THESIS
2021
1 online resource (xv, 211 pages) : color illustrations, color maps
Abstract
Estuaries are key components of global ecosystems linking the lands and oceans and play
a vital part in both economic and ecological aspects. Archaea are ubiquitous in terrestrial and
aquatic ecosystems, and they are necessarily players participating global biogeochemical cycles.
The current study offers comprehensive understandings of aquatic and sedimentary archaeal
communities in the Pearl River Estuary (PRE), the Jiulong River Estuary (JRE), the Changjiang
River Estuary (CRE) and surrounding coastal regions, with the focus of ammonia-oxidizing
archaea (AOA) and Bathyarchaeota. Through the investigate of sedimentary archaeal
community in the PRE, we found that Bathyarchaeota was the predominant archaeal phylum
which was mainly partitioned by the salinity. In the CRE, multivariate ana...[
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Estuaries are key components of global ecosystems linking the lands and oceans and play
a vital part in both economic and ecological aspects. Archaea are ubiquitous in terrestrial and
aquatic ecosystems, and they are necessarily players participating global biogeochemical cycles.
The current study offers comprehensive understandings of aquatic and sedimentary archaeal
communities in the Pearl River Estuary (PRE), the Jiulong River Estuary (JRE), the Changjiang
River Estuary (CRE) and surrounding coastal regions, with the focus of ammonia-oxidizing
archaea (AOA) and Bathyarchaeota. Through the investigate of sedimentary archaeal
community in the PRE, we found that Bathyarchaeota was the predominant archaeal phylum
which was mainly partitioned by the salinity. In the CRE, multivariate analyses suggested that
the archaeal community compositions and distribution patterns were different in the sediments
of hypoxia and non-hypoxia regions, while Thaumarchaeota and Bathyarchaeota were major
community components. Besides, we observed that the ammonia oxidation in regions of these
estuaries was mainly contributed by AOA, and the major AOA groups were identified.
Moreover, a new AOA species was discovered in the JRE through metagenomics. The potential
adaption strategies of AOA in the estuarine environments were uncovered through genomic
comparisons. Furthermore, comparative analysis was employed to reveal the genomic
differences among AOA dwelled in different estuaries, in order to better understand their
distribution patterns, metabolic potentials, and evolutionary clues, which also highlights their unique niches in estuaries. Altogether, our study illustrated the detailed archaeal community in
the three estuaries, and identified potential influencing factors for the distribution of archaeal
community, which might enlighten subsequent studies by offering a comprehensive
understanding of estuarine archaea.
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