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)Date
2016-04-22Type
research articleKeywords
BacteriaCommunity 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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