Bacterial and Phytoplankton Responses to Nutrient Amendments in a Boreal Lake Differ According to Season and to Taxonomic Resolution

Peura, Sari; Eiler, Alexander; Hiltunen, Minna; Nykänen, Hannu; Tiirola, Marja; Jones, Roger

doi:10.1371/journal.pone.0038552

Cited by 24 publications

(24 citation statements)

References 67 publications

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“…() showed that distinct microbial communities developed on cellulose sponges amended with different nutrients. Research on bacterioplankton in a Finnish boreal lake also revealed clear differences in community composition between nutrient treatments but the treatment effects were seasonally dependent (Peura et al ., ). Our findings, together with those of Hoellein et al .…”

Section: Discussionmentioning

confidence: 85%

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Nitrogen limitation of heterotrophic biofilms in boreal streams

et al. 2015

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Summary Nutrient limitation of the biofilm is fundamental to stream ecosystem processes, as microbial activity shapes the biological availability and biogeochemical cycling of carbon and nutrients. We used nutrient‐diffusing substrata (NDS) to investigate heterotrophic nutrient limitation of microbial respiration (MR) across 20 streams draining boreal landscapes in northern Sweden. We also explored variation in microbial biomass and community structure of biofilms that developed on NDS using phospholipid fatty acid (PLFA) biomarkers. Limitation was determined as a significant response of MR and biomass production on cellulose surfaces to enrichment with nitrogen (N), phosphorus (P) or N + P, relative to controls. Microbial respiration was N‐limited, with an average 3.3‐fold increase on N‐amended NDS. Nitrogen limitation decreased, and control rates of MR increased, with greater background concentrations of inorganic N across the sites. In contrast to MR, microbial biomass was primarily N‐limited but was greatest for the N + P NDS. Accordingly, differences in respiratory versus biomass responses to nutrient addition resulted in significantly greater biomass‐specific MR on N‐amended NDS compared to all other treatments. In addition, PLFA biomarkers indicated distinct microbial communities on N and N + P NDS compared to controls and/or P NDS. Greater MR and biomass, and the development of distinct microbial communities, when supplied with inorganic N suggest that factors which alter aquatic N loading during autumn may have important implications for ecosystem processes and the biogeochemistry of boreal streams and rivers. Our findings add to a growing body of evidence that the productivity of Fennoscandian boreal landscapes is constrained by N availability.

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Section: Discussionmentioning

confidence: 85%

“…() and Peura et al . (), highlight the need for research investigating not only seasonal changes in the composition of microbial biofilms but also the role different microbial groups may play in acquiring limiting nutrients.…”

Section: Discussionmentioning

confidence: 94%

Nitrogen limitation of heterotrophic biofilms in boreal streams

et al. 2015

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“…Pelagic GAM can quickly dominate microbial assemblages after nutrient additions and/or removal of grazers (Eilers et al ., ). They were enriched in nutrient additions in autumn, but not during spring or summer in eutrophic Lake Mendota (Newton and McMahon, ), and only at times of lowest phytoplankton biomass in a boreal lake (Peura et al ., ). Aeromonas hydrophila (Gammaproteobacteria) , known for its chitinolytic activity (Jagmann et al ., ), was readily enriched in freshwater microcosms amended with algal‐derived particles, but lost in direct competition assays against a strain affiliated with CF (Styp von Rekowski et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…quickly respond to nutrient amendments, esp. phosphorus (Šimek et al ., ; Pérez and Sommaruga, ; Peura et al ., ) and are versatile in their incorporation of low molecular weight substrates (Salcher et al ., ). In our study, Limnohabitans spp.…”

Section: Discussionmentioning

confidence: 99%

Seasonal growth potential of rare lake water bacteria suggest their disproportional contribution to carbon fluxes

Neuenschwander

Pernthaler

Posch

et al. 2014

Environmental Microbiology

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We studied the seasonal growth potential of opportunistic bacterial populations in Lake Zurich (Switzerland) by a series of grazer-free dilution culture assays. Pronounced shifts in the composition of the bacterial assemblages were observed within one doubling of total cell numbers, from initially abundant Actinobacteria to other fast-growing microbial lineages. Small populations with growth potentials far above community average were detected throughout the year with striking seasonal differences in their respective taxonomic affiliations. Members of Cytophaga-Flavobacteria (CF) were disproportionally proliferating only during phytoplankton blooms in spring and summer, while Beta-and Gammaproteobacteria showed superior growth at all other occasions. Growth rates of Alphaproteobacteria and esp. Sphingomonadaceae were significantly correlated to water temperatures and were far above community average in summer. Within the genus Flavobacterium, two species-like populations showed a tendency for fast growth in most experiments, while four others were exclusively proliferating either during a spring or during a summer phytoplankton bloom. Their high growth potentials but low in situ abundances hint at a tight control by bacterivorous grazers and at a consequently accelerated carbon flux to higher trophic levels.

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“…Previous studies have focused on demonstrating how factors of direct trophic control such as predation (Pernthaler ) or resource competition (Peura et al. , de Vries and Shade ) have selective community‐level effects on bacterial diversity.…”

Section: Introductionmentioning

confidence: 99%

Bacterial community response to changes in a tri‐trophic cascade during a whole‐lake fish manipulation

Saarenheimo¹,

Aalto²,

Syväranta³

et al. 2016

Ecology

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Microbial communities play a key role in biogeochemical processes by degrading organic material and recycling nutrients, but can also be important food sources for upper trophic levels. Trophic cascades might modify microbial communities either directly via grazing or indirectly by inducing changes in other biotic or in abiotic factors (e.g., nutrients). We studied the effects of a tri‐trophic cascade on microbial communities during a whole‐lake manipulation in which European perch (Perca fluviatilis) were added to a naturally fishless lake divided experimentally into two basins. We measured environmental parameters (oxygen, temperature, and nutrients) and zooplankton biomass and studied the changes in the bacterial community using next generation sequencing of 16S rRNA genes and cell counting. Introduction of fish reduced the biomass of zooplankton, mainly Daphnia, which partly altered the bacterial community composition and affected the bacterial cell abundances. However, the microbial community composition was mainly governed by stratification patterns and associated vertical oxygen concentration. Slowly growing green sulfur bacteria (Chlorobium) dominated the anoxic water layers together with bacteria of the candidate division OD1. We conclude that alterations in trophic interactions can affect microbial abundance, but that abiotic factors seem to be more significant controls of microbial community composition in sheltered boreal lakes.

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Bacterial and Phytoplankton Responses to Nutrient Amendments in a Boreal Lake Differ According to Season and to Taxonomic Resolution

Cited by 24 publications

References 67 publications

Nitrogen limitation of heterotrophic biofilms in boreal streams

Nitrogen limitation of heterotrophic biofilms in boreal streams

Seasonal growth potential of rare lake water bacteria suggest their disproportional contribution to carbon fluxes

Bacterial community response to changes in a tri‐trophic cascade during a whole‐lake fish manipulation

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