Bacterial diversity, community composition and potential activity in surface waters of the Gulf of Naples
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ABSTRACT:
PROVIDER: PRJEB14013 | ENA |
REPOSITORIES: ENA
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2018-10-19 | GSE121473 | GEO
Project description:Ammonia-oxidizing archaea (AOA) have been reported at high abundance in much of the global ocean, even in environments such as pelagic oxygen minimum zones (OMZs), where conditions seem unlikely to support aerobic ammonium oxidation. Due to the lack of information on any potential alternative metabolism of AOA, the AOA community composition might be expected to differ between oxic and anoxic environments, indicating some difference in ecology and/or physiology of the AOA assemblage. This hypothesis was tested by evaluating AOA community composition using a functional gene microarray that targets the ammonia monooxygenase gene subunit A (amoA). The relationship between environmental parameters and the biogeography of the Arabian Sea and the Eastern Tropical South Pacific (ETSP) AOA assemblages was investigated using principal component analysis (PCA) and redundancy analysis (RDA). In both the Arabian Sea and the ETSP, AOA communities within the core of the OMZ were not significantly different from those inhabiting the oxygenated surface waters above the OMZ. The AOA communities in the Arabian Sea were significantly different from those in the ETSP. In both oceans, the abundance of archaeal amoA gene in the core of the OMZ was higher than that in the surface waters. Our results indicate that AOA communities are distinguished by their geographic origin. RDA suggested that temperature was the main factor that correlated with the differences between the AOA communities from the Arabian Sea and those from the ETSP. Physicochemical properties that characterized the different environments of the OMZ and surface waters played a less important role than did geography in shaping the AOA community composition. Two-color array (Cy3 and Cy5): the universal standard 20-mer oligo is printed to the slide with a 70-mer oligo (an archetype). Environmental DNA sequences (fluoresced with Cy3) within 15% of the 70-mer conjugated to a 20-mer oligo (fluoresced with Cy5) complementary to the universal standard will bind to the oligo probes on the array. Signal is the ratio of Cy3 to Cy5. Three replicate probes were printed for each archetype. Two replicate arrays were run on duplicate targets.
2013-06-20 | E-GEOD-46851 | biostudies-arrayexpress
Project description:Ammonia-oxidizing archaeal (AOA) amoA diversity and relative abundance in Gulf of Mexico sediments (0-2 cm) were investigated using a functional gene microarray; a two color array with a universal internal standard Two color array (cy3 and cy5): the universal standard 20 bp oligo (fluoresced with cy5) is printed to the slide with a 70-mer. Environmental DNA sequences (fluoresced with Cy3) within 15% of the 70-mer will bind to it. Signal is the cy3/cy5. Up to four arrays per sample, with two biological replicates made into two targets, each run on duplicate arrays.
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Project description:The goal of the experiment was to compare the behavior and responses of a warm water diatom species in three different temperatures, low, intermediate and high, with the final aim of investigating possible intraspecific variability and better understanding the physiological plasticity and/or adaptation of diatoms to a wide range of conditions. Three different strains were used as replicates, B651,1A1,3A6. They were isolated from sea surface waters at the LTER-MC site (40°48.5’N, 14°15’E) in the Gulf of Naples on 21/08/2010, 20/12/2013 and 28/01/2014 respectively and grown in cultures. All three strains were acclimated to 13°C, 19°C and 26°C at a light intensity of 100 μmol photons m-2 sec-1 and a photoperiod of L:D, 12:12 and grown to a final concentration of 50,000 cells/ml ensuring they were still at exponential phase.
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