20.500.12556/DiRROS-19696 Phytoplankton across Tropical and Subtropical Regions of the Atlantic, Indian and Pacific oceans We examine the large-scale distribution patterns of the nano- and microphytoplankton collected from 145 oceanic stations, at 3 m depth, the 20% light level and the depth of the sub-surface chlorophyll maximum, during the Malaspina-2010 Expedition (December 2010-July 2011), which covered 15 biogeographical provinces across the Atlantic, Indian and Pacific oceans, between 35°N and 40°S. In general, the water column was stratified, the surface layers were nutrient-poor and the nano- and microplankton (hereafter phytoplankton, for simplicity, although it included also heterotrophic protists) community was dominated by dinoflagellates, other flagellates and coccolithophores, while the contribution of diatoms was only important in zones with shallow nutriclines such as the equatorial upwelling regions. We applied a principal component analysis to the correlation matrix among the abundances (after logarithmic transform) of the 76 most frequent taxa to synthesize the information contained in the phytoplankton data set. The main trends of variability identified consisted of: 1) A contrast between the community composition of the upper and the lower parts of the euphotic zone, expressed respectively by positive or negative scores of the first principal component, which was positively correlated with taxa such as the dinoflagellates Oxytoxum minutum and Scrippsiella spp., and the coccolithophores Discosphaera tubifera and Syracosphaera pulchra (HOL and HET), and negatively correlated with taxa like Ophia-ster hydroideus (coccolithophore) and several diatoms, 2) a general abundance gradient between phytoplankton-rich regions with high abundances of dinoflagellate, coccolitho-phore and ciliate taxa, and phytoplankton-poor regions (second principal component), 3) differences in dominant phytoplankton and ciliate taxa among the Atlantic, the Indian and the Pacific oceans (third principal component) and 4) the occurrence of a diatom-dominated assemblage (the fourth principal component assemblage), including several pennate taxa, Planktoniella sol, Hemiaulus hauckii and Pseudo-nitzschia spp., in the divergence regions. sea phytoplankton research programmes ocean expeditions Malaspina 2010 distribution ocean sampling Atlantic Ocean Pacific Indian Ocean morje plankton raziskovanje morja fitoplankton oceanske ekspedicije biološka oceanografija Plos One true false true Angleški jezik Slovenski jezik Neznano 2024-07-24 03:45:28 2024-07-25 17:26:46 2024-07-26 04:28:12 0000-00-00 00:00:00 2016 0 0 Nasl. z nasl. zaslona; Opis vira z dne 18. 3. 2016; str. 1-29 iss. 3 Vol. 11 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2016-03-16 574 1932-6203 10.1371/journal.pone.0151699 3816527 http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0151699#pone-0151699-g001 1 bb78dd54-494d-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=27228 RAZ_Estrada_Marta_2016.pdf RAZ_Estrada_Marta_2016.pdf 1 90D915B49A93BD9447C56CAB6AE69442 8c642f031b05a84ca498e5980ab25127b1b8d8c8b2535aeac2b95b9545181654 c8146ca2-4a89-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=27538 Nacionalni inštitut za biologijo 0 0 0