https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:36776 Wed 29 Mar 2023 12:02:43 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45143 Trichodesmium. During an oceanographic transect from the Arafura Sea through the Torres Strait to the Coral Sea, we characterized prokaryotic and eukaryotic phytoplankton communities in surface waters using a combination of flow cytometry and Illumina based 16S and 18S ribosomal RNA amplicon sequencing. Similar to observations in other marine regions around Australian, phytoplankton assemblages throughout this entire region were rich in unicellular picocyanobacterial primary producers while picoeukaryotic phytoplankton formed a consistent, though smaller proportion of the photosynthetic biomass. Major taxonomic groups displayed distinct biogeographic patterns linked to oceanographic and nutrient conditions. Unicellular picocyanobacteria dominated in both flow cytometric abundance and carbon biomass, with members of the Synechococcus genus dominating in the shallower Arafura Sea and Torres Strait where chlorophyll a was relatively higher (averaging 0.4 ± 0.2 mg m^-3), and Prochlorococcus dominating in the oligotrophic Coral Sea where chlorophyll a averaged 0.13 ± 0.07 mg m^-3. Consistent with previous microscopic and pigment-based observations, we found from sequence analysis that a variety of diatoms (Bacillariophyceae) exhibited high relative abundance in the Arafura Sea and Torres Strait, while dinoflagellates (Dinophyceae) and prymnesiophytes (Prymnesiophyceae) were more abundant in the Coral Sea. Ordination analysis identified temperature, nutrient concentrations and water depth as key drivers of the region’s assemblage composition. This is the first molecular and flow cytometric survey of the abundance and diversity of both prokaryotic and picoeukaryotic phytoplankton in this region, and points to the need to include the picocyanobacterial populations as an essential oceanic variable for sustained monitoring in order to better understand the health of these important coastal waters as global oceans change.]]> Wed 26 Oct 2022 13:40:53 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54329 Tue 20 Feb 2024 15:59:35 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39166 Tue 14 Nov 2023 12:24:12 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43319 Thu 15 Sep 2022 14:29:31 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51964 2 μm) of microbial DMSP lyase activity. Seasonal increases of the bacterial DMSP biosynthesis gene (dsyB) and the bacterial DMS oxidation gene (tmm) occurred during the spring-summer and coincided with peaks in DMSP and DMSO concentration, respectively. These findings, along with significant positive relationships between dsyB gene abundance and DMSP, and tmm gene abundance with DMSO, reinforce the significant role planktonic bacteria play in producing DMSP and DMSO in ocean surface waters. Our results highlight the highly dynamic nature and myriad of microbial interactions that govern sulfur cycling in coastal shelf waters and further underpin the importance of microbial ecology in mediating important marine biogeochemical processes.]]> Mon 25 Sep 2023 08:45:56 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37507 9 kbps) were recovered from the assembled sequences. Bacteriophage diversity displayed distinct depth and regional patterns. There were clear differences in the bacteriophage populations associated with the EAC and Tasman Sea euphotic zones, at both the taxonomic and functional level. In contrast, bathypelagic phages were similar across the two oceanic regions. These data provide the first characterisation of viral diversity across a dynamic western boundary current, which is an emerging model for studying the response of microbial communities to climate change.]]> Mon 25 Jan 2021 13:21:20 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47961 Mon 22 Apr 2024 14:49:14 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40759 Mon 18 Jul 2022 13:54:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49139 Fri 05 May 2023 12:00:04 AEST ]]>