PMC:5003436 / 17117-19796
Annnotations
{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/5003436","sourcedb":"PMC","sourceid":"5003436","source_url":"https://www.ncbi.nlm.nih.gov/pmc/5003436","text":"3.1. Species Composition during Sampling Period Based on Cell Counts\nThe samples were characterized by a mixed assembly of species (Table S1) and dominated mainly by diatoms and cryptomonads (Table 3). Dominant taxa in the five samples were Chaetoceros spp., Cryptomonadales, Asterionellopsis glacialis and Cylindrotheca closterium. The last sample (6A) by the end of October showed also a bloom of Nitzschia spp. With respect to potentially toxic algae (Table 4, Table S1), it was possible to observe several developments of Pseudo-nitzschia species. Based on morphological characteristics of the valves and on previous distinctions made by other authors [21,22], species of Pseudo-nitzschia were grouped and counted using four identification groups: the “slender” (seriata complex, i.e., P. multiseries + pungens), the “thin” (valve \u003c 3 µm, delicatissima complex, i.e., P. calliantha + delicatissima + pseudodelicatissima), the “wide” (valve \u003e 3 µm, seriata complex, i.e., P. australis + fraudulenta + seriata + subpacifica), and the “sigmoid” (P. multistriata). The sigmoid group was observed with low abundances in August (sample 3A, 400 cells·L−1) and higher abundances in October (samples 4A and 6A) with a maximum of 40,600 cells·L−1 in the last sample. In July (sample 1A), it was possible to observe a high concentration of the “wide” Pseudo-nitzschia (P. australis, fraudulenta, seriata, and subpacifica) with 30,200 cells·L−1, as well as 2 cells of Alexandrium spp.. At the beginning of August (sample 2A) and the beginning of October (sample 4A), species of Prorocentrum (P. cf. minimum, balticum, and cordatum) were detected with 400 cells·L−1. Furthermore, 7,000 cells·L−1 of Pseudo-nitzschia (mainly from the “thin” group) were observed in sample 2A. Except for the aforementioned Pseudo-nitzschia multistriata (400 cells·L−1), no potentially toxic species were observed at the end of August (sample 3A). In both October samples (4A and 6A), it was possible to identify Heterosigma akashiwo with 600 and 400 cells·L−1, respectively. In the late October sample (6A), 30 cells·L−1 of Dinophysis caudata were also counted.\nDespite few events of potentially toxic algae blooms during our study period, we can point out the presence of five genera in our samples (Pseudo-nitzschia, Heterosigma, Prorocentrum, Alexandrium, and Dinophysis) that are all represented by probes on the MIDTAL microarray.\nmicroarrays-02-00001-t003_Table 3 Table 3 Non-toxic cells in high abundance at the Arcachon site over the sampling period in cells·L−1.\nmicroarrays-02-00001-t004_Table 4 Table 4 Cell counts of potentially harmful cells at the Arcachon site over the sampling period.\n\n3","divisions":[{"label":"Title","span":{"begin":0,"end":68}},{"label":"Table caption","span":{"begin":2409,"end":2547}},{"label":"Table caption","span":{"begin":2546,"end":2678}}],"tracks":[]}