Vertical stratificaction of bacterial communities driven by multiple environmental factors in the dark waters off the Galician coast (NW Spain)

Dobal-Amador, V. (Vladimir); Nieto-Cid, M. (Mar); Guerrero-Feijóo, E. (Elisa); Hernando-Morales, V. (Víctor); Teira, E. (Eva); Varela, M.M. (Marta María)

doi:http://dx.doi.org/10.1016/j.dsr.2016.04.009

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Identifiers

URI: http://hdl.handle.net/10508/10609

ISSN: 0967-0637

DOI: http://dx.doi.org/10.1016/j.dsr.2016.04.009

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Date

2016-04-22

Type

article

Keywords

Bacteria
Community composition
Fluorescent in situ hybridization
Automated Ribosomal Intergenic Spacer
Analysis (ARISA)
DOM
Deep waters
NW Iberian margin

Abstract

The processesmediatedbymicrobialplanktoniccommunitiesoccuralongtheentirewatercolumn,yet the microbialactivityandcompositionhavebeenstudiedmainlyinsurfacewaters.Thisresearchex- amined theverticalvariationinbacterialabundance,activityandcommunitycompositionandstructure from surfacedownto5000mdepthfollowingalongitudinaltransectofftheGaliciancoast(NWIberian margin, from43°N, 9°W to43°N, 15°W). Communityactivityandcompositionchangedwithdepth.The leucine incorporationratesdecreasedfromtheeuphoticlayertothebathypelagicwatersbythreeorders of magnitude,whereasprokaryoticabundancedecreasedonlybyoneorderofmagnitude.Therelative abundance ofSAR11and Alteromonas, determined bycatalyzedreporteddeposition fluorescenceinsitu hybridization(CARD-FISH),decreasedwithdepth.Meanwhile,thecontributionofSAR202andSAR324 wassignificantly higherinthedeeperlayers(i.e.NEADW,NorthEastAtlanticDeepWaterandLDW, LowerDeepWater)thanintheeuphoticzone.Bacterialcommunitystructure,assessedbyAutomated Ribosomal ...

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