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Hillebrand, H., Langenheder, S., Lebret, K., Lindström, E. S., Östman, Ö. & Striebel, M. (2018). Decomposing multiple dimensions of stability in global change experiments. Ecology Letters, 21(1), 21-30
Open this publication in new window or tab >>Decomposing multiple dimensions of stability in global change experiments
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2018 (English)In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 21, no 1, p. 21-30Article in journal (Refereed) Published
Abstract [en]

Ecological stability is the central framework to understand an ecosystem's ability to absorb or recover from environmental change. Recent modelling and conceptual work suggests that stability is a multidimensional construct comprising different response aspects. Using two freshwater mesocosm experiments as case studies, we show how the response to single perturbations can be decomposed in different stability aspects (resistance, resilience, recovery, temporal stability) for both ecosystem functions and community composition. We find that extended community recovery is tightly connected to a nearly complete recovery of the function (biomass production), whereas systems with incomplete recovery of the species composition ranged widely in their biomass compared to controls. Moreover, recovery was most complete when either resistance or resilience was high, the latter associated with low temporal stability around the recovery trend. In summary, no single aspect of stability was sufficient to reflect the overall stability of the system.

Keywords
Biodiversity, Biomass, Composition, Ecosystem functions, Fluctuations, Recovery, Resilience, Resistance
National Category
Earth and Related Environmental Sciences Biological Sciences
Identifiers
urn:nbn:se:uu:diva-334881 (URN)10.1111/ele.12867 (DOI)000418133700003 ()29106075 (PubMedID)
Funder
Swedish Research Council Formas, 226-2012-1827
Available from: 2017-11-29 Created: 2017-11-29 Last updated: 2018-01-17Bibliographically approved
Svoboda, P., Lindström, E. S., Osman, O. A. & Langenheder, S. (2018). Dispersal timing determines the importance of priority effects in bacterial communities. The ISME Journal, 12(2), 644-646
Open this publication in new window or tab >>Dispersal timing determines the importance of priority effects in bacterial communities
2018 (English)In: The ISME Journal, ISSN 1751-7362, E-ISSN 1751-7370, Vol. 12, no 2, p. 644-646Article in journal (Refereed) Published
Abstract [en]

The order and timing of species arrival during community assembly can have long term effects on community structure due to priority effects. The importance of such processes in complex bacterial communities where dispersal involves mixing of entire communities is currently not known. Here we used a transplant experiment with two bacterioplankton communities of different origin (freshwater and brackish). Sterile medium of each origin was initially inoculated with a bacterial community of different ('alien') origin, followed by dispersal of the respective 'home' community at different time points after initial inoculation. We found that the later the dispersal with the 'home' community occurred the smaller the effect on the final community composition. This suggests that priority effects by the initially inoculated community reduce the establishment success of taxa from the later arriving community and that this effect depends on dispersal timing.

National Category
Microbiology
Identifiers
urn:nbn:se:uu:diva-343666 (URN)10.1038/ismej.2017.180 (DOI)000422779100031 ()29053147 (PubMedID)
Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-03-07Bibliographically approved
Lindström, E. S. (2018). High abundances of Gonyostomum semen in brown water lakes are associated with high concentrations of iron: Fluorescence and abosrbance data.
Open this publication in new window or tab >>High abundances of Gonyostomum semen in brown water lakes are associated with high concentrations of iron: Fluorescence and abosrbance data
2018 (English)Data set, Primary data
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-341683 (URN)
Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-09-19Bibliographically approved
Lebret, K., Östman, Ö., Langenheder, S., Drakare, S., Guillemette, F. & Lindström, E. S. (2018). High abundances of the nuisance raphidophyte Gonyostomum semen in brown water lakes are associated with high concentrations of iron. Scientific Reports, 8(1), Article ID 13463.
Open this publication in new window or tab >>High abundances of the nuisance raphidophyte Gonyostomum semen in brown water lakes are associated with high concentrations of iron
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, no 1, article id 13463Article in journal (Refereed) Published
Abstract [en]

Algal blooms occur frequently in lakes and oceans and the causes and consequences of those are often studied. In this study, we focus on a less well known type of algal bloom by the freshwater raphidophyte Gonyostomum semen. This species’ abundance and occurrence is increasing, especially in brown water lakes, the most abundant lake type in the boreal zone. The aim of the study was to investigate which environmental factors are associated with G. semen by statistical evaluation of field data of 95 Swedish lakes over five years. Although we found G. semen to be associated with dark waters it was, contrary to our expectations, mainly high concentrations of iron, and only to a lesser extent high TOC (total organic carbon) concentrations, that were associated with blooms of G. semen. In addition, high phosphorus concentrations and low pH also appear to facilitate G. semen blooms. We suggest that browning of lakes caused by increased iron concentrations may decrease net heterotrophy by fostering heavy algal blooms, i.e. the opposite to commonly assumed effects of increased DOM (dissolved organic matter).

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-360865 (URN)10.1038/s41598-018-31892-7 (DOI)
Funder
Swedish Research Council Formas, 226-2012-1827Swedish Research Council, 637-2014-6821
Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved
Lebret, K., Langenheder, S., Colinas, N., Östman, Ö. & Lindström, E. (2018). Increased water colour affects freshwater plankton communities in a mesocosm study. Aquatic Microbial Ecology, 81(1), 1-17
Open this publication in new window or tab >>Increased water colour affects freshwater plankton communities in a mesocosm study
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2018 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 81, no 1, p. 1-17Article in journal (Refereed) Published
Abstract [en]

Increases in water colour (brownification) have been observed in aquatic systems in the Northern Hemisphere, partly caused by increased loading of organic carbon from terrestrial origins. We investigated the effect of increase in water colour on the composition, structure and function of lake plankton communities (bacteria, phytoplankton and zooplankton) conducting a mesocosm experiment in 3 medium-coloured lakes (average absorbance at 420 nm: 0.034 cm(-1)), with different nutrient concentrations and phytoplankton community composition. To simulate an increase in water colour, we added humic substances (HuminFeed) at 3 different concentrations. The additions significantly affected the water colour of the mesocosms, but had no measurable effect on total organic carbon concentration, thus change in light conditions was the main effect of our treatment on the plankton communities. The increase in water colour did not significantly affect the measured functions (productivity, respiration) and biomass of the plankton communities (bacteria, phytoplankton and zooplankton), but led to changes in the relative abundance of some phytoplankton taxa and, to a lesser extent, the bacterial community (differences in relative abundance). The treatments had no significant effect on zooplankton biomass or composition. Our study suggests that increases in water colour favour low-light-adapted phytoplankton species, which in turn also can affect bacterial composition, whereas the change in light climate had no clear impact on the functioning of plankton communities in weakly humic lakes.

Keywords
Light climate, Plankton community, Lake, Bacteria, Phytoplankton
National Category
Ecology Oceanography, Hydrology and Water Resources
Research subject
Biology with specialization in Limnology
Identifiers
urn:nbn:se:uu:diva-343400 (URN)10.3354/ame01858 (DOI)000427677800001 ()
Funder
Swedish Research Council Formas, 226-2012-1827
Available from: 2018-02-27 Created: 2018-02-27 Last updated: 2018-05-18Bibliographically approved
Sjöstedt, J., Langenheder, S., Kritzberg, E., Karlsson, C. M. G. & Lindström, E. S. (2018). Repeated disturbances affect functional but not compositional resistance and resilience in an aquatic bacterioplankton community. Environmental Microbiology Reports, 10(4), 493-500
Open this publication in new window or tab >>Repeated disturbances affect functional but not compositional resistance and resilience in an aquatic bacterioplankton community
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2018 (English)In: Environmental Microbiology Reports, ISSN 1758-2229, E-ISSN 1758-2229, Vol. 10, no 4, p. 493-500Article in journal (Refereed) Published
Abstract [en]

Disturbances are believed to be one of the main factors influencing variations in community diversity and functioning. Here we investigated if exposure to a pH press disturbance affected the composition and functional performance of a bacterial community and its resistance, recovery and resilience to a second press disturbance (salt addition). Lake bacterial assemblages were initially exposed to reduced pH in six mesocosms whereas another six mesocosms were kept as reference. Seven days after the pH disturbance, three tanks from each treatment were exposed to a salt disturbance. Both bacterial production and enzyme activity were negatively affected by the salt treatment, regardless if the communities had been subject to a previous disturbance or not. However, cell-specific enzyme activity had a higher resistance in communities pre-exposed to the pH disturbance compared to the reference treatment. In contrast, for cell-specific bacterial production resistance was not affected, but recovery was faster in the communities that had previously been exposed to the pH disturbance. Over time, bacterial community composition diverged among treatments, in response to both pH and salinity. The difference in functional recovery, resilience and resistance may depend on differences in community composition caused by the pH disturbance, niche breadth or acquired stress resistance.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-360866 (URN)10.1111/1758-2229.12656 (DOI)
Funder
Carl Tryggers foundation , CTS 13:432Stiftelsen Olle Engkvist Byggmästare, 2013/512
Available from: 2018-09-19 Created: 2018-09-19 Last updated: 2018-09-19Bibliographically approved
Onuţ-Brännström, I., Benjamin, M., Scofield, D. G., Starri, H., Andersson, M. G. .., Lindström, E. S. & Johannesson, H. (2018). Sharing of photobionts in sympatric populations of Thamnolia and Cetraria lichens: evidence from high-throughput sequencing. Scientific Reports, 8, Article ID 4406.
Open this publication in new window or tab >>Sharing of photobionts in sympatric populations of Thamnolia and Cetraria lichens: evidence from high-throughput sequencing
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 4406Article in journal (Refereed) Published
Abstract [en]

In this study, we explored the diversity of green algal symbionts (photobionts) in sympatric populations of the cosmopolitan lichen-forming fungi Thamnolia and Cetraria. We sequenced with both Sanger and Ion Torrent High-Throughput Sequencing technologies the photobiont ITS-region of 30 lichen thalli from two islands: Iceland and Öland. While Sanger recovered just one photobiont genotype from each thallus, the Ion Torrent data recovered 10–18 OTUs for each pool of 5 lichen thalli, suggesting that individual lichens can contain heterogeneous photobiont populations. Both methods showed evidence for photobiont sharing between Thamnolia and Cetraria on Iceland. In contrast, our data suggest that on Öland the two mycobionts associate with distinct photobiont communities, with few shared OTUs revealed by Ion Torrent sequencing. Furthermore, by comparing our sequences with public data, we identified closely related photobionts from geographically distant localities. Taken together, we suggest that the photobiont composition in Thamnolia and Cetraria results from both photobiont-mycobiont codispersal and local acquisition during mycobiont establishment and/or lichen growth. We hypothesize that this is a successful strategy for lichens to be flexible in the use of the most adapted photobiont for the environment.

National Category
Ecology Evolutionary Biology
Identifiers
urn:nbn:se:uu:diva-319634 (URN)10.1038/s41598-018-22470-y (DOI)000427241500007 ()
Funder
Swedish National Infrastructure for Computing (SNIC), b2013277The Royal Swedish Academy of SciencesHelge Ax:son Johnsons stiftelse Lars Hierta Memorial FoundationSwedish National Infrastructure for Computing (SNIC), b2013277
Note

Title in thesis list of papers: Differential sharing of photobionts in sympatric populations of Thamnolia and Cetraria lichens: evidence from next generation sequencing

Available from: 2017-04-06 Created: 2017-04-06 Last updated: 2018-05-31Bibliographically approved
Comte, J., Berga, M., Severin, I., Logue, J. B. & Lindström, E. S. (2017). Contribution of different bacterial dispersal sources to lakes: Population and community effects in different seasons. Environmental Microbiology, 19(6), 2391-2404
Open this publication in new window or tab >>Contribution of different bacterial dispersal sources to lakes: Population and community effects in different seasons
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2017 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 19, no 6, p. 2391-2404Article in journal (Refereed) Published
Abstract [en]

The diversity and composition of lake bacterial communities are driven by the interplay between local contemporary environmental conditions and dispersal of cells from the surroundings, i.e. the metacommunity. Still, a conceptual understanding ofthe relative importance of the two types of factors is lacking. For instance, it is unknown which sources ofdispersal are most important and under which circumstances. Here, we investigated the seasonal variation in the importance of dispersal from different sources (mixing, precipitation, surface runoff and sediment resuspension) for lake bacterioplankton community and population dynamics. For that purpose, two small forest lakes and their dispersal sources were sampled over a period of 10 months.The influence of dispersal on communities and populations was determined by 454 sequencing of the 16S rRNA gene and Source Tracker analysis. On the community level direct effects of dispersal were questionable from all sources. Instead we found that the community of the preceding sampling occasion, representing growth of resident bacteria, was of great importance. On the population level, however, dispersal of individual taxa from the inlet could be occasionally important even under low water flow. The effect of sediment resuspension and precipitation appeared small.

National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:uu:diva-323624 (URN)10.1111/1462-2920.13749 (DOI)000404007700024 ()28401636 (PubMedID)
Funder
Swedish Research Council, 2009-5172Wenner-Gren FoundationsCarl Tryggers foundation Knut and Alice Wallenberg FoundationScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish National Infrastructure for Computing (SNIC), b2010008
Available from: 2017-06-08 Created: 2017-06-08 Last updated: 2018-01-13Bibliographically approved
Comte, J., Langenheder, S., Berga, M. & Lindström, E. S. (2017). Contribution of different dispersal sources to the metabolic response of lake bacterioplankton following a salinity change. Environmental Microbiology, 19(1), 251-260
Open this publication in new window or tab >>Contribution of different dispersal sources to the metabolic response of lake bacterioplankton following a salinity change
2017 (English)In: Environmental Microbiology, ISSN 1462-2912, E-ISSN 1462-2920, Vol. 19, no 1, p. 251-260Article in journal (Refereed) Published
Abstract [en]

Dispersal can modify how bacterial community composition (BCC) changes in response to environmental perturbations, yet knowledge about the functional consequences of dispersal is limited. Here we hypothesize that changes in bacterial community production in response to a salinity disturbance depend on the possibility to recruit cells from different dispersal sources. To investigate this, we conducted an in situ mesocosm experiment where bacterial communities of an oligotrophic lake were exposed to different salinities (0, 18, 36 psu) for two weeks and subjected to dispersal of cells originating from sediments, air (mesocosms open to air deposition), both or none. BCC was determined using 454 pyrosequencing of the 16S rRNA gene and bacterial production was measured by 3H leucine uptake. Bacterial production differed significantly among salinity treatments and dispersal treatments, being highest at high salinity. These changes were associated with changes in BCC and it was found that the identity of the main functional contributors differed at different salinities. Our results further showed that after a salinity perturbation, the response of bacterial communities depended on the recruitment of taxa, including marine representatives (e.g. Alphaproteobacteria Loktanella, Erythrobacter and the Gammaproteobacterium Rheiheimera) from dispersal sources, in which atmospheric deposition appeared to play a major role.

National Category
Microbiology Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:uu:diva-309470 (URN)10.1111/1462-2920.13593 (DOI)000393587200028 ()27871136 (PubMedID)
Funder
Knut and Alice Wallenberg FoundationScience for Life Laboratory - a national resource center for high-throughput molecular bioscienceWenner-Gren FoundationsHelge Ax:son Johnsons stiftelse Swedish Research Council, 2009-5172Swedish Research Council Formas
Available from: 2016-12-05 Created: 2016-12-05 Last updated: 2018-01-13Bibliographically approved
Lindström, E. S. & Andersson, M. (2017). Effects of sterilization on composition and bacterial utilization of dissolved organic carbon.
Open this publication in new window or tab >>Effects of sterilization on composition and bacterial utilization of dissolved organic carbon
2017 (English)Data set, Primary data
National Category
Ecology
Research subject
Biology with specialization in Limnology
Identifiers
urn:nbn:se:uu:diva-342359 (URN)
Available from: 2018-02-20 Created: 2018-02-20 Last updated: 2018-02-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-8920-3071

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