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

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

handle: 10261/316672 , 10508/10609

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

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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 IntergenicSpacerAnalysis(ARISA),wasdepth-specific. Adistancebasedlinearmodel (DistLM) revealedthatthevariabilityfoundinbacterialcommunitystructurewasmainlyexplainedby temperaturenitrate,phosphate,dissolvedorganicmatter(DOM) fluorescence, prokaryoticabundance, leucine incorporationandtoalesserextentsalinity,oxygen,CDOMabsorbanceanddissolvedorganic carbon concentration.Ourresultsdisplayedabacterialcommunitystructureshapednotonlybydepth- relatedphysicochemicalfeaturesbutalsobyDOMquality,indicatingthatdifferentprokaryotictaxahave the potentialtometabolizeparticularDOMsources.

scientific article

SI

Country

Spain

Related Organizations

Spanish National Research Council
Spain
Spanish Institute of Oceanography
Spain

Keywords

Bacteria, NW Iberian margin, Analysis (ARISA), Community composition, Medio Marino, DOM, Centro Oceanográfico de A Coruña, Fluorescent in situ hybridization, Automated Ribosomal Intergenic Spacer, Deep waters

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