequestrating CO2. We reconstructed the sedimentary records of cores taken from two sites within Botany Bay, Sydney the site of European settlement of Australia to look for human-induced changes in dominant sources of detritus in this estuary. Cores covered a period from the present day back to the middle Holocene (6000years) according to 210Pb profiles and radiocarbon (14C) dating. Depositional histories at both sites could not be characterized by a linear sedimentation rate; sedimentation rates in the last 3050years were considerably higher than during the rest of the Holocene. C:N ratios declined and began to exhibit a microalgal source signature from around the time of European settlement, which could be explained by increased nutrient flows into the Bay caused by anthropogenic activity. Analysis of stable isotopic ratios of 12C/13C showed that the relative contribution of seagrass and C3 terrestrial plants (mangroves, saltmarsh) to detritus declined around the time of rapid industrial expansion (1950s), coinciding with an increase in the contribution of microalgal sources. We conclude that the relative contribution of microalgae to detritus has increased within Botany Bay, and that this shift is the sign of increased industrialization and concomitant eutrophication. en_US
dc.language en_US
dc.publisher Blackwell en_US
dc.relation.isbasedon http://dx.doi.org/10.1111/j.1365-2486.2011.02582.x en_US
dc.title Paleoreconstruction of estuarine sediments reveal human-induced weakening of coastal carbon sinks en_US
dc.parent Global Change Biology en_US
dc.journal.volume 18 en_US
dc.journal.number 3 en_US
dc.publocation UK en_US
dc.identifier.startpage 891 en_US
dc.identifier.endpage 901 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060200 en_US
dc.personcode 108249 en_US
dc.personcode 0000071181 en_US
dc.personcode 040098 en_US
dc.personcode 890085 en_US
dc.personcode 870360 en_US
dc.percentage 100 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords biosequestration; blue carbon; carbon capture and storage; detritus; eutrophication; mangrove; microalgae; organic carbon; seagrass; stable isotopes en_US
dc.staffid en_US
dc.staffid 870360 en_US


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