Seasonal and spatial changes in the export and deposition of biogenic matter in a submarine canyon system of the Lower St. Lawrence Estuary, eastern Canada

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dc.contributor.advisorLimoges, Audrey
dc.contributor.advisorSherwood, Owen
dc.contributor.authorSharpe, Hannah
dc.date.accessioned2024-02-20T14:39:40Z
dc.date.available2024-02-20T14:39:40Z
dc.date.issued2023-08
dc.description.abstractThe Pointe-des-Monts coastal shelf, located on the northern shore of the Lower St. Lawrence Estuary, hosts active submarine canyons. This work documents seasonal and spatial variations in biogenic matter export, inside and outside the canyon system, based on the analyses of 69 sequential sediment trap samples (November 2020 to September 2021) and 29 surface seafloor sediment samples. Our data reveal that small sediment resuspension events in the canyon impact biogeochemical cycling in the deep water-column layer. Sinking phytoplankton fluxes and deposited microfossil abundances were lower in the canyon system, providing no evidence that canyon processes enhance primary and secondary production at Pointe-des-Monts. The potentially harmful taxa Pseudo-nitzschia seriata, Dinophysis acuminata, and D. norvegica were observed in the sediment traps while cysts of cf. Alexandrium spp. were preserved in most surface sediment samples. The sediment trap samples cover an anomalous nearly ice-free winter, providing insight into future climate-related trends in biogenic export.
dc.description.copyright© Hannah Sharpe, 2023
dc.format.extentxiii, 133
dc.format.mediumelectronic
dc.identifier.oclc(OCoLC)1426766369en
dc.identifier.otherThesis 11285en
dc.identifier.urihttps://unbscholar.lib.unb.ca/handle/1882/37708
dc.language.isoen
dc.publisherUniversity of New Brunswick
dc.relationRéseau Québec maritime (RQM)
dc.relationMarine Environmental Observation, Prediction, and Response Network (MEOPAR)
dc.rightshttp://purl.org/coar/access_right/c_abf2
dc.subject.disciplineEarth Sciences
dc.subject.lcshSubmarine valleys--Québec (Province)--Saint Lawrence River Estuary.en
dc.subject.lcshSediment transport--Québec (Province)--Saint Lawrence River Estuary.en
dc.subject.lcshClimatic changes--Québec (Province)--Saint Lawrence River Estuary.en
dc.subject.lcshSaint Lawrence River Estuary (Québec)en
dc.titleSeasonal and spatial changes in the export and deposition of biogenic matter in a submarine canyon system of the Lower St. Lawrence Estuary, eastern Canada
dc.typemaster thesis
oaire.license.conditionother
thesis.degree.disciplineEarth Sciences
thesis.degree.grantorUniversity of New Brunswick
thesis.degree.levelmasters
thesis.degree.nameM.Sc.

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