title: Oceanic fronts: transition zones for bacterioplankton community composition.
abstract: Oceanic fronts are widespread mesoscale features that exist in the boundary between different water masses. Despite the recognized importance of bacterioplankton (including bacteria and archaea) on the marine biogeochemical cycles and the ubiquitousness of fronts, the effect of frontal zones on the distribution of bacterioplankton community remains unknown. Using 16S rRNA gene sequencing coupled with a high spatial resolution analysis of the physical properties of the water masses, we demonstrate strong shifts in bacterioplankton community composition (BCC) across the subtropical frontal zone off New Zealand. The transition between water masses resulted in a clear modification of the dominant taxa and a significant increase in community dissimilarity. Our results, linking physical oceanography and marine molecular ecology, support the strong role of oceanic frontal zones in delimiting the distribution of bacterioplankton in the ocean.
authors.affiliation: Department of Marine Science, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.|NIWA/University of Otago Research Centre for Oceanography, PO Box 56, Dunedin, 9054, New Zealand.
authors.forename: Federico
authors.identifier: http://orcid.org/0000-0001-8907-1494
authors.initials: F
authors.lastname: Baltar
authors.affiliation: Department of Chemistry, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.|NIWA/University of Otago Research Centre for Oceanography, PO Box 56, Dunedin, 9054, New Zealand.
authors.forename: Kim
authors.initials: K
authors.lastname: Currie
authors.affiliation: Department of Marine Science, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.
authors.forename: Esther
authors.initials: E
authors.lastname: Stuck
authors.affiliation: Department of Microbiology and Immunology, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Roosa
authors.affiliation: Department of Microbiology and Immunology, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.
authors.forename: Sergio E
authors.initials: SE
authors.lastname: Morales
mesh_terms: D001105:Archaea / Q000145:classification* / Q000235:genetics*; D001419:Bacteria / Q000145:classification* / Q000235:genetics*; D058448:Biota; D055598:Chemical Phenomena; D016000:Cluster Analysis; D019641:DNA, Archaeal / Q000737:chemistry / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D009520:New Zealand; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000737:chemistry* / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D062206:Spatial Analysis
chemical_list: D019641:DNA, Archaeal; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S