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Statements

Subject Item
n2:RIV%2F60077344%3A_____%2F14%3A00430574%21RIV15-GA0-60077344
rdf:type
n13:Vysledek skos:Concept
dcterms:description
We employed high frequency sampling to determine the major factors modulating microbial food-web composition and dynamics through the spring phytoplankton bloom and clear-water phases in a freshwater reservoir. We examined effects of a changing trophic structure of the planktonic community cascading from the level of zooplankton, through phytoplankton composition and exudation rates to the level of growth responses and losses to grazers of phylogenetically narrow bacterial lineages. Specific probes for fluorescence in situ hybridization (FISH) revealed important short-lived peaks of genus-like (Fluviiciola sp. and Limnohabitans spp.) or even taxonomically narrower populations of Betaproteobacteria and Flavobacteria (such as FlavB and Flav2 lineages). Protozoan grazing on bacterioplankton was studied by using fluorescently labeled bacteria and by direct analyses of FISH-probe–targeted bacterial phylotypes in flagellate food vacuoles. Evaluations of selective bacterivory, growth responses, and cell biovolumes of various bacterial groups during the spring bloom indicated that certain bacterial groups such as Limnohabitans can contribute to carbon flow to the grazer food chain up to 10-fold more than similarly abundant small cells from the Ac1 lineage of Actinobacteria. During the clear-water phase, filter-feeding cladocera had dominant effects on bacterioplankton abundance and community dynamics, likely through direct grazing on larger bacteria along with altering major substrate pools (via e.g., the herbivores' sloppy feeding on algae). Fine-temporal resolution data revealed several environmental scenarios, in which the interplay of distinct top-down and bottom-up factors resulted in a competitive advantage of particular bacterial lineages. We employed high frequency sampling to determine the major factors modulating microbial food-web composition and dynamics through the spring phytoplankton bloom and clear-water phases in a freshwater reservoir. We examined effects of a changing trophic structure of the planktonic community cascading from the level of zooplankton, through phytoplankton composition and exudation rates to the level of growth responses and losses to grazers of phylogenetically narrow bacterial lineages. Specific probes for fluorescence in situ hybridization (FISH) revealed important short-lived peaks of genus-like (Fluviiciola sp. and Limnohabitans spp.) or even taxonomically narrower populations of Betaproteobacteria and Flavobacteria (such as FlavB and Flav2 lineages). Protozoan grazing on bacterioplankton was studied by using fluorescently labeled bacteria and by direct analyses of FISH-probe–targeted bacterial phylotypes in flagellate food vacuoles. Evaluations of selective bacterivory, growth responses, and cell biovolumes of various bacterial groups during the spring bloom indicated that certain bacterial groups such as Limnohabitans can contribute to carbon flow to the grazer food chain up to 10-fold more than similarly abundant small cells from the Ac1 lineage of Actinobacteria. During the clear-water phase, filter-feeding cladocera had dominant effects on bacterioplankton abundance and community dynamics, likely through direct grazing on larger bacteria along with altering major substrate pools (via e.g., the herbivores' sloppy feeding on algae). Fine-temporal resolution data revealed several environmental scenarios, in which the interplay of distinct top-down and bottom-up factors resulted in a competitive advantage of particular bacterial lineages.
dcterms:title
A finely tuned symphony of factors modulates the microbial food web of a freshwater reservoir in spring A finely tuned symphony of factors modulates the microbial food web of a freshwater reservoir in spring
skos:prefLabel
A finely tuned symphony of factors modulates the microbial food web of a freshwater reservoir in spring A finely tuned symphony of factors modulates the microbial food web of a freshwater reservoir in spring
skos:notation
RIV/60077344:_____/14:00430574!RIV15-GA0-60077344
n3:aktivita
n15:I n15:P
n3:aktivity
I, P(GA13-00243S)
n3:cisloPeriodika
5
n3:dodaniDat
n5:2015
n3:domaciTvurceVysledku
n10:9497129 n10:7264798 n10:3267253 n10:7194536 n10:6252591 n10:3190382 n10:2409135
n3:druhVysledku
n16:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
722
n3:idVysledku
RIV/60077344:_____/14:00430574
n3:jazykVysledku
n18:eng
n3:klicovaSlova
microbial food web; freshwater reservoir; limnology
n3:klicoveSlovo
n11:limnology n11:freshwater%20reservoir n11:microbial%20food%20web
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[B68E92423533]
n3:nazevZdroje
Limnology and Oceanography
n3:obor
n6:EE
n3:pocetDomacichTvurcuVysledku
7
n3:pocetTvurcuVysledku
7
n3:projekt
n4:GA13-00243S
n3:rokUplatneniVysledku
n5:2014
n3:svazekPeriodika
59
n3:tvurceVysledku
Seďa, Jaromír Kasalický, Vojtěch Nedoma, Jiří Znachor, Petr Jezbera, Jan Horňák, Karel Šimek, Karel
n3:wos
000345462100004
s:issn
0024-3590
s:numberOfPages
16
n7:doi
10.4319/lo.2014.59.5.1477