Carbon quantity defines productivity while its quality defines community composition of bacterioplankton in subarctic ponds

Roiha, Toni; Tiirola, Marja; Cazzanelli, Matteo; Rautio, Milla

doi:10.1007/s00027-011-0244-1

Cited by 30 publications

(24 citation statements)

References 70 publications

(75 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results are in accordance with the experiment from Breton et al (2009), which showed that bacterioplankton in thaw ponds was more carbon-limited than nutrient-limited (glucose was used as a labile carbon source). In contrast to several previous studies Säwström et al, 2007;Roiha et al, 2012), the amount of DOC did not seem to control the BP in our study. The studies that reported a positive correlation between DOC and BP were conducted in summer, when BP and DOC concentrations were highest, but without necessarily taking into account the variability in DOC type, which had a dominant role in our study.…”

Section: Thaw Pond Microbial Food Webcontrasting

confidence: 99%

Carbon dynamics in highly heterotrophic subarctic thaw ponds

Roiha

Laurion²,

Rautio

2015

Biogeosciences

View full text Add to dashboard Cite

Abstract. Global warming has accelerated the formation of permafrost thaw ponds in several subarctic and arctic regions. These ponds are net heterotrophic as evidenced by their greenhouse gas (GHG) supersaturation levels (CO 2 and CH 4 ), and generally receive large terrestrial carbon inputs from the thawing and eroding permafrost. We measured seasonal and vertical variations in the concentration and type of dissolved organic matter (DOM) in five subarctic thaw (thermokarst) ponds in northern Quebec, and explored how environmental gradients influenced heterotrophic and phototrophic biomass and productivity. Late winter DOM had low aromaticity indicating reduced inputs of terrestrial carbon, while the high concentration of dissolved organic carbon (DOC) suggests that some production of nonchromophoric dissolved compounds by the microbial food web took place under the ice cover. Summer DOM had a strong terrestrial signature, but was also characterized with significant inputs of algal-derived carbon, especially at the pond surface. During late winter, bacterial production was low (maximum of 0.8 mg C m −3 d −1 ) and was largely based on free-living bacterioplankton (58 %). Bacterial production in summer was high (up to 58 mg C m −3 d −1 ), dominated by particle-attached bacteria (67 %), and strongly correlated with the amount of terrestrial carbon. Primary production was restricted to summer surface waters due to strong light limitation deeper in the water column or in winter. The phototrophic biomass was equal to the heterotrophic biomass, but as the algae were mostly composed of mixotrophic species, most probably they used bacteria rather than solar energy in such shaded ponds. Our results point to a strong heterotrophic energy pathway in these thaw pond ecosystems, where bacterioplankton dominates the production of new carbon biomass in both summer and winter.

show abstract

Section: Thaw Pond Microbial Food Webcontrasting

confidence: 99%

Carbon dynamics in highly heterotrophic subarctic thaw ponds

Roiha

Laurion²,

Rautio

2015

Biogeosciences

View full text Add to dashboard Cite

show abstract

“…Therefore, we assume that the elevation effect in SEMs reflects not only climatic factors, such as decreasing temperature, but also the effects of conductivity and other variables, which we did not measure but which are known to covary with elevation and influence bacterial communities. One such factor is the concentration of dissolved organic carbon, which typically decreases with increasing elevation and has been identified as an essential variable for bacterial communities in subarctic lakes and ponds (Karlsson et al, ; Roiha, Tiirola, Cazzanelli, & Rautio, ). The low supply of organic carbon to high‐elevation ponds attributable to low terrestrial productivity may limit the growth of aquatic bacteria.…”

Section: Discussionmentioning

confidence: 99%

Local and geographical factors jointly drive elevational patterns in three microbial groups across subarctic ponds

Teittinen

Wang

Strömgård

et al. 2017

Global Ecol Biogeogr

View full text Add to dashboard Cite

Aim: Elevational biodiversity patterns are understudied in high-latitude aquatic systems, even though these systems are important for detecting very early impacts of climatic changes on Earth.The aim of this study was to examine the elevational trends in species richness and local contribution to beta diversity (LCBD) of three biofilm microbial groups in freshwater ponds and to identify the key mechanisms underlying these patterns.Location: One hundred and forty-six ponds in subarctic Finland and Norway distributed across the tree line along an elevational gradient of 10-1,038 m a.s.l., spanning from forested landscape to barren boulder fields.Time period: July-August 2015.Major taxa studied: Diatoms, cyanobacteria and non-cyanobacteria.Methods: Generalized linear models were used to identify the most important pond variables explaining richness and LCBD. Structural equation models were used to explore the direct and indirect effects of multiscale drivers on richness and LCBD.Results: Diatom and cyanobacteria richness showed unimodal elevational patterns, whereas noncyanobacteria richness decreased with increasing elevation. The LCBD-elevation relationship was U-shaped for all three microbial groups. Diatom and cyanobacteria richness and LCBD were best explained by local pond variables, especially by pH. Non-cyanobacteria richness and LCBD were related to pond variables, elevation as a proxy for climatic conditions, and normalized difference vegetation index as a proxy for terrestrial productivity.

show abstract

“…This enrichment may well have reflected the occurrence of heterotrophic bacteria in the water column relying on 13 C‐enriched DOM released by photosynthesising benthic algae. Since bacteria in arctic ponds are typically >1 μm in diameter (Roiha et al. , in press ), they are retained on GF/F filters and therefore contribute to the POM isotopic signal.…”

Section: Discussionmentioning

confidence: 99%

Benthic resources are the key to Daphnia middendorffiana survival in a high arctic pond

et al. 2011

Self Cite

View full text Add to dashboard Cite

Summary 1. Shallow arctic lakes and ponds have simple and short food webs, but large uncertainties remain about benthic–pelagic links in these systems. We tested whether organic matter of benthic origin supports zooplankton biomass in a pond in NE Greenland, using stable isotope analysis of carbon and nitrogen in the pond itself and in a 13C‐enrichment enclosure experiment. In the latter, we manipulated the carbon isotope signature of benthic algae to enhance its isotopic discrimination from other potential food sources for zooplankton. 2. The cladoceran Daphnia middendorffiana responded to the 13C‐enrichment of benthic mats with progressively increasing δ13C values, suggesting benthic feeding. Stable isotope analysis also pointed towards a negligible contribution of terrestrial carbon to the diet of D. middendorffiana. This agreed with the apparent dominance of autochthonous dissolved organic matter in the pond revealed by analysis of coloured dissolved organic matter. 3. Daily net production by phytoplankton in the pond (18 mg C m−2 day−1) could satisfy only up to half of the calculated minimum energy requirements of D. middendorffiana (35 mg C m−2 day−1), whereas benthic primary production alone (145 mg C m−2 day−1) was more than sufficient. 4. Our findings highlight benthic primary production as a major dietary source for D. middendorffiana in this system and suggest that benthic organic matter may play a key role in sustaining pelagic secondary production in such nutrient‐limited high arctic ponds.

show abstract

Carbon quantity defines productivity while its quality defines community composition of bacterioplankton in subarctic ponds

Cited by 30 publications

References 70 publications

Carbon dynamics in highly heterotrophic subarctic thaw ponds

Carbon dynamics in highly heterotrophic subarctic thaw ponds

Local and geographical factors jointly drive elevational patterns in three microbial groups across subarctic ponds

Benthic resources are the key to Daphnia middendorffiana survival in a high arctic pond

Contact Info

Product

Resources

About