https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39166 Tue 14 Nov 2023 12:24:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36576 Tue 09 Jun 2020 11:40:47 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:53388 Thu 23 Nov 2023 13:29:44 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40759 Mon 18 Jul 2022 13:54:19 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:45454 Fri 28 Oct 2022 14:15:26 AEDT ]]>