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Memorial University - Electronic Theses and Dissertations 5
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Document Description
TitleSpatial and temporal variation in the population structures, carbon use and climate responses of heterotrophic microbial communities in coastal and offshore northwest Atlantic sites
AuthorMurphy, Ryan M. J. (Ryan Matthew John), 1982-
DescriptionThesis (M.Sc.)--Memorial University of Newfoundland, 2011. Biology
Paginationix, 135 leaves : ill., maps
SubjectMarine microbiology--Atlantic Ocean, Northwest; Marine microbial ecology--Atlantic Ocean, Northwest; Carbon cycle (Biogeochemistry)--Atlantic Ocean, Northwest
Degree GrantorMemorial University of Newfoundland. Dept. of Biology
Spatial CoverageAtlantic Ocean
NotesBibliography: leaves 118-135.
AbstractHeterotrophic marine micorbes were studied across spatial and temporal scales in the northwest Atlantic to investigate microbial communities' structural and functional responses to climate-relevant environmental forcings. Cellular abundance, morphometric, and 16S RNA-targetted Fluorescent In Situ Hybridization (FISH) analyses were used to examine variation in microbe-mediated carbon flow as it pertained to grazing pressure, temperature-shifts, and dissolved organic matter (DOM) availability. Significant spatial differences in growth and biomass production versus experimental manipulations indicate climate-driven physical changes in the upper ocean may influence future basin-scale patterns of the biogeochemical cycling of carbon. Seasonal variation of cell size and growth during grazer-exclusion experiments points to the increasing importance of inorganic nutrient limitation on plankton dynamics in a warming ocean. Analysis of grazing control on microbial communities relative to current and predicted ocean temperatures also suggests impacts of a warming ocean on spring phytoplankton bloom initiation and on carbon cycling in the upper ocean.
Resource TypeElectronic thesis or dissertation
FormatImage/jpeg; Application/pdf
SourcePaper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries
RightsThe author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission.
CollectionElectronic Theses and Dissertations
Scanning StatusCompleted
PDF File(14.02 MB) --
CONTENTdm file name25312.cpd