Microbial community Phylogeny and function in relation to environment in the Norwegian Sea: A high-throughput community-sequencing-based assessment
Significant changes to seasonal ice cover, stratification, and warming are altering the oceanic boundaries between Polar and Atlantic Water masses. The resultant increased mixing and intrusion of Atlantic Waters into the Arctic region is resulting in novel competition between extant microbial commun...
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| Format: | Thesis |
| Language: | English |
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University of Southampton
2019
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| Online Access: | https://eprints.soton.ac.uk/436684/ https://eprints.soton.ac.uk/436684/1/Carter_Gates_Michael_PhD_Thesis_Dec_2019.pdf |
| Summary: | Significant changes to seasonal ice cover, stratification, and warming are altering the oceanic boundaries between Polar and Atlantic Water masses. The resultant increased mixing and intrusion of Atlantic Waters into the Arctic region is resulting in novel competition between extant microbial communities that drive biogeochemical cycles and underpin the food-web in these regions. However, it remains unclear how extant microbial communities will respond to these new opportunities and challenges. This work aims to provide an insight into how the bacterial and microbial eukaryotic communities present across a transect in the Norwegian Sea may be impacted by predicted future environmental change to the Arctic region through the use of Next Generation Sequencing methodologies. It is revealed that the microbial communities of the region are being partitioned into distinct assemblages that correlate with gradients of temperature and salinity. Analysis of the microbial communities from locations influenced by both Polar and Atlantic waters is used to indicate which components of the microbial communities will be selected for as these waters mix. The results of these analyses suggests the potential for the displacement of bacterial communities found at locations determined to be highly influenced by Polar Water, by bacterial communities from locations found to be primarily influenced by Atlantic Waters. This response appears consistent for all abundance fractions and constituent taxonomic groups within the bacterial community. Analysis of the eukaryotic community suggests a more complex response whereby abundant eukaryotic cold water associated species could dominate over temperate associated species, and different eukaryotic lineages display contrasting responses. Metatranscriptomes are generated for the eukaryotic community to determine the functional differences between the regional communities. Partitioning was observed which matched the gradient of Polar Water influence implying the presence of distinct genetic ... |
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